Single crystalline Co<inf>3</inf>O<inf>4</inf>nanocrystals exposed with different crystal planes for Li-o<inf>2</inf>batteries

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Journal Article
Scientific Reports, 2014, 4
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Single crystalline Co3O4nanocrystals exposed with different crystal planes were synthesised, including cubic Co3O4nanocrystals enclosed by {100} crystal planes, pseudo octahedral Co3O4enclosed by {100} and {110} crystal planes, Co3O4nanosheets exposed by {110} crystal planes, hexagonal Co3O4nanoplatelets exposed with {111} crystal planes, and Co3O4nanolaminar exposed with {112} crystal planes. Well single crystalline features of these Co3O4nanocrystals were confirmed by FESEM and HRTEM analyses. The electrochemical performance for Li-o2batteries shows that Co3O4nanocrystals 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 Co3O4nanocrystals, namely, crystal planes-dependent process. The correlation between different Co3O4crystal planes and their effect on reducing charge-discharge over-potential was established: {100} < {110} < {112} < {111}.
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