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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)538-547
Journal / PublicationElectrochimica Acta
Volume283
Online published30 Jun 2018
Publication statusPublished - 1 Sep 2018

Abstract

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 F g−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.

Research Area(s)

  • Core-shell structure, Energy storage, Hybrid device, Ordered macro-porous electrode plate, Supercapacitors