One-pot Hydrothermal Synthesis of Novel NiCoO2/Reduced Graphene Oxide Composites for Supercapacitors

doi:10.1007/s40242-017-7026-9

Abstract

Abstract:

Novel NiCoO₂/rGO composites with a structure of NiCoO₂ nanoparticles anchored on layers of reduced graphene oxide(rGO) were synthesized via a simple one-pot hydrothermal method and were used as faradaic electrodes for supercapacitors. The microstructures of NiCoO₂/rGO composites were characterized by means of field emission scanning electron microscopy(FESEM), transmission electron microscopy(TEM), X-ray diffraction(XRD) and thermogravimetric analysis(TGA). When acting as faradaic electrodes for supercapacitors, NiCoO₂/rGO composites exhibited a specific capacity of 288 C/g at the current density of 2 A/g and maintained 139.98 C/g at 20 A/g. High capacity retention ratios up to 88% could be achieved after 1000 cycles at a current density of 2 A/g. The outstanding cycling stability was primarily attributed to the combination of mixed transition metal oxides and rGO, which not only maintains a high electrical conductivity for the overall electrode but also prevents the aggregation and volume expansion of electrochemical materials during the cycling processes.

Key words: NiCoO₂, rGO, Composite, Faradaic electrode, Supercapacitor

WANG Hongzhi, SHI Xin, SHI Yulei, ZHANG Weiguo, YAO Suwei. One-pot Hydrothermal Synthesis of Novel NiCoO₂/Reduced Graphene Oxide Composites for Supercapacitors[J]. Chemical Research in Chinese Universities, 2017, 33(4): 638-642.

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One-pot Hydrothermal Synthesis of Novel NiCoO₂/Reduced Graphene Oxide Composites for Supercapacitors

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