Although transition metal oxides are important potential catalytic cathode materials for Li-O₂ batteries (LOBs), their poor cycle durability at high current density, high overpotentials and side reaction are still the challenges to solve. Herein, CeO₂/Co₃O₄ nanowire arrays grown on Ni foam were fabricated as a free standing cathode of LOBs, featuring a controllable discharge/charge products evolution route. CeO₂ served as active sites for nucleation, initial growth and decomposition of Li₂O₂. The embedded CeO₂ nanocrystalline on Co₃O₄ substrate dominated the initial discharge/charge product evolution with multi-formation kinetics of crystal Li₂O₂ and Li_2-xO₂ at high current densities which leading to low overpotentials and efficient decomposition of discharge products. Owing to the stable structure, the CeO₂/Co₃O₄ nanowires were found to energetically favor the mass transport between the electrode/electrolyte interface during long cycle testing. As a consequence, excellent cyclability of 500 cycles at high current density (500 mA g⁻¹) under a fixed capacity of 500 mA h g⁻¹ with low overpotentials of 0.2 V and 1.0 V for discharge/charge process (after 500 cycles) were achieved. The present work provides a new strategy and intrinsic insight in designing high-performance metal oxides electrocatalysts with a fine-tuned structure for LOBs.

尽管过渡金属氧化物是Li-O ₂电池（LOB）的重要潜在催化阴极材料，但是它们在高电流密度，高过电势和副反应下的较差的循环耐久性仍然是要解决的挑战。在此，将在Ni泡沫上生长的CeO ₂ / Co ₃ O ₄纳米线阵列制造为LOB的独立阴极，其特征在于可控的放电/电荷产物释放路径。CeO ₂充当Li ₂ O ₂成核，初始生长和分解的活性位点。Co ₃ O ₄上嵌入的CeO ₂纳米晶体在高电流密度下，基质以晶体Li ₂ O ₂和Li _2-x O _2的多形成动力学主导了初始放电/电荷产物的演化，这导致了低过电位和放电产物的有效分解。由于结构稳定，因此在长周期测试期间，发现CeO ₂ / Co ₃ O ₄纳米线在能量上有利于电极/电解质界面之间的质量传输。结果，在500 mA hg ^-1的固定容量下，在高电流密度（500 mA g ^-1）下具有500个循环的出色循环能力在放电/充电过程中（经过500次循环），具有0.2 V和1.0 V的低过电位。本工作为设计具有精细调整的LOB的高性能金属氧化物电催化剂提供了新的策略和内在的见解。