Journal
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Volume 15, Issue 10, Pages 10276-10288Publisher
ESG
DOI: 10.20964/2020.10.34
Keywords
Asymmetric supercapacitor; CoMoO4@NC; Composite; High-performance
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Funding
- Research Team of Anhui Provincial Education Department [2016SCXPTTD]
- Key Projects of Natural Science Research of Anhui Provincial Department of Education [KJ2019A0674]
- Natural Science Foundation of Anhui Province [2008085ME150]
- Key Discipline of Material Science and Engineering of Suzhou University [2017XJZDXK3]
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ZIF-67 derivatives show promising applications in energy storage owing to their high surface area and excellent electrochemical performance. In this work, an N-doped carbon-coated CoMoO4 nanoparticle (CMO@NC) polyhedron was prepared by hydrothermal treatment and calcination. The structural and morphological properties of the obtained samples were measured by X-ray diffraction (XRD), scanning electron microscopy (SEM) and N-2 adsorption/desorption isotherms. In terms of electrochemical performance, CMO@NC exhibits a remarkable specific capacitance of 267.3 F g(-1) at 0.5 A g(-1). Moreover, a hybrid supercapacitor device with CMO@NC as the positive electrode material and active carbon (AC) as the negative electrode material was observed to achieve a specific capacitance of 114 F g(-1) at 0.5 A g(-1), with a stable operational voltage of 1.5 V and a maximum energy density of 35.4 Wh kg(-1) at a power density of 1041 W kg(-1). The specific capacitance retention can reach up to 82.4 % after 5000 cycles, as determined by GCD measurements, indicating outstanding cycling stability and potential application prospects in supercapacitors.
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