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采用循环伏安法、旋转金盘电极和库仑电解等方法研究了金在酸性硫脲(TU)溶液中的阳极溶解过程。提出了金的阳极溶解机构。认为表面的Au(TU)_(ads)~+的“化学溶解”步骤是过程的控制步骤。由此解释了旋转金盘电极的极化曲线出现电流峰以及金的溶解速度出现极大的原因。
The anodic dissolution of gold in acid thiourea (TU) solution was studied by cyclic voltammetry, rotating gold disk electrode and coulomb electrolysis. A gold anodic dissolution mechanism was proposed. The “chemical dissolution” step of the surface Au (TU) _ (ads) ~ + is considered to be a control step of the process. This explains why the polarization curve of the rotating gold disk electrode has a current peak and the rate of dissolution of gold is extremely large.