Morphology controllable NiCo2O4 nanostructure for excellent energy storage device and overall water splitting

NiCo2O4 nanosheets for hybrid supercapadtors with long cycle stability are successfully fabricated by a one-step hydrothermal method. The battery type electrode material shows capacitances of 571.3 mAh g(-1) at 1 A g(-1) and excellent cycling stability. The specific capacitance retention can still retain 100% at 5 A g(-1), after 10,000 cycles. In addition. When acts as electrocatalyst, the as-prepared samples present a low overpotential of OER (290 mV) and HER (165 mV) at 10 mA cm(-2), and a low cell voltage of 1.72 V at 10 mA cm(-2) and long-term durability for 14 h, indicating that NiCo2O4 structure can effectively improve electrochemical performance, which provides a broad possibility for the further development of cheap electrode materials for overall splitting. (C) 2020 Elsevier B.V. All rights reserved.