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Artículos de revistas sobre el tema "Pt-free"

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Autor: Grafiati

Publicado: 6 de septiembre de 2023

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1

Heo, Pilwon, Hidetaka Shibata, Masahiro Nagao y Takashi Hibino. "Pt-free intermediate-temperature fuel cells". Solid State Ionics 179, n.º 27-32 (30 de septiembre de 2008): 1446–49. http://dx.doi.org/10.1016/j.ssi.2007.12.090.

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2

CLACENS, J. "Pt-free sulphur resistant NOx traps". Applied Catalysis B: Environmental 53, n.º 1 (octubre de 2004): 21–27. http://dx.doi.org/10.1016/j.apcatb.2004.04.014.

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3

Nie, Yao, Li Li y Zidong Wei. "Recent advancements in Pt and Pt-free catalysts for oxygen reduction reaction". Chemical Society Reviews 44, n.º 8 (2015): 2168–201. http://dx.doi.org/10.1039/c4cs00484a.

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4

Thompson, Eric L. y Daniel Baker. "Proton Conduction on Ionomer-Free Pt Surfaces". ECS Transactions 41, n.º 1 (16 de diciembre de 2019): 709–20. http://dx.doi.org/10.1149/1.3635605.

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5

Favaron, O. y J. L. Fouquet. "On m-centers in Pt-free graphs". Discrete Mathematics 125, n.º 1-3 (febrero de 1994): 147–52. http://dx.doi.org/10.1016/0012-365x(94)90155-4.

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6

Meng, Hui y Pei Kang Shen. "Novel Pt-free catalyst for oxygen electroreduction". Electrochemistry Communications 8, n.º 4 (abril de 2006): 588–94. http://dx.doi.org/10.1016/j.elecom.2006.01.020.

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7

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, n.º 4 (febrero de 2022): 4693–98. http://dx.doi.org/10.1016/j.ceramint.2021.11.005.

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8

Almarjan, Lulu, Deni Muhammad Danial y Dicky Jhoansyah. "Pengaruh Free Cash Flow terhadap Kebijakan Hutang". BUDGETING : Journal of Business, Management and Accounting 1, n.º 2 (26 de junio de 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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9

Dominici, C., F. Petrucci, S. Caroli, A. Alimonti, A. Clerico y M. A. Castello. "A pharmacokinetic study of high-dose continuous infusion cisplatin in children with solid tumors." Journal of Clinical Oncology 7, n.º 1 (enero de 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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10

Ye, Heng, Guofeng Ma, Jian Kang, Hongqi Sun y Shaobin Wang. "Pt-Free microengines at extremely low peroxide levels". Chemical Communications 54, n.º 37 (2018): 4653–56. http://dx.doi.org/10.1039/c8cc01548a.

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11

Qi, Gongshin y Wei Li. "Pt-free, LaMnO3 based lean NOx trap catalysts". Catalysis Today 184, n.º 1 (abril de 2012): 72–77. http://dx.doi.org/10.1016/j.cattod.2011.11.012.

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12

Groenland, Carla, Karolina Okrasa, Paweł Rzążewski, Alex Scott, Paul Seymour y Sophie Spirkl. "H-colouring Pt-free graphs in subexponential time". Discrete Applied Mathematics 267 (agosto de 2019): 184–89. http://dx.doi.org/10.1016/j.dam.2019.04.010.

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13

Shen, Yu, Minqing Wang, Hui Xia, Lei Zheng, Na Ta, Ye Meng y Fenge Cui. "Pseudobinary Phase Diagrams of Eutectic Reaction for Pt‐containing and Pt‐free 718Plus Alloys". Advanced Engineering Materials 23, n.º 5 (18 de febrero de 2021): 2001233. http://dx.doi.org/10.1002/adem.202001233.

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14

Wang, Wenqing, Hongbin Zhao, Baolin Zhang y Hailing Tu. "Forming-Free Pt/Ti/AlOx/CeOx/Pt Multilayer Memristors with Multistate and Synaptic Characteristics". Journal of Nanomaterials 2022 (5 de octubre de 2022): 1–9. http://dx.doi.org/10.1155/2022/1370919.

