Single crystalline Co3O4 nanocrystals exposed with different crystal planes for Li-o2 batteries

Authors

Dawei Su, University of WollongongFollow
S X. Dou, University of WollongongFollow
Guoxiu Wang, University of Technology SydneyFollow

RIS ID

93443

Publication Details

Su, D., Dou, S. & Wang, G. (2014). Single crystalline Co3O4 nanocrystals exposed with different crystal planes for Li-o2 batteries. Scientific Reports, 4 5767-1-5767-9.

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}.