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IrO2-SiO2 binary oxide films: Geometric or kinetic interpretation of the improved electrocatalytic activity for the oxygen evolution reaction
Zhang, Jia-Jia1; Hu, Ji-Ming1; Zhang, Jian-Qing1,2; Cao, Chu-Nan1,2
Corresponding AuthorHu, Ji-Ming(kejmhu@zju.edu.cn)
2011-05-01
Source PublicationINTERNATIONAL JOURNAL OF HYDROGEN ENERGY
ISSN0360-3199
Volume36Issue:9Pages:5218-5226
AbstractOur 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.
KeywordIrO2 electrode SiO2 doping Electrochemical surface structure Electrocatalytic activity
Funding OrganizationNSFC ; Zhejiang Provincial Natural Science Foundation of China ; Qianjiang Talent Program of Zhejiang Province ; Fundamental Research Funds for the Central Universities
DOI10.1016/j.ijhydene.2011.01.131
Indexed BySCI
Language英语
Funding ProjectNSFC[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 Research AreaChemistry ; Electrochemistry ; Energy & Fuels
WOS SubjectChemistry, Physical ; Electrochemistry ; Energy & Fuels
WOS IDWOS:000290883100002
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:47[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/106704
Collection中国科学院金属研究所
Corresponding AuthorHu, Ji-Ming
Affiliation1.Zhejiang Univ, Dept Chem, Hangzhou 310027, Peoples R China
2.State Key Lab Corros & Protect, Shenyang 110016, Peoples R China
Recommended Citation
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.
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