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Due to their unique electrical performance and simple structure, memristors exhibit excellent application prospects for future information technology. In this work, we fabricated Pt/Ti/AlOx/CeOx/Pt memristors demonstrating electroforming-free bipolar resistive switching behavior with low operating voltage (−1 to 1 V), stable endurance, and retention. Space-charge limited conduction (SCLC) as well as the formation and rupture of conductive filaments are responsible for the resistive switching behavior. Increasing the magnitude of the RESET voltage could generate multistate resistive switching. We studied the synaptic characteristics of the device by obtaining multilevel conductance states and investigating the relationship between the device resistance, pulse amplitude, pulse width, and pulse number. By applying programmed pre and postsynaptic spiking pulses, spike-timing dependent plasticity was observed. This study shows that the device is suitable for multivalue storage and can be used as an electronic synapse device in artificial neural networks.

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15

Kurnia, F., Chunli Liu, C. U. Jung y B. W. Lee. "The evolution of conducting filaments in forming-free resistive switching Pt/TaOx/Pt structures". Applied Physics Letters 102, n.º 15 (15 de abril de 2013): 152902. http://dx.doi.org/10.1063/1.4802263.

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16

Nie, Yao, Li Li y Zidong Wei. "ChemInform Abstract: Recent Advancements in Pt and Pt-Free Catalysts for Oxygen Reduction Reaction". ChemInform 46, n.º 25 (junio de 2015): no. http://dx.doi.org/10.1002/chin.201525299.

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17

Okazaki-Maeda, K., Y. Morikawa, Shingo Tanaka y Masanori Kohyama. "Effects of Supports on Hydrogen Adsorption on Pt Clusters". Solid State Phenomena 139 (abril de 2008): 41–46. http://dx.doi.org/10.4028/www.scientific.net/ssp.139.41.

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Pt nano-particles are supported on carbon materials at the electrode catalysts of protonexchange menbrane fuel cells. Pt nano-particles are desirable to be strongly adsorbed on carbon materials for high dispersion, although strong Pt-C interactions may affect the catalytic activity of small clusters. Thus we have examined H-atom absorption on Pt clusters supported or unsupported on graphene sheets, using first-principles calculations. For Pt-atom/graphene systems, a H atom is more weakly adsorbed than for a free Pt atom, and the H-Pt interaction becomes weaker if the interaction between a Pt atom and graphene becomes stronger. For the Ptn-cluster/graphene systems (n=2-4), the H-Pt interactions are also substantially changed from those for free Pt clusters. In the Pt clusters on graphene, the Pt-Pt distances are substantially changed associated with the electronicstructure changes by the Pt-C interactions. These structural and electronic changes in the Pt clusters as well as the presence of graphene itself seem to cause the changes in the absorption energies and preferential sites of H-atom absorption.

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18

Cruz-Martínez, Heriberto, Wilbert Guerra-Cabrera, Ernesto Flores-Rojas, Dunia Ruiz-Villalobos, Hugo Rojas-Chávez, Yesica A. Peña-Castañeda y Dora I. Medina. "Pt-Free Metal Nanocatalysts for the Oxygen Reduction Reaction Combining Experiment and Theory: An Overview". Molecules 26, n.º 21 (5 de noviembre de 2021): 6689. http://dx.doi.org/10.3390/molecules26216689.

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The design and manufacture of highly efficient nanocatalysts for the oxygen reduction reaction (ORR) is key to achieve the massive use of proton exchange membrane fuel cells. Up to date, Pt nanocatalysts are widely used for the ORR, but they have various disadvantages such as high cost, limited activity and partial stability. Therefore, different strategies have been implemented to eliminate or reduce the use of Pt in the nanocatalysts for the ORR. Among these, Pt-free metal nanocatalysts have received considerable relevance due to their good catalytic activity and slightly lower cost with respect to Pt. Consequently, nowadays, there are outstanding advances in the design of novel Pt-free metal nanocatalysts for the ORR. In this direction, combining experimental findings and theoretical insights is a low-cost methodology—in terms of both computational cost and laboratory resources—for the design of Pt-free metal nanocatalysts for the ORR in acid media. Therefore, coupled experimental and theoretical investigations are revised and discussed in detail in this review article.

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19

Fiorellino, Francesca, Martina Pilloni, Andrea Ardu, Valentina Cabras, Stefano Columbu, Lisa Russo, Alessandra Scano y Guido Ennas. "(FeCo/Ppy@C): Pt-Free FeCo-Polypyrrole Nanocomposites Supported On Porous Carbon For Electrochemical Application". Advanced Materials Letters 10, n.º 4 (1 de febrero de 2019): 253–58. http://dx.doi.org/10.5185/amlett.2018.2203.

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20

Massaglia, Giulia, Isabella Fiorello, Adriano Sacco, Valentina Margaria, Candido Pirri y Marzia Quaglio. "Biohybrid Cathode in Single Chamber Microbial Fuel Cell". Nanomaterials 9, n.º 1 (28 de diciembre de 2018): 36. http://dx.doi.org/10.3390/nano9010036.

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The aim of this work is to investigate the properties of biofilms, spontaneously grown on cathode electrodes of single-chamber microbial fuel cells, when used as catalysts for oxygen reduction reaction (ORR). To this purpose, a comparison between two sets of different carbon-based cathode electrodes is carried out. The first one (Pt-based biocathode) is based on the proliferation of the biofilm onto a Pt/C layer, leading thus to the creation of a biohybrid catalyst. The second set of electrodes (Pt-free biocathode) is based on a bare carbon-based material, on which biofilm grows and acts as the sole catalyst for ORR. Linear sweep voltammetry (LSV) characterization confirmed better performance when the biofilm is formed on both Pt-based and Pt-free cathodes, with respect to that obtained by biofilm-free cathodes. To analyze the properties of spontaneously grown cathodic biofilms on carbon-based electrodes, electrochemical impedance spectroscopy is employed. This study demonstrates that the highest power production is reached when aerobic biofilm acts as a catalyst for ORR in synergy with Pt in the biohybrid cathode.

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21

Nabae, Y., M. Chokai, T. Ichihara, T. Hayakawa y T. Aoki. "Pt-Free Cathode Catalyst Prepared From Polyimide Fine Particles". ECS Transactions 58, n.º 1 (31 de agosto de 2013): 1501–7. http://dx.doi.org/10.1149/05801.1501ecst.

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22

Wang, Yibo, Tengfei Li, Mingming Li, Yingrui Li, Qinglei Liu, Xiaohui Zhang y Jiajun Gu. "Pt-decorated fluorine-free Ti3C2TX for hydrogen evolution reaction". Journal of Materials Science: Materials in Electronics 31, n.º 14 (20 de junio de 2020): 11345–51. http://dx.doi.org/10.1007/s10854-020-03683-2.

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23

Moskovkin, P. y M. Hou. "Metropolis Monte Carlo predictions of free Co–Pt nanoclusters". Journal of Alloys and Compounds 434-435 (mayo de 2007): 550–54. http://dx.doi.org/10.1016/j.jallcom.2006.08.178.

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24

Huang, Shenwei. "Improved complexity results on k-coloring Pt-free graphs". European Journal of Combinatorics 51 (enero de 2016): 336–46. http://dx.doi.org/10.1016/j.ejc.2015.06.005.

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25

Ishimoto, Takayoshi y Michihisa Koyama. "Theoretical Study on Solubility from Pt Electrocatalyst and Reactivity in Electrolyte Environment of Pt Complex in PEFC". International Journal of Electrochemistry 2012 (2012): 1–9. http://dx.doi.org/10.1155/2012/318461.

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We theoretically analyzed the formation energy and solvation free energy of Pt(II) and Pt(IV) complexes with three types of ligands(H2O,OH−,and CF3SO3 −)in electrolyte environment under the low- and high-humidity conditions to study the Pt electrocatalyst degradation and dissolution mechanisms for polymer electrolyte fuel cell. To represent the low- and high-humidity conditions in perfluorosulfonic acid (PFSA) polymer electrolyte membrane, we controlled the dielectric constant based on the experimental result. We observed general tendencies that the formation energy becomes larger while the solvation free energy becomes smaller under the low-humidity condition. The degradation of Pt complex from Pt surface is indicated to be accelerated by the adsorption of the end group of PFSA polymer side chain, on the Pt surface by comparing the desorption energies of [Pt(H2O)2(OH)3(CF3SO3)] and [Pt(H2O)2(OH)4]. The [Pt(H2O)4]2+is not formed by the proton addition reaction between Pt complexes under the low-humidity condition of PFSA environment. From the analysis of possible reaction pathways of Pt complexes, we found the influence of humidity on the reactivity of Pt complex.

