Sulfur and Phosphorus Co-Doped CoFeLDH/MXene Nanoarray Electrocatalyst for the Oxygen Evolution Reaction

The oxygen evolution reaction (OER) is crucial for producing hydrogen through electrochemical water splitting using renewable energy sources. To enhance hydrogen production efficiency, an electrocatalyst with high efficiency and stability for OER is necessary. Layered double hydroxides (LDHs) are among the most active electrocatalysts for alkaline OER, but LDHs suffer from poor conductivity, potential agglomeration, and low intrinsic activity. Herein, sulfur–phosphorus codoping of CoFeLDH/MXene (S,P-CoFeLDH/MXene) nanoarray hybrid electrocatalyst was developed using a stripped Ti3C2Tx MXene substrate through an in situ growth strategy and sulfur–phosphorus codoping. The S,P-CoFeLDH/MXene electrocatalyst demonstrated remarkable activity and stability against oxygen evolution in alkaline media, with a low overpotential of 305 mV at 10 mA cm–2 and a Tafel slope of 39 mV dec–1. Moreover, the overpotential decreased by only 1.3% after 2000 CV cycles, surpassing the noble metal RuO2 catalyst. This effective strategy introduces an idea for a hybrid electrocatalyst designed for oxygen evolution, and the direct preparation method lays the groundwork for its broad application.