IrO2-SiO2 binary oxide films: Geometric or kinetic interpretation of the improved electrocatalytic activity for the oxygen evolution reaction

doi:10.1016/j.ijhydene.2011.01.131

IMR OpenIR

	IrO2-SiO2 binary oxide films: Geometric or kinetic interpretation of the improved electrocatalytic activity for the oxygen evolution reaction
	Zhang, Jia-Jia 1; Hu, Ji-Ming 1; Zhang, Jian-Qing 1,2; Cao, Chu-Nan 1,2
通讯作者	Hu, Ji-Ming(kejmhu@zju.edu.cn)
	2011-05-01
发表期刊	INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
ISSN	0360-3199
卷号	36 期号:9 页码:5218-5226
摘要	Our previous paper (Electrochim Acta 2010; 55: 4587-4593) reported that doping silica, the largest reserved oxide in the world, significantly improved the apparent electrochemical activity of Ti/IrO2 electrodes for oxygen evolution reaction (OER). In the present work, the electrochemical surface structure of Ti/IrO2 SiO2 composite electrodes and the reaction kinetics of the OER thereon are investigated in details, to deeper understand the positive role of silica incorporation. Both the cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements indicate either "inner" or "outer" active surface area of the mixed oxide electrodes, which is quantified by the voltammetric charge (q*) or by the double-layer capacitance (C-dl), constantly increases when increasing the silica content therein under the investigated range of Ir/Si molar ratio. The "porosity", defined as the ratio of the "inner" to "total" surface area, of the binary oxide films exhibits much higher values than pure IrO2 film. Although the apparent electrocatalytic activity for the OER at composite electrodes is obviously higher than that at IrO2 electrode, the real surface area-normalized activity declines after silica incorporation. The kinetic rate constants of the OER, approximated from the normalized polarization curves, also show dramatically decreased values at silica-doped electrodes. The above-mentioned results suggest that the enhanced apparent electrocatalytical activity of silica-doped IrO2 electrodes might be merely a result of geometric effect. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
关键词	IrO2 electrode SiO2 doping Electrochemical surface structure Electrocatalytic activity
资助者	NSFC ; Zhejiang Provincial Natural Science Foundation of China ; Qianjiang Talent Program of Zhejiang Province ; Fundamental Research Funds for the Central Universities
DOI	10.1016/j.ijhydene.2011.01.131
收录类别	SCI
语种	英语
资助项目	NSFC[50871101] ; Zhejiang Provincial Natural Science Foundation of China[Z4100016] ; Qianjiang Talent Program of Zhejiang Province[2010R10046] ; Fundamental Research Funds for the Central Universities[2010QNA3007]
WOS研究方向	Chemistry ; Electrochemistry ; Energy & Fuels
WOS类目	Chemistry, Physical ; Electrochemistry ; Energy & Fuels
WOS记录号	WOS:000290883100002
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：69[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/106704
专题	中国科学院金属研究所
通讯作者	Hu, Ji-Ming
作者单位	1.Zhejiang Univ, Dept Chem, Hangzhou 310027, Peoples R China 2.State Key Lab Corros & Protect, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Jia-Jia,Hu, Ji-Ming,Zhang, Jian-Qing,et al. IrO2-SiO2 binary oxide films: Geometric or kinetic interpretation of the improved electrocatalytic activity for the oxygen evolution reaction[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2011,36(9):5218-5226.
APA	Zhang, Jia-Jia,Hu, Ji-Ming,Zhang, Jian-Qing,&Cao, Chu-Nan.(2011).IrO2-SiO2 binary oxide films: Geometric or kinetic interpretation of the improved electrocatalytic activity for the oxygen evolution reaction.INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,36(9),5218-5226.
MLA	Zhang, Jia-Jia,et al."IrO2-SiO2 binary oxide films: Geometric or kinetic interpretation of the improved electrocatalytic activity for the oxygen evolution reaction".INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 36.9(2011):5218-5226.