Дисертації з теми "Electrochemical production"
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Weaver, Eric P. "Low voltage electrochemical hydrogen production." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001849.
Повний текст джерелаCloutier, Caroline R. "Advanced electrochemical reforming of methanol for hydrogen production." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/39857.
Повний текст джерелаFatollahi-Fard, Farzin. "Production of Titanium Metal by an Electrochemical Molten Salt Process." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/893.
Повний текст джерелаLandon, James R. "Electrochemical Oxygen Production: Catalyst Development to Meet the World’s Oxygen Demands." Research Showcase @ CMU, 2011. http://repository.cmu.edu/dissertations/557.
Повний текст джерелаGhahremani, Raziyeh. "Electrochemical Oxidation of Lignin for the Production of Value-added Chemicals." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1603983239429615.
Повний текст джерелаWang, Huizhi, and 王慧至. "Electrochemical conversion of aluminum energy: energy efficiency, co-production concept and systemcharacteristics." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B4697040X.
Повний текст джерелаLyu, Xiang. "Furfural and Hydrogen Production from Raw Biomass Integrating Chemical and Electrochemical Methods." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1605089185418469.
Повний текст джерелаPaschkewitz, Timothy Michael. "Ammonia Production at Ambient Temperature and Pressure: An Electrochemical and Biological Approach." Diss., University of Iowa, 2012. https://ir.uiowa.edu/etd/4893.
Повний текст джерелаLowe, Sean E. "Electrochemical Approaches for the Production of Functional Graphene and its Niche Applications." Thesis, Griffith University, 2019. http://hdl.handle.net/10072/389548.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environment and Sc
Science, Environment, Engineering and Technology
Full Text
Zhao, Ge. "Effects of surface microstructure and nanostructure on osteoblast-like mg63 cell number, differentiation and local factor production." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/36532.
Повний текст джерелаGoldet, Gabrielle. "Electrochemical investigations of H2-producing enzymes." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:696e5b9d-a80f-493e-85d4-0954be499b72.
Повний текст джерелаBenson, Lyndsey. "Production and development of titanium alloys derived from synthetic rutile using electrochemical deoxidation." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18922/.
Повний текст джерелаKirkaldy, Niall. "Exploring organic, redox-active materials for electrolytic hydrogen production and electrochemical energy storage." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/30842/.
Повний текст джерелаRichardson, Caleb 1792?-1820. "Production of phosphorus alloys through thermal reactions and electrochemical reduction of molten apatite." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/131003.
Повний текст джерелаCataloged from the official PDF version of thesis.
Includes bibliographical references (pages 32-34).
A process for extracting phosphorus from fluorapatite through high temperature electrochemical means. Theoretical modelling and calculations show that P-alloys can be manufactured directly from decomposed molten fluorapatite. Nickel-phosphide is chosen as an examplary alloy both for its incredible thermodynamic stability and for its mechanical properties. Molten hydroxyapatite decomposes as it melts into two solid phosphorus rich phases, tricalcium phosphate and tetracalcium phosphate. Fluourapatite behaves in a similar manner, albeit at a higher temperature. These two calcium phosphates can be reduced to calcium oxide and oxygen in the presence of nickel, forming Ni₃P. Included in this paper is an in-depth overview of current and past phosphorus reduction methods and a discussion of their improvement.
by Caleb Richardson.
S.B.
S.B. Massachusetts Institute of Technology, Department of Materials Science and Engineering
Rodene, Dylan D. "Engineering of Earth-Abundant Electrochemical Catalysts." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/6106.
Повний текст джерелаWiencke, Jan-Christian. "Analysis of the electrochemical processes during the production of liquid iron by Molten Oxide Electrolysis." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0329.
