| Electrochemical kinetics of gold dissolving in alkaline thiourea solution |
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| 作者姓名： | 柴立元 王云燕 |
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| 作者单位： | School of Metallurgical Science and Engineering Central South University，School of Metallurgical Science and Engineering Central South University，Changsha 410083 China Changsha 410083 China |
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| 摘 要： | 1 INTRODUCTIONEssentially , determination of electrode reac-tion mechanism is just the determination of thecourse of electrode reaction and the rate-determi-ning step1 5]. Based on the previous results6 11],gold dissolution mechanism undergoes the follow-ing courses in alkaline thiourea solution: adsorp-tion of thiourea on active points of electrode sur-face and formation of AuSC(NH2)2]ads; chargetransfer fromactive gold atomto thiourea moleculeand formation of AuSC(NH2)2]a+ds; Au-…
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| 关 键 词： | 碱性硫脲 电化学动力学 金 溶解 |
| 文章编号： | 1005-9784（2006）05-0477-04 |
| 收稿时间： | 2006-06-20 |
| 修稿时间： | 2006-08-26 |
Electrochemical kinetics of gold dissolving in alkaline thiourea solution |
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| Chai Li-yuan,and Wang Yun-yan.Electrochemical kinetics of gold dissolving in alkaline thiourea solution[J].Journal of Central South University of Technology,2006,13(5):477-480. |
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| Authors: | Chai Li-yuan and Wang Yun-yan |
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| Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, 410083 Changsha, China |
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| Abstract: | Kinetic parameters of the electrode reactions were measured by investigating steady-state current-potential behaviors. The
results show that the apparent transfer coefficient of anodic process is 0.0582, diffusion coefficient of thiourea gold complex
is 6.04 × 10−6 cm2/s, anodic reaction order of thiourea is 2.0183, and anodic reaction order of OH− is 0.0166. The theoretical kinetics equation of gold dissoving in alkaline thiourea solution is deduced, which indicates
that anodic reaction order of thiourea is 2, and anodic reaction order of OH− is 0. The theoretical values of the kinetic parameters are consistent with experimental values very well. The correctness
of the mechanism is further demonstrated using apparent transfer coefficient according to the electrochemical dynamic equation
of multi-electron reaction.
Foundation item: Project (50004009) supported by the National Natural Science Foundation of China |
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| Keywords: | gold alkaline thiourea electrochemical kinetics |
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