Core-shell CoMoO4@Ni(OH)(2) on ordered macro-porous electrode plate for high-performance supercapacitor

Multidimensional CoMoO4@Ni(OH)(2) nanocomposite materials are fabricated on the nickel modified surface and channels of an ordered macro-porous electrode plate (OMEP) by a multistep high temperature hydrothermal method as the supercapacitor electrode in a high power density energy storage device. The effects, morphology, capacitive properties, and formation mechanism of the CoMoO4@Ni(OH)(2) composite materials are systematically investigated. Compared to nanostructured nickel grown on the OMEP or CoMoO4@Ni(OH)(2) on nickel plate with the same area, the CoMoO4@Ni(OH)(2)/OMEP shows enhanced electrochemical energy storage properties such as high energy capacitance of 8.55 F cm(-2) (1812.42 Fg(-1)) at 2 mA cm(-2) and good cycling stability of 87.42% capacity retention after 5000 cycles. An asymmetrical supercapacitor (ASC) device is assembled with a polyethylene (PE) membrane, CoMoO4@Ni(OH)(2)/OMEP, and active carbon covered nickel foam. The ASC with the CoMoO4@Ni(OH)(2)/OMEP has an energy density of 9.66 Wh Kg(-1) even at a power density of 3000 W Kg(-1) as well as stable power characteristics with 86.5% retention after 10,000 cycles at a current of 0.06 A. The device produces large instantaneous power after charging at 2.8 V for 10 s one ASC can power a 5 mm red LED with high efficiency. (C) 2018 Elsevier Ltd. All rights reserved.