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首页> 外文期刊>Journal of solid state electrochemistry >Preparation of a cobalt hexacyanoferrate film-modified aluminum electrode by chemical and electrochemical methods: ethanced stability of the electrode in the presence of phosphate and ruthenium(III)
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Preparation of a cobalt hexacyanoferrate film-modified aluminum electrode by chemical and electrochemical methods: ethanced stability of the electrode in the presence of phosphate and ruthenium(III)

机译：通过化学和电化学方法制备六氰合铁酸钴薄膜修饰的铝电极：在磷酸盐和钌（III）存在下电极的稳定稳定性

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摘要

Modification of an aluminum electrode by means of a thin film of cobalt hexacyanoferrate (CoHCF) using electroless and electrochemical procedures is described. The modification conditions of the aluminum surface, including the electroles deposition of metallic cobalt on the electrode surface from CoCl_2 + NaF solution and the chemical derivatization of the deposited cobalt to give a CoHCF film in 0.25 M KCl + 0.25 M K_3[Fe(CN)_6] solution, have been determined. The modified Al electrodes prepared under optimum conditions show one or two well-defined redox couples in phosphate buffer solutions of pH 7.2, depending on the preparation procedure, due to the [Co~(II)Fe~(III/II)(CN)_6]~(2-) system. The effect of pH, alkali metal cations, and anions of the supporting electrolyte on the electrochemical characteristics of the modified electrode were studied. Diffusion coefficients of hydrated Na~+ in the film, the transfer coefficient, and the transfer rate constant for electrons were determined. The stability of the modified electrodes under various experimental conditions was studied and their high stability in the sodium phosphate buffer solutions was confirmed. Enhanced stability was observed when the modfiied electrode was scanned in fresh solutions of RuCl_3 between 0 and 1 V for at least 20 cycles, due to the formation of mixed hexacyanoferrates of cobalt and ruthenium.
机译：描述了利用无氰和电化学方法通过六氰合铁酸钴（CoHCF）薄膜对铝电极的改性。铝表面的改性条件，包括电极上从CoCl_2 + NaF溶液中金属钴的电极沉积，以及沉积后的钴的化学衍生，得到0.25 M KCl + 0.25 M K_3 [Fe（CN）的CoHCF膜_6]解决方案，已经确定。在最佳条件下制备的改性铝电极在pH 7.2的磷酸盐缓冲溶液中显示一到两个明确定义的氧化还原对，具体取决于制备过程，这是由于[Co〜（II）Fe〜（III / II）（CN） _6]〜（2-）系统。研究了pH，碱金属阳离子和支持电解质的阴离子对修饰电极电化学特性的影响。测定了水合Na〜+在薄膜中的扩散系数，传输系数和电子的传输速率常数。研究了改性电极在各种实验条件下的稳定性，并证实了它们在磷酸钠缓冲溶液中的高稳定性。当在0和1 V之间的RuCl_3的新鲜溶液中扫描修饰的电极至少20个循环时，观察到增强的稳定性，这是由于形成了钴和钌的混合六氰合铁酸盐。

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