Повний текст джерелаMolten oxide electrolysis (MOE) is an ambitious technique for the production of liquid iron by the use of renewable energies and thus lower CO2 emissions in the steel industry. In this concept, electrolysis is used to produce gaseous O2 and liquid iron metal at temperatures above 1810 K. In the experimental study presented here the key-parameters of the electrochemical reactions in a magnesio-aluminosilicate electrolyte and at the electrodes during MOE are investigated. A significant amount of liquid iron metal was produced during experiments of several hours. SEM-EDS analysis of the deposit revealed an alloy of iron metal and of the cathode material, which thereby indicates high process selectivity. Investigation of the electrolyte’s response in dependence of cell voltage and iron concentration inferred a diffusional limitation at low iron oxide concentrations at potentials below 1.5 V. The cathode half-reaction was identified as the reduction of ferrous iron to liquid iron metal. Using Tafel interpretation reaction-transfer coefficients close to 0.6 and an order of reaction around 1 were determined. The analysis of the anode half-reaction showed that in low iron bearing molten oxides, oxide anions were firstly oxidized into O2 gas. At high iron concentrations the charge transfer is conducted in the entire cell voltage range by the oxidation of ferrous iron. The participation of oxide anions in the charge transfer was only witnessed at high cell voltages. In the entire compositional range a limitation of the measured current due to the anode half reaction was not observed
Bauer, Ralph Aaron. "Inorganic membranes for power generation and oxygen production." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1556889103215598.
Повний текст джерелаSkar, Rolf Alexander. "Chemical and Electrochemical Characterisation of Oxide/Hydroxide Impurities in the Electrolyte for Magnesium Production." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-104.
Повний текст джерелаThis work is part of a research program where the aim is to develop an
electroanalytical technique to determine the amount of dissolved oxide and hydroxide in industrial Mg electrolytes. The systems studied were mixtures of MgCl2 and NaCl, ranging from pure MgCl2 to melts containing 10 mole % MgCl2 / 90 mole % NaCl. To these melts, additions of MgO and MgOHCl were done at temperatures ranging from 475 to 850°C. Voltammetric measurements were performed before and after addition of MgO or MgOHCl and melt samples were taken for analysis. The quenched melt samples wereanalysed by carbothermal reduction analysis and the acid consumption method to obtain the O2- and OH- contents in the samples. Linear sweep voltammetry was performed with a sweep rate of 200 mV/sec in two potential regions to detect the concentration of dissolved MgOHCl and MgO. The experiments were performed inside a glove box having water and oxygen contents of, respectively, <1 ppm and <2 ppm. The results indicate that the rate of decomposition of MgOHCl increases with increasing temperature, as expected. In melts with high content of NaCl the underpotential deposition of sodium has a large influence on the uncertainty in the reading of the current density of MgOHCl reduction. Linear relations between MgO and MgOHCl concentrations and the peak current densities for the electrochemical reactions of the dissolved MgO and MgOHCl species in the melt, respectively, were observed. The diffusion coefficients of MgO and MgOHCl in the different melts were calculated. The diffusion coefficients decrease with increasing content of MgCl2. For MgOHCl the diffusion coefficient decreases from 5.6*10-5 cm2/sec in 20 mole % MgCl2 / 80 mole % NaCl to 2.1*10-5 cm2/sec in pure MgCl2, both measurements done at 800°C. For MgO the diffusion coefficient decreases from 6*10-5 cm2/sec in 41.5 mole % MgCl2 / 58.5 mole % NaCl to 0.8*10-5 cm2/sec in pure MgCl2, both measurements done at 730°C. The results show that it is possible to use cyclic voltammetry for quantitative analysis of MgOHCl in MgCl2 based melts.
Jeong, Yeon Uk. "Solution-based chemical synthesis of electrode materials for electrochemical power sources /." Digital version:, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p9992829.
Повний текст джерелаRautenbach, Daniel. "The development of an electrochemical process for the production of para-substituted di-hydroxy benzenes." Thesis, Nelson Mandela Metropolitan University, 2005. http://hdl.handle.net/10948/159.
Повний текст джерелаByrne, C. S. C. "The modelling of a reaction and reactor for the electrochemical production of geraniol and nerol." Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371252.
Повний текст джерелаEskandari, Azin. "A preliminary theoretical and experimental study of a photo-electrochemical cell for solar hydrogen production." Thesis, Université Clermont Auvergne (2017-2020), 2019. http://www.theses.fr/2019CLFAC104.
