Effect of Heated-treating Temperature on the Electrocatalysis of Oxygen Reduction for Carbon Black-supported CoTMPP/BP2000

Abstract

Abstract:

Carbon black-supported cobalt tetramethoxyphenylporphyrin CoTMPP/BP2000 was prepared as cathode electrocatalyst for the oxygen reduction in proton exchange membrane fuel cell(PEMFC).The effect of various heated-treating temperature from 200 ℃ to 900 ℃ on the electrocatalytic activities for oxygen reduction of CoTMPP/BP2000 were investigated by cyclic voltammogram(CV) and Koutecky-Levich plot.Results show that the heat-treatment can enhance the catalytric activity and stability of the catalyst, 900 ℃ is found to be the most suitable temperature.The influence of heate-treating temperature of CoTMPP/BP2000 was analyzed by UV-Vis, TEM, IR, TG and XPS methods. Results reveal that heated-treatment can change the central structure of catalyst, the porphyrin ring and Co—N₄ band of the catalyst can not exited with and after 400 ℃ heat-treatment.The most stable Co—N_x—C structure was formed with 900 ℃ heat-treatment, this new active site can efficiently improve the catalytic ability of oxygen reduction of CoTMPP/BP2000.

Key words: Heat-treatmemt, CoTMPP/BP2000, Cyclic voltammogram, Oxygen reduction, Fuel cell

CLC Number:

O643
O614

TrendMD:

WANG Ai-Qin, REN Qi-Zhi*, LIU Shuang-Yan, MA Xiao-Xia, XIE Xian-Yu. Effect of Heated-treating Temperature on the Electrocatalysis of Oxygen Reduction for Carbon Black-supported CoTMPP/BP2000[J]. Chem. J. Chinese Universities, 2009, 30(4): 752.

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