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

Journal Article


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).

Publication Date


  • 2018

Citation


  • Azhar, A., Zakaria, M. B., Lin, J., Chikyow, T., Martin, D. J., Alghamdi, Y. G., . . . Yamauchi, Y. (2018). Graphene-Wrapped Nanoporous Nickel-Cobalt Oxide Flakes for Electrochemical Supercapacitors. ChemistrySelect, 3(29), 8505-8510. doi:10.1002/slct.201801174

Scopus Eid


  • 2-s2.0-85051176915

Start Page


  • 8505

End Page


  • 8510

Volume


  • 3

Issue


  • 29

Place Of Publication


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).

Publication Date


  • 2018

Citation


  • Azhar, A., Zakaria, M. B., Lin, J., Chikyow, T., Martin, D. J., Alghamdi, Y. G., . . . Yamauchi, Y. (2018). Graphene-Wrapped Nanoporous Nickel-Cobalt Oxide Flakes for Electrochemical Supercapacitors. ChemistrySelect, 3(29), 8505-8510. doi:10.1002/slct.201801174

Scopus Eid


  • 2-s2.0-85051176915

Start Page


  • 8505

End Page


  • 8510

Volume


  • 3

Issue


  • 29

Place Of Publication