Highly efficient and low-cost catalysts are greatly desirable for oxygen reduction reaction (ORR) in the cathode of metal-air batteries. Herein, a novel Co_1-xS/C-3/N-KB catalyst is prepared by a facile process with cheap raw materials. The electrocatalytic performance of Co_1-xS/C-3/N-KB for ORR are investigated systematically. As results, Co_1-xS/C-3/N-KB exhibits a half-wave potential of 0.72 V and a limiting current density of 6.0 mA·cm⁻², comparable to the commercial Pt/C. Moreover, by means of Koutecky–Levich and RRDE techniques, the catalyst is confirmed to catalyze ORR at a four-electron pathway. Besides, chronoamperometric studies indicate a better catalytic stability of Co_1-xS/C-3/N-KB than that of Pt/C with the current density retention rates of 93.4% and 88.3%, respectively. In addition, during the accelerated durability test, Co_1-xS/C-3/N-KB shows only 11.5 mV negative shift of half-wave potential after 5000 cycles, even better than Pt/C (34.6 mV negative shift). When used as cathode catalyst for primary Al-air battery, the Co_1-xS/C-3/N-KB catalyst exhibited excellent discharge voltage and better stability than Pt/C. The excellent ORR catalytic activity and stability of Co_1-xS/C-3/N-KB can be due to the synergistic effect between the Co_1-xS/C active sites and the N-KB support, which is not only beneficial to oxygen adsorption but also promotes efficient electron transfer, thus facilitating the oxygen reduction process. Besides, the coated/doped carbon and doped nitrogen in Co_1-xS/C particles also have certain contribution, enhancing the electronic conductivity and catalytic stability, therefore facilitating the electronic transfer inside Co_1-xS/C active particles during the oxygen reduction process.

对于金属-空气电池的阴极中的氧还原反应（ORR），非常需要高效且低成本的催化剂。在此，通过廉价的原料，通过简便的方法制备了新型的Co _1-x S / C-3 / N-KB催化剂。系统地研究了Co _1-x S / C-3 / N-KB对ORR的电催化性能。结果，与商业Pt / C相比，Co _1-x S / C-3 / N-KB表现出0.72 V的半波电位和6.0 mA·cm ^-2的极限电流密度。此外，借助Koutecky-Levich和RRDE技术，已证实该催化剂可在四电子路径上催化ORR。此外，计时电流分析表明，Co _1-x具有更好的催化稳定性。S / C-3 / N-KB比Pt / C高，电流密度保持率分别为93.4％和88.3％。此外，在加速耐久性试验中，Co _1-x S / C-3 / N-KB在5000次循环后仅显示11.5 mV的半波电势负移，甚至优于Pt / C（34.6 mV负移）。当用作一次铝制空气电池的阴极催化剂时，Co _1-x S / C-3 / N-KB催化剂比Pt / C表现出优异的放电电压和更好的稳定性。Co _1-x S / C-3 / N-KB的出色的ORR催化活性和稳定性可以归因于Co _1-x之间的协同作用S / C活性位和N-KB载体，不仅有利于氧的吸附，而且还促进了有效的电子转移，从而促进了氧的还原过程。此外，Co _1-x S / C颗粒中的包覆/掺杂碳和掺杂氮也有一定贡献，增强了电子电导率和催化稳定性，从而促进了氧期间Co _1-x S / C活性颗粒内部的电子转移。还原过程。