武汉理工大学学报-材料科学版(英文版),
2015, (5): 882-887.
doi: 10.1007/s11595-015-1244-0
WANG Guangjin
1,
, HUANG Fei
2,
, XU Tian
3,
, YU Yi
4,
, CHENG Feng
5,
, ZHANG Yue
6,
, PAN Mu
7,
1.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
2.Sericultural & Agri-food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China
3.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
4.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
5.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
6.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
7.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
基金项目:
the Major State Basic Research Development Program of China (973 Program)(2012CB215504)
Hubei Provincial Key Laboratory of Fuel Cell (2015FCJ001). Authors thank Dr. Li Wenyao (Donghua University) for his technical help
the Doctoral Fund of Ministry of Education of China(20130143130001)
the National Natural Science Foundation of China(50632050)
Catalytic Activity of Iridium Dioxide With Different Morphologies for Oxygen Reduction Reaction
Keywords：
Iridium dioxide
Iridium dioxide with different morphologies (nanorod and nanogranular) is successfully prepared by a modiifed 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.
