Abstract Prussian blue analogues (PBAs) have been recently investigated as promising electrode materials for battery and supercapacitor applications. While most explorations have focused on PBA nanoparticles, very little attention has been focused on PBA films deposited on a metallic support. In this work, we have examined electrogenerating hexacyanoferrate (HCF) and hexacyanoruthenate (HCR) films on nickel surfaces via cyclic voltammetry. We found that the total material deposited was influenced by the metal cation present in the electrolyte solution and that, on average, the rate of deposition of the surface adsorbed/immobilized species was dependent on the species in solution. In particular, films electrogenerated in the presence of Na+ and K+ had the highest deposition rates. The cyclic voltammetric profiles exhibited dramatic differences depending on the cation present in the electrolyte solution. In addition, we found that all films were electrochemically irreversible in the presence of Li+ and Mg2+ containing electrolyte solutions. Further, and as a proof of concept, we modified high surface area nickel electrodes with HCF in sodium-based electrolytes, finding that these electrodes could operate reversibly at equivalent C-rates as high as 1667C.

中文翻译：

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在镍电极表面电化学生成六氰基铁酸盐和六氰基尿酸盐电活性薄膜：金属离子电池和超级电容器中新型电极材料的一种有前景的合成方法

摘要 普鲁士蓝类似物 (PBA) 最近被研究作为有前途的电池和超级电容器应用的电极材料。虽然大多数探索都集中在 PBA 纳米粒子上，但很少有人关注沉积在金属载体上的 PBA 薄膜。在这项工作中，我们通过循环伏安法检测了镍表面上的六氰基铁酸盐 (HCF) 和六氰基钌酸盐 (HCR) 膜。我们发现沉积的总材料受电解质溶液中存在的金属阳离子的影响，平均而言，表面吸附/固定物质的沉积速率取决于溶液中的物质。特别是，在 Na+ 和 K+ 存在下电生成的薄膜具有最高的沉积速率。根据电解质溶液中存在的阳离子，循环伏安曲线表现出显着差异。此外，我们发现所有薄膜在含有 Li+ 和 Mg2+ 的电解质溶液中都是电化学不可逆的。此外，作为概念证明，我们在钠基电解质中用 HCF 修改了高表面积镍电极，发现这些电极可以在高达 1667C 的等效 C 速率下可逆地运行。