NiO mesoporous nanowalls grown on RGO coated nickel foam as high performance electrodes for supercapacitors and biosensors

• DOI: 10.1016/j.electacta.2016.01.211
• Publication Date: 2016-02-01T04:02:17Z
• Authors: Bo Zhao; Tao Wang; Li Jiang; Kai Zhang; Matthew M.F. Yuen; Jian-Bin Xu; Xian-Zhu Fu; Rong Sun; Ching-Ping Wong
• Keywords: RGO coated nickel foam; Nickel oxide mesoporous nanowalls; Glucose sensor; Three dimensional; Supercapacitors; 02 engineering and technology; 0210 nano-technology

Abstract Uniform NiO mesoporous nanowalls are easily fabricated on reduced graphene oxide (RGO) nanosheets coated three dimensional nickel foams (3D NF-G) through a simple aqueous deposition with successive annealing. The structure and morphology of the resulting NiO nanowalls supported on 3D NF-G composites (3D NF-G-NiO) are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX). The 3D NF-G-NiO composites are directly used as binder-free electrodes for supercapacitors and biosensors. For supercapacitor, the electrode delivers high specific capacitance of about 950 F g−1 at a current density of 5 A g−1 with excellent cycling stability. As glucose sensor, the 3D NF-G-NiO electrode can detect glucose with an ultrahigh sensitivity of 3.23 mAmM−1 cm−2 and a superior selectivity with a remarkable lower detection limit towards 10 μM.