假电容器
双金属
化学
X射线光电子能谱
电化学
价(化学)
纳米技术
超级电容器
热液循环
化学工程
电极
材料科学
有机化学
物理化学
工程类
作者
Hai-Meng Ma,Jiaojiao Yi,Shuang Li,Chong Jiang,Junhua Wei,Ya‐Pan Wu,Jun Zhao,Dongsheng Li
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2019-07-25
卷期号:58 (15): 9543-9547
被引量:50
标识
DOI:10.1021/acs.inorgchem.9b00937
摘要
Exploring high-performance metal–organic frameworks (MOFs) for pseudocapacitors is quite meaningful for energy storage. Herein a bimetal NiCo-MOF with ultrathin thickness was prepared via a simple hydrothermal method, which shows excellent electrochemical performance with specific capacitances of 1945.83 and 1700.40 F/g at current densities of 0.5 and 1 A/g, respectively, while maintaining good stability. X-ray photoelectron spectroscopy and X-ray absorption near-edge spectroscopy spectra unravel that the strong coupling between Ni and Co species enhances the valence state of Ni2+ in the ultrathin nanosheets, which facilitates the charge transfer during the electrochemical reaction and results in greatly improved pseudocapacitive reactivity. This work provides guidance on the promising prospect of MOF materials for pseudocapacitor applications.
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