材料科学
超级电容器
镍
基质(水族馆)
异质结
电容
电极
化学浴沉积
氢氧化钴
钴
纳米技术
电流密度
电导率
氢氧化物
化学工程
光电子学
电解质
电化学
薄膜
化学
冶金
物理化学
量子力学
工程类
地质学
物理
海洋学
作者
Zuxue Bai,Deyang Zhang,Ying Guo,Ya Yang,Hailong Yan,Yangbo Wang,Jinbing Cheng,Paul K. Chu,Huan Pang,Yongsong Luo
标识
DOI:10.1002/adsu.202100371
摘要
Abstract Flexible electrodes with excellent energy storage and conversion properties that can be produced by a simple process are highly desirable for supercapacitors. Herein, Cobalt‐Nickel double hydroxide (CoNi‐DH) micro‐nanosheet arrays are prepared uniformly on naturally sedimented Ti 3 C 2 T x films by an etching‐deposition‐growth process to form a CoNi‐DH@Ti 3 C 2 T x heterostructure. The naturally sedimented Ti 3 C 2 T x film serves as the substrate to minimize aggregation of the CoNi‐DH nanoarrays to enhance the electrical conductivity. Furthermore, the hierarchical structure comprised of the CoNi‐DH interconnected nanoarrays promotes electrolyte access. By taking advantage of the excellent electrical conduction and high theoretical specific capacitance, the flexible CoNi‐DH@Ti 3 C 2 T x electrode in the supercapacitor delivers a superior specific capacitance of 919.5 F g −1 at 1 A g −1 , and remarkable capacitance retention of 89.6% after 5000 cycles at 20 A g −1 . Density‐functional theory calculations are performed to investigate the charge density difference and partial density of states of CoNi‐DH@Ti 3 C 2 T x and the theoretical assessment suggests that the chemical bonds between Ti 3 C 2 T x and CoNi‐DH are critical to the charge transport, electrical conductivity, and structural stability.
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