期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 167, 期 2, 页码 -出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ab6b07
关键词
-
资金
- National Natural Science Foundation of China [21972118, 21703183, 21373172, 21621091]
Alkaloid hypoxanthine is a novel complexant for green cyanide-free Au(III) electrodeposition. In this work, the electrochemical and coordination behaviors of hypoxanthine-Au(III) ion in the green cyanide-free bath are studied. The electrochemical behavior confirms that hypoxanthine-Au(III) ion is in the irreversible two-step electro-reductions with the first controlled by diffusion and the second by diffusion and electrochemistry. The stability constant of hypoxanthine-Au(III) ion is 4.8 x 10(30). DFT calculations further indicate that the optimal coordination structure is N3-Au-N7 with the N-Au average bond energy of 11.03 eV. The bath component of potassium citrate plays almost no influence, whereas the additive of sulfocompounds shows a significant effect on the electro-reduction of hypoxanthine-Au(III) ion. Based on the cyanide-free Au(III) electrodeposition bath, the obtained gold coating is fine and compact in grains without organic inclusion and in the resistivity of 2.84 x 10(-8) Omega.m. (C) 2020 The Electrochemical Society (ECS). Published on behalf of ECS by IOP Publishing Limited.
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