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本文用循环伏安法和现场红外光谱方法研究了铜电极上CN~-和SCN~-的电化学行为。对于0.5mol~(-1)L~(-1)NaCN+0.5mol L~(-1)NaF/Cu体系,电极电势在-1.60至0.30V(相对SCE)范围内,2030—2230cm~(-1)范围内可得到三个吸收峰,位置分别为2076,2094和2170cm~(-1)。2076和2170cm~(-1)峰分别对应于溶液中CN~-和表面沉积难溶化合物CuCN。2094cm~(-1)峰是吸附态CN~-和溶液中配合物Cu(CN)_3~2二物种的红外吸收叠加。对于0.5molL~(-1)NaSCN+0.5molL~(-1)NaF/Cu体系,在上述电势范围内可得到2060,2177和2170cm~(-1)三个红外吸收峰,分别对应于溶液中的SCN~-,吸附态的SCN~-和表面难溶化合物CuNCS。
In this paper, the electrochemical behavior of CN ~ - and SCN ~ - at copper electrode was investigated by cyclic voltammetry and field infrared spectroscopy. For the 0.5 mol L -1 NaCN + 0.5 mol L -1 NaF / Cu system, the potential of the electrode was in the range of -1.60 to 0.30 V (relative SCE), and the range of 2030-2230 cm ~ (- 1), there are three absorption peaks at 2076, 2094 and 2170 cm -1, respectively. The peaks of 2076 and 2170 cm ~ (-1) correspond to CN ~ - in the solution and CuCN on the surface. The 2094 cm -1 peak is the infrared absorption superposition of Cu (CN) _3 ~ 2 complexes in adsorbed CN ~ - and solution. For the 0.5 molL ~ (-1) NaSCN + 0.5 molL ~ (-1) NaF / Cu system, three infrared absorption peaks of 2060, 2177 and 2170 cm ~ (-1) were obtained in the above potential range, Of SCN ~ -, adsorbed SCN ~ - and surface insoluble compounds CuNCS.