期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 612, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.125902
关键词
Mixed metal oxide; Hollow spheres; RGO; Lamellar films; Supercapacitors
资金
- Innovation Entrepreneurship Program of Jiangsu Province [Su rencaiban [2016] 32]
- National Natural Science Foundation of China [21878129]
- Industry Prospect and Key Core Technology (Competition Project) of Jiangsu Province [BE2019093]
- Natural Science Foundation of Jiangsu Province [BK20190849]
- Natural Science Foundation of the Higher Education Institutions of Jiangsu Province [19KJB150024]
The mixed metal oxide hollow spheres/RGO hybrid lamellar films exhibit superior electrochemical performances and remarkable cycling retention, enabling their use in asymmetric supercapacitors and powering a white LED in an experiment.
Mixed metal oxide hollow spheres (NiCo2O4, ZnCo2O4 and CoMn2O4)/RGO hybrid lamellar films are constructed by the method of vacuum filtration. After a simple assembling process, the mixed metal oxides are interspersed between the RGO nanosheets, which can effectively increase interlayer spacing, improve electrolyte ions penetration and fast electron diffusion. The NiCo2O4/2RGO, ZnCo2O4/2RGO and CoMn2O4/4RGO hybrid lamellar films exhibit superior electrochemical performances (1414.7 F g(-1), 1075.4 F g(-1) and 992.9 F g(-1) at 1 A g(-1)) and remarkable cycling retention (90.2 %, 89.3 % and 91.2 %). Meanwhile, the asymmetric supercapacitor (ASCs) was assembled with active carbon and NiCo2O4/2RGO, which deliver maximal specific capacitance of 97.4 F g(-1) (1 A g(-1)) and a high energy density of 34.6 Wh k g(-1) at a power density of 799.0 W kg(-1). Moreover, a white LED can be lit by two ASCs in series.
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