Relevant bibliographies by topics / Pt-free

Academic literature on the topic 'Pt-free'

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Published: 6 September 2023

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Journal articles on the topic "Pt-free"

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Heo, Pilwon, Hidetaka Shibata, Masahiro Nagao, and Takashi Hibino. "Pt-free intermediate-temperature fuel cells." Solid State Ionics 179, no. 27-32 (September 30, 2008): 1446–49. http://dx.doi.org/10.1016/j.ssi.2007.12.090.

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CLACENS, J. "Pt-free sulphur resistant NOx traps." Applied Catalysis B: Environmental 53, no. 1 (October 2004): 21–27. http://dx.doi.org/10.1016/j.apcatb.2004.04.014.

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Nie, Yao, Li Li, and Zidong Wei. "Recent advancements in Pt and Pt-free catalysts for oxygen reduction reaction." Chemical Society Reviews 44, no. 8 (2015): 2168–201. http://dx.doi.org/10.1039/c4cs00484a.

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Thompson, Eric L., and Daniel Baker. "Proton Conduction on Ionomer-Free Pt Surfaces." ECS Transactions 41, no. 1 (December 16, 2019): 709–20. http://dx.doi.org/10.1149/1.3635605.

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Favaron, O., and J. L. Fouquet. "On m-centers in Pt-free graphs." Discrete Mathematics 125, no. 1-3 (February 1994): 147–52. http://dx.doi.org/10.1016/0012-365x(94)90155-4.

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Meng, Hui, and Pei Kang Shen. "Novel Pt-free catalyst for oxygen electroreduction." Electrochemistry Communications 8, no. 4 (April 2006): 588–94. http://dx.doi.org/10.1016/j.elecom.2006.01.020.

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Deng, Yibo, Xiaoguang Xu, Zedong Xu, Mengxi Wang, Qi Liu, Yingli Ma, Jikun Chen, et al. "Self-rectifying and forming-free resistive switching behaviors in Pt/La2Ti2O7/Pt structure." Ceramics International 48, no. 4 (February 2022): 4693–98. http://dx.doi.org/10.1016/j.ceramint.2021.11.005.

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Almarjan, Lulu, Deni Muhammad Danial, and Dicky Jhoansyah. "Pengaruh Free Cash Flow terhadap Kebijakan Hutang." BUDGETING : Journal of Business, Management and Accounting 1, no. 2 (June 26, 2020): 163–69. http://dx.doi.org/10.31539/budgeting.v1i2.807.

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This study aims to determine how much influence the free cash flow on debt policy at PT Indofood Sukses Makmur Tbk. The method used in this research is descriptive and associative methods with quantitative approaches. The data used is PT Indofood's annual financial statement data for 8 years from 2011 to 2018. The statistical test used is calculation, analysis using simple linear regression including the coefficient of determination test. The results showed that the free cash flow variable gained a significance value of 0.008, which means that there was an influence of free cash flow on the corporate debt policy of PT Indofood Sukses Makmur Tbk. Conclusion, there is a significant influence and strong relationship with the positive direction of the variable free cash flow (free cash flow) on the debt policy at PT Indofood Sukses Makmur Tbk. Keywords: Free Cash Flow, Debt Policy
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Dominici, C., F. Petrucci, S. Caroli, A. Alimonti, A. Clerico, and M. A. Castello. "A pharmacokinetic study of high-dose continuous infusion cisplatin in children with solid tumors." Journal of Clinical Oncology 7, no. 1 (January 1989): 100–107. http://dx.doi.org/10.1200/jco.1989.7.1.100.

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The pharmacokinetics of cisplatin were investigated in 14 patients, aged 10 months through 13 years who were affected by solid malignant tumors. High-dose cisplatin (40 mg/m2/d) was administered with repeated courses for five days as a continuous intravenous (IV) infusion. Total platinum (Pt) levels in plasma and urine and free (protein-unbound) Pt levels in plasma ultrafiltrate were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Areas under the concentration v time curve (AUCs) for mean total and free Pt levels were calculated for the 120-hour period of infusion and for the 384 and 120 hours following its completion, respectively. Half-lives of total and free Pt in plasma were calculated for the 216 hours following completion of infusion in five patients at their first course. The fraction of the administered Pt dose excreted in urine as Pt was determined for the five-day period of infusion and seven-day period after its completion. A total of 36 courses were studied. Maximum average Pt levels were reached after 120 hours of infusion: at the first course, 3.22 and 0.17 micrograms/mL for total and free Pt, respectively. Platinum levels declined according to a biexponential model, with initial half-lives of 18.3 and 16.9 minutes, and terminal half-lives of 81.9 and 59.0 hours as determined for total and free Pt, respectively. In the second and third courses studied there was a progressive increase in mean Pt plasma levels. Consequently, the free drug exposure as measured by AUC increased in all patients with repeated courses: 47.7% for the second and 124.4% for the third course, when compared with the first. At the same time, the mean fraction of the dose excreted in the urine for the 12-day period considered, was 44.1% for the first course, 36.2% for the second, and 28.4% for the third. The progressive enhancement of tissue exposure to the free cytotoxic drug, resulting from a reduced renal clearance of Pt with sequential courses of cisplatin, produced mainly increased toxicity while therapeutic effect progressively diminished.
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Ye, Heng, Guofeng Ma, Jian Kang, Hongqi Sun, and Shaobin Wang. "Pt-Free microengines at extremely low peroxide levels." Chemical Communications 54, no. 37 (2018): 4653–56. http://dx.doi.org/10.1039/c8cc01548a.

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Dissertations / Theses on the topic "Pt-free"

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Eckardt, Markus [Verfasser]. "ORR activity and stability of Pt-based and Pt-free catalysts for PEMFC applications / Markus Eckardt." Ulm : Universität Ulm, 2020. http://d-nb.info/1203716257/34.

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Marzorati, S. "PT-FREE NANO- AND MICRO-STRUCTURED CARBONS FOR ELECTROCHEMICAL OXYGEN REDUCTION REACTION." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/332529.

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Oxygen reduction reaction (ORR) catalysts are of crucial importance in developing low- and medium-temperature fuel cells, as PEMFCs (Polymer Electrolyte Membrane Fuel Cells), from which sizeable energy saving and reduction of greenhouse gas emission are expected in comparison with the use of coal and oil based fuels in thermal engines. The same electrochemical oxygen reduction reaction takes place in oxygen depolarized cathodes (ODC) in chlor-alkali electrolysis, replacing the conventional hydrogen evolving cathode, gaining about 30% energy consumption reduction in the overall process. At present carbon-supported Pt and Pt-rich alloys are best credited to the ORR purpose. However, Pt-based catalysts are not free from certain drawbacks, such as oxide formation and Pt particle coarsening through Ostwald ripening, that decrease the overall cell energy conversion efficiency. Furthermore, attendant problems concerning natural availability, geographic distribution and cost of platinum, render platinum supply strategic and fuel cells hardly scalable to mass production. At present, projections on platinum usage for PEMFCs are estimated at ~15 ton y-1 in addition to the current ones, at a cost of ~40 $ g-1. Therefore, non-precious metal catalysts are actively searched for, such as to meet already established operational benchmarks for conventional platinum PEMFC vehicular requirements (0.5 W cm-2; 5500 h durability) with the additional target of significant cost reduction. Several papers on non-precious ORR catalysts have been published after a first report by Jasinski in 1964 demonstrating the ORR activity of metal substitutes-phthalocyanines. Then, research on metal-nitrogen macrocycles significantly expanded, leading to the picture that ORR catalytic activity can be related to N4-Me and N2-Me moieties. However, for precursors cost and unsatisfactory lifetime performance, research was steered toward more simple nitrogen-containing reactants and preparation procedures. Significant steps in this direction were obtained by Dodelet et al. who demonstrated that ORR overpotentials almost linearly decrease with increasing nitrogen content in carbon. Positive results were obtained on a series of samples prepared by high temperature treatment of carbon precursors in NH3/H2/N2 mixtures; doping of these modified carbons with iron rather than cobalt salts was shown to be preferable for better efficiency in oxygen reduction, even though still lower than that of platinum. Further improvements both in terms of incipient ORR potentials and currents were obtained by Maruyama et al. using carbons from hemoglobin and adenine-glucose pyrolysis in the presence of added Fe(II) and Cu(II)/Fe(II) mixtures, respectively. The ORR promoting role of nitrogen in carbon was independently demonstrated both theoretically and experimentally. Indeed, it was found that substitutional nitrogen at a few, specific, peripheral positions of graphene layers in well-ordered carbon nanostructures is in itself able to promote ORR activity even in the absence of accompanying metal centers. Besides the above examined composition-dependent factors, catalyst activity also depends on structural and morphological carbon support features. In fact, many electrocatalytic reactions show faster kinetics on carbon edge planes compared with basal ones. This is related to the ability of the edges to more readily chemisorb O2 (this is the same reason why O2 combusts faster from edges and defects). On the other hand, an optimized porosity of carbon supports is beneficial for an easy access of the oxygen to the catalyst layer in contact with the proton exchange electrolyte membrane. Despite carbon materials of different textural morphology are widely used at an industrial level as supports for precious metal catalysts, in the PEMFC field, electrocatalysts are by far supported on the same VULCAN XC72 carbon. Given that improved catalytic activity of Pt-based catalysts has been achieved by the use of carbons with pore size centered in the mesoporous region, even developed with advanced synthesis, including template methods, such strategy should be pursued also for Pt-free catalytic systems. In this project a number of Pt-free N-doped C-based catalysts have been synthesized on the basis of different synthetic and templating strategies aiming to understand how compositional, morphological and textural aspects of the end material can affect the electrochemical behaviour of ORR. Materials have been characterized using different physico-chemical methods including a study of the kinetics and mechanism of the electrochemical oxygen reduction reaction. Electrochemical results were obtained by rotating disk electrode (RDE) and rotating ring disk electrode (RRDE). Surface and bulk analyses have been performed by BET technique, XPS and XRPD (sometimes data were recorded at synchrotron facilities). (HR) TEM, SEM (combined with FIB milling) imaging was also performed to characterize samples morphology. Many types of samples have been synthesized, starting with mesoporours N-, Fe- doped carbons obtained by heat treatment of a solution of precursors, using silica as a templating agent. Outstanding results in terms of ORR electroactivity in acidic and alkaline conditions have been recorded. Some samples, especially in alkaline media, catalyze ORR even better than commercial Pt-based catalysts. Then, attempting to prepare materials with a precise and defined order and trying to emphasize some of their properties such as surface area and conductivity, ordered carbonaceous nano- and microstructures were synthesized. By chemical vapor deposition N-, Fe- doped carbon nanotubes (N-CNTs) were prepared and some interesting aspects related to the aging of the Fe-doped MgO catalyst used to grow N-CNTs were evidenced. Then, a modified method, but very similar to that used in the synthesis of nanotubes, surprisingly allowed the synthesis of innovative N-doped hollow carbon nanocubes (N-CNCs). This is the great novelty of the work. Due to nanocubes endothermal transformation, happening at 37°C, as detected by DSC, and to the empty space available in the internal part of each cube, many applications can be thought for example involving cubes as nano-reactors that can be opened/close in correspondence of body’s temperature changes. This feature could be taken into considerations for medical applications, after testing and verifying the biocompatibility of nanocubes. Finally, a completely different technique, an ultraspray pyrolysis method (USP) was used to obtain N-, Fe- doped carbon microspheres. The inherent scalability of continuous flow methods such as USP represents a significant advantage compared to alternative synthetic strategies requiring batch processing or surface catalyzed deposition of nanostructured carbon materials (e.g. CVD growth), this feature might be useful in order to improve electrode packing and, consequently, mass transport electrocatalytic applications. The last results section, apparently diverging from the main goals of the present work, was thought to better understand the electronic C-surface behavior in charge transfer reactions. This is actually strongly connected to the oxygen reduction reaction, for which all the catalysts, hereby synthesized, were designed. However, instead of starting from complicated systems involving porous and doped-carbons, the choice was addressed to the simplest but closest material: annealed and non-annealed amorphous carbon thin films prepared by DC-magnetron sputtering technique. Part of the work described was carried out at Trinity College Dublin in the laboratory of Prof. Colavita as a part of an academic collaboration and 5 months exchange granted by the European LLP Erasmus Program.
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Manandhar, Sudha. "Free Radical Induced Oxidation, Reduction and Metallization of NiSi and Ni(Pt)Si Surfaces." Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc31542/.

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NiSi and Ni(Pt)Si, and of the effects of dissociated ammonia on oxide reduction was carried out under controlled ultrahigh vacuum (UHV) conditions. X-ray photoelectron spectroscopy (XPS) has been used to characterize the evolution of surface composition. Vicinal surfaces on NiSi and Ni(Pt)Si were formed in UHV by a combination of Ar+ sputtering and thermal annealing. Oxidation of these surfaces in the presence of either O+O2 or pure O2 at room temperature results in the initial formation of a SiO2 layer ~ 7 Å thick. Subsequent exposure to O2 yields no further oxidation. Continued exposure to O+O2, however, results in rapid silicon consumption and, at higher exposures, the kinetically-driven oxidation of the transition metal(s), with oxides >35Ǻ thick formed on all samples, without passivation. The addition of Pt retards but does not eliminate oxide growth or Ni oxidation. At higher exposures, in Ni(Pt)Si surface the kinetically-limited oxidation of Pt results in Pt silicate formation. Substrate dopant type has almost no effect on oxidation rate. Reduction of the silicon oxide/metal silicate is carried out by reacting with dissociated NH3 at room temperature. The reduction from dissociated ammonia (NHx+H) on silicon oxide/ metal silicate layer shows selective reduction of the metal oxide/silicate layer, but does not react with SiO2 at ambient temperature.
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Zhu, Qing Shih Wei-Heng Shih Wan Y. "Characterization and application of piezoelectric microcantilever sensors fabricated from substrate-free PMN-PT layers /." Philadelphia, Pa. : Drexel University, 2008. http://hdl.handle.net/1860/2967.

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Ciubotariu, Dragos. "Design, Modeling, Fabrication and Control of PMN-PT Piezoelectric Systems." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2048/document.

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Ce travail propose l’utilisation d’un nouveau matériau, appelé PMN-PT, qui continue aider la miniaturisation des systèmes complexes, utilisés dans des différentes technologies. Le travail est présenté dans le cadre de collaboration entre deux projets, MIOP et ADMAN. Les besoins tient compte que les actionneurs soient capables de délivrer de haute déplacement tout en conservant la simplicité et la fiabilité du système. L’accent est mis sur la polyvalence de ce matériau piézo-électrique, PMN-PT, en raison de ses propriétés électro-mécanique. Le travail comprend un aperçu sur quoi influence les propriétés électro-mécaniques du PMN-PT. L’accent est mis sur deux différentes, mais très puissants coupes: anisotrope [011] et longitudinale [001], choisi pour grand déplacement et haute dynamique avec un volume petit. Pour le PMN-PT[001], une structure de type poutre a été étudié, avec un modèle amélioré pour prendre en compte les spécificités de matériel. Les déplacements et forces ont été trouvés d’ être supérieur `a un actionneur en PZT, similairement dimensionnée, tandis que avoir des non-linéarités réduites. Ceci est illustré avec une micro pince avec 6DDL. L’étude de PMN-PT [001] coupé longitudinal suit. Cette étude a été fait en utilisant PMNPT comme un actionneur avec une structure simple, facile à intégrer. Les résultats démontrent les améliorations PMN-PT peut apporter à micro-spectrométrie et la correction d’image avec des micromiroirmobiles. Un micro actionneur PMN-PT a été intégré dans une structure compatible avec des MOEMS et présenté
This work proposes the use of a novel material, called PMN-PT, that futher aids the miniaturizationof complex systems used in different technologies. The work is presented within the collaborativeframework of two projects, MIOP and ADMAN. The end-needs account for actuators capable ofdelivering high displacement, while maintaining system simplicity and reliability. The focus is onthe versatility of the PMN-PT piezoelectric material, due to its electro-mechanical properties. Thework includes an overview on what influences the electro-mechanical properties focusing on twodifferent, though very potent cuts: anisotropic [011] and longitudinal [001]. They were chosen forgenerating large displacement and high dynamics with small volume. For PMN-PT[001] a cantileverstructure was studied, for which the model was improved taking into account the material specificities.Displacements and forces were found to be superior to a similarly dimensioned PZT actuator, whilsthaving reduced non-linearities. This is exemplified with a 6 DoF capable microgripper. The PMNPT[001] longitudinal cut based actuator study follows. This is done by using PMN-PT as a simple,easy to integrate, bulk actuator. The findings demonstrate the improvements PMN-PT can bringto micro-spectrometry and image correction with micro-mirror displacement. A bulk PMN-PT microactuator was integrated into a MOEMS compatible structure and presented
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Maier, Jan Richard [Verfasser], Todd B. [Gutachter] Marder, and Bernd [Gutachter] Engels. "Investigations of Metal-free Cannibalistic Hexadehydro-Diels-Alder and Pt-catalyzed Dimerization Reactions of Linked Aryl Bisdiynes / Jan Richard Maier ; Gutachter: Todd B. Marder, Bernd Engels." Würzburg : Universität Würzburg, 2021. http://d-nb.info/1236548043/34.

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Gaddam, Sneha Sen. "Effect of Fluorine and Hydrogen Radical Species on Modified Oxidized Ni(pt)si." Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc28421/.

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NiSi is an attractive material in the production of CMOS devices. The problem with the utilization of NiSi, is that there is no proper method of cleaning the oxide on the surface. Sputtering is the most common method used for the cleaning, but it has its own complications. Dry cleaning methods include the reactions with radicals and these processes are not well understood and are the focus of the project. Dissociated NF3 and NH3 were used as an alternative and XPS is the technique to analyze the reactions of atomic fluorine and nitrogen with the oxide on the surface. A thermal cracker was used to dissociate the NF3 and NH3 into NFx+F and NHx+H. There was a formation of a NiF2 layer on top of the oxide and there was no evidence of nitrogen on the surface indicating that the fluorine and hydrogen are the reacting species. XPS spectra, however, indicate that the substrate SiO2 layer is not removed by the dissociated NF3 and NiF2 growth process. The NiF2 over layer can be reduced to metallic Ni by reacting with dissociated NH3 at room temperature. The atomic hydrogen from dissociated ammonia reduces the NiF2 but it was determined that the atomic hydrogen from the ammonia does not react with SiO2.
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Martins, Thamiris Franco. "A construção da imagem de Dilma Rousseff (PT) na esfera midiática: dissonâncias e convergências narrativas entre a presidente e a candidata à reeleição." Universidade Federal de Juiz de Fora, 2016. https://repositorio.ufjf.br/jspui/handle/ufjf/1274.

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A partir das relações de poder que se estabelecem entre o campo político e a instância comunicativa midiática, a dissertação tem como ponto de partida o conceito de campanha permanente, definido como o uso dos recursos disponíveis no trabalho por parte dos atores políticos (governos, partidos, congressistas ou líderes), a fim de construir e manter o apoio popular. A pesquisa desenvolve um estudo sobre a construção da imagem de Dilma Rousseff, do partido dos trabalhadores (PT), em três instâncias: pronunciamentos em rede de TV, Horário Gratuito de Propaganda Eleitoral (HGPE) e jornal Folha de S. Paulo. Busca-se verificar como foi trabalhada a campanha, permanente, na função de Presidente da República, eleita em 2010 e de candidata à reeleição em 2014. Como corpus de análise, são analisados, primeiramente, os espaços institucionais ocupados como presidente da República, tomando como recorte os pronunciamentos em Cadeia Nacional de Rádio e TV (CNRT), durante seu primeiro mandato. Secundariamente, procura-se verificar se a imprensa, por meio da cobertura dos pronunciamentos, projetou uma imagem negativa, positiva ou neutra de Dilma Rousseff na posição de presidente, tomando como recorte as notícias publicadas pelo jornal Folha de S. Paulo. Como terceira dimensão de análise, são investigados os HGPEs de 2014. Como estratégia metodológica, recorreu-se à Análise de Conteúdo de Bardin (1977), a fim de analisar separadamente os objetos e depois identificar os pontos de confluência e os aspectos dissonantes. Identificam-se dois momentos no governo Dilma: o de alta popularidade até as manifestações de junho de 2013, e a fase posterior, com queda da aprovação e uma disputa acirrada na eleição de 2014, quando saiu vitoriosa com um percentual muito reduzido de votos em relação ao candidato Aécio Neves do Partido Social da Democracia Brasileira (PSDB). Houve mais pontos de confluências no primeiro momento entre o discurso da petista e a cobertura da imprensa. O segundo período foi conturbado e houve uma cobertura mais negativa e crítica por parte da mídia. A comunicação eleitoral foi uma forma de buscar resgatar as ações do governo, havendo uma intensa propaganda negativa de ataques entres os adversários.
From the power relations that are establish between political field and the media communication system, this dissertation has as a key concept ‘the permanent campaign’, defined as the implementation of the any available resources for the political actors during their work (government, political parties, congressman or leaders) aiming to obtain and keep popular support. This research develops a study about the making of the image of Dilma Rousseff (PT) in three situations: pronouncement in TV network, HGPE and Folha de S. Paulo newspaper. This paper tries to verify how the permanent campaign has been undertaken as president of the Brazilian Republic, elected in 2010, and as a candidate running for reelection in 2014. As empirical data, firstly are analysed the institutionalized spaces occupied as president of the Brazilian Republic, defining as analytical material the pronouncements in National Network of Radio and Television (CNTR, in portuguese) during her fist mandate. Secondly, it tries to verify if the press, through its pronouncements coverage, created a negative, positive or neutral image of Dilma Rousseff in her position as president, taken as empirical data the news published by Folha de S. Paulo newspaper. As third material data, it will be analysed the programs of Free Political Advertising Time (HGPE, in portuguese) in 2014. As methodological strategy, we recurred to the Content Analysis (Bardin, 1977) with the goal of analysing separately the objects and then identify the convergence and dissonant aspects. We can identify two different moments in Dilma’s government: high popularity until june 2013 manifestations and the subsequent period with fall of approval and fierce competition on the 2014 election, when she won the elections with a minor percentage of votes in relation to the candidate Aécio Neves (PSDB). There were more confluence aspects in the first period between the president’s pronouncements and the media coverage. The second moment was troubled and there was a more negative and critical coverage by the media. The electoral communication was an attempt to retrieve the governments’ actions and there was an intense negative propaganda of attacks between the candidates.
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Li, Chun-Ting, and 李君婷. "Dye-sensitized Solar Cells:Study of Pt-free Counter Electrodes and Iodide-free Electrolytes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/a2622n.

