アルカリ性媒体中での電気触媒的全体水分解を実現する多重界面およびヘテロ接合を構築するためのMo₂Cの導入：NiFe層状二重水酸化物

Developing cost-effective, high-performance, and stable electrocatalysts for the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) remains a key challenge for the utilization of hydrogen energy. Herein, the heterostructure catalyst composed of NiFe-LDH coupled with Mo₂C materials and carbon nanospheres (NiFe/MC/C) is synthesized via a two-step integrated strategy. Benefiting from the tunable electronic structure of NiFe-LDH and the suitable hydrogen binding energy of MC materials, the synergistic effect between multi-interfaces and heterojunctions significantly enhances the water splitting performance of NiFe-LDH. The optimized catalyst affords low overpotentials of 232 mV for the OER and 151 mV for the HER at a current density of 10 mA cm^-2 in 1 M KOH. The cell voltage required for the 1.0NiFe/MC/C electrolytic cell is only 1.68 V at a current density of 50 mA cm^-2. The enhanced water splitting performance stems from the interfacial active sites, abundant channels, and significantly improved electrical conductivity. DFT calculations show that the rate-determining step energy barrier of NiFe-LDH/Mo₂C (1.66 eV) is significantly lower than that of NiFe-LDH (1.90 eV), thereby enhancing its OER performance. This research presents a facile and effective strategy for constructing multicomponent and high-performance electrocatalysts for overall water splitting.