Mesoporous anion-cation-codoped Co₉S₈ nanorings for enhanced electrocatalytic oxygen evolution reactions

Recently, the design and synthesis of Co₉S₈ micro/nanostructures have attracted attention as electrochemical energy storage and conversion devices due to their low cost and environmental friendliness. Herein, Co₉S₈ nanorings were synthesized via a one-step solvothermal method with the incorporation of Fe ions, subsequently, properly selenized to boost their electrocatalytic performance. The morphology and structure of the series of cation and anion regulated Co₉S₈ nanorings were characterized, the electrochemical oxygen evolution reaction (OER) properties were assessed. It is worth noting that the as-prepared catalysts, especially the innovative Fe and Se ions double doped Co₉S₈ nanorings, denoted as Se/Fe-Co₉S₈-0.14, exhibited good electrocatalytic OER performance with low overpotential (298 mV) and high durability under alkaline conditions. This work provides a new perspective to develop non-noble metal Co₉S₈-based OER electrocatalysts with a superior electrocatalytic performance.