Grain Size Effect of IrO_2 Nanocatalysts for the Oxygen Evolution Reaction  

作　　者：HU Wei CHEN Shengli 

机构地区：[1]College of Chemistry and Chemical Engineering, Hubei University [2]Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University

出　　处：《Wuhan University Journal of Natural Sciences》2013年第4期289-294,共6页武汉大学学报（自然科学英文版）

基　　金：Supported by the National Natural Science Foundation of China(21073137);National Basic Research Program of China(2012CB932800)

摘　　要：Combined with air annealing, rutile-structured IrO 2 nanoparticles with various sizes were prepared using colloidal method. The nanoparticles were used as the electrocatalysts for the oxygen evolution reaction （OER） in acidic media, and their grain size effect was studied. The results show that with the increase in annealing temperature, the grain size of the catalyst increases, and the voltammetric charges （the electroactive areas） and apparent activity for the OER decrease. The relationship between the intrinsic activity and the annealing temperature exhibits a volcano-type curve and the catalyst annealed at 550 ℃ achieved the best result.Combined with air annealing, rutile-structured IrO 2 nanoparticles with various sizes were prepared using colloidal method. The nanoparticles were used as the electrocatalysts for the oxygen evolution reaction （OER） in acidic media, and their grain size effect was studied. The results show that with the increase in annealing temperature, the grain size of the catalyst increases, and the voltammetric charges （the electroactive areas） and apparent activity for the OER decrease. The relationship between the intrinsic activity and the annealing temperature exhibits a volcano-type curve and the catalyst annealed at 550 ℃ achieved the best result.

关 键 词：acidic water electrolysis oxygen evolution reaction IrO 2 size effect voltammetric charges catalytic activity 

分 类 号：O646.542[理学—物理化学]