“…Commