IrO2-SiO2 binary oxide films: Geometric or kinetic interpretation of the improved electrocatalytic activity for the oxygen evolution reaction
文献类型：期刊论文
| 作者 | Zhang, Jia-Jia1; Hu, Ji-Ming1; Zhang, Jian-Qing1,2; Cao, Chu-Nan1,2 |
| 刊名 | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
 |
| 出版日期 | 2011-05-01 |
| 卷号 | 36期号:9页码:5218-5226 |
| 关键词 | IrO2 electrode SiO2 doping Electrochemical surface structure Electrocatalytic activity |
| ISSN号 | 0360-3199 |
| DOI | 10.1016/j.ijhydene.2011.01.131 |
| 通讯作者 | Hu, Ji-Ming(kejmhu@zju.edu.cn) |
| 英文摘要 | 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. |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000290883100002 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | NSFC ; Zhejiang Provincial Natural Science Foundation of China ; Qianjiang Talent Program of Zhejiang Province ; Fundamental Research Funds for the Central Universities |
| 源URL | [http://ir.imr.ac.cn/handle/321006/106703]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。