Dissertation > Excellent graduate degree dissertation topics show

Study on Electrocatalytic Performance of Porous Silicon Electrode and Its Application

Author: TianJuan
Tutor: ZhangBaoHong
School: Harbin Engineering University
Course: Applied Chemistry
Keywords: Porous silicon Pt nanoparticles Cyclic voltammetry Miniature proton exchange membrane fuel cell
CLC: O646.54
Type: Master's thesis
Year: 2007
Downloads: 162
Quote: 0
Read: Download Dissertation

Abstract


In recent years, with the rapid development of the mobile phone, personal digital assistant (PDA), notebook computers and other portable electronic products, made of micro energy increasing demands, MH-Ni battery and lithium-ion batteries can not meet the their high energy demand, therefore, the research and development of new micro energy attracted great attention. Miniature proton exchange membrane fuel cell (PEMFC) has the characteristics of the environment-friendly, high energy conversion efficiency and high specific energy, it is possible to meet this demand, miniaturization has aroused great interest in the study, especially silicon-based micro- The fuel cell has become a hotspot in the field of micro fuel cells. In order to improve the utilization of the catalyst, the shorter the diffusion path of the species and to reduce transmission resistance, this article using porous silicon as a diffusion layer, of the microcomputer of the PEMFC of electrodeposition on the porous silicon by cyclic voltammetry Pt nanoparticles used as a catalytic electrode, The adsorption and desorption of hydrogen and methanol oxidation as a probe, and evaluation of its catalytic properties, and preliminary testing of the performance of the porous silicon micro PEMFC micro PEMFC porous silicon electrodes made technical exploration. Through the the controllable preparation process on the porous silicon, the system had an average pore diameter was approximately 350nm, 500 nm and 750nm, about 40% of the porosity of the hole depth is 50 ~ 60μm of the porous silicon film is suitable for micro-PEMFC. Compared with the brush wears, electro-deposition of Pt nanoparticles modified electrode with high Pt utilization and strong electrocatalytic activity. Diameter about 7nm the Pt nanoparticles uniformly dispersed in the surface of porous silicon, the Pt loading of 0.38mg · cm -2 electrochemical active surface area up to 148cm 2 · mg -1 , brush similar to the quality of nano-catalyst of Pt / C electrocatalyst times: The modified electrode also showed enhanced catalytic performance and better stability for methanol oxidation, The current density in the polarization 0.5V (vs SCE) for 1h 4.52mA · cm -2 , while brushing a similar Pt Pt / C electrode current density of only 0.36mA · cm -2 . Electrodeposition of Pt nanoparticles modified porous silicon electrode is used as a cathode, an aperture respectively 5μm and 350nm of the porous silicon micro PEMFC peak power density of 5.8mW · cm -2 and 7.5mW · cm -2 , the result is better than reported in the literature.

Related Dissertations

  1. Study on Electrochemistry and Raman Spectrum of Picoline Electro-Oxidation Beavior in Non-aqueous System,O626.321
  2. Electrochemical Studies on Interaction between ApoCopC、BSA and Cu(Ⅱ)、Cu(Ⅰ)、Cd(Ⅱ)、Ag(Ⅰ),O646
  3. The Fabrication and Application of the Preanodized Inlaying Ultrathin Carbon Paste Film Electrode,O657.1
  4. Nano Pt / SiC Preparation, Characterization and Electrochemical Catalytic Performance,TM911.4
  5. Electrochemical Behavior and Simultaneous Determination of Multi-Pollutants at BDD Electrode,X132
  6. Preparation and Application of Complex Oxide Coated Nano-electrode for the Oxidation of Pollutants,X505
  7. The Tin Oxide array electrode preparation and electrochemical properties of the anode as lithium,TM911.1
  8. Surface deposition of copper thin film of porous silicon , Preparation and luminescence characteristics of,TB383.4
  9. Electrodeposited Rare Earth-Iron Group Magnetic Films and Their Magnetism,TB383.2
  10. Syntheses and Properties of Calix "4" Arene Derivatives with Ferrocene Groups,O627.81
  11. Studies on the Properties of Organized Assemblies in Mixtures of CTAB/SDS Surfactants System by Cyclic Voltammetry,O647.2
  12. Research of Electrophoresis Chip Amperometric Detection Key Technology,O657.8
  13. Power Generation of Sediment Nicrobial Fuel Ceel Based on Substrates Types,TM919
  14. Study on Thermal and Mechanical Properties of Porous Silicon Thermal Isolation Layer Used in Uncooled Infrared Microbolometer,TN215
  15. The Electrochenmistry of Rusticyanin,Q51
  16. Study on Electrochemical Electrode Behavior of Nitrobenzene Compouds,X756
  17. The copper electrowinning new lead-based alloy anode Preparation and properties of,TF811
  18. Study on Preparation and Performance of Polypyrrole/Carbon Nanotube Composites,TB383.1
  19. The Synthesis and Characterization of Polyaniline Nanofibers,TB383.1
  20. Studies on the Electrochemical Properties of PANI/REmOn （RE=La, Ce） Nanocomposites and the Catalysis of Pt Electrode Modified by Them to the Oxidization of CH3OH and HCOOH,TB33
  21. Study on Conductivity of PANI/Nd2O3 Nanocomposites and the Catalysis of Pt Electrode Modified by Them,TB302

CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Electrochemical,electrolytic,magnetic,chemical > Electrolysis and Electrode role > Electrode process
© 2012 www.DissertationTopic.Net  Mobile