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Oxygen plasma functionalization of hexacyanocobaltates for high-capacity supercapacitor electrodes
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jelechem.2020.114382
Hui Ju , Xu Dong Liu , Chao You Tao , Fan Yang , Yan Wang , Xuan Luo , Lin Zhang

Abstract Supercapacitors have attracted much attention because of their unique advantages. Electrode materials, as one of the most important parts, have already been the focus of research. A great effort has been made to address the drawback of low capacity, for example, annealing, forming compound and doping. However, these methods have not brought significant improvement of capacity. Here, we develop a facile method for enhancing the specific capacity of cobalt hexacyanocobalte using oxygen plasma etching. The specific capacity of the engraved sample increased by 62.15% (from 214.0C g−1 to 347.0C g−1 at a current density of 1 A g−1). The excellent capacitive performance is attributed to the synergistic effect of increasing K+ diffusion velocity, exposing more active sites and promoting hydrophilicity. This method may be extended to dramatically improve the specific capacity of Prussian blue, its analogs and even other metal-organic frameworks materials.

中文翻译:

用于高容量超级电容器电极的六氰基钴酸盐的氧等离子体功能化

摘要 超级电容器因其独特的优势而备受关注。电极材料作为最重要的部件之一,已经成为研究的重点。为了解决低容量的缺点,已经做出了很大的努力,例如退火、形成化合物和掺杂。但是,这些方法并没有带来容量的显着提高。在这里,我们开发了一种使用氧等离子体蚀刻提高六氰钴钴比容量的简便方法。雕刻样品的比容量增加了 62.15%(在 1 A g-1 的电流密度下从 214.0C g-1 增加到 347.0C g-1)。优异的电容性能归因于增加 K+ 扩散速度、暴露更多活性位点和促进亲水性的协同效应。
更新日期:2020-09-01
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