Nickel hexacyanoferrate flower-like nanosheets coated three dimensional porous nickel films as binder-free electrodes for neutral electrolyte supercapacitors
Nickel hexacyanoferrate flower-like nanosheets coated three dimensional porous nickel films as binder-free electrodes for neutral electrolyte supercapacitors
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DOI：
10.1016/j.electacta.2015.03.089
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发表时间：
2015-06
影响因子：
6.6
通讯作者：
Hong-Ying Jiang;Yitao Xu;Tao Wang;Pengli Zhu;Shuhui Yu;Yan Yu;Xianzhu Fu;R. Sun;C. Wong
中科院分区：
文献类型：
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作者：
Hong-Ying Jiang;Yitao Xu;Tao Wang;Pengli Zhu;Shuhui Yu;Yan Yu;Xianzhu Fu;R. Sun;C. Wong
采用氢气泡模板电沉积和电化学聚合相结合的方法，成功制备了花状六氰合铁酸镍（NiHCF）纳米片包覆三维多级多孔镍复合薄膜。该新型三维多孔NiHCF/Ni复合薄膜在KNO 3中性电解液中作为无粘结剂的超级电容器集成电极表现出优异的电化学性能。在KNO 3中性电解液中，三维多孔NiHCF/Ni膜电极的比电容是光滑Ni膜电极的10倍左右。3D多孔NiHCF/Ni膜电极还显示出约18，000次充电-放电循环的良好长期稳定性。电化学性能的改善可能归因于大的比表面积，高导电通路和快速的离子扩散，直接生长在三维分级多孔互连导电支架集流体上的花状NiHCF纳米片。
Nickel hexacyanoferrate (NiHCF) flower-like nanosheets coated three dimensional (3D) hierarchical porous Ni composite films are successfully prepared by the combination of hydrogen-bubble template electro-deposition and electrochemical polymerization methods. The novel 3D porous NiHCF/Ni composite films demonstrate excellent electrochemical performance as binder-free integrated electrodes for supercapacitors in KNO3neutral electrolyte. Comparing to the NiHCF coated on smooth Ni film, the 3D hierarchical porous NiHCF/Ni film electrodes exhibit about 10 times larger specific capacitance in KNO3neutral electrolyte. The 3D porous NiHCF/Ni film electrodes also illustrate good long-term stability for about 18,000 charge-discharge cycles. The improvement of electrochemical performance might be ascribed to the large specific area, highly conductive pathway and fast ion diffusion for the flower-like NiHCF nanosheets directly growth on the 3D hierarchical porous interconnected conductive scaffold current collectors.