Graphene-Wrapped Nanoporous Nickel-Cobalt Oxide Flakes for Electrochemical Supercapacitors
Journal
ChemistrySelect
Journal Volume
3
Journal Issue
29
Pages
8505-8510
Date Issued
2018
Author(s)
Azhar A.
Zakaria M.B.
Lin J.
Chikyow T.
Martin D.J.
Alghamdi Y.G.
Alshehri A.A.
Bando Y.
Hossain M.S.A.
Kumar N.A.
Yamauchi Y.
Abstract
A novel approach for hybridizing nanoporous NiCo oxide flakes with graphene sheets is reported. Positively charged cyano-bridged CoNi coordination polymer flakes (CoNi-CP) are mixed with graphene (G) suspension with negatively charged surface. Due to effective electrostatic interaction, both the materials are hybridized to form CoNi-CP/G composite. The as-prepared CoNi-CP/G composite is thermally treated in air, to remove the organic components without affecting the integrity of the parent G sheets. Through the thermal treatment, the CoNi-CP flakes wrapped into G sheets are converted to NiCo oxide, resulting in a new composite consisting of NiCo oxide flakes and G sheets. The NiCo-oxide/G composite shows the high specific capacitance (? 199 F g-1) at 5 mV/s, and features the good capacitance retention of ?68% at 100 mV(? 135 F g ?1 ). ? 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Subjects
graphene
hybridization
mixed metal oxides
nanoporous materials
supercapacitors
Type
journal article