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Preparation and Electrocatalytic Performance Study of Cobalt-polypyrrole/carbon-based Cathode Catalysts for Oxygen Reduction in Proton Exchange Membrane Fuel Cells

Author: ZengZuo
Tutor: YuanXianXia
School: Shanghai Jiaotong University
Course: Chemical Engineering and Technology
Keywords: Oxygen reduction Electro-catalyst Polypyrrole (PPy) P-toluenesulfonic acid (TsOH) Cobalt
CLC: TM911.4
Type: Master's thesis
Year: 2010
Downloads: 184
Quote: 1
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Abstract


Slow oxygen reduction kinetics and precious metal catalyst cost , inefficient use of limited cathode oxygen -reduction catalyst has become one of the main factors in the commercialization of the the constraints proton exchange membrane fuel cell (PEMFC) . Polypyrrole (PPy) the class transition metal catalyst , due to its special structure and the unique nature of the molecular oxygen exhibit excellent catalytic activity and stability , is expected to replace the precious metals become PEMFC cathode oxygen reduction catalysts , and in recent years become an academic subject of the focus of attention . In this thesis, in situ polymerization the the PPy modified C ( PPy / C ) , and infrared spectroscopy , Raman spectroscopy , SEM characterization and analysis of the combination between PPy and C ; then the composite carrier combined with cobalt salt , Co - PPy / C catalyst was prepared by high temperature heat treatment , comparative study of the heat treatment temperature , time , protective atmosphere of Co-PPy / C structure and oxygen reduction catalytic properties , optimization of the catalyst Co- PPy / C during the preparation process conditions. In order to further improve the oxygen reducing catalytic performance of the Co-PPy / C , the paper is the use of p-toluenesulfonic acid (TsOH) as a dopant system to obtain a catalyst Co-PPy-TsOH / C, the oxygen reducing catalytic activity than Co -ppy / C significantly improve its performance as a cathode catalyst of the PEMFC is greatly improved, than the Co-PPy / C as catalyst for PEMFC cathode Co loading of 0.35mg/cm2, without backpressure conditions , the maximum power density of more than 200mW/cm2, as 1atm back pressure is applied to achieve more than 250 mW/cm2 , far beyond the highest level currently can be found in the literature reported similar catalyst . The paper also uses simultaneous thermal analysis , high temperature in situ XRD, Raman spectroscopy , elemental analysis and TEM analysis TsOH modified Co-PPy / C mechanism . Finally, this paper analyzed using Minitab Method amount of TsOH of doping and the amount of pyrrole catalyst Co-PPy-TsOH / C performance .

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