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博士
國立臺灣大學
化學工程學研究所
103
This dissertation aimed to systematically develop Pt-free counter electrodes (CEs) and to design a novel iodide-free electrolyte for the dye-sensitized solar cells (DSSCs) with low-costs and highly cell efficiencies (η’s). This dissertation is divided into two parts: (1) Pt-free CEs (Chapter 3~Chapter 7) and (2) iodide-free electrolyte (Chapter 8). In the case of Pt-free CEs, we aim to reduce the costs of the DSSCs using various electro-catalysts for completely replacing the expensive Pt via the simple, non-vacuum, and low-cost fabrication processes. Accordingly, three types of Pt-free composite films were studied using a standard iodide electrolyte. (I) Transition metallic compound-type CEs, including the composite film of TiS2/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (TiS2/PEDOT:PSS) in Chapter 3, the composite films of Si3N4/PEDOT:PSS, SiO2/PEDOT:PSS, SiS2/PEDOT:PSS, SiSe2/PEDOT:PSS in Chapter 4, and the composite films of Zn3N2/PEDOT:PSS, ZnO/PEDOT:PSS, ZnS/PEDOT:PSS, ZnSe/PEDOT:PSS in Chapter 5, were indivitually investigated. In a composite film, the transition metallic compound nanoparticles were separately used to provide attractive electro-catalytic abilities and large active areas for I3- reduction; among those NPs, TiS2, Si3N4, SiS2, SiSe2, Zn3N2 and ZnSe were applied in DSSCs for the first time. Among them, the cell with Zn3N2/PEDOT:PSS CE reached a higher η than that of Pt-based cell. (II) Carbonaceous-type CEs, i.e., the composite films of nano-porous carbon black nanoparticles/ sulfonated-poly(thiophene-3-[2-(2-methoxyethoxy)-ethoxy]-2,5-diyl) (CB NPs/s-PT), were investigated in Chapter 6 to provide large surface area, fast eletrolyte penetratoin, and rapid reaction rate for I3– reduction. When a composite film contains 5 wt% CB NPs, the pertinent DSSC reached best η of 9.02%, which is even higher than that of Pt-based DSSC. The s-PT is introduced as a novel thiophene-based water-soluable conducting polymer for CE in DSSC for the very first time. Under weak sunlight, the cell with CB NPs/s-PT composite CE still maintains good performance, indicating its good compatibility at both outdoor or indoor electronics. (III) Conducting polymer type CEs, including poly(3,4-ethylenedioxythiophene) (PEDOT) and six different ionic-liquid-doped PEDOT films were systematically investigated in Chapter 7. Six different ionic liquids containing three imidazolium cations with different alkyl chains (–C2H5, –C6H13, –C10H21) and four anions (BF4−, PF6−, SO3CF3−, TFSI−) were used as the chemical dopants to increase the surface area of PEDOT films and to ehance the conjugation of the PEDOT films, respectively. Among them, the cell with HMIPF6-doped PEDOT and HMITFSI-doped PEDOT CEs reached higher η’s than that of Pt-based DSSC. In brief, this dissertation explores four Pt-free composite films of Zn3N2/PEDOT:PSS, HMIPF6-doped PEDOT, HMITFSI-doped PEDOT, and CB NPs/s-PT are a promising substitutions of Pt due to their outstanding properties, i.e., good electro-catalytic ability for I3– reduction, low-cost, simple preparation process, and easy for large-scale production. In the case of iodide-free electrolyte, we designed a novel dual-channel ionic liquid compound (Chapter 8), 1-butyl-3-{2-oxo-2-[(2,2,6,6-tetramethylpiperidin-4-yl)amino]ethyl}-1H-imidazol-3 -ium selenocyanate (ITSeCN), to further improve the cell effiency of DSSCs. ITSeCN is designed to contain dual redox channels of imidazolium-functionalized TEMPO (cationic redox mediator) and selenocyanate (anionic mediator). Thereby, the ITSeCN shows the favorable redox natures, which gave more positive standard potential, larger diffusivity, and better kinetic heterogeneous rate constant than those of iodide. To further investigate a suitable electro-catalytic material for triggering the redox of ITSeCN mediator, several materials were used: (1) Pt (metal type), (2) PEDOT (conducting polymer type), (3) CoSe (transition metallic compound type), and (4) carbon black (carbonaceous type) films were chosen to represent four types of electro-catalytic materials in DSSCs. Finally, the DSSCs with PEDOT and CoSe CEs achieved better performance than that of the Pt-based DSSC. Therefore, it can be infered that the transition metallic compound type CEs would be more suitable for our new synthesized-ITSeCN mediator than the others.
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Huang, Yi-June, and 黃奕鈞. "Pt-Free Nanostructural Electrocatalysts for Dye-Sensitized Solar Cells." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/2h8bax.

