Indirect Electrochemical Cr(III) Oxidation in KOH Solutions at an Au Electrode: The Role of Oxygen Reduction Reaction
文献类型：期刊论文
| 作者 | Jin, Wei1,3; Moats, Michael S.2; Zheng, Shili1; Du, Hao1; Zhang, Yi1; Miller, Jan D.2 |
| 刊名 | JOURNAL OF PHYSICAL CHEMISTRY B
 |
| 出版日期 | 2012-06-28 |
| 卷号 | 116期号:25页码:7531-7537 |
| 关键词 | ALKALINE-SOLUTIONS CHROMIUM(III) HYDROXIDE HYDROGEN-PEROXIDE MECHANISM SOLUBILITY KINETICS GOLD SURFACE WATER SUPEROXIDE |
| ISSN号 | 1520-6106 |
| 通讯作者 | Du, H |
| 英文摘要 | The indirect electro-oxidation of Cr(III) by in situ generated superoxide at a gold electrode has been investigated in KOH solutions using cyclic voltammetry and UV-vis spectroscopy. It is observed that the indirect Cr(III) oxidation behavior is substantially affected by the media pH and there is a pH-modulated oxygen reduction reaction (ORR) process to generate reactive oxygen species which promotes Cr(III) oxidation. The ORR in KOH solutions is attributed to a quasi-reversible diffusion-controlled reaction. In dilute KOH solution (0.2 M), 4e reduction occurs and no reactive oxygen species are generated for the indirect Cr(III) oxidation. Moreover, Cr(III) oxidation is inhibited due to competition for the electrode active sites. As the alkaline concentration increases (3.0 M), the protonation of superoxide is greatly suppressed, and thus, le ORR to generate superoxide is observed. This change in mechanism facilitates the indirect Cr(III) oxidation through the superoxide as a mediator to oxidize Cr(III) to Cr(IV), which is the rate-determining step of Cr(III) oxidation to Cr(VI). |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Chemistry, Physical |
| 研究领域[WOS] | Chemistry |
| 关键词[WOS] | ALKALINE-SOLUTIONS ; CHROMIUM(III) HYDROXIDE ; HYDROGEN-PEROXIDE ; MECHANISM ; SOLUBILITY ; KINETICS ; GOLD ; SURFACE ; WATER ; SUPEROXIDE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000305769700016 |
| 公开日期 | 2013-10-16 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/3574]  |
| 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. Indirect Electrochemical Cr(III) Oxidation in KOH Solutions at an Au Electrode: The Role of Oxygen Reduction Reaction[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2012,116(25):7531-7537. |
| APA | Jin, Wei,Moats, Michael S.,Zheng, Shili,Du, Hao,Zhang, Yi,&Miller, Jan D..(2012).Indirect Electrochemical Cr(III) Oxidation in KOH Solutions at an Au Electrode: The Role of Oxygen Reduction Reaction.JOURNAL OF PHYSICAL CHEMISTRY B,116(25),7531-7537. |
| MLA | Jin, Wei,et al."Indirect Electrochemical Cr(III) Oxidation in KOH Solutions at an Au Electrode: The Role of Oxygen Reduction Reaction".JOURNAL OF PHYSICAL CHEMISTRY B 116.25(2012):7531-7537. |
入库方式： OAI收割
来源：过程工程研究所
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