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Time-differential frequency response of electrochemical quartz crystal electrode during the dissolution and deposition processes of Au in H2SO4 solution containing chloride ion |
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| Authors: | Taku Oyama Shuichiro Yamaguchi Takeyoshi Okajima Takeo Ohsaka Noboru Oyama |
| Institution: | 1. Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259-G1-5 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan;2. Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan |
| Abstract: | Time-differentiation of the frequency response observed with electrochemical quartz crystal microbalance (EQCM) was applied for the analysis of the electrode processes for the Au electro-dissolution and deposition in acidic aqueous solution containing free chloride ion (Cl−). Evaluation for the values of the apparent equivalent molar mass per second proved the generation of the Au(I) species during the oxidation and reduction reactions of Au electrode in the presence of Cl− at a level of 10 mM, which has not been reported so far. It was found that the electron-transfer reactions composed of Au(0), Au(I) and Au(III) species are participated in the overall Au electro-dissolution and deposition reactions in the applied potential range from −0.10 to 1.50 V (vs. Ag/AgCl). |
| Keywords: | Time-differentiation Quartz crystal micro-balance Au electro-dissolution and deposition Au(I) chloride species |
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