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博士
國立臺灣大學
化學工程學研究所
107
This dissertation aimed to systematically study Pt-free and TCO-free counter electrodes (CEs) with low-costs and highly cell efficiencies (η’s). This dissertation is divided into two parts: (1) Pt-free CEs (Chapter 3 and Chapter 4) and (2) Pt-free and TCO-free CEs (Chapter 5 and Chapter 6). In the case of Pt-free CEs, we aim to reduce the costs of the DSSCs using various electro-catalysts for completely replacing the expensive Pt via the simple, non-vacuum, and low-cost fabrication processes. Accordingly, three types of Pt-free composite films were studied using a standard iodide electrolyte. (I) Transition metallic compound-type CEs, i.e. CoSe2/CoSeO3 with nanocube (NC), nanorod (NR), and nanoparticle (NP) structures in Chapter 3, the composite films of CoSe2/CoSeO3 with hierarchical urchin-like structure in Chapter 4, were indivitually investigated. In the composite film, the different nanostructures were separately used to provide attractive electro-catalytic abilities and large active areas for I3- reduction. (II) Transition metallic and conducting polymer type CEs, i.e. MoSe2 NS/PEDOT:PSS in Chapter 5, were investigated to provide large surface area, fast eletrolyte penetration, well adhesion, and rapid reaction rate for I3- reduction. (III) Carbonaceous-type CEs, i.e. pristine monolithic carbon aerogel (CA-O, CA-Q, CA-F, CA-C, and CA-G) in Chapter 6, were investigated by controlled resorcinol (R)/formaldehyde (F) and resorcinol (R)/sodium carbonate (C) molar ratios. In the case of Pt-free and TCO-free CEs. In the case of Pt-free and TCO-free CEs, the classic TCO substrate is replaced by Ti foil and carbon aerogel for low-cost, simple preparation process, and large-scale production. (I) Ti foil substrate collocate with MoSe2 NS/PEDOT:PSS, which presents a higher η of 8.51 ± 0.05%, as compared to a lower η of 8.21 ± 0.02% using the Pt-coated Ti foil CE. (II) Carbon aerogel replace traditional CEs based on the Pt/FTO/glass in DSSCs. The DSSCs using the as-prepared CA-C CE gave the best η of 9.08 ± 0.01%, among all the CA CEs. In brief, this dissertation explores three Pt-free composite films of CoSe2/CoSeO3, MoSe2 NS/PEDOT:PSS, and CA are a promising substitutions of Pt due to their outstanding properties, i.e., good electro-catalytic ability for I3– reduction, low-cost, simple preparation process, and easy for large-scale production.
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Books on the topic "Pt-free"

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Freemasons. St. Mark's Lodge, No. 94 (Port Stanley, Ont.). By-laws of St. Mark's Lodge, No. 94 of Free and Accepted Masons, Pt. Stanley, May, 1863. [St. Thomas, Ont.?: s.n.], 1985.

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Ceric, Lubo. Black Ops: Free of Charge Pt 4. Independently Published, 2019.

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Bynum, Victoria E. Free State of Jones [Standard Large Print 16 Pt Edition]. ReadHowYouWant.com, Limited, 2012.

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Berliner, Lawrence J., Sandra S. Eaton, and Gareth R. Eaton. Biomedical EPR - Part a: Free Radicals, Metals, Medicine and Physiology Pt. A. Springer London, Limited, 2007.

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Paradoxes of Free Will (Transactions of the American Philosophical Society, V. 92, Pt. 6) (Transactions of the American Philosophical Society, V. 92, Pt. 6). American Philosophical Society, 2002.

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McDonald, Bart. Debt-Free PT: A Guide for Physical Therapists - Eliminate Student Loans and Obtain Financial Freedom. McDonald Therapy, 2021.

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Hill, William G. PT: A Coherent for a Stress-free, Healthy and Properous Life Without Government intereference, Taxes or Coercion. Scope International, 1996.

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van Houselt, Arie, and Harold J. W. Zandvliet. Self-organizing atom chains. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.9.

