Dissertation > Excellent graduate degree dissertation topics show

Investigation on the Stability of Pt/Carbon Nanotube Catalysts and Novel Methods for the Preparation of the Electrodes for PEMFC

Author: ShaoYuYan
Tutor: YinGePing；GaoYunZhi
School: Harbin Institute of Technology
Course: Applied Chemistry
Keywords: proton exchange membrane fuel cell electrocatalysts carbon nanotube durability in-situ ion exchange
CLC: TM911.48
Type: PhD thesis
Year: 2006
Downloads: 898
Quote: 2
Read: Download Dissertation

Abstract


Proton exchange membrane fuel cells (PEMFC) have been receiving increasing attention due to its high energy efficiency and being environmentally friendly. However, PEMFCs’wide application and commercialization is hindered by two serious issues: poor durability or short life time, and high cost. Carbon nanotubes (CNT) are new promising materials of catalyst supports for PEMFCs. Previous studies reveal that CNTs supported catalysts show enhanced catalytic activity towards oxygen reduction reaction (ORR) and methanol oxidation.The effect of their diamters on the electrochemical stability of CNTs is investigated and CNTs with the diameter between 10~20 nm (D1020) show the most strong resistance to electrochemical oxidation among all the investigated CNTs. So it is selected in the following work. The electrochemical stability of CNTs and Vulcan XC-72 carbon black is investigated using an accelerated degradation test (ADT) by applying a fixed potential of 1.2 V (vs. reversible hydrogen electrode, RHE) on the two electrodes in 0.5 mol·L-1 H2SO4 for 120 h at room temperature. Cyclic voltammetry (CV) and X-ray Photoelectron Spectroscopy (XPS) analysis show that more surface oxygen is formed on the surface of Vulcan XC-72 during the electrochemical oxidation under the same conditions, which indicates that CNTs are more resistant to electrochemical oxidation than Vulcan XC-72. The strong stability of CNTs is attributed to their specific structures.The electrochemical stability of Pt/CNT and Pt/Vulcan XC-72 is investigated by applying a constant potential of 1.2 V on the two electrodes in 0.5 mol·L-1 H2SO4 for 192 h (8 days) at room temperature. Transmission Electron Microscope (TEM) images show that the sintering of Pt nanoparticles is more pronounced for Pt/Vulcan XC-72 than that for Pt/CNT. XPS analysis indicates that the oxidation degree of Vulcan XC-72 is higher than that of CNTs. The electrochemical surface area (ESA) of Pt/Vulcan XC-72 electrode decreases by 49.8% after ADT, while only 26.1% for Pt/CNT, which means that PT/CNT is more stable than Pt/Vulcan XC-72 under electrochemical operation. The enhanced stability of Pt/CNT is attributed to the specific interaction between Pt nanoparticles and CNTs and CNTs’high stability under electrochemical conditions. The electrochemical stability of Pt/CNT is closely

Related Dissertations

  1. Fabrication of Membrane Electrode Assembly for PEMFC,TM911.4
  2. The Experimental Research on Regeneration Aggregate and Proportioning of Recycled Concrete Brick,TU528
  3. Dynamic Simulation and Fatigue Durability Analysis of Wheel Loader Worktool,TH243
  4. Growth of Single-walled Carbon Nanotube Arrays and the Study of Their Adhesion Force,TB383.1
  5. Preparation and Properties of Platinum-based Catalysts for Potential Use in PEMFCs,TM911.4
  6. Effects on Physiological Metabolism and Fermentation of Saccharomyces Cerevisiae with Proteinase A Deletion,X792
  7. Stainless steel fuel cell bipolar plate and its experimental and simulation,TM911.4
  8. Study on Preparation and Performance Tests of Gypsum-based Phase Change Materials,TB34
  9. Preparation of Fe3O4-MWCNTs Nanocomposites by Microwave Assisted Polyol Method and Their MRI Enhancement Properties,TB383.1
  10. PVA fiber concrete damage evolution acoustic emission monitoring and destructive mechanism,TU528.572
  11. Grey Theory in the durability of concrete application,TU375
  12. Quick card connector push back mechanism Improvement of durability,TM503.5
  13. CNT surface metal electrode implantation method and its application technology research,TB383.1
  14. Port engineering design of concrete structures to determine the useful life,U653
  15. Research on Durability Evaluation Method of Cement Concrete Pavement,U416.216
  16. Performance of Shotcrete for Infrastructure Rehabilitation in Cold Regions,U414
  17. Research on the Surface Properties and Durability of Surface Texture of Cement Concrete Pavement,U416.216
  18. Study of Field Emission Properties of Printed Carbon Nanotube Films,TB383.1
  19. Mg-Ni Electrochromics Functional Films Fabricated by Electrodeposition and Their Properties,TB383.2
  20. Preparation of soluble single-walled carbon nanotubes,TB383.1
  21. Frost resistance of concrete cooling tower,TU528

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