Atomic‐Level La‐Modulated NiFeP Bifunctional Electrocatalysts for High Efficiency Overall Water Splitting

Abstract Rare‐earth La‐modulated NiFeP composites were prepared via a facile co‐precipitation route followed by in situ phosphatization of La‐doped NiFe‐LDH precursors. Benefiting from the optimized electronic structure, the La0.3‐NiFeP catalyst demonstrates remarkable hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance. In 1 M KOH, this catalyst delivers 10 mA cm −2 at overpotentials of only 97 mV (HER) and 271 mV (OER), while demonstrating excellent operational durability. When configured as a dual‐electrode water electrolyzer, La0.3‐NiFeP divers overall water splitting at 10 mA cm −2 with a low cell voltage of 1.59 V and retains performance for over 24 hours, surpassing most reported transition metal‐based electrocatalysts.