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This article examines the intriguing physical properties of nanowires, with particular emphasis on self-organizing atom chains. It begins with an overview of the one-dimensional free electron model and some interesting phenomena of one-dimensional electron systems. It derives an expression for the 1D density of states, which exhibits a singularity at the bottom of the band and extends the free-electron model, taking into consideration a weak periodic potential that is induced by the lattice. It also describes the electrostatic interactions between the electrons and goes on to discuss two interesting features of 1D systems: the quantization of conductance and Peierls instability. Finally, the article presents the experimental results of a nearly ideal one-dimensional system, namely self-organizing platinum atom chains on a Ge(001) surface, focusing on their formation, quantum confinement between the Pt chains and the occurrence of a Peierls transition within the chains.
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Bower, Sylvia Llewelyn, Mary Kay Sharrett, and Steve Plogsted. Celiac Disease: A Guide to Living with Gluten Intolerance [Standard Large Print 16 Pt Edition]. ReadHowYouWant.com, Limited, 2014.

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Americans With Disabilities Act Handbook: 2001-2 Cumulative Supplement (Americans With Disabilities Act Handbook. Cumulative Supplement, 2001, Pt 2). 3rd ed. Aspen Publishers, 2001.

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Book chapters on the topic "Pt-free"

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Wu, Mingxing, and Tingli Ma. "Low-Cost Pt-Free Counter Electrode Catalysts in Dye-Sensitized Solar Cells." In Green Energy and Technology, 77–87. London: Springer London, 2014. http://dx.doi.org/10.1007/978-1-4471-6473-9_4.

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Gu, Huiming, Wan Y. Shih, and Wei-Heng Shih. "Study of Mechanism of Pyrochlore-Free PMN-PT Powder Using a Coating Method." In Ceramic Transactions Series, 55–64. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118406861.ch6.

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Jauhari, Himanshi, Rakhi Grover, D. S. Mehta, and Kanchan Saxena. "Studies on Alternate Counter Electrode Materials for Pt—Free Dye Sensitized Solar Cells." In Springer Proceedings in Physics, 323–27. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-97604-4_49.

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Pilipczuk, Marcin, Michał Pilipczuk, and Paweł Rzążewski. "Quasi-polynomial-time algorithm for Independent Set in Pt-free graphs via shrinking the space of induced paths." In 2021 Proceedings of the Workshop on Algorithm Engineering and Experiments (ALENEX), 204–9. Philadelphia, PA: Society for Industrial and Applied Mathematics, 2021. http://dx.doi.org/10.1137/1.9781611976472.23.

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Pilipczuk, Marcin, Michał Pilipczuk, and Paweł Rzążewski. "Quasi-polynomial-time algorithm for Independent Set in Pt-free graphs via shrinking the space of induced paths." In Symposium on Simplicity in Algorithms (SOSA), 204–9. Philadelphia, PA: Society for Industrial and Applied Mathematics, 2021. http://dx.doi.org/10.1137/1.9781611976496.23.

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Fadnis, Anand G., and Terence J. Kemp. "Spin Trapping and Matrix Isolation E.S.R. Studies of Photo-Oxidation of Alcohols by Hexachlorometallate (IV) Ions (M = PT, PD, IR)." In Organic Free Radicals, 53–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73963-7_27.

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Huang, Yi-June, Han-Ting Chen, Shiuan-Bai Ann, Chun-Ting Li, and Chuan-Pei Lee. "Structural Engineering on Pt-Free Electrocatalysts for Dye-Sensitized Solar Cells." In Nanostructures. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.85307.

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Vinduja, Puttanveedu, and Karuvanthodi Muraleedharan. "Theoretical Studies on Anti-Oxidant Activity of the Phytochemical, Coumestrol and Its Derivatives." In Functional Foods - Phytochemicals and Health Promoting Potential. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96967.

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Free radical-induced changes in cellular and organ levels have been studied as a possible underlying cause of various adverse health conditions. Important research efforts have, therefore, been made to discover more powerful and potent antioxidants/free radical scavengers for the treatment of these adverse conditions. The phytoestrogen coumestrol intensively attracted scientific interest due to their efficient pharmacological activities. In this scenario, DFT studies were carried out to test the antiradical activities of coumestrol and its derivatives. The results obtained from FEDAM plots demonstrated that the coumestrol derivatives pointed out were good radical scavengers relative to the parent molecule in the gas phase. The derivatives whose 16thposition substituted with electron-donating groups like -NH2, -OCH3 and -CH3 showed good antioxidant capacity. Three antioxidant mechanisms, including hydrogen atom transfer (HAT), electron transfer followed by proton transfer (SET-PT), and sequential proton loss electron transfer (SPLET), were investigated by measuring thermodynamic parameters.
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Chandra, Prakash. "Applications of 3d-transition metals as Pt-free counter electrode for dye-sensitized solar cells application." In Dye-Sensitized Solar Cells, 213–35. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-818206-2.00005-0.

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Huang, Yi-June, and Chuan-Pei Lee. "Nanostructured Transition Metal Compounds as Highly Efficient Electrocatalysts for Dye-Sensitized Solar Cells." In Solar Cells [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94021.

