超级电容器
材料科学
电极
电解质
电化学
镍
氢氧化物
化学工程
静电纺丝
层状双氢氧化物
电容
电流密度
储能
功率密度
纳米技术
化学
复合材料
冶金
物理化学
功率(物理)
物理
量子力学
工程类
聚合物
作者
Hao Jiang,Jinbing Cheng,Junbao He,Chunying Pu,Xiaoyu Huang,Yichong Chen,Xiaoqing Lu,Yang Lu,Deyang Zhang,Zhaorui Wang,Yumin Leng,Paul K. Chu,Yongsong Luo
出处
期刊:ACS omega
[American Chemical Society]
日期:2023-12-11
卷期号:8 (51): 49017-49026
被引量:1
标识
DOI:10.1021/acsomega.3c06674
摘要
Flexible electrodes for energy storage and conversion require a micro-nanomorphology and stable structure. Herein, MXene fibers (MX-CNF) are fabricated by electrospinning, and Co-MOF nanoarrays are prepared on the fibers to form Co-MOF@MX-CNF. Hydrolysis and etching of Co-MOF@MX-CNF in the Ni2+ solution produce cobalt–nickel layered double hydroxide (CoNi-LDH). The CoNi-LDH nanoarrays on the MX-CNF substrate have a large specific surface area and abundant electrochemical active sites, thus ensuring effective exposure of the CoNi-LDH active materials to the electrolyte and efficient pseudocapacitive energy storage and fast reversible redox kinetics for enhanced charging–discharging characteristics. The CoNi-LDH@MX-CNF electrode exhibits a discharge capacity of 996 F g–1 at a current density of 1 A g–1 as well as 78.62% capacitance retention after 3,000 cycles at 10 A g–1. The asymmetric supercapacitor (ASC) comprising the CoNi-LDH@MX-CNF positive electrode and negative activated carbon electrode shows an energy density of 48.4 Wh kg–1 at a power density of 499 W kg–1 and a capacity retention of 78.9% after 3,000 cycles at a current density of 10 A g–1. Density-functional theory calculations reveal the charge density difference and partial density of states of CoNi-LDH@MX-CNF confirming the large potential of the CoNi-LDH@MX-CNF electrode in energy storage applications.
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