Повний текст джерелаIn order to meet the energy and climate challenge of the coming 21st century, one solution consists of developing processes for producing storable energy carriers by artificial photosynthesis to synthesize solar fuels, in particular hydrogen, in order to valorize the solar resource. The understanding of these processes and the achievement of high kinetic and energetic performances require the development of generic, robust and predictive knowledge models considering radiative transfer as a physical process controlling the process at several scales but also including the various other phenomena involved in the structure or reification of the model.In this PhD work, the photo-reactive process at the heart of the study was the photo-electrochemical cell. More complex than the simple photoreactor, with a photo-anode and a (photo)cathode, the photo-electrochemical cell spatially dissociates the oxidation and reduction steps. Based both on the existing literature (mainly in the field of electrochemistry) and by deploying the tools developed by the research team on radiative transfer and thermokinetic coupling formulation, it was possible to establish performance indicators of photo-electrochemical cells.In parallel to the establishment of this model, an experimental approach was undertaken based first on a commercial Grätzel-type cell (DS-PEC) indicating the general trends of such photon energy converters with in particular a drop in energy efficiency as a function of the incident photon flux density. A modular experimental device (Minucell) has also been developed and validated in order to characterize photo-anodes of different compositions such as chromophore impregnated TiO2 electrodes for operation in Grätzel cells or Fe2O3 hematite electrodes (SC-PEC) where the semiconductor plays both the functions of photon absorption and charge carrier conduction. Above all, the Minucell device allowed to test, characterize and model the behavior of a bio-inspired photo-electrochemical cell for H2 production using at the photo-anode a Ru-RuCat molecular catalyst (developed by ICMMO Orsay/CEA Saclay) and at the cathode a CoTAA catalyst (developed by LCEMCA Brest). Minucell was used to characterize each constituent element of a photo-electrochemical cell and then the cell as a whole confirming the trends and observations obtained on energy efficiencies.This preliminary work opens up a wide range of research prospects, lays common ground between electrochemistry and photo-reactive systems engineering, and provides insights into the design and kinetic and energy optimization of photo-electrochemical cells for the production of hydrogen and solar fuels
Zhang, Yubai. "Electrochemical synthesis of 2D materials and their applications in energy storage." Thesis, Griffith University, 2021. http://hdl.handle.net/10072/410071.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environment and Science
Science, Environment, Engineering and Technology
Full Text
Taheri, Najafabadi Amin. "High-yield production of graphene sheets by graphite electro-exfoliation for application in electrochemical power sources." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59330.
Повний текст джерелаApplied Science, Faculty of
Graduate
Nota, Monica. "Electrochemical oxidation of Kraft lignin for the production of value-added chemicals on Ni and Co electrocatalysts." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21706/.
Повний текст джерелаDas, Gupta R. "The electrochemical production of filled carbon nanotubes and their use as anode materials in lithium-ion batteries." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598289.
Повний текст джерелаGmitter, Andrew J. "The influence of inert anode material and electrolyte composition on the electrochemical production of oxygen from molten oxides." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44211.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 109-116).
Shifts in global and political climates have led industries worldwide to search for more environmentally sound processes that are still economically viable. The steel industry is studying the feasibility of molten oxide electrolysis, a novel process by which molten iron and gaseous oxygen are the products; no carbon dioxide is produced at the site of the electrolysis cell. The research presented in this thesis focuses on the anodic reaction and the preliminary development of an inert anode, as well as investigations into the mechanism of the oxygen evolution reaction. Various elements have been considered with the platinum group metals possessing the best combination of physical properties to serve as the inert anode. Cyclic voltammetry at 1575°C was used to compare the candidates. Iridium yielded the highest current density at a given overpotential followed by rhodium and platinum regardless of the composition of the electrolyte. Speculation as to metal oxide intermediate phases formed and mechanisms for the oxygen evolution reaction are discussed. Notably, the basicity of the molten aluminosilicate electrolyte was found to greatly influence the rate of oxygen gas evolution as evidenced by the linear dependence of the current density on optical basicity. This is crucial for the design of a full-scale electrolysis cell as improved kinetics of the anodic reaction will yield higher throughput and/or enhanced power efficiency. Combining our finding of the relationship between current density and basicity with previous authors' contributions on the effect of partial pressure of oxygen, we argue that to a first approximation, the magnitude of the current density is governed by the concentration of free oxide ions and by the partial pressure of oxygen in the headspace above the melt.
(cont.) Lastly, to, in part, address the disparate natures of the interests of steelmakers, glassmakers, geochemists, and electrochemists, the difficulties in performing electrochemical measurements at extremely high temperatures (~1600°C), and the absence of a comprehensive review of the last sixty years of work on oxygen evolution from molten silicates, this thesis is intended to serve as an essential guide for future work in this field.
by Andrew J. Gmitter.
S.M.
