超级电容器
电容
双金属片
复合数
氢氧化物
镍
材料科学
多孔性
纳米复合材料
比表面积
电极
电流密度
金属有机骨架
层状双氢氧化物
纳米技术
化学工程
复合材料
电化学
化学
金属
催化作用
工程类
冶金
吸附
有机化学
物理化学
物理
量子力学
作者
Quanyou Feng,Haibiao Zhang,Zhixiang Guo,Yiren Liu,Naien Shi,Jingrui Zhang,Shasha Wang,Linghai Xie
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2024-07-29
卷期号:7 (15): 6267-6277
标识
DOI:10.1021/acsaem.4c00919
摘要
Metal–organic frameworks (MOFs) are renowned for their high porosity and meticulously structured pores. Nonetheless, intrinsic shortcomings, namely, low electrical conductivity and inadequate stability, impede their broad application as electrode materials. Herein, the bimetallic nickel–cobalt MOF (NiCo-MOF) was prepared using layered double hydroxides (LDH) as precursors by a reverse design strategy, and then the flower-like NiCo-MOF@Ni-LDH was synthesized by hydrothermal recombination of NiCo-MOF with nickel layer double hydroxide (Ni-LDH). The NiCo-MOF@Ni-LDH demonstrates an exceptional specific capacitance of 1880 F g–1 at 1 A g–1, coupled with an outstanding rate performance, maintaining 81.49% of its capacitance at a higher current density of 10 A g–1. The excellent electrochemical characteristics can be ascribed to the unique porous structure, which significantly enhances the specific surface area and augments the availability of active sites, while the presence of open pore channels on the surface facilitates ion diffusion. Moreover, at a power density of 799.9 W kg–1, an asymmetric supercapacitor (ASC) employing a NiCo-MOF@Ni-LDH//activated carbon configuration exhibits a remarkable energy density of 69.9 Wh kg–1, concurrently preserving 75.6% capacity retention following 5000 charging and discharging cycles. These exceptional electrochemical properties highlight the promising potential of the NiCo-MOF@Ni-LDH nanocomposite as an electrode material for supercapacitors.
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