title: Single crystalline Co3O4 nanocrystals exposed with different crystal planes for Li-O2 batteries.
abstract: Single crystalline Co3O4 nanocrystals exposed with different crystal planes were synthesised, including cubic Co3O4 nanocrystals enclosed by {100} crystal planes, pseudo octahedral Co3O4 enclosed by {100} and {110} crystal planes, Co3O4 nanosheets exposed by {110} crystal planes, hexagonal Co3O4 nanoplatelets exposed with {111} crystal planes, and Co3O4 nanolaminar exposed with {112} crystal planes. Well single crystalline features of these Co3O4 nanocrystals were confirmed by FESEM and HRTEM analyses. The electrochemical performance for Li-O2 batteries shows that Co3O4 nanocrystals can significantly reduce the discharge-charge over-potential via the effect on the oxygen evolution reaction (OER). From the comparison on their catalytic performances, we found that the essential factor to promote the oxygen evolution reactions is the surface crystal planes of Co3O4 nanocrystals, namely, crystal planes-dependent process. The correlation between different Co3O4 crystal planes and their effect on reducing charge-discharge over-potential was established: {100} < {110} < {112} < {111}.
authors.affiliation: 1] Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia [2] Centre for Clean Energy Technology, School of Chemistry and Forensic Science, University of Technology Sydney, Broadway, Sydney, NSW 2007, Australia.
authors.forename: Dawei
authors.initials: D
authors.lastname: Su
authors.affiliation: Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia.
authors.forename: Shixue
authors.initials: S
authors.lastname: Dou
authors.affiliation: Centre for Clean Energy Technology, School of Chemistry and Forensic Science, University of Technology Sydney, Broadway, Sydney, NSW 2007, Australia.
authors.forename: Guoxiu
authors.initials: G
authors.lastname: Wang