MoS2-decorated ordered macroporous Fe2Mo3O8/MoO2 with heterogeneous structure as bifunctional electrocatalyst for efficient overall water splitting

The development of water-separation-performing, noble-metal-free, and cost-effective electrocatalysts is of the utmost importance. This work outlines the preparation of ordered, macroporous MoS 2 –Fe 2 Mo 3 O 8 /MoO 2 electrocatalysts with heterogeneous structures using pyrolysis and sulfidation methods. The resulting macroporous and heterogeneous structures feature more active sites and facilitate ion diffusion, thereby effectively improving the overall performance. The catalyst demonstrated excellent performance in both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) in a 1 M potassium hydroxide solution, requiring overpotentials of 213 and 60 mV, respectively, to achieve a current density of 10 mA cm −2 . Moreover, the MoS 2 –Fe 2 Mo 3 O 8 /MoO 2 -based electrolyzer only requires an output voltage of 1.49 V, exhibiting superior performance and long-term stability compared to commercial catalysts. This study introduces a novel approach for achieving a heterogeneous macroporous structure that can enhance electrocatalysis .