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26

Ren, Xue, Liang Liu, Bin Cheng, Weikang Liu, Ruiyue Chu, Tingting Miao, Taiyu An, Guangjun Zhou, Bin Cui y Jifan Hu. "Field-free switching of magnetization induced by spin–orbit torque in Pt/CoGd/Pt thin film". Applied Physics Letters 120, n.º 25 (20 de junio de 2022): 252403. http://dx.doi.org/10.1063/5.0092513.

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All-electric control of magnetism is essential for the future ultralow-power memory and logic spintronic applications. Here, we report a highly efficient way to realize field-free current-induced switching of magnetization in ferrimagnetic CoGd, which is deposited with composite target. The critical switching current density is as low as ∼1 × 107 A/cm2. Without any gradient designs, our CoGd film intrinsically exhibits extraordinary titled magnetic anisotropy and bias-fields. The field-free switching of magnetizations can be achieved by applying current pulses in x or y directions. We further establish a coupled ferrimagnetic macrospin model subjected to the Landau–Lifshitz–Gilbert–Slonczewski equation, and the theoretical results agree with experiments well. All these results suggest that deposition with composite target is the optimal route to fabricate a high performance spin–orbit torque device, which provides multiple routes to achieve field-free, deterministic, and low-consumption magnetization switching.

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27

Lee, Tae Kyu, Hyang Jin Park, Min Ki Kwon, Ju Hae Jung, Junbom Kim y Seung Hyun Hur. "Polyol-Free Synthesis of Uniformly Dispersed Pt/Graphene Oxide Electrocatalyst by Sulfuric Acid Treatment". Journal of Nanomaterials 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/418737.

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Polyol-free synthesis of highly loaded Pt catalysts on sulfuric-acid-treated graphene oxide (SGO) was reported. Sulfuric acid treatment increased the surface hydroxyl groups on graphene oxide (GO), which contributed to the reduction of Pt precursors in the absence of external reducing agent. By adjusting pH during the Pt reduction, we can get uniformly dispersed 2.5 nm size Pt nanoparticles on GO surface even at 50 wt% Pt loading amount. Cyclic voltammetry showed that increased pH resulted in increased electrochemical surface area.

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28

Sun, Lian, Qian Zhang, Qijie Liang, Wenbo Li, Xiangguo Li, Shenghua Liu y Jing Shuai. "α-Fe2O3/Reduced Graphene Oxide Composites as Cost-Effective Counter Electrode for Dye-Sensitized Solar Cells". Catalysts 12, n.º 6 (13 de junio de 2022): 645. http://dx.doi.org/10.3390/catal12060645.

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The counter electrode (CE) is an important and vital part of dye-sensitized solar cells (DSSCs). Pt CEs show high-performance in DSSCs using iodide-based electrolytes. However, the high cost of Pt CEs restricts their large-scale application in DSSCs and the development of Pt-free CE is expected. Here, α-Fe2O3/reduced graphene oxide (α-Fe2O3/RGO) composites are prepared as the Pt-free CE materials for DSSCs. A simple hydrothermal technique was used to disseminate the α-Fe2O3 solid nanoparticles uniformly throughout the RGO surface. The presence of the α-Fe2O3 nanoparticles increases the specific surface area of RGO and allows the composites to be porous, which improves the diffusion of liquid electrolyte into the CE material. Then, the electrocatalytic properties of CEs with α-Fe2O3/RGO, α-Fe2O3, RGO, and Pt materials are compared. The α-Fe2O3/RGO CE has a similar electrocatalytic performance to Pt CE, which is superior to those of the pure α-Fe2O3 and RGO CEs. After being fabricated as DSSCs, the current–voltage measurements reveal that the DSSC based on α-Fe2O3/RGO CE has a power conversion efficiency (PCE) of 6.12%, which is 88% that of Pt CE and much higher than that of pure α-Fe2O3 and pure RGO CEs. All the results show that this work describes a promising material for cost-effective, Pt-free CEs for DSSCs.

