Electrodeposition of Palladium and Adsorption of Palladium Chloride onto Solid Electrodes from Room Temperature Molten Salts
Electrodeposition of Palladium and Adsorption of Palladium Chloride onto Solid Electrodes from Room Temperature Molten Salts
复制标题
室温熔盐中钯的电沉积和氯化钯在固体电极上的吸附
DOI：
10.1149/1.2054831
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发表时间：
1994
影响因子：
3.9
通讯作者：
R. T. Carlin
中科院分区：
文献类型：
--
作者：
H. Long;J. Wilkes;R. T. Carlin
研究了在室温AlCl[sub 3]-MEIC熔盐中钯在各种电极表面上的电沉积，其中AlCl[sub 3]摩尔分数N从0.33 < N < 0.5（碱性熔体）到0.5 < N < 0.67（酸性熔体）和N = 0.5（中性熔体）。钯的电沉积行为明显依赖于熔盐中AlCl[sub 3]的摩尔分数。当熔体从碱性变为酸性时，钯还原电位移动约+2.0 V。成核过电位是明显的，在碱性熔体中，并在较小程度上在酸性和中性熔体。在酸性熔体中，还原的难溶性钯配合物显示出独特的吸附现象的特点，而氧化过程显示出相当大的拓宽。钯电极在N = 0.55酸性熔体中的氧化在电极表面上产生不溶性氯化钯层（近似单层），其保护下面的金属免于进一步氧化。这种表面锚定的氯化钯层的还原是快速的，并提供高阴极电流密度。酸性熔体中的这种行为明显不同于碱性熔体中的还原过程，其中可溶性钯氯络合物的还原更接近于具有成核效应的扩散波。«少
The electrodeposition of palladium onto various electrode surfaces was examined in room temperature AlCl[sub 3]-MEIC molten salts with AlCl[sub 3] mole fractions, N, from 0.33 < N < 0.5 (basic melts) to 0.5 < N < 0.67 (acidic melts) and at N = 0.5 (neutral melt). The behavior of palladium electrodeposition was markedly dependent on the mole fraction of AlCl[sub 3] in the molten salts. The palladium reduction potential shifts approximately +2.0 V when the melt is changed from basic to acidic. Nucleation overpotentials were evident in basic melts, and to a lesser extent in acidic and neutral melts. In acidic melts, the reduction of the sparingly soluble palladium complex displays characteristics distinctive of an adsorption phenomenon, while the oxidation process shows considerable broadening. Oxidation of a palladium electrode in an N = 0.55 acidic melt produces an insoluble palladium chloride layer (approximately a monolayer) on the electrode surface which protects the underlying metal from further oxidation. Reduction of this surface anchored palladium chloride layer is rapid and provides a high cathodic current density. This behavior in acidic melts in pointedly different from the reduction process in a basic melt where the reduction of the soluble palladium chloro complex exhibitsmore » a diffusion wave with nucleation effects.« less