Modulated Cr(III) oxidation in KOH solutions at a gold electrode: Competition between disproportionation and stepwise electron transfer
文献类型：期刊论文
| 作者 | Jin, Wei1,2,3; Moats, Michael S.2; Zheng, Shili1; Du, Hao1; Zhang, Yi1; Miller, Jan D.2 |
| 刊名 | ELECTROCHIMICA ACTA
 |
| 出版日期 | 2011-10-01 |
| 卷号 | 56期号:24页码:8311-8318 |
| 关键词 | Cr(III) oxidation KOH Mechanism transition pH dependent Competitive adsorption |
| ISSN号 | 0013-4686 |
| 通讯作者 | Du, H |
| 英文摘要 | The electrochemical oxidation of aqueous Cr(III) was examined using cyclic voltammetry with a polycrystalline Au electrode in KOH solutions of varying pH and Cr(III) concentration. The mechanism and kinetics for the oxidation of Cr(III) is a quasi-reversible diffusion-controlled reaction and is largely dependent on the solution pH. The reaction mechanism is initiated by an irreversible electrochemical electron transfer to form Cr(IV) which is the rate-determining step (RDS). Following the RDS, subsequent oxidation of Cr to its hexavalent state occurs by the disproportionation of Cr(IV) at low KOH concentrations and electron transfer at high KOH concentrations due to the involvement of OH(-) in the disproportionation reaction. As the solution pH increases, the Cr(III) oxidation peak potential shifts negatively owing to the involvement of OH(-) in the RDS. The competitive adsorption of OH(-) and CrO(2)(-) on the electrode surface also plays an important role in the oxidation behavior. (C) 2011 Elsevier Ltd. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Electrochemistry |
| 研究领域[WOS] | Electrochemistry |
| 关键词[WOS] | TRIVALENT CHROMIUM ; HEXAVALENT CHROMIUM ; AQUEOUS CHROMIUM(IV) ; REACTION-MECHANISM ; REDUCTION ; SURFACE ; SOILS ; POLAROGRAPHY ; ADSORPTION ; SPECIATION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000295601600029 |
| 公开日期 | 2013-10-30 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/4382]  |
| 专题 | 过程工程研究所_湿法冶金清洁生产技术国家工程实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China 2.Univ Utah, Dept Met Engn, Salt Lake City, UT 84112 USA 3.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jin, Wei,Moats, Michael S.,Zheng, Shili,et al. Modulated Cr(III) oxidation in KOH solutions at a gold electrode: Competition between disproportionation and stepwise electron transfer[J]. ELECTROCHIMICA ACTA,2011,56(24):8311-8318. |
| APA | Jin, Wei,Moats, Michael S.,Zheng, Shili,Du, Hao,Zhang, Yi,&Miller, Jan D..(2011).Modulated Cr(III) oxidation in KOH solutions at a gold electrode: Competition between disproportionation and stepwise electron transfer.ELECTROCHIMICA ACTA,56(24),8311-8318. |
| MLA | Jin, Wei,et al."Modulated Cr(III) oxidation in KOH solutions at a gold electrode: Competition between disproportionation and stepwise electron transfer".ELECTROCHIMICA ACTA 56.24(2011):8311-8318. |
入库方式： OAI收割
来源：过程工程研究所
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