Abstract We report a facile method to synthesise and modify porous Co3O4 nanosheets. The nanosheets are prepared by hydrothermal reaction and calcination, then reduced with an H2/Ar mixed gas at 250 °C within 1 min. The modification treatment generates oxygen vacancies and Co3O4/CoO interface structure. Electrochemical measurements show that the nanosheets (Co3O4-30) reduced for 30 s have excellent electrochemical performance. After the Co3O4-30 electrode was cycled 200 times under 0.5 Ag-1, the reversible capacity was 892 mAh g−1. A reversible capacity of 250 mAh g−1 can be achieved even at a higher current density of 5.0 Ag-1. The good lithium storage performance is attributed to oxygen vacancies and appropriate Co3O4/CoO interface structure. This study provides a facile strategy to construct improved transition metal oxide electrodes for energy storage and conversion.

中文翻译：

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多孔 Co3O4@CoO 复合纳米片作为改进的锂离子电池负极

摘要 我们报告了一种合成和改性多孔 Co3O4 纳米片的简便方法。纳米片通过水热反应和煅烧制备，然后在 250°C 下用 H2/Ar 混合气体在 1 分钟内还原。改性处理产生氧空位和 Co3O4/CoO 界面结构。电化学测量表明，还原 30 s 的纳米片 (Co3O4-30) 具有优异的电化学性能。Co3O4-30 电极在 0.5 Ag-1 下循环 200 次后，可逆容量为 892 mAh g-1。即使在 5.0 Ag-1 的更高电流密度下也可以实现 250 mAh g-1 的可逆容量。良好的锂存储性能归因于氧空位和适当的 Co3O4/CoO 界面结构。