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Graphene‐Wrapped Nanoporous Nickel‐Cobalt Oxide Flakes for Electrochemical Supercapacitors
Author(s) -
Azhar Alowasheeir,
Zakaria Mohamed B.,
Lin Jianjian,
Chikyow Toyohiro,
Martin Darren J.,
Alghamdi Yousef Gamaan,
Alshehri Abdulmohsen Ali,
Bando Yoshio,
Hossain Md. Shahriar A.,
Wu Kevin C.W.,
Kumar Nanjundan Ashok,
Yamauchi Yusuke
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201801174
Subject(s) - graphene , nanoporous , materials science , oxide , supercapacitor , composite number , capacitance , chemical engineering , nickel , cobalt oxide , cobalt , electrochemistry , nanotechnology , composite material , electrode , metallurgy , chemistry , engineering
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 ).