文献类型： 外文期刊

作者： Wang Guangjin ¹ ; Huang Fei ⁴ ; Xu Tian ¹ ; Yu Yi ¹ ; Cheng Feng ¹ ; Zhang Yue ¹ ; Pan Mu ¹ ;

作者机构： 1.Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

2.Hubei Prov Key Lab Fuel Cell, Wuhan 430070, Peoples R China

3.Hubei Engn Univ, Coll Chem & Mat Sci, Xiaogan 432000, Peoples R China

4.Guangdong Acad Ag

关键词： Iridium dioxide;modified sol-gel method;Adams method;oxygen reduction reaction

期刊名称：JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION （ 影响因子：0.957； 五年影响因子：0.959 ）

ISSN： 1000-2413

年卷期： 2015 年 30 卷 5 期

页码：

收录情况： SCI

摘要： Iridium dioxide with different morphologies (nanorod and nanogranular) is successfully prepared by a modified sol-gel and Adams methods. The catalytic activity of both samples for oxygen reduction reaction is investigated in an alkaline solution. The electrochemical results show that the catalytic activity of the nanogranular IrO2 sample is superior to that of the nanorod sample due to its higher onset potential for oxygen reduction reaction and higher electrode current density in low potential region. The results of Koutecky-Levich analysis indicate that the oxygen reduction reaction catalyzed by both samples is a mixture transfer pathway. It is dominated by four electron transfer pathway for both samples in high overpotential area, while it is controlled by two electron transfer process for both samples in low overpotential area.