The development of efficient and durable earth-abundant electrocatalysts for the oxygen reduction reaction (ORR) is an ongoing challenge. In this work, we directly anchored CoS nanocatalysts (20 wt%) on different supports, namely, carbon nanotubes (CNTs) and reduced graphene oxide by a single-pot hydrothermal route. The developed synthesis processes enabled us to alter the composite nature of CoS by changing the sulfur precursor used. The corresponding electrocatalytic performance of these composite catalysts toward the ORR was studied in alkaline medium. The increase in the effective electrode surface area that accompanies the CoS nanocomposite substantially boosts its ORR catalytic performance. The CoS-CNT-Cy hybrid material shows an onset potential of 0.85 V, which is 60–200 mV less negative than that of other catalysts tested. The catalytic current density achieved with the hybrid material at 0.2 mg cm⁻² is comparable with that of commercial Pt/C (20%). The synergistic effect of CNTs and CoS enhances the overall performance of the hybrid catalyst. Extension of this nanocomposite strategy to other earth-abundant materials could similarly enable inexpensive electrocatalysts that lack the high intrinsic activity of the noble metals.

开发用于氧还原反应（ORR）的高效，耐用的富含地球的电催化剂是一项持续的挑战。在这项工作中，我们通过单锅水热法将CoS纳米催化剂（20 wt％）直接锚固在不同的载体上，即碳纳米管（CNTs）和还原的氧化石墨烯。发达的合成工艺使我们能够通过改变所使用的硫前体来改变CoS的复合性质。在碱性介质中研究了这些复合催化剂对ORR的相应电催化性能。伴随CoS纳米复合材料的有效电极表面积的增加大大提高了其ORR催化性能。CoS-CNT-Cy杂化材料的起始电势为0.85 V，与其他测试的催化剂相比，其负电势低60-200 mV。^-2与商用Pt / C的可比性（20％）相当。CNT和CoS的协同作用增强了杂化催化剂的整体性能。将此纳米复合材料策略扩展到其他富含地球的材料可以类似地实现廉价的电催化剂，而该催化剂缺乏贵金属的高固有活性。