Molefe, Lerato Yvonne. "Polyacrylic acid and polyvinylpyrrolidone stabilised ternary nanoalloys of platinum group metals for the electrochemical production of hydrogen from ammonia." University of the Western Cape, 2016. http://hdl.handle.net/11394/5317.
Повний текст джерелаThe electrochemical oxidation of ammonia has attracted much attention as an efficient green method for application in direct ammonia fuel cells (DAFCs) and the production of high purity hydrogen. However, the insufficient performance and high costs of platinum has hindered the large scale application of ammonia (NH₃) electro-oxidation technologies. Therefore, there is a need for the fabrication of efficient electrocatalysts for NH₃ electrooxidation with improved activity and lower Pt loading. Owing to their unique catalytic properties, nanoalloys of platinum group metals (PGMs) are being designated as possible electrocatalysts for NH₃ oxidation. This study presents for the first time a chemical synthesis of unsupported ternary PGM based nanoalloys such as Cu@Pt@Ir with multi-shell structures and Cu-Pt-Ir mixed nanoalloys for electro-catalysis of NH3 oxidation. The nanoalloys were stabilised with polyvinylpyrrolidone (PVP) as the capping agent. The structural properties of the nanoalloys were studied using ultraviolet-visible (UV-Vis) and fourier transform infra-red (FTIR) spectroscopic techniques. The elemental composition, average particle size and morphology of the materials were evaluated by high resolution transmission electron microscopy (HRTEM) coupled to energy dispersive X-ray (EDX) spectroscopy. High resolution scanning electron microscopy (HRSEM) was used for morphological characterisation. Additionally, scanning auger nanoprobe microscopy (NanoSAM) was employed to provide high performance auger (AES) spectral analysis and auger imaging of complex multi-layered Cu@Pt@Ir nanoalloy surface. X-ray diffraction (XRD) spectroscopy was used to investigate the crystallinity of the nanoalloys. The electrochemistry of the nanoalloy materials was interrogated with cyclic voltammetry (CV) and square wave voltammetry (SWV). The electrocatalytic activity of novel Cu-Pt-Ir trimetallic nanoalloys for the oxidation of ammonia was tested using CV. UV-Vis spectroscopy confirmed the complete reduction of the metal precursors to the respective nanoparticles. FTIR spectroscopy confirmed the presence of the PVP polymer as well as formation of a bond between the polymer (PVP) chains and the metal surface for all nanoparticles (NPs). Furthermore, HRTEM confirmed that the small irregular interconnected PVP stabilised Cu@Pt@Ir NPs were about 5 nm in size. The elemental composition of the alloy nanoparticles measured using EDX also confirmed the presence of Cu, Pt and Ir. Cyclic voltammetry indicated that both the GCE|Cu-Pt-Ir NPs and GCE|Cu@Pt@Ir NPs are active electrocatalysts for NH3 oxidation as witnessed by the formation of a well-defined anodic peak around -0.298 V (vs. Ag/AgCl). Thus the GCE|Cu-Pt-Ir NPs was found to be a suitable electrocatalyst that enhances the kinetics of oxidation of ammonia at reduced overpotential and high peak current in comparison with GCE|Cu@Pt@Ir NPs, GCE|Pt NPs, GCE|Ir NPs and GCE|Cu NPs electrocatalysts. The presence of the crystalline phases in each sample was confirmed by XRD analysis. The surface analysis of Cu@Pt@Ir nanoalloy with AES surveys revealed the presence of Pt, Ir and Cu elements in all probed spots suggesting some mixing between the layers of the nanoalloy. Yet, analysis of nanoalloys by CV and XRD confirmed the presence of Cu-Pt and Pt-Ir solid solutions in the Cu-Pt-Ir and Cu@Pt@Ir nanoalloys respectively.
Duda, Royce D. "Genetic Manipulation and Culturing of Azotobacter vinelandii for the Production of Nitrogenase for Use in Protein-Engineered Electrochemical Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1530282333596752.
Повний текст джерелаWilson, Aaron Doyle. "Electrochemical catalysts for the production and oxidation of hydrogen featuring nickel complexes containing cyclic diphosphine ligands with positioned pendant amines." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3207761.
Повний текст джерелаMejia, Rodriguez Ma del Rosario. "Ligand effects on bioinspired iron complexes." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2504.
Повний текст джерелаВороніна, Олена Володимирівна. "Електродні процеси на сплавах та сполуках ванадію в водневій енергетиці". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/38323.