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29

Kohlheyer, Dietrich, Jan C. T. Eijkel, Stefan Schlautmann, Albert van den Berg y Richard B. M. Schasfoort. "Bubble-Free Operation of a Microfluidic Free-Flow Electrophoresis Chip with Integrated Pt Electrodes". Analytical Chemistry 80, n.º 11 (junio de 2008): 4111–18. http://dx.doi.org/10.1021/ac800275c.

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30

Men Truong, Van, Julian Richard Tolchard, Jørgen Svendby, Maidhily Manikandan, Hamish A. Miller, Svein Sunde, Hsiharng Yang, Dario R. Dekel y Alejandro Oyarce Barnett. "Platinum and Platinum Group Metal-Free Catalysts for Anion Exchange Membrane Fuel Cells". Energies 13, n.º 3 (27 de enero de 2020): 582. http://dx.doi.org/10.3390/en13030582.

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The development of active hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR) catalysts for use in anion exchange membrane fuel cells (AEMFCs), which are free from platinum group metals (PGMs), is expected to bring this technology one step closer to commercial applications. This paper reports our recent progress developing HOR Pt-free and PGM-free catalysts (Pd/CeO2 and NiCo/C, respectively), and ORR PGM-free Co3O4 for AEMFCs. The catalysts were prepared by different synthesis techniques and characterized by both physical-chemical and electrochemical methods. A hydrothermally synthesized Co3O4 + C composite ORR catalyst used in combination with Pt/C as HOR catalyst shows good H2/O2 AEMFC performance (peak power density of ~388 mW cm−2), while the same catalyst coupled with our flame spray pyrolysis synthesised Pd/CeO2 anode catalysts reaches peak power densities of ~309 mW cm−2. Changing the anode to nanostructured NiCo/C catalyst, the performance is significantly reduced. This study confirms previous conclusions, that is indeed possible to develop high performing AEMFCs free from Pt; however, the challenge to achieve completely PGM-free AEMFCs still remains.

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31

Dhobi, Saddam Husain, Suresh Prasad Gupta, Jeevan Jyoti Nakarmi, Bibek Koirala, Kishori Yadav, Sharad Kumar Oli y Milan Gurung. "Scattering of Free Electrons with Hydrogen Atoms in Proton Exchange Membrane Fuel Cell System". International Annals of Science 13, n.º 1 (6 de marzo de 2023): 22–28. http://dx.doi.org/10.21467/ias.13.1.22-28.

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The objective of this work is to study the Klein-Nishina (KN) cross section during the collision of free electrons and atoms (H-atom and Pt-atom) near the cathode of Proton Exchange Membrane Fuel Cell (PEMFCs). The developed KN cross section was computed using MATLAB shows KN cross section decrease with an increase with the temperature. The maximum KN cross section recorded for single scattering is about -70.2m2 and -66m2 in natural log terms during the collision of free electrons with H-atom and Pt-atom, respectively. The maximum KN cross section recorded for 1ml flow of hydrogen is about -26.6m2 and -22.25m2 in natural log term during the collision of free electrons with H-atom and Pt-atom, respectively.

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32

Charde, Rashmi P., Brian van Devener y Michael M. Nigra. "Surfactant- and Ligand-Free Synthesis of Platinum Nanoparticles in Aqueous Solution for Catalytic Applications". Catalysts 13, n.º 2 (21 de enero de 2023): 246. http://dx.doi.org/10.3390/catal13020246.

