Dendritic Ni(Cu)-polypyrrole hybrid films for a pseudo-capacitor.
Dendritic Ni(Cu)-polypyrrole hybrid films for a pseudo-capacitor.
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DOI：
10.1039/c5nr05541e
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发表时间：
2015-11
期刊：
影响因子：
6.7
通讯作者：
Bit Na Choi;Woo Won Chun;Aniu Qian;So Jeong Lee;C. Chung
中科院分区：
文献类型：
--
作者：
Bit Na Choi;Woo Won Chun;Aniu Qian;So Jeong Lee;C. Chung
采用电沉积和电化学去合金化两种简单的方法制备了具有独特形貌的树枝状Ni（Cu）-聚吡咯复合薄膜，并用于赝电容器。通过在高阴极电位下的析氢反应（HER）内的电沉积制备多孔枝晶的三维结构;高表面积结构在电极和电解质之间提供足够的氧化还原反应。研究了活性层厚度对超级电容器性能的影响，在扫描速率为5 mV s（-1）时，厚度为60 μ m的Ni（Cu）PPy复合电极表现出最高的性能，达到659.52 F g（-1）。在较厚的层中，由于电解质中离子的扩散限制，比电容变得较小。由于导电聚吡咯在树枝状纳米多孔Ni（Cu）层基体中的添加以及复合材料的协同效应，多孔树枝状Ni（Cu）电极上的聚吡咯杂化提供了上级比电容和优异的循环稳定性。
Dendritic Ni(Cu)-polypyrrole hybrid films are fabricated for a pseudo-capacitor in a unique morphology using two simple methods: electro-deposition and electrochemical de-alloying. Three-dimensional structures of porous dendrites are prepared by electro-deposition within the hydrogen evolution reaction (HER) at a high cathodic potential; the high-surface-area structure provides sufficient redox reactions between the electrodes and the electrolyte. The dependence of the active-layer thickness on the super-capacitor performance is also investigated, and the 60 μm-thick Ni(Cu)PPy hybrid electrode presents the highest performance of 659.52 F g(-1) at the scan rate of 5 mV s(-1). In the thicker layers, the specific capacitance became smaller due to the diffusion limitation of the ions in an electrolyte. The polypyrrole-hybridization on the porous dendritic Ni(Cu) electrode provides superior specific capacitance and excellent cycling stability due to the improvement in electric conductivity by the addition of conducting polypyrrole in the matrices of the dendritic nano-porous Ni(Cu) layer and the synergistic effect of composite materials.