One-pot in-situ synthesis of Ni(OH)_2-NiFe_2O_4 nanosheet arrays on nickel foam as binder-free electrodes for supercapacitors

摘要

We present a facile and low-cost in-situ growth of Ni(OH)(2)-NiFe2O4 nanosheet arrays on nickel foams via one-pot hydrothermal process. Different amounts of Fe(NO3)(3) solutions as the oxidant have been used to optimize morphology of the nanosheet arrays on nickel foams without any templates and nickel salts. The nanosheet arrays show excellent electrochemical stability as well as good electroconductivity. As an electrochemical electrode, it presents an optimized areal capacitance (1.434F cm(-2) at the current density of 1.0mA cm(-2)) and excellent cycling stability (retaining 75.9% after 5000 cycles at 3.0mA cm(-2)). This strategy holds great potential for low-cost and readily scalable production of high performance electrode materials for supercapacitors.