期刊
INORGANIC CHEMISTRY FRONTIERS
卷 7, 期 19, 页码 3646-3656出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0qi00730g
关键词
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资金
- National Natural Science Foundation of China [51572157, 51702188, 21902085]
- Fundamental Research Funds of Shandong University [2015JC016, 2015JC036, 2017TB0024, 2018JC046]
- Natural Science Foundation of Shandong Province [ZR2016BM16, ZR2019QF012]
- Qilu Young Scholar Scheme of Shandong University [31370088963043]
- Natural Science and Development Foundation of Shenzhen [JCYJ20190807093205660]
- Young Scholars Program of Shandong University [2018WLJH25]
In this work, well-designed Co2V2O7/graphene composites with hollow Co(2)V(2)O(7)nanocages uniformly distributed on the graphene sheets were synthesized through a combined approach of a precipitation reaction to assemble zeolitic imidazolate frameworks-67 (ZIF-67) on graphene and a subsequentin situion exchange reaction to transform ZIF-67 into hollow Co(2)V(2)O(7)nanocages. Morphological and compositional characterization confirmed that ZIF-67 had been successfully transformed into the nanoparticle-assembled hollow Co(2)V(2)O(7)nanocages, which are densely distributed on graphene. Benefiting from the well-designed structure and compositions, the electrochemical tests indicate that the as-prepared Co2V2O7/graphene electrode exhibits a high specific capacity of 276.5 C g(-1)at 1 A g(-1), good rate capability, and remarkable long cycling stability (93% capacity retention after 10 000 cycles). The asymmetric supercapacitor devices assembled with Co2V2O7/graphene and reduced graphene oxides deliver a high energy density of 25.7 W h kg(-1)at a power density of 663.5 W kg(-1)and excellent long cycling stability. The excellent electrochemical performance and the facile synthetic process make Co2V2O7/graphene a promising cathode material for supercapacitors.
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