Synthesis of Co(OH)2/Ni(OH)2 nanomaterials with excellent pseudocapacitive behavior and high cycling stability for supercapacitors

Sheet-like Co(OH)(2) or Co(OH)(2)/Ni(OH)(2) nanomaterials has been synthesized on conducting carbon fiber paper (CFP) via a simple electrochemical deposition. The microstructural, chemical bonding and surface morphology of the nanomaterials were investigated by X-ray diffraction (XRD), X-ray photoelectron specttoscopy (XPS) and scanning electron microscopy (SEM). And the electrochemical properties of nanomaterials were investigated by cyclic voltammetry and galvanostatic charge-discharge. Compared to Co(OH)(2), Co(OH)(2)/Ni(OH)2 nanomaterials exhibits not only a higher specific capacitance (1498 Fg(-1) than Co(OH)(2) (709 Fg(-1)) at a current density 2 Ag-1) but also a higher cycling stability (92.4% specific capacitance remain over 20,000 charge discharge cycles than Co(OH)(2) (723% remains) at a high current density of 32 Ag-1). The introduction of Ni(OH)(2) brings a synergistic effect for the whole material. (C) 2016 Elsevier B.V. All rights reserved.