Influence of preparation process on non-noble metal-based composite electrocatalysts for oxygen reduction reaction

被引：16

作者：

Deng, Xuanying ^{[1
,2
]}

Wang, Xin ^{[1
]}

Ma, Zi-Feng ^{[2
]}

机构：

[1] Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 637459, Singapore

[2] Shanghai Jiao Tong Univ, Dept Chem Engn, Shanghai, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2008年 / 183卷 / 02期

基金：

美国国家科学基金会;

关键词：

non-noble electrocatalyst; oxygen reduction reaction; proton-exchange membrane fuel cell; tetramethoxy-phenylporphyrin;

D O I：

10.1016/j.jpowsour.2008.03.092

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Composite electrocatalysts based on the transition metal cobalt are synthesized for the oxygen reduction reaction (ORR) by mechanically mixing three basic precursors containing carbon black, cobalt acetate and tetramethoxy-phenylporphyrin (TMPP). The influence of various mixing processes, solvents, pyrolysis temperature and precursor ratios on the ORR activity of the electrocatalysts is investigated by means of their electrochemical characteristics. Levich-Koutecky plots show that the number of transferred electrons during ORR on these catalysts varies between 2 and 4. A pyrolyzed mixture synthesized by ultrasonication exhibits better activity for ORR than that prepared by ball milling. The solvent is found to have a significant effect on the performance of the catalysts in acidic media. The catalyst synthesized in water, a poor solvent of TMPR has better activity than that synthesized in a good solvent of TMPP. such as N,N-dimethylformamide and acetic acid. The optimum pyrolysis temperature is 600 degrees C. Various mole ratios and Co/carbon weight ratios are examined. Maximum activity is found at a 1: 1 TMPP/Co mole ratio and a 5% Co/carbon weight ratio. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：604 / 608

页数：5

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