Dissertation > Excellent graduate degree dissertation topics show

Direct formic acid fuel cell Carbon Au-based composite cathode catalyst

Author: ChenWei
Tutor: LuTianHong
School: Nanjing Normal University
Course: Physical and chemical
Keywords: Direct formic acid fuel cell Oxygen reduction Au / C catalyst The carbon contained tetraphenyl cobalt porphyrin catalysts Tetraphenyl cobalt porphyrin -Au / C catalyst Ir / C catalyst Au-Ir / C catalyst PVA Protection Act Tetrahydrofuran complex reduction method
CLC: TM911.47.550
Type: Master's thesis
Year: 2008
Downloads: 192
Quote: 1
Read: Download Dissertation

Abstract


Gradually found more than a decade of research and direct methanol fuel cell (DMFC) anode catalyst performance, easy to poisoning, methanol and easy through the Nafion membrane, methanol toxic, in the near future is difficult to achieve commercialization. Discovered in recent years, such as formic acid as the fuel direct formic acid fuel cell (DFAFC) has many advantages than DMFC. For example, formic acid and methanol by two orders of magnitude lower than the permeability of the Nafion membrane. Although formic acid on the Nafion membrane permeability is very low, but there is always the penetration of a small part of the formic acid to the cathode and oxidized at the cathode, so that the decline in the performance of the cathode. Therefore, the study of oxygen reduction in an important direction of the high electrocatalytic activity and high formic acid tolerance of the cathode catalyst DFAFC research. However, in addition to articles published by our research group, there is no research reports of the the DFAFC cathode catalyst. In the DMFC cathode catalyst is usually Pt, Pd or Pt-Pd-based composite catalyst, but has a good electrocatalytic activity of Pt and Pd oxidation of formic acid, so they are not suitable for use as a cathode catalyst in DFAFC. Therefore, it is necessary to study the new the DFAFC the cathode catalyst. In this thesis, the The DFAFC carbon contained Au and Au-based composite cathode catalyst preparation method examines the impact and mechanism of Au and Au-based cathode composite catalyst composition and structure factors electrocatalytic properties for oxygen reduction and formic acid oxidation. Main results are as follows: 1. Protection prepared with polyvinyl alcohol (PVA) and Au / C catalyst of Au particles have an average particle size and relative degree of crystallinity than with pre-prepared by precipitation of the Au / C catalyst is much smaller, so PVA protection prepared Au / C catalyst has a higher electrochemical activity for the oxygen reduction. Also found that the electrocatalytic activity of Au / C catalyst for oxidation of formic acid is not, therefore, Au / C catalyst has a high resistance to formic acid. 2. Carbon contained the tetraphenyl cobalt porphyrin (CoTPP / C) catalyst at 600 ℃ heat treatment, the better electrocatalytic activity for the oxygen reduction in non-heat-treated CoTPP / C catalyst. At the same time, also for the first time found CoTPP / C catalyst not only no electrocatalytic activity for oxidation of formic acid and formic acid also slightly increases the heat treatment CoTPP / C catalyst for the oxygen reduction electrocatalytic activity. 3 prepared PVA-protection method, the CoTPP-Au / C catalyst Au average particle diameter is small, the relatively low degree of crystallinity, particle size distribution, the formed N signing CoTPP heat treatment 4 - The synergistic catalytic Co conjugates between, cause the CoTPP-Au / C catalyst for the oxygen reduction electrocatalytic activity is much higher than the CoTPP / C and Au / C catalyst. At the same time, it is found that the CoTPP-Au / C catalyst nor electrocatalytic activity of formic acid oxidation, therefore, CoTPP-Au / C catalyst is an oxygen reduction catalysts have higher electrocatalytic activity and high formic acid tolerance. 4 with tetrahydrofuran (THF) complex reduction method were Au-Ir Au and Ir / C catalyst can not form an alloy, Au exists in the face-centered cubic crystal structure, but exists in an amorphous, IR. Au / C, Ir / C and Au-Ir / C catalyst for oxidation of formic acid is basically no electrocatalytic activity. Au and Ir catalysis of oxygen reduction synergies between the electro-catalytic activity of Au-Ir / C catalyst for oxygen reduction is far better than the Ir / C and Au / C catalyst.

Related Dissertations

  1. Pt -based catalysts of direct methanol fuel cells,TM911.4
  2. Catalytic Study of Hydrogen Peroxide Synthesis Directly from H2 and O2,TQ123.6
  3. Preparation and Properties of Platinum-based Catalysts for Potential Use in PEMFCs,TM911.4
  4. Carbon Au -based low temperature fuel cell anode catalyst electrochemical properties,TM911.4
  5. Study on the Anode Catalyst of the Direct Methanol Fuel Cells,TM911.4
  6. Bifunctional air electrode type used perovskite oxide catalytic materials research,O643.36
  7. Regulation of Shape, Structure and Electrochemical Properties of Pd and Pd/Au Core-Shell Metal Nanoparticles,TB383.1
  8. Synthesis, Structure and Properties of Two-Dimensional Polyphthalocyanine and Its Derivatives,O631.3
  9. Direct formic acid fuel cell Pd anode catalyst electrocatalytic stability difference mechanism,TM911.4
  10. Synthesis and Characterization of Catalysts for Proton Exchange Membrane Fuel Cell,TM911.4
  11. An Investigation on Preparation and Property of Manganese Dioxide–polymer Composite Material by Cyclic Voltammetry,TB33
  12. Preparation and Electrochemical Behavior of Graphitized Carbon Black/Platiunm Nanohybrid Catalyst,O643.36
  13. Determination of the Real Surface Area of Polycrystalline Pt and Pd electrodes and Preliminary Study of the Oxygen Reduction Reaction Activity of Pd@Pt Electrodes,O646.54
  14. Applied to the fuel cell , metal / polymer composite catalytic materials,TM911.4
  15. Carbon loading of cobalt phthalocyanine catalyst preparation and oxygen reduction catalytic properties of,O643.36
  16. Platinum- palladium alloy films (electric) chemical vapor deposition and electro-catalytic infrared spectroscopy,O643.36
  17. The basic research of the lithium- air battery,TM912
  18. The Simulation of the PtNi Catalyst and Carbon Carrier,TM911.4
  19. Preparation of Au/La-Mn-O Catalysts and Its Catalytic Activity for CO Oxidation,O643.36
  20. Studies on Oxygen Reduction Reaction of Pt/C Electro-catalyst Modified by Fe3O4,TM911.4
  21. CNT direct methanol fuel cell catalysts containing platinum-based electricity,TM911.4

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