Developing lithium-oxygen batteries with high reversibility and long cyclability requires an electrocatalyst with superior catalytic activity and excellent stability to achieve an efficient cathode. Herein, a three-dimensional hierarchically porous carbon framework embedded with cobalt-iron-phosphide nanodots nanocomposite is fabricated via a lyophilization-pyrolysis-phosphorization process. The synthetic catalyst displays excellent performances towards both the oxygen reduction reaction and the oxygen evolution reaction. With our optimal sample, the half-wave potential for the oxygen reduction reaction is up to 0.83 V versus reversible hydrogen electrode, and its potential for the oxygen evolution reaction at a current density of 10 mA cm⁻² is as low as 1.53 V in 0.1 M KOH solution. The catalyst also exhibits improved electrochemical performances in a rechargeable lithium-oxygen battery, including a high specific capacity (11969 mAh g⁻¹ at 100 mA g⁻¹) and a long cycle life (141 cycles at a cut-off capacity of 1000 mAh g⁻¹). All of these results make our catalyst a promising candidate for the development of highly efficient electrocatalysts for the rechargeable lithium-oxygen batteries.

开发具有高可逆性和长循环性的锂氧电池需要具有优异的催化活性和优异的稳定性的电催化剂以实现有效的阴极。本文中，通过冻干-热解-磷化工艺制备了嵌入有钴-铁-磷化物纳米点纳米复合物的三维分层多孔碳骨架。合成催化剂对氧还原反应和氧释放反应均显示出优异的性能。使用我们的最佳样品，与可逆氢电极相比，氧还原反应的半波电势高达0.83 V，并且在10 mA cm ^-2的电流密度下其氧释放反应的电势在0.1 M KOH溶液中低至1.53V。该催化剂还显示出改善的可充电锂电池的氧的电化学性能，包括高的比容量（毫安11969克^-1在100mA克^-1）和长的循环寿命（141个循环的截止容量1000毫安的g ^-1）。所有这些结果使我们的催化剂成为开发可充电锂氧电池高效电催化剂的有前途的候选者。