Graphene-Wrapped Nanoporous Nickel-Cobalt Oxide Flakes for Electrochemical Supercapacitors

Alowasheeir Azhar, Mohamed B. Zakaria, Jianjian Lin, Toyohiro Chikyow, Darren J. Martin, Yousef Gamaan Alghamdi, Abdulmohsen Ali Alshehri, Yoshio Bando, Md Shahriar A. Hossain, Kevin C.W. Wu, Nanjundan Ashok Kumar, Yusuke Yamauchi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


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).

Original languageEnglish
Pages (from-to)8505-8510
Number of pages6
Issue number29
Publication statusPublished - 2018 Aug 7


  • graphene
  • hybridization
  • mixed metal oxides
  • nanoporous materials
  • supercapacitors

ASJC Scopus subject areas

  • Chemistry(all)


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