期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 11, 页码 8246-8256出版社
AMER CHEMICAL SOC
DOI: 10.1021/am500700x
关键词
nickel oxide; graphene; nanowire; synergistic effect; supercapacitor; sol-gel
资金
- Ministry of Education in Singapore [RGT27/13]
In this study, we report a facile and simple approach to synthesize a composite of mesoporous NiO nanowires and graphene nanosheets for supercapacitor applications. A Ni precursor was prepared by a one-pot sol gel method in a water/ethylene glycol mixture containing a graphene oxide. Heat treatment in air was carried out to thermally reduce the graphene oxide to graphene and to convert the Ni precursor to NiO. NiO nanowires possess a rough surface, have a diameter of around 60 nm and are homogeneously deposited on the graphene sheets. The NiO/graphene nanocomposite demonstrates superior pseudocapacitive properties (high specific capacitance, good cyclic performance, and excellent discharge rate capability) as compared to its counterparts. We postulated that this phenomenon arose from the synergistic effect of the addition of graphene as elastic conductive channels, which resulted in better charge transport and more favorable ionic diffusion.
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