Повний текст джерелаThesis for granting the Degree of Candidate of Technical sciences in speciality 05.17.03 – Technical Electrochemistry. – National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2018. The thesis deals with the development of the technological process of hydrogen production using new electrode materials based on vanadium alloys and aluminum alloys. The vanadium based electrode material exclude the formation of ferrites in alkaline electrolysis. Aluminum alloys exclude the oxygen evolution on the anodes due to the corrosion process with hydrogen depolarization. Therefore it is possible to produce hydrogen on both electrodes in electrolyzers without membrane in alkaline water electrolysis. The kinetic dependences and mechanisms of hydrogen evolution on aluminum alloys have been determined, which leads to the reduce of overvoltage of hydrogen evolution reaction on cathodes and produce hydrogen on anodes by aluminum dissolving. Experimental-industrial tests of oxygen-free hydrogen production in developed electrolyzers at cell voltages of 0.3-1 V are presented. This allows to reduce the material and energy costs of electrolysis.
Вороніна, Олена Володимирівна. "Електродні процеси на сплавах та сполуках ванадію в водневій енергетиці". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/38316.
Повний текст джерелаThesis for granting the Degree of Candidate of Technical sciences in speciality 05.17.03 – Technical Electrochemistry. – National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2018. The thesis deals with the development of the technological process of hydrogen production using new electrode materials based on vanadium alloys and aluminum alloys. The vanadium based electrode material exclude the formation of ferrites in alkaline electrolysis. Aluminum alloys exclude the oxygen evolution on the anodes due to the corrosion process with hydrogen depolarization. Therefore it is possible to produce hydrogen on both electrodes in electrolyzers without membrane in alkaline water electrolysis. The kinetic dependences and mechanisms of hydrogen evolution on aluminum alloys have been determined, which leads to the reduce of overvoltage of hydrogen evolution reaction on cathodes and produce hydrogen on anodes by aluminum dissolving. Experimental-industrial tests of oxygen-free hydrogen production in developed electrolyzers at cell voltages of 0.3-1 V are presented. This allows to reduce the material and energy costs of electrolysis.
Naderinasrabadi, Mahtab. "A Continuous Electrochemical Process to Convert Lignin to Low Molecular Weight Aromatic Compounds and Cogeneration of Hydrogen." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1584622583669502.
Повний текст джерелаWitkowska, Malgorzata Danuta. "Interrogation of the manufacturing route of aluminium AA 1050 used in lithographic application." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/interogation-of-the-manufacturing-route-of-aluminium-aa-1050-used-in-lithographic-application(57658930-cb45-470e-b6ab-626781f1c8a2).html.
Повний текст джерелаYu, Wenchao. "Development of nanostructured materials based on manganese oxides and produced by an electrochemical method for water electrolysis." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066383/document.
Повний текст джерелаThe basic electrodeposition mechanism of MnO2 films was studied first on bulk Pt electrodes in various aqueous electrolytes. It was revealed that MnO2 electrodeposition is a multi-step reaction that is sensitive to pH and ionic strength. Chronoamperometry coupled to low concentration neutral aqueous solutions favors the electrodeposition of stable MnO2 films. FTO was found to be a better substrate than ITO, because it has a higher electrochemical activity and could enhance the mechanical stability of electrodeposited MnO2 films. Moreover, the potential used for electrodeposition has great influence on both the structure and the morphology of MnO2 films. Amorphous MnO2 films obtained at high potential possess higher electrocatalytic activity and stability than the birnessite-type MnO2 variety. The heat treatment can greatly enhance the electrocatalytic activity and mechanical stability. A phase transition of MnO2 films appears at 500 °C. The morphology changes dramatically after heating above this temperature. Samples heated at 500 °C are found to have the best electrocatalytic activity towards OER. Na+, K+, Ca2+ and Mg2+ cations were found to be inserted in small amounts into the structure of MnO2 films during the electrodeposition procedure but they influence the structure and morphology of the films. Finally, birnessite type and amorphous MnO2 films appear to be promising candidates as catalysts for photoelectrochemical water splitting, as they are able to generate considerable photocurrents under solar light illumination. In this purpose, thick and amorphous films with 500 °C heat treatment are supposed to produce the best performances
Sikorskytė, Aušra. "Auginimo technologijų įtaka 'Elise' obuolių kokybei." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2007. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2007~D_20070816_153932-61327.
Повний текст джерелаSikorskytė A. Growing technologies influence on quality of apple ‘Elise’: the final work of Master’s Degree Studies of Agro ecology specialisation of Ecology speciality/ Supervisor V. Rutkovienė; LŽŪU. – K., 2007 – 54 pages: 16 pictures, 15 tables, 2 annexes, 63 literature sources. SUMMARY The final work of Master Degree Studies is based on the research of influence of growing technologies on quality of apple variety Elise. The object of the final work – As an object of the research fruits of one variety Elise of genus Malus plants were selected. Following plants are growing in the educational – phomological garden of Landscape faculty of college of Kaunas (Mastaičiai, Kaunas district). Apple trees of variety Elise are grown under organic and conventional conditions. The aim of the final work – to evaluate the influence of growing technologies on the quality of apple fruits Elise. Methods of the final work – experimental; electrochemical and chemical research of quality has been made; the analysis of science literature and data of research. Result of the final work. The quality of organic farming and conventionally grown apple fruits has been evaluated according to electrochemical, physical and chemical characteristics. Judging by the results obtained the yield from conventional apple trees has been bigger then those grown by the organic farming. The correlation between electrochemical and physical results has been obtained as follows: strong converse relations are among... [to full text]
Cooper, Matthew E. "Energy Production from Coal Syngas Containing H2S via Solid Oxide Fuel Cells Utilizing Lanthanum Strontium Vanadate Anodes." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1219867679.
Повний текст джерелаGallagher, Kevin Gregory. "Challenges in low-temperature fuel cells." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/37264.
Повний текст джерелаBateni, Fazel. "Development of Non-precious Metal and Metal Oxide Electrocatalysts for an Alkaline Lignin Electrolysis Process." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1562674707447307.
Повний текст джерелаMensah, Joel B. [Verfasser], Regina Akademischer Betreuer] Palkovits, and Lars Mathias [Akademischer Betreuer] [Blank. "Chemo-catalytic and electrochemical deoxygenation of bio-derivable 3-hydroxydecanoic acid : production of drop-in fuels and fine chemicals / Joel Boakye Mensah ; Regina Palkovits, Lars M. Blank." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1226303811/34.
Повний текст джерелаGueneau, de Mussy Jean Paul. "Production and study of a Ti/Ti02/Noble metal anode." Doctoral thesis, Universite Libre de Bruxelles, 2002. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211348.
Повний текст джерелаPlusieurs métaux de notre vie courante sont obtenus industriellement au moyen de procédés électrolytiques. Un des procédés les plus communs est l’électro-obtention de cuivre, dans lequel le métal est déposé à la cathode tandis que l'oxygène se dégage à l'anode. Généralement, en usine, plusieurs anodes et cathodes, ayant une surface de 1 m2 et séparées par plus ou moins 10 cm sont alternées dans une cellule contenant une solution d'acide sulfurique riche en sulfate de cuivre. En fonction des conditions d'utilisation, les cathodes sont remplacées, après un certain temps, par des nouvelles de façon à récupérer le cuivre déposé. De ce fait, les anodes doivent être capables de résister sans se corroder, se déformer ou perdre leurs propriétés électrocatalytiques pendant de longues périodes. Au début, des alliages en Pb (pb-Ag, Pb-Ca-Sn,) ont été utilisés comme anodes. Malheureusement, malgré leur faible prix, ces anodes présentent des surtensions élevées et une faible résistance à la corrosion et au fluage. Par conséquent, une alternative aux anodes traditionnelles en 1 développée. Ce nouveau type d'anode, connu sous le nom d’anode dimensionnellement stable (DSA) est fabriquée à partir d'une tôle en Ti recouverte par un mélange d'oxydes de métaux nobles catalysant la réaction de dégagement d'oxygène. Différentes techniques peuvent être utilisées pour préparer la couche d'oxyde. La technique la plus souvent employée consiste à décomposer thermiquement une solution de chlorures contenant un ou plusieurs nobles. Malheureusement, ce type d'anode est cher et a tendance à perdre son activité électrocatalytique avec le temps.
Dans le but de produire une DSA à faible prix, pouvant résister de longues périodes sans se passiver, un nouveau type de DSA a été développé dans le présent travail. Cette anode est produite par électrodépôt d'un métal noble dans les pores d'un substrat microporeux en Ti/TiO2.
Ce travail a permis de démontrer qu'une DSA avec une concentration en métal noble peut être obtenue par la voie proposée. Il a été montré que les propriétés électriques et électrochimiques de ces DSAs sont directement liées aux caractéristiques morphologiques et structurales du en Ti/TiO2. Lorsque la couche barrière existant au fond des pores est suffisamment fine et que le film présente des défauts, la résistance me l'interface Ti/métal noble est faible. Ceci abouti à des DSAs possédant d'excellentes propriétés électrocatalytiques. Les DSAs optimales sont capables de résister à des conditions similaires à celles employées en industrie avec des surtensions de ~ 0.4 V, ce qui représente un gain de 50% par rapport aux surtensions normalement atteintes par les anodes traditionnelles en Pb.
Doctorat en sciences appliquées
info:eu-repo/semantics/nonPublished
Tatin, Arnaud. "Electrochemical CO2 splitting into CO and O2 in neutral water using earth-abundant materials : from molecular catalysts to a whole electrolyzer." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC164/document.
Повний текст джерелаElectrical energy (preferably issued from renewable sources) can be stored in chemical bonds thanks to an appropriate electrolyzer. Typical reactions include hydrogen generation, the production of hydrocarbons and oxygenates, and ammonia synthesis. Such electrofuels supplement the integration of renewable energy sources in the electrical production mix; they are compatible with the current industrial infrastructure and supply chain, while they can be stored easily. Besides, they may be used either as a means to store the electricity in the chemical bonds of high-energy-content molecules or as various feedstocks to manufacture high value compounds.The thesis focused on the development of new molecular catalysts for the selective CO2-to-CO conversion in water using only earth-abundant materials, namely iron-based porphyrin derivatives. First, successful and unsuccessful attempts to derive new catalysts with various substituents are reviewed. Once an active water-soluble catalyst is identified, a performance assessment is completed using electrochemical techniques such as cyclic voltammetry investigations.Then, the immobilization of said catalysts onto the electrode surface is discussed. Once a robust integration in the catalytic film is secured, the coupling with a heterogeneous water-oxidation catalyst can be considered. The subsequent assembly of a whole electrolysis cell is reported, where a cobalt-based film was picked for the anode. Finally, economic perspectives provide a clear, rational basis for future optimization of the device
Gross, Pierre-Alexandre. "Modification de nanotubes de TiO2 pour la production d’hydrogène par photodissociation de l’eau sous lumière solaire." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAF053.
Повний текст джерелаThis work is about the production of hydrogen by photoelectrocatalysis using a vertically aligned TiO2 nanotubes based photoanode. Utilization of TiO2 for solar applications is limited due to its large band gap, it has to be modified. Two approaches are proposed for the modification of the TiO2 nanotubes to make them absorb visible light. The first one is the chemical modification of the TiO2 by (Ta-N) or (Nb-N) cationic-anionic co-doping. Cations are inserted during the growth of the nanotubes by a novel approach, and nitrogen is inserted during heat treatment. This leads to the formation of hybrid orbitals resulting in a band gap reduction and of activity under visible light. The second approach consists of the deposition of Ag nanoparticles on the surface of the TiO2 nanotubes. Thanks to the control of the morphology of the Ag nanoparticles, their plasmonic resonance can enhance the absorption of TiO2 and thus increase its activity both under UV and visible light
Nechache, Aziz. "Mise en place et développement d'un outil de diagnostic in situ basé sur la spectroscopie d'impédance électrochimique pour l'étude des électrolyseurs haute température à oxyde solide." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066137.
Повний текст джерелаAn in situ diagnosis tool, based on electrochemical impedance spectroscopy, for the study of solid oxide electrolyzer cells was established through the analysis of the influence of several parameters (current density, temperature, gas composition and gas flow rate) on the performances and the behavior of a commercial single cell studied in a two-electrode configuration. The main phenomena governing the cell were identified. An analysis of its behavior after appearance and evolution with time of a premature degradation was carried out. A mechanism explaining the origin and the consequences of such degradation was suggested. Furthermore, studying the influence of the cathode thickness allowed distinguishing two of the main phenomena associated to H2O diffusion at the Ni-YSZ electrode. In addition, a study of the cell behavior after degradation by electronic conduction of the YSZ electrolyte showed formation of numerous porosities leading to delaminations at the YSZ/YDC interface. This phenomenon was characterized by a shift of the overall impedance diagram to the lowest frequencies, with appearance of a negative loop which finally leads to the disappearance of Rp as the current circulates mostly via electronic conduction of the YSZ electrolyte
Lapinsonnière, Laure. "Contribution à l'évaluation et à l'optimisation des application des systèmes microbio-électrochimiques : traitement des eaux, production d'électricité, bioélectrosynthèse." Phd thesis, Université Rennes 1, 2013. http://tel.archives-ouvertes.fr/tel-01002645.
Повний текст джерелаAllanore, Antoine. "Étude expérimentale de la production de fer électrolytique en milieu alcalin : mécanisme de réduction des oxydes et développement d'une cellule." Thesis, Vandoeuvre-les-Nancy, INPL, 2007. http://www.theses.fr/2007INPL109N/document.
Повний текст джерелаIron is one of the few metals which is not industrially produced by electrolysis. The electrowinning of iron metal from its oxides in alkaline solution has been studied to develop such an ironmaking route. Two approaches have been adopted. The first one concerns the evaluation of the reaction mechanism. The study of iron ions electrochemistry in alkaline media shows that the electrodeposition of iron metal is possible. The study of a single iron oxide particle reduction reveals that a reaction of the hematite solid phase is possible. The analysis of a partially converted particle proves that magnetite is formed as an intermediate. The second field of study is dedicated to the production of iron metal in various electrochemical cells, using a suspension electrolysis process. The influence of the key operating parameters is established to assess the possible scale-up. All these elements are gathered to propose the main features of an industrial cell dedicated to the reaction
Chauveau, Florent. "Synthèse et caractérisations électrochimiques de nouveaux matériaux pour anodes d'électrolyseurs à haute température." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13944/document.
Повний текст джерелаHigh temperature steam electrolysis (HTSE) is a way to produce hydrogen with a high purity, with noteworthy efficiency and without CO2 emission. Nowadays, a blocking point concerning this technology is the high overvoltage related to the oxidation of the O2- ions occurring at the oxygen electrode (anode). The aim of this work was to design new anode materials with mixed conducting properties (i.e. electronic and ionic), in order to obtain larger reaction areas and to lessen this overvoltage. In this aim, eight compounds (ferrites and rare earth nickelates) were investigated. After synthesis and shaping, these compounds were characterized using physical, chemical and electrochemical analyses in symmetrical half cells, under single atmosphere, in order to determine which ones have the best properties under zero current and under anodic polarization. Four compounds of structure derived from K2NiF4-type were then selected to be more accurately characterized in complete electrolyte supported cells, under HTSE conditions (750 - 850°C). It was then possible to obtain, for a 1.3 V cell voltage, a current density of 0.9 A/cm² at 850°C, which is nearly two times larger than the one obtained with a same cell including a commercial composite material based on strontium substituted LaMnO3 as anode
Gueret, Robin. "Systèmes moléculaires pour la production d'hydrogène photo-induite dans l'eau associant des catalyseurs de cobalt à un photosensibilisateur de ruthénium ou un colorant organique." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAV074/document.
Повний текст джерелаThe work of this manuscript is focused on the design of molecular systems in homogeneous solution for photocatalytic production of molecular hydrogen in water using cobalt catalysts with pentadentate tetrapyridinic and tetra- and pentaza macrocyclic ligands. In association with [Ru(bpy)3]2+ as photosensitizer and sodium ascorbate as sacrificial electron donor, the macrocycle based catalysts display high performances for H2 production, far exceeding those of the polypyridine based catalysts, both in terms of activity and stability, because of the stability of their reduced state «Co(I)». Finally, [Ru(bpy)3]2+ was successfully substituted with a robust organic dye belonging to the triazatriangulenium family, leading to an even more efficient photocatalytic system. These results demonstrate well that organic dyes are a truly efficient alternative to noble metal based photosensitizers, even in acidic aqueous medium
Smith, Elliott Ryan. "Electrochemical, Spectroscopic, and Theoretical Studies on the Effects of Exchanging Se for S in the 2FeE (E= S or Se) Butterfly Core and Modifications to the µ-E to µ-E Linkers in [FeFe]-Hydrogenase Inspired Electrocatalysts for H₂ Production." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/312561.
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