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Nowadays, the requirement of energy increases every year, however, the major energy resource is fossil fuel, a limiting source. Dye-sensitized solar cells (DSSCs) are a promising renewable energy source, which could be the major power supply for the future. Recently, the transition metal component has been demonstrated as potential material for counter electrode of platinum (Pt)-free DSSCs owing to their excellent electrocatalytic ability and their abundance on earth. Furthermore, the transition metal components exist different special nanostructures, which provide high surface area and various electron transport routs during electrocatalytic reaction. In this chapter, transition metal components with different nanostructures used for the application of electrocatalyst in DSSCs will be introduced; the performance of electrocatalyst between intrinsic heterogeneous rate constant and effective electrocatalytic surface area are also be clarified. Final, the advantages of the electrocatalyst with different dimensions (i.e., one to three dimension structures) used in DSSCs are also summarized in the conclusion.
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Conference papers on the topic "Pt-free"

1

Leo, Teresa J., Elena Posada, Oscar Santiago, Vladimir Meca, Isabel Carrillo, and Eva Chinarro. "Development of Electrodes for Fuel Cells Pt-Free Load." In 36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2023). Las Palmas De Gran Canaria, Spain: ECOS 2023, 2023. http://dx.doi.org/10.52202/069564-0097.

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Nersessian, Nersesse, Anirban Chaudhuri, Shaju John, Gang Wang, and Norman M. Wereley. "Blocked force and free displacement characterization of PMN-32%PT stacks." In The 14th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, edited by Marcelo J. Dapino. SPIE, 2007. http://dx.doi.org/10.1117/12.716349.

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Monticone, F., C. Valagiannopoulos, S. Savoia, R. Fleury, and A. Alu. "PT-symmetric metamaterial systems for aberration-free imaging and wave manipulation." In 2015 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS). IEEE, 2015. http://dx.doi.org/10.1109/metamaterials.2015.7342581.

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Kumar, Arun, Ashok Kumar, and P. K. Ahluwalia. "Electronic and optical properties of free standing Pt nanowires using localized basis sets." In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710260.

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Sokolov, A. S., D. Lim, H. Han, Y. Jeon, Y. Abbas, S. Son, and C. Choi. "Low-power, Forming-free and Analog-type Resistive Switching in Pt/SiOx/ZnO/Pt Oxide Heterostructures as an Electronic Synapse." In 2017 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2017. http://dx.doi.org/10.7567/ssdm.2017.ps-9-08.

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BUI, D. N., X. L. ZHAO, S. Z. KANG, and J. MU. "CuO LOADED SrTiO3 NANOPARTICLES: AN EFFICIENT Pt-FREE PHOTOCATALYST FOR H2 EVOLUTION FROM WATER." In Proceedings of International Conference Nanomeeting – 2011. WORLD SCIENTIFIC, 2011. http://dx.doi.org/10.1142/9789814343909_0140.

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Tallavo, F. J., M. D. Pandey, M. Jyrkama, N. C. Christodoulou, G. A. Bickel, and B. W. Leitch. "A Comparative Evaluation of Finite Element Modeling of Creep Deformation of Fuel Channels in CANDU® Nuclear Reactors." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84982.

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A key element of the fuel channel life cycle management in CANDU® nuclear reactors is to prevent contact between the pressure tube (PT) and the calandria tube (CT) in a fuel channel. By preventing PT-CT contact, the development of hydride blisters and delayed hydride cracking of the PT can be avoided. The PT-CT contact is a result of in-reactor deformation due to irradiation induced creep of the fuel channel assembly. Excessive sagging of the PT can also interfere with the free passage of the fuel bundles when the channel is refueled. Contact of the CT with reactor control mechanisms located horizontally between the fuel channels can result from excessive sag of the CT. The prediction of dimensional changes due to in-reactor creep and the time of PT-CT contact is calculated using finite element modeling of the fuel channel with appropriate creep constitutive laws describing PT and CT deformation. The three-dimensional nature of creep deformation of fuel channels can be approximated by a one-dimensional finite element model (1D-FEM), which is a computationally tractable problem. However, the simplifications of a 1D-FEM model come at the expense of loss of prediction accuracy. This paper compares creep deformation analysis of fuel channels using 1D-FEM and 3D-FEM models. The comparison is based on PT and CT sag profiles as well as on PT-CT gap at different time intervals during service of the fuel channel. Results from the comparative analysis show that the 1D-FEM model predicts greater values of PT-CT gap. The difference in gap predicted between both FEM models increases rapidly when the minimum gap is located in the outlet span. At 250,000 equivalent full power hours, the 1D-FEM model overestimate the gap by 1.12 mm with respect to the 3D-FEM model.
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Kodaira, Akio, Hiroyuki Nabae, Tetsuya Horiuchi, Kinji Asaka, Gen Endo, and Koichi Suzumori. "Au/Pt Double-Layer Electrodes and Expanding Internal Chamber for Improving Air-Hose-Free Thin McKibben Muscles." In 2021 IEEE 4th International Conference on Soft Robotics (RoboSoft). IEEE, 2021. http://dx.doi.org/10.1109/robosoft51838.2021.9479222.

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Bousoulas, P., D. Sakellaropoulos, J. Giannopoulos, and D. Tsoukalas. "Improving the resistive switching uniformity of forming-free TiO2−x based devices by embedded Pt nanocrystals." In ESSDERC 2015 - 45th European Solid-State Device Research Conference. IEEE, 2015. http://dx.doi.org/10.1109/essderc.2015.7324767.

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Irmawati, Yuyun, Edwin M. Mauludi, Fredina Destyorini, Andri Hardiansyah, Haryo S. Oktaviano, Agung Nugroho, and Rike Yudianti. "One-pot synthesis of CoFe alloy supported on N-doped carbon as Pt-free oxygen reduction catalysts." In THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIAL AND TECHNOLOGY (ICAMT) 2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0106430.

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