Dissertation > Excellent graduate degree dissertation topics show

Preparation and Electrocatalysis Research of Pt Based Ordered Intermetallic Compounds

Author: LangJunShan
Tutor: HuangChengDe
School: Tianjin University
Course: Applied Chemistry
Keywords: direct alcohol fuel cells ordered intermetallic compound small organic molecular electro-oxidation thin film electrode rotating disk electrode
CLC: TM911.4
Type: Master's thesis
Year: 2008
Downloads: 75
Quote: 1
Read: Download Dissertation

Abstract


Direct alcohol fuel cells, the fuels of which are small organic molecules such as methanol, ethanol, isopropanol and formic acid are the new types of low temperature fuel cells. However, the poisoning of the anode electrocatalysts has affected performance and service life of fuel cells. The preparation of PtPb、PtSn、PtBi ordered intermetallic compounds is studied in this paper, and the electrochemical performance of these compounds is researched in the solutions of ethanol and formic acid. The compositions and particle sizes of the prepared composite catalysts were characterized by XRD.The results showed that the quantity of polyvinylpyrrolidone (PVP) as a polymer stabilizer, the temperature of reaction and the ratio of atom had the varying degree influence to the electrocatalysts preparation during the process of preparing PtPb, PtSn, PtBi ordered intermetallic compounds using the alcohol-reduction method.In the electro-oxidation reaction of ethanol, when the quantity of PVP is 170mg, and the temperature of reaction is 170℃, the PtPb/C catalyst with the Pt/Pb atomic ratios of 1:1 in the solution had the best performance. During the process of preparing the PtSn/C ordered intermetallic compound, the degrees of orderliness of the PtSn alloy increased with the increase of the quantity of PVP in some degree. It had affected the electrocatalytic performance of the PtSn/C catalyst, and the best quantity of PVP was 170mg. The temperature of reaction also had the influence to the catalytic activity for electro-oxidation of the PtSn/C catalyst. And the best reacting temperature was 240℃. The electrocatalytic performance of the PtSn/C catalyst was increased with the quantity of Pt in the solution. The best the best atomic ratios of Pt/Sn was 3:1. Compared the performance test of the PtSn/C catalyst with that of the commercial Pt/C in the solutions of ethanol and formic acid, it found that the properties of the PtSn/C catalyst were improved in some degree. At the room temperature, when the quantity of PVP is 100mg, and the Pt/Bi atomic ratios were 1:3, the catalytic activity for the ethanol electro-oxidation of the PtSn/C catalyst has the best performance.In the solutions of ethanol and formic acid, the electrochemical impedance spectroscopy of those catalysts was studied. New equivalent circuit was presented to fit the experimental electrochemical impedance spectroscopy. The electrode reaction mechanism of PtPb/C, PtSn/C and PtBi/C catalysts was investigated in the solutions of ethanol and formic acid. For the first time, the electrode reaction mechanism of PtPb/C, PtSn/C and PtBi/C catalysts was investigated by the rotating disk electrode in the solutions of ethanol.

Related Dissertations

  1. Chemically Modified Boron-Doped Diamond Thin Film Electrode Nitrite Detect Nitrite,O613.61
  2. Preparation and Properties of Ti-based TiO2, SnO2 Electrodes,O646.5
  3. Preparation and Characerization of （Co,Ba）-Doped MnO2 Thin-Film Electrode,TB383.4
  4. Preparation and Electrochemical Performance of Pt Based Binary Alloy Catalysts,O643.36
  5. Study on Preparation and Application of Ultra-high Concentration Organic Wastewater Treatment by BDD Thin Film Electrode,X703
  6. Preparation and Electrocatalysis Research of Electrocatalysts of Direct Oxidated Fuel Cells,TM911.4
  7. Measurement of Organic Compounds in Aqueous Solution with Ti/TiO2 Thin Film Electrode,O657.1
  8. The Application of Electroless Deposition and Electrodeposition in Separating Chemistry,O657.1
  9. The Research of the Neuro-Stimulating Microelectrodes for Visual Prosthesis,R318
  10. Preparation and Electrocatalysis of Carbon-supported Pd and Pd-Pt Alloy Nanoparticle Catalysts,O643.36
  11. Kinetic and Mechanistic Studies of the Oxygen Reduction Reaction on Pt Electrode,TM911.4
  12. Synthesis, Characterization of Ordered Mesoporous Carbon Based Composites and Their Electrocatalytic Studies in Direct Alcohol Fuel Cells,TM911.4
  13. Study on Electrocatalysts Modified by Organics for Direct Alcohol Fuel Cells,TM911.4
  14. Electrochemical Preparation of Highly Active TiO2/SiO2 Composite Film and Its Application in Photoelectrocatalytic Degradation,X132
  15. Studies on the Os～(2+)/Os～(3+) Redox Polymer Thin Film Modifeid Electrodes and Their Applications in Biosensing,O657.1
  16. Study on Fabrication of LiMO2 Thin-film Electrodes by Hydrothermal-electrochemical Method,TM911
  17. Studies on Thin Film Electrodes Containing Phthalocyanines/Porphyrins and Redox Proteins,O646.5
  18. Finite-Element Analysis of Resistivity Measurement with Four Probe Method in a Diamond Anvil Cell,O521
  19. Application of Nano-sized Materials Fabricated by Porous Anodic Alumina Template,TB383.1
  20. Numerical Analysis of Flow Process in a Molten Carbonate Fuel Cell,TM911.4
  21. Fabrication of Membrane Electrode Assembly for PEMFC,TM911.4

CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
© 2012 www.DissertationTopic.Net  Mobile