title: Graphene-Co₃O₄ nanocomposite as electrocatalyst with high performance for oxygen evolution reaction.
abstract: Graphene-Co₃O₄ composite with a unique sandwich-architecture was successfully synthesized and applied as an efficient electrocatalyst for oxygen evolution reaction. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analyses confirmed that Co₃O₄ nanocrystals were homogeneously distributed on both sides of graphene nanosheets. The obtained composite shows enhanced catalytic activities in both alkaline and neutral electrolytes. The onset potential towards the oxygen evolution reaction is 0.406 V (vs. Ag/AgCl) in 1 M KOH solution, and 0.858 V (vs. Ag/AgCl) in neutral phosphate buffer solution (PBS), respectively. The current density of 10 mA/cm(2) has been achieved at the overpotential of 313 mV in 1 M KOH and 498 mV in PBS. The graphene-Co₃O₄ composite also exhibited an excellent stability in both alkaline and neutral electrolytes. In particular, no obvious current density decay was observed after 10 hours testing in alkaline solution and the morphology of the material was well maintained, which could be ascribed to the synergistic effect of combining Co₃O₄ and graphene.
authors.affiliation: 1] Center for Clean Energy Technology, School of Chemistry and Forensic Science, Faculty of Science, University of Technology, Sydney, Sydney, NSW 2007, Australia [2] Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing, 100081, China.
authors.forename: Yufei
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Center for Clean Energy Technology, School of Chemistry and Forensic Science, Faculty of Science, University of Technology, Sydney, Sydney, NSW 2007, Australia.
authors.forename: Shuangqiang
authors.initials: S
authors.lastname: Chen
authors.affiliation: Center for Clean Energy Technology, School of Chemistry and Forensic Science, Faculty of Science, University of Technology, Sydney, Sydney, NSW 2007, Australia.
authors.forename: Bing
authors.initials: B
authors.lastname: Sun
authors.affiliation: Center for Clean Energy Technology, School of Chemistry and Forensic Science, Faculty of Science, University of Technology, Sydney, Sydney, NSW 2007, Australia.
authors.forename: Dawei
authors.initials: D
authors.lastname: Su
authors.affiliation: Center for Clean Energy Technology, School of Chemistry and Forensic Science, Faculty of Science, University of Technology, Sydney, Sydney, NSW 2007, Australia.
authors.forename: Xiaodan
authors.initials: X
authors.lastname: Huang
authors.affiliation: Center for Clean Energy Technology, School of Chemistry and Forensic Science, Faculty of Science, University of Technology, Sydney, Sydney, NSW 2007, Australia.
authors.forename: Hao
authors.initials: H
authors.lastname: Liu
authors.affiliation: Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing, 100081, China.
authors.forename: Yiming
authors.initials: Y
authors.lastname: Yan
authors.affiliation: Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing, 100081, China.
authors.forename: Kening
authors.initials: K
authors.lastname: Sun
authors.affiliation: Center for Clean Energy Technology, School of Chemistry and Forensic Science, Faculty of Science, University of Technology, Sydney, Sydney, NSW 2007, Australia.
authors.forename: Guoxiu
authors.initials: G
authors.lastname: Wang