Here, a series of Fex[Formula: see text]S2 ([Formula: see text]–1) samples were synthesized by a hydrothermal approach. The bimetallic sulfides exhibited superior ORR and OER performances compared to the corresponding monometallic sulfides. Among all synthesized samples, the [Formula: see text][Formula: see text]S2 sample showed the best catalytic activities, indicating that the optimal properties were related to the combination amount. Similarly, thanks to the synergistic effect of bimetallic ions, the Li–O2 batteries with [Formula: see text][Formula: see text]S2 cathode catalysts displayed the highest initial charge/discharge capacities and best cycle performance compared with CoS2 and FeS2. Moreover, the cell with [Formula: see text][Formula: see text]S2/Super P electrode cycled for 70 times, while the cells with CoS2/Super P and FeS2/Super P electrode only reached 49 and 45 cycles, respectively, at a limited capacity of 500[Formula: see text]mAh/g at 100[Formula: see text]mA/g. These results demonstrated that the combination of different element ions could be an efficient strategy to facilitate the reaction rate of ORR and OER.

中文翻译：

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双金属硫化物 FexCo1−xS2 作为 Li-O2 电池的高效电催化剂

在这里，一系列 FeX[公式：见正文]S2（[公式：见正文]–1）样品通过水热法合成。与相应的单金属硫化物相比，双金属硫化物表现出优异的 ORR 和 OER 性能。在所有合成样本中，[公式：见正文][公式：见正文]S2样品表现出最好的催化活性，表明最佳性能与结合量有关。同样，由于双金属离子的协同作用，Li-O2[公式：见正文][公式：见正文]S的电池2与 CoS 相比，阴极催化剂表现出最高的初始充电/放电容量和最佳循环性能2和 FeS2. 此外，带有[公式：见文本][公式：见文本]S的单元格2/Super P 电极循环 70 次，而 CoS 的电池2/Super P 和 FeS2/Super P电极在500[公式：见正文]mAh/g的极限容量下分别仅达到49和45个循环[公式：见正文]mA/g。这些结果表明，不同元素离子的组合可能是促进 ORR 和 OER 反应速率的有效策略。