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Liquid-Crystal-Mediated 3D Macrostructured Composite of Co/Co3O4 Embedded in Graphene: Free-Standing Electrode for Efficient Water Splitting

Journal Article


Abstract


  • A free-standing, 3D, macro/microstructured atomic-cobalt/cobalt-oxide–reduced-graphene-oxide (Co/Co3O4-Gr) composite has been developed for complete water splitting. The self-assembled porous morphology associated with the metal/metal oxide active sites makes the whole surface of the electrode conducive toward catalyzing hydrogen and oxygen evolution in alkaline media at a low onset potential. The liquid-crystal-mediated free-standing electrocatalyst shows oxygen evolution at the onset potential of 1.38 V and at the potential of 1.66 V for a current density of 10 mA cm−2. These potentials are comparable to the corresponding values for Ru/C (1.46 and 1.62 V, respectively). In addition, the promising hydrogen evolution performance of our composite compared to Pt/C in alkaline media makes it an efficient bifunctional electrocatalyst for comprehensive water splitting, as well as provides guidance for future electrochemical energy material technologies.

Authors


  •   Islam, Md. Monirul (external author)
  •   Faisal, Shaikh Nayeem (external author)
  •   Akhter, Taslima (external author)
  •   Roy, Anup Kumar (external author)
  •   Minett, Andrew I. (external author)
  •   Konstantinov, Konstantin K.
  •   Dou, Shi Xue

Publication Date


  • 2017

Citation


  • Islam, M., Faisal, S., Akhter, T., Roy, A., Minett, A. I., Konstantinov, K. & Dou, S. Xue. (2017). Liquid-Crystal-Mediated 3D Macrostructured Composite of Co/Co3O4 Embedded in Graphene: Free-Standing Electrode for Efficient Water Splitting. Particle and Particle Systems Characterization, Online First 1600386-1-1600386-6.

Scopus Eid


  • 2-s2.0-85014238692

Start Page


  • 1600386-1

End Page


  • 1600386-6

Volume


  • Online First

Abstract


  • A free-standing, 3D, macro/microstructured atomic-cobalt/cobalt-oxide–reduced-graphene-oxide (Co/Co3O4-Gr) composite has been developed for complete water splitting. The self-assembled porous morphology associated with the metal/metal oxide active sites makes the whole surface of the electrode conducive toward catalyzing hydrogen and oxygen evolution in alkaline media at a low onset potential. The liquid-crystal-mediated free-standing electrocatalyst shows oxygen evolution at the onset potential of 1.38 V and at the potential of 1.66 V for a current density of 10 mA cm−2. These potentials are comparable to the corresponding values for Ru/C (1.46 and 1.62 V, respectively). In addition, the promising hydrogen evolution performance of our composite compared to Pt/C in alkaline media makes it an efficient bifunctional electrocatalyst for comprehensive water splitting, as well as provides guidance for future electrochemical energy material technologies.

Authors


  •   Islam, Md. Monirul (external author)
  •   Faisal, Shaikh Nayeem (external author)
  •   Akhter, Taslima (external author)
  •   Roy, Anup Kumar (external author)
  •   Minett, Andrew I. (external author)
  •   Konstantinov, Konstantin K.
  •   Dou, Shi Xue

Publication Date


  • 2017

Citation


  • Islam, M., Faisal, S., Akhter, T., Roy, A., Minett, A. I., Konstantinov, K. & Dou, S. Xue. (2017). Liquid-Crystal-Mediated 3D Macrostructured Composite of Co/Co3O4 Embedded in Graphene: Free-Standing Electrode for Efficient Water Splitting. Particle and Particle Systems Characterization, Online First 1600386-1-1600386-6.

Scopus Eid


  • 2-s2.0-85014238692

Start Page


  • 1600386-1

End Page


  • 1600386-6

Volume


  • Online First