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本文用电化学方法和非现场红外反射吸收光谱方法研究了CN~-和SCN~-水溶液中Cu电极上膜的形成及其结构,对于0.5mol·l~(-1)NaSCN+0.5mol·l~-1NaF/Cu体系,在-0.50到0.20伏(相对SCE)范围内形成的表面膜给出2157～2162cm~-1的红吸收峰;在-0.20至0.40伏则得到2177cm~-1峰。这表明在不同电势下生成的硫氰化铜表面膜的结构不同,对于0.5mol·l~(-1)NaCN+0.5mol·l~-1NaF/Cu体系,在0.00至0.40伏电势范围内,可得到两个吸收峰,波数分别为2128和2170cm~-1,对应于Cu(CN)_2~-和CuCN,此二峰强度基本同步地随电势改变,表明不同电势下表面膜的结构基本相同。
In this paper, the electrochemical method and off-site infrared absorption spectroscopy were used to study the formation and structure of Cu on Cu electrode in CN ~ - and SCN ~ - aqueous solutions. For 0.5 mol·L -1 NaSCN + 0.5 mol·L ~ -1 NaF / Cu system, the surface film formed in the range of -0.50 to 0.20 volts (relative SCE) gives a red absorption peak of 2157 to 2162 cm -1 and a peak of 2177 cm -1 in the range of -0.20 to 0.40 volts. This indicates that the surface structures of thiocyanate copper films formed at different potentials are different. For the 0.5 mol·L -1 NaCN + 0.5 mol·L -1 NaF / Cu system, in the potential range of 0.00 to 0.40 V, Two absorption peaks were obtained, the wave numbers were 2128 and 2170 cm -1, corresponding to Cu (CN) _2 ~ - and CuCN, respectively. The peak intensities of the two peaks changed with the potentials, indicating that the structures of the surface films were basically the same under different potentials .