Dissertation > Excellent graduate degree dissertation topics show

Studies on the Stability of Catalyst Based on Conductive Nano-Ceramic Supports for PEMFC

Author: LvHaiFeng
Tutor: MuShiChun
School: Wuhan University of Technology
Course: Materials Science
Keywords: PEMFC Catalyst Nano-Ceramic Supports Durability
CLC: TM911.4
Type: Master's thesis
Year: 2011
Downloads: 45
Quote: 0
Read: Download Dissertation

Abstract


Pt-based catalysts are usually employed as anode and cathode catalysts in proton exchange membrane fuel cell (PEMFC). However, carbon supports in PEMFCs are under strongly oxidizing conditions:high water content, low pH (<1), high temperature (50-90℃), high potential (0.6-1.2 V versus Reversible Hydrogen Electrode, RHE), high oxygen concentration can be oxidized to CO or CO2. The insufficient stability of catalysts remains a major obstacle to the widespread commercialization of PEMFCs. The homogeneously dispersed Pt nanoparticles were deposited on the surface of ceramic support using an ethylene glycol reduction method. The structure, performance and durability of the prepared catalysts were characterized by TEM, XRD, CV and ADT. The experimental results and conclusions are summarized as following:1) nano-SiC ceramic and ZrO2-C have almost no change in the redox region after oxidation treatment for 48 h, which means there are negligible surface oxides. Contrarily, there are visible current peaks in the redox region for Vulcan XC-72, resulting from the surface oxide formation due to the hydroquinone-quinone (HQ-Q) redox couple on the carbon black surface These results indicate that nano-SiC and ZrO2-C are more resistant to electrochemical oxidation than Vulcan XC-72;2) The HRTEM images demonstrate that Pt nanoparticles are successfully deposited and homogeneously dispersed on the novel supports with a particle size of-3 nm, indicating that the introduced ceramic as novel support of Pt nanoparticles is extraordinarily successful;3) The CV results show our catalysts have good catalytic activity, The ECSA of Pt/SiC/C and Pt/ZrO2-C catalysts are close to the traditional Pt/C, and the ECSA of Pt/B4C is higher than Pt/C with a improved CO-tolerant performance;4) Based on ADT and HRTEM, the electrochemical stability of the novel catalysts were remarkably enhanced compared with the Pt/C catalysts, after ADT, a lot of Pt nanoparticles detached from the surface of carbon, in contrast, slight agglomeration of Pt particles is observed for the ceramic support, there is still a large number of Pt particles remaining on the ceramic surfaces.This study supplies a possibility to prepare an advanced catalyst with high electrocatalytic performance and stability by using nano ceramic materials as supports.

Related Dissertations

  1. The Experimental Research on Regeneration Aggregate and Proportioning of Recycled Concrete Brick,TU528
  2. Study on the Procees for the Preparation of Prohexadione and Its Analogs,TQ452
  3. Study on Using Sepiolite As Supported Catalysts in Selective Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol,O643.32
  4. The Preparation of Polyaniline-Metal Complex and the Study on Its Catalytical Property,O634
  5. Synthesis and Characterization of Monovalent, Divalent Imidazolium Ionic Liquids Containing Hydrocarbons,O621.3
  6. Pt -based catalysts of direct methanol fuel cells,TM911.4
  7. The Study of Anode Catalyst Pd/C for Direct Formic Acid Fuel Cell,O643.36
  8. Study on the Synthesis of the Polypyrrole-Cobalt Oxides and Their Catalytic Behavior for the Electroreduction of H2O2,O643.32
  9. The Basicity of MO/ZrO2 Catalyst and Their Use in the Synthesis of 2-Ethyl-Hexyl Carbonate,O623.662
  10. Application of Charcoal Loaded Catalyst for Treatment of Organic Pollutants,X703
  11. Controllable Synthesis of Carbon Nanotubes Supported Metall Nanocatalysts and the Study on Their Electrocatalysis,O643.36
  12. Synthesis of 1,4-Butynediol from HCHO and C2H2 Over CuO-Bi2O3/MgO-SiO2,TQ223.162
  13. Research on Fuel Gas Production from Catalytic Gasification of Municipal Solid Wastes,X799.3
  14. PtRh / Pt 5 / C Catalyst Preparation, Characterization and Electrocatalytic Oxidation of Ethanol,TM911.4
  15. Epoxidation of olefins with high activity cobalt zeolite catalysts,O643.32
  16. MCM-41 as aryl oxime palladium catalyst and catalytic Suzuki coupling reaction of aryl,O643.36
  17. Nano Pt / SiC Preparation, Characterization and Electrochemical Catalytic Performance,TM911.4
  18. Synthesis of t- butyl alcohol using tert-butylbenzene, the catalyst selection and research,TQ241.1
  19. Dynamic Simulation and Fatigue Durability Analysis of Wheel Loader Worktool,TH243
  20. Synthesis and Responsive Behavior of Amphiphilic Azobenzene Functionalized Block Copolymers,O631.3
  21. Asymmetric Michael Addition of 5H-Oxazol-4-ones to α,β-Unsaturated Ketones Catalyzed by Novel Primary Amine Catalyst,O621.25

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