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The synthesis of surfactant-free and organic ligand-free metallic nanoparticles in solution remains challenging due to the nanoparticles’ tendency to aggregate. Surfactant- and ligand-free nanoparticles are particularly desirable in catalytic applications as surfactants, and ligands can block access to the nanoparticles’ surfaces. In this contribution, platinum nanoparticles are synthesized in aqueous solution without surfactants or bound organic ligands. Pt is reduced by sodium borohydride, and the borohydride has a dual role of reducing agent and weakly interacting stabilizer. The 5.3 nm Pt nanoparticles are characterized using UV-visible spectroscopy and transmission electron microscopy. The Pt nanoparticles are then applied as catalysts in two different reactions: the redox reaction of hexacyanoferrate(III) and thiosulfate ions, and H2O2 decomposition. Catalytic activity is observed for both reactions, and the Pt nanoparticles show up to an order of magnitude greater activity over the most active catalysts reported in the literature for hexacyanoferrate(III)/thiosulfate redox reactions. It is hypothesized that this enhanced catalytic activity is due to the increased electron density that the surrounding borohydride ions give to the Pt nanoparticle surface, as well as the absence of surfactants or organic ligands blocking surface sites.

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33

Chen, Kai-Huang, Chien-Min Cheng, Ying-Jie Chen y Mei-Li Chen. "Lead-Free Piezoelectric Ceramic Micro-Pressure Thick Films". Crystals 13, n.º 2 (22 de enero de 2023): 201. http://dx.doi.org/10.3390/cryst13020201.

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In this study, non-stoichiometry lead-free piezoelectric ceramic Li0.058(K0.48Na0.535)0.966(Nb0.9Ta0.1)O3 (LKNNT) thick films were deposited on Pt/Ti/Si substrates using spin-coating method technology to form a LKNNT/Pt/Ti/Si structure of the micro-pressure thick films. Additionally, the influence on the crystalline properties, surface microstructure images, and mechanical properties, and the piezoelectric properties of the non-stoichiometry lead-free piezoelectric ceramic Li0.058(K0.48Na0.535)0.966(Nb0.9Ta0.1)O3 (LKNNT) thick films were observed, analyzed, and calculated using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), focused ion beam (FIB) microscopy, nano-indention technology, and other instruments. This study was divided into two parts: The first part was the investigation into the fabrication parameters and properties of the bottom layer (Pt) and buffer layer (Ti). The Pt/Ti/Si structures were achieved by the DC sputtering method, and then the rapid thermal annealing (RTA) post-treatment process was used to re-arrange the grains and reduce defects in the lead-free Li0.058(K0.48Na0.535)0.966(Nb0.9Ta0.1)O3 (LKNNT) thick films. In the second part, lead-free Li0.058(K0.48Na0.535)0.966(Nb0.9Ta0.1)O3 (LKNNT) powder was prepared by the solid-state reaction method, and then acetic acid (C2H4O2) solvent was added to form a slurry for spin-coating technology processing. The fabrication parameters, thick film micro-structure, crystalline properties, nano-indention technology, and the piezoelectric coefficient characteristics of the developed lead-free Li0.058(K0.48Na0.535)0.966(Nb0.9Ta0.1)O3 (LKNNT)/Pt/Ti/Si structure of the micro-pressure thick film devices a were investigated. According to the experimental results, the optimal fabrication processing parameters of the lead-free Li0.058(K0.48Na0.535)0.966(Nb0.9Ta0.1)O3 (LKNNT) were an RTA temperature of 500 °C, a Ti buffer-layer thickness of 273.9 nm, a Pt bottom electrode-layer thickness of 376.6 nm, a theoretical density of LKNNT of 4.789 g/cm3, a lattice constant of 3.968 × 10−8 cm, and a d33 value of 150 pm/V. Finally, regarding the mechanical properties of the micro-pressure devices for when a microforce of 3 mN was applied, the thick film revealed a hardness of 60 MPa, a Young’s modulus of 13 GPa, and an elasticity interval of 1.25 μm, which are suitable for future applications of micro-pressure devices.

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34

Eka Putri, Nabila Anjani y Sukaris Sukaris. "OPTIMALISASI LAYANAN POSAJA DAN FREE PICK UP SERVICE TERHADAP KEPUASAN PELANGGAN". Jurnal Ilmiah Ekonomi Manajemen Jurnal Ilmiah Multi Science 13, n.º 2 (5 de diciembre de 2023): 70–80. http://dx.doi.org/10.52657/jiem.v13i2.1909.

