One-step synthesis of free-standing α -Ni(OH) 2 nanosheets on reduced graphene oxide for high-performance supercapacitors

In this work, a hierarchical hybrid structure of reduced graphene oxide (rGO) supported ultrathin α -Ni(OH) 2 nanosheets (denoted as α -Ni(OH) 2 @rGO NSs) has been developed successfully via an environmentally friendly one-step solution method. The resulting product of α -Ni(OH) 2 @rGO NSs was further characterized by scanning electron microscope, transmission electron microscope, x-ray diffraction, Raman spectroscopy, x-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller. The ultrathin α -Ni(OH) 2 nanosheets of around 6 nm in thickness are uprightly coated on the double sides of rGO substrate. When evaluated as electrodes for supercapacitors, the hybrid α -Ni(OH) 2 @rGO NSs demonstrate excellent supercapacitor performance and cycling stability, compared with the self-aggregated α -Ni(OH) 2 powder. Even after 2000 cycles, the hybrid electrodes still can deliver a specific capacitan...

Bitao Dong, Han Zhou, Jin Liang, Lusi Zhang, Guoxin Gao and Shujiang Ding

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