超级电容器
电极
电容
碳纤维
电解质
假电容
无机化学
比表面积
硫黄
氮气
循环伏安法
作者
Rabia Ahmad,Naseem Iqbal,Mutawara Mahmood Baig,Tayyaba Noor,Ghulam Ali,Iftikhar Hussain Gul
标识
DOI:10.1016/j.electacta.2020.137147
摘要
Abstract Herein we report the synthesis of nitrogen-doped carbon nanotubes (NC) based sulfide (S) and nickel hydroxide (NH) supported on nickel foam as a novel electrode material for the supercapacitors (abbreviated as Co/NC/S@NH). A class of zeolitic imidazolate frameworks, ZIF-67 (Co), is initially grown to synthesize nanotubes directly on the nickel foam (NF). The anion exchange reactions are performed for the growth of sulfide and nickel hydroxide on ZIF-67 (Co) derived carbon nanotubes. In the structural analysis, X-ray diffraction confirmed the successful in-situ growth of carbon nanotubes. Transmission electron microscopy was employed to confirm the formation of NC-based sulfide and nickel hydroxide. The Co/NC/S@NH, hierarchical hybrid electrode, exhibited improved capacitance of 1636 F/g at 1 A/g (982 C/g or 273 mA/h) with exceptional cyclic stability. The Co/NC/S@NH showed capacity retention of 94% over 5,000 cycles. The enhanced electrochemical performance of the synthesized electrode is due to the improved redox reactions and direct growth of nitrogen-doped carbon nanotubes on 3D nickel foam which act as superhighways for electron transportation. Moreover, the sulfur ions could hinder the collapse of a structure by the intercalation among layers, whereas the extremely hydroxylated surface of Ni(OH)2 nanosheets could promote accessibility of ions to the electrolyte which decreases the resistance of electrodes which agreed with the finding from electrochemical impedance spectroscopy.
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