Journal
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Volume 14, Issue 1, Pages 764-776Publisher
ESG
DOI: 10.20964/2019.01.43
Keywords
Supercapacitor; ZIF-8; CoO; NiO; graphitic; Nanocomposite
Categories
Funding
- GUET excellent graduate thesis program [16YJPYSS30]
- NSFC [51861004, 51561006, U1501242]
- GXNSF [2016GXNSFFA380012, AD17195073, 2017GXNSFDA198018]
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Doping porous carbon with transition metal oxides is highly desirable for high performance supercapacitors due to their synergistic effect. Herein, a highly dispersed CoO-NiO nanoparticle doped porous carbon (CoO-NiO@ZIF-C) was prepared by pyrolysis of Ni2+ and Co2+ ions impregnated ZIF-8. The metal nanoparticles catalyze the formation of graphitic carbon, while the N-doped carbon substrate confines the nanoparticles during the process. The resulted nanocomposite demonstrates excellent capacitive performance, which delivered a specific capacitance of 552.3 F g(-1) at current density of 1 A g(-1). Moreover, an asymmetric supercapacitor was successfully assembled using CoO-NiO@ZIF-C as positive electrode and reduced graphene oxide as the negative electrode. The two-electrode cell delivered a maximum energy density of 43.5 Wh kg(-1) at a power density of 1892.1 W kg(-1) with good stability.
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