Light-involved Li-O batteries have received widespread attention in recent years. However, slow reaction kinetics and high charge/discharge overpotentials at high current densities, as well as rapid recombination of photogenerated holes and electrons have hindered their further development. In this study, we propose a design strategy to grow FeO rice grains in situ on α-MoO nanorods to fabricate heterostructures for Li-O batteries at high current densities. The heterostructure α-MoO@FeO serves as dual-function cathode catalysts for light-involved Li-O batteries by facilitating oxygen reduction/oxidation reactions and enhancing the separation of photogenerated charges, thereby effectively improving photoelectrocatalytic performance. Under light irradiation conditions, the heterostructure α-MoO@FeO exhibits low charge/discharge overpotential (0.99 V) while demonstrating good cycling stability (stable cycling for 120 cycles at a high current density of 0.5 mA cm with a fixed capacity of 0.5 mAh cm) and good rate performance, which significantly better than that was reported the currently popular light-involved Li-O batteries under a high current density.

中文翻译：

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构建Fe2O3米粒修饰的MoO3纳米棒异质结构以提高光参与Li-O2电池的性能


近年来，光相关的锂氧电池受到了广泛的关注。然而，缓慢的反应动力学和高电流密度下的高充电/放电过电势，以及光生空穴和电子的快速复合阻碍了它们的进一步发展。在这项研究中，我们提出了一种设计策略，在 α-MoO 纳米棒上原位生长 Fe3O 米粒，以在高电流密度下制造锂氧电池的异质结构。异质结构α-MoO@FeO可作为光参与Li-O电池的双功能阴极催化剂，通过促进氧还原/氧化反应和增强光生电荷的分离，从而有效提高光电催化性能。在光照射条件下，异质结构α-MoO@FeO表现出较低的充放电过电位（0.99 V），同时表现出良好的循环稳定性（在0.5 mA cm的高电流密度下稳定循环120次，固定容量为0.5 mAh cm） ）和良好的倍率性能，在高电流密度下明显优于目前流行的光涉锂氧电池。