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The Study of Pt/MWNTs and PtCo/C Electrodes for PEMFC Prepared with In-Situ Method

Author: ZhangSheng
Tutor: YinGePing
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: Proton exchange membrane fuel cell Carbon nanotubes In situ ion exchange Electrodeposition
CLC: TM911.48
Type: Master's thesis
Year: 2007
Downloads: 168
Quote: 1
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Abstract


The working principle of the proton exchange membrane fuel cell (PEMFC) and progress overview and describes the proton exchange membrane fuel cell cathode preparation methods ; situ ion exchange the prepared electrode process function process of electrode the impact of the performance , while improving the Pt deposition process ; explore situ prepared PtCo alloy electrode process . The gas diffusion electrode for the preparation of multi-walled carbon nanotubes (MWNTs) , electrochemical oxidation , nitric acid oxidation and dual oxidation method functionalizing treatment . Treated functionalized MWNTs surface composition analysis by X-ray photoelectron spectroscopy (XPS) , spectroscopy (EDAX) and electron microscopy (TEM) characterization of Pt nanoparticles , characterized by cyclic voltammetry (CV) curves and polarization curves electrode performance . Compared with other functional method , after the surface of the electrode after the processing of the dual oxidation containing group most carboxyl functional group content of the highest. In situ ion-exchange method can be successfully achieved Pt nanoparticles deposited MWNTs electrode , Pt MWNTs uniformly dispersed , the particle diameter of about 4.0nm , concentrated nitric acid oxidation treatment after the first electrochemical oxidation prepared Pt / MWNTs electrode (EC2 Pt loading ), maximum (16.4mass%). Electrochemical tests show : EC2 electrode electrochemical activity of the largest , highest activity for the oxygen reduction reaction . The reason is that the processing surface of MWNTs produced up to a carboxyl functional group in the electrochemical activity bit , by ion exchange after the deposition of Pt . Pt / C electrode was prepared by in situ ion exchange , and Pt deposition process improvements . Electrochemical reduction in carbon black carrier deposition Pt, compared to hydrogen reduction , both prepared Pt / C electrode electrochemical area close to the catalyst particle size quite . The electrochemical reduction method has the advantage of high efficiency, low cost, is suitable for mass production . Prepared by the method of combining the use of ion exchange and electrodeposition PT - skin structure PtCo / C electrode . The electrode to improve the catalytic activity for the oxygen reduction reaction was . The reason is that this special catalyst weaken the structure of the Pt on the H2O activation process generated O , OH Adsorption provide more Pt active sites for the oxygen reduction reaction , thereby improving the catalytic activity for the oxygen reduction reaction . Provide a new idea for the preparation of high-performance PEMFC cathode .

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell > Ion-exchange membrane fuel cell
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