采用循环伏安法,研究了0.25 mol/L TaCl5在离子液体1-丁基-3-甲基咪唑六氟磷酸盐([Bmim] PF6)中的电化学行为.实验结果表明,电沉积钽是受扩散控制、两步骤的不可逆电极反应过程,首先是Ta(Ⅴ)还原为Ta(Ⅲ),其次是Ta(Ⅲ)还原为金属钽和形成其它低价钽氯化物.Ta(Ⅴ)/Ta(Ⅲ)和Ta(Ⅲ)/Ta在离子液体[Bmim] PF6中的阴极传递系数分别为0.155和0.406.Ta(Ⅴ)在离子液体[Bmim] PF6中的扩散系数为1.629×10-9 cm2/s.在100℃和-1.25 V条件下,采用恒电势法在铂片上电沉积钽,扫描电子显微镜照片和EDS分析表明,沉积物为钽和钽的低价氯化物.
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