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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Hierarchical mesoporous/macroporous Co3O4 ultrathin nanosheets as free-standing catalysts for rechargeable lithium-oxygen batteries
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Hierarchical mesoporous/macroporous Co3O4 ultrathin nanosheets as free-standing catalysts for rechargeable lithium-oxygen batteries

机译：层状介孔/大体积Co3O4超薄纳米片作为可再充电锂氧电池的独立催化剂

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摘要

Hierarchical mesoporous/macroporous Co3O4 ultrathin nanosheets were synthesized as free-standing catalysts for rechargeable Li-O-2 batteries. The Co3O4 nanosheets were directly grown on nickel foam through a simple hydrothermal reaction, followed by a calcination process. The impact of solvents used in the hydrothermal reaction on the morphology of catalysts has been investigated. The results showed that the prepared Co3O4 catalyst synthesized with ethylene glycol and deionized water (1 : 1 in volume) presented a much better electrochemical performance with a capacity of 11 882 mA h g(-1) under a current density of 100 mA g(-1) during the initial discharge and good cycling stability (more than 80 cycles at 200 mA g(-1) with the capacity limited to 500 mA h g(-1)). Meanwhile, the charge potential was significantly reduced to ca. 3.7 V. It is interesting to find that the morphology of the discharge product, Li2O2 could be changed by controlling the shape of catalysts. The impacts of the hierarchical mesoporous/macroporous nanosheet structure on the performance of Li-O-2 batteries have been discussed.
机译：合成了介孔/大孔的Co3O4超薄纳米片作为可充电Li-O-2电池的独立式催化剂。通过简单的水热反应，然后进行煅烧过程，将Co3O4纳米片直接在泡沫镍上生长。已经研究了在水热反应中使用的溶剂对催化剂形态的影响。结果表明，用乙二醇和去离子水（体积比为1：1）合成的Co3O4催化剂在电流密度为100 mA g（-）时的电化学性能更好，容量为11882 mA hg（-1）。 1）在初始放电期间和良好的循环稳定性（200 mA g（-1）时超过80个循环，容量限制为500 mA hg（-1））。同时，充电电位显着降低至约。 3.7V。有趣的是发现放电产物Li2O2的形态可以通过控制催化剂的形状来改变。讨论了分级介孔/大孔纳米片结构对Li-O-2电池性能的影响。

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