Catalytic Activity of Iridium Dioxide With Different Morphologies for Oxygen Reduction Reaction  

作　　者：汪广进 HUANG Fei XU Tian YU Yi CHENG Feng ZHANG Yue 潘牧 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology [2]Hubei Provincial Key Laboratory of Fuel Cell [3]College of Chemistry and Materials Science, Hubei Engineering University [4]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

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2015年第5期882-887,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Major State Basic Research Development Program of China(973 Program)(No.2012CB215504);the National Natural Science Foundation of China(No.50632050);the Doctoral Fund of Ministry of Education of China(No.20130143130001);Hubei Provincial Key Laboratory of Fuel Cell(2015FCJ001)

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 Ir O2 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.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 Ir O2 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.

关 键 词：Iridium dioxide modified sol-gel method Adams method oxygen reduction reaction 

分 类 号：TQ138.25[化学工程—无机化工] O643.36[理学—物理化学]