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Perkembangan teknologi yang semakin pesat, mengharuskan perusahaan untuk bertindak dengan cepat dan tepat agar tidak kalah saing dengan perusahaan lainnya. Begitu pula dengan PT Pos Indonesia (Persero), yang merupakan salah satu BUMN di Indonesia juga diharuskan melakukan optimalisasi pelayanan agar tidak kalah dengan pesaing lainnya. Penelitian ini bertujuan untuk mengetahui optimalisasi layanan PosAja dan free pickup service terhadap kepuasan pelanggan di PT Pos Indonesia (Persero) Kantor Cabang Utama Jember. Penelitian ini dilakukan dengan pendekatan kualitatif dengan pengambilan data menggunakan teknik wawancara. Hasil penelitian menunjukkan bahwa optimalisasi yang dilakukan oleh PT Pos Indonesia (Persero) terhadap para pelanggannya sudah cukup baik, sehingga mulai banyak perusahaan yang bekerja sama dengan PT Pos Indonesia (Persero) untuk pengiriman dokumen dan barang, akan tetapi PT Pos Indonesia (Persero) harus terus meningkatkan layanan agar tidak ketinggalan dengan perusahaan jasa pengiriman barang lainnya.

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35

Tang, Jason M., Kurt Jensen, Wenzhen Li, Mahesh Waje, Paul Larsen, Palanisamy Ramesh, Mikhail E. Itkis, Yushan Yan y Robert C. Haddon. "Carbon Nanotube Free-Standing Membrane of Pt/SWNTs as Catalyst Layer in Hydrogen Fuel Cells". Australian Journal of Chemistry 60, n.º 7 (2007): 528. http://dx.doi.org/10.1071/ch06411.

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A simple and promising fuel-cell architecture is demonstrated using a carbon nanotube free-standing membrane (CNTFSM) made from Pt supported on purified single-walled carbon nanotubes (Pt/SWNT), which act as the catalyst layer in a hydrogen proton exchange membrane fuel cell without the need for Nafion in the catalyst layer. The CNTFSM made from Pt/SWNT at a loading of 0.082 mg Pt cm–2 exhibits higher performance with a peak power density of 0.675 W cm–2 in comparison with a commercially available E-TEK electrocatalyst made of Pt supported on XC-72 carbon black, which had a peak power density of 0.395 W cm–2 at a loading of 0.084 mg Pt cm–2 also without Nafion in the catalyst layer.

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36

Tang, Yongfu, Teng Chen y Wenfeng Guo. "Surfactant-Free Synthesis of Reduced Graphene Oxide Supported Well-Defined Polyhedral Pd-Pt Nanocrystals for Oxygen Reduction Reaction". Catalysts 9, n.º 9 (9 de septiembre de 2019): 756. http://dx.doi.org/10.3390/catal9090756.

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Well-defined polyhedral Pd-Pt nanocrystals anchored on the reduced graphene oxide (rGO) are successfully synthesized via a facile and efficient surfactant-free solvothermal route. The formation mechanism is carefully illustrated via tuning the surface state of rGO substrate and the Pd/Pt ratio in Pd-Pt nanocrystals. rGO substrates with continuous smooth surface, which can offer continuous 2D larger π electrons, play important roles in the formation of the well-defined polyhedral Pd-Pt nanocrystals. Suitable Pd/Pt ratio, which determines the affinity between the rGO substrate and polyhedral Pd-Pt nanocrystals, is another important factor for the formation of polyhedral Pd-Pt nanocrystals. Due to the well-defined surface of Pd-Pt nanocrystals, rich corners and edges from polyhedral structure, as well as more exposed (111) facets, the low-Pt polyhedral Pd-Pt nanocrystals anchored on rGO, used as electrocatalysts, exhibit high electrocatalytic activity for oxygen reduction reaction with excellent methanol tolerance.

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37

Fernández-Navarro, Carlos y Sergio Mejía-Rosales. "Molecular Dynamics of Free and Graphite-Supported Pt-Pd Nanoparticles". Advances in Nanoparticles 02, n.º 04 (2013): 323–28. http://dx.doi.org/10.4236/anp.2013.24044.

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38

Stadlhofer, A., M. Bodner, H. Schrottner y V. Hacker. "Pt-Free Catalysts for Alkaline Direct Ethanol Membrane Electrode Assemblies". ECS Transactions 50, n.º 2 (15 de marzo de 2013): 1927–32. http://dx.doi.org/10.1149/05002.1927ecst.

