Co₄S₃/Co₉S₈ nanosheets, Co-based sulfides with mixed crystalline phase, were first successfully prepared via solvothermal approach combined with ultrasonic exfoliation. Fe³⁺ ions were then doped into the Co₄S₃/Co₉S₈ nanosheets to form Fe-doped Co₄S₃/Co₉S₈ by a simple one-step impregnation method. The results of oxygen evolution reaction (OER) activities in alkaline media show that the Fe³⁺ doping can significantly reduce the oxygen evolution overpotential and Tafel slope, and the optimum feeding mole ration of Fe/Co is 30%. Following that, Cr³⁺ ions were further doped into 30% Fe-doped Co₄S₃/Co₉S₈ nanosheets to form bimetallic heteroatom co-doped dopant. Compared with the undoped, Fe-doped, and Cr-doped Co₄S₃/Co₉S₈ nanosheets, the testing of OER activity implies that Fe/Cr co-doped Co₄S₃/Co₉S₈ nanosheets have the most excellent electrocatalytic properties with a overpotential of 350 mV at ƞ₁₀ and a small Tafel slope of 39.72 mV dec⁻¹, and have an outstanding stability. Both the OER performance and stability decreased by the order of Fe/Cr co-doped Co₄S₃/Co₉S₈ nanosheets > Fe (Cr)-doped Co₄S₃/Co₉S₈ nanosheets > undoped Co₄S₃/Co₉S₈ nanosheets, the enhanced mechanisms of which were investigated by XPS, XRD, and SEM.

Co ₄ S ₃ /Co ₉ S ₈纳米片，具有混晶相的钴基硫化物，首先通过溶剂热法结合超声剥离成功制备。然后通过简单的一步浸渍法将Fe ³⁺离子掺杂到Co ₄ S ₃ /Co ₉ S ₈纳米片中以形成Fe掺杂的Co ₄ S ₃ /Co ₉ S _{8 。}碱性介质中的析氧反应（OER）活性结果表明，Fe ³⁺ doping can significantly reduce the oxygen evolution overpotential and Tafel slope, and the optimum feeding mole ration of Fe/Co is 30%. Following that, Cr³⁺ ions were further doped into 30% Fe-doped Co₄S₃/Co₉S₈ nanosheets to form bimetallic heteroatom co-doped dopant. Compared with the undoped, Fe-doped, and Cr-doped Co₄S₃/Co₉S₈ nanosheets, the testing of OER activity implies that Fe/Cr co-doped Co₄S₃/Co₉S₈纳米片具有最优异的电催化性能，在ƞ ₁₀时的过电势为350 mV， Tafel 斜率为39.72 mV dec ^-1，具有出色的稳定性。OER性能和稳定性均按Fe/Cr共掺杂Co ₄ S ₃ /Co ₉ S ₈纳米片> Fe（Cr）掺杂Co ₄ S ₃ /Co ₉ S ₈纳米片>未掺杂Co ₄ S ₃的顺序降低/Co ₉ S ₈纳米片，通过XPS、XRD和SEM研究了其增强机制。