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Freestanding NiFe Oxyfluoride Holey Film with Ultrahigh Volumetric Capacitance for Flexible Asymmetric Supercapacitors
Small ( IF 13.0 ) Pub Date : 2017-11-14 , DOI: 10.1002/smll.201702295
Kun Liang 1 , Kyle Marcus 1 , Zhenzhong Yang 2 , Le Zhou 3 , Hao Pan 4 , Yuanli Bai 4 , Yingge Du 2 , Mark H. Engelhard 5 , Yang Yang 1, 3
Affiliation  

In this work, a freestanding NiFe oxyfluoride (NiFeOF) holey film is prepared by electrochemical deposition and anodic treatments. With the combination of good electrical conductivity and holey structure, the NiFeOF holey film offers superior electrochemical performance with maximum specific capacitance of 670 F cm−3 (134 mF cm−2), due to the following reasons: (i) The residual metal alloy framework can be used as the current collector to improve electrode conductivity. Moreover, the as‐prepared freestanding NiFeOF holey film can be used as a supercapacitor electrode without reliance on binders and other additives. The residual metal alloy framework and binder‐free electrode effectively reduce electrode resistance, thus improving electron transport. (ii) The highly interconnected holey structure and hierarchical pore distribution provide a high specific surface area to improve electron transport, enhancing rapid ion transport, and mitigating diffusion limitations throughout the holey film. (iii) The excellent mechanical characteristics facilitate flexibility and cyclability related performance. Additionally, the NiFeOF holey film presents exceptional electrochemical performance, showing that it is a promising alternative for small/microsize electronic devices.

中文翻译:

具有超高容量电容的独立式NiFe氟氧化物多孔膜,用于柔性不对称超级电容器

在这项工作中,通过电化学沉积和阳极处理制备了独立的氟氧化镍铁(NiFeOF)多孔膜。NiFeOF多孔膜具有良好的导电性和多孔结构,可提供出色的电化学性能,最大比电容为670 F cm -3(134 mF cm -2),原因如下:(i)残留的金属合金骨架可用作集电器,以提高电极的导电性。此外,所制备的独立式NiFeOF多孔膜可以用作超级电容器电极,而无需依赖粘合剂和其他添加剂。残留的金属合金骨架和无粘结剂电极可有效降低电极电阻,从而改善电子传输。(ii)高度互连的孔结构和分层的孔分布提供了高的比表面积,以改善电子传输,增强离子的快速传输并减轻整个孔膜中的扩散限制。(iii)优异的机械特性有助于提高与柔韧性和可循环性相关的性能。此外,
更新日期:2017-11-14
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