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39

Poelsema, Bene, Klaus Lenz y George Comsa. "The dissociative adsorption of hydrogen on defect-‘free’ Pt(111)". Journal of Physics: Condensed Matter 22, n.º 30 (13 de julio de 2010): 304006. http://dx.doi.org/10.1088/0953-8984/22/30/304006.

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40

Lee, Yi-Jae, Jung-Doo Kim y Jae-Yeong Park. "Enzymeless Free-Cholesterol Detection on Macroporous Au with Pt Nanoparticles". Sensor Letters 9, n.º 1 (1 de febrero de 2011): 188–91. http://dx.doi.org/10.1166/sl.2011.1446.

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41

Luo, W. B., P. Zhang, Y. Shuai, X. Q. Pan, Q. Q. Wu, C. G. Wu, C. Yang y W. L. Zhang. "Forming free resistive switching in Au/TiO2/Pt stack structure". Thin Solid Films 617 (octubre de 2016): 63–66. http://dx.doi.org/10.1016/j.tsf.2016.01.019.

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42

Liu, Shu-xia y Jun-hui He. "Template-free fabrication of macroporous carbon materials with Pt nanoparticles". Carbon 45, n.º 15 (diciembre de 2007): 2–3. http://dx.doi.org/10.1016/j.carbon.2007.09.023.

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43

Bai, Yu, Yingying Sun y Changqing Sun. "Pt–Pb nanowire array electrode for enzyme-free glucose detection". Biosensors and Bioelectronics 24, n.º 4 (diciembre de 2008): 579–85. http://dx.doi.org/10.1016/j.bios.2008.06.003.

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44

Álvarez-Docio, C. M., R. Portela, J. J. Reinosa, F. Rubio-Marcos, C. Granados-Miralles, L. Pascual y J. F. Fernández. "Pt-free CoAl2O4 catalyst for soot combustion with NOx/O2". Applied Catalysis A: General 591 (febrero de 2020): 117404. http://dx.doi.org/10.1016/j.apcata.2019.117404.

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45

Huang, Shenwei, Matthew Johnson y Daniël Paulusma. "Narrowing the Complexity Gap for Colouring (Cs, Pt)-Free Graphs". Computer Journal 58, n.º 11 (8 de junio de 2015): 3074–88. http://dx.doi.org/10.1093/comjnl/bxv039.

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46

Roiron, Camille, Caroline Celle, Marie Heitzmann, Pierre-André Jacques y Jean-Pierre Simonato. "One-Pot Synthesis of Pt-Free 3D-Catalyst for PEMFC". ECS Meeting Abstracts MA2020-01, n.º 46 (1 de mayo de 2020): 2666. http://dx.doi.org/10.1149/ma2020-01462666mtgabs.

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47

Zheng, Jingjing. "Pt-free NiCo electrocatalysts for oxygen evolution by seawater splitting". Electrochimica Acta 247 (septiembre de 2017): 381–91. http://dx.doi.org/10.1016/j.electacta.2017.07.024.

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48

Sfaelou, S., M. Antoniadou, G. Trakakis, V. Dracopoulos, D. Tasis, J. Parthenios, C. Galiotis, K. Papagelis y P. Lianos. "Buckypaper as Pt-free cathode electrode in photoactivated fuel cells". Electrochimica Acta 80 (octubre de 2012): 399–404. http://dx.doi.org/10.1016/j.electacta.2012.07.046.

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49

Alam, Md Zafir, B. Srivathsa, S. V. Kamat, V. Jayaram y D. K. Das. "Microtensile testing of a free-standing Pt-aluminide bond coat". Materials & Design 32, n.º 3 (marzo de 2011): 1242–52. http://dx.doi.org/10.1016/j.matdes.2010.10.003.

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50

Tasic, Gvozden S., Scepan S. Miljanic, Milica P. Marceta Kaninski, Djordje P. Saponjic y Vladimir M. Nikolic. "Non-noble metal catalyst for a future Pt free PEMFC". Electrochemistry Communications 11, n.º 11 (noviembre de 2009): 2097–100. http://dx.doi.org/10.1016/j.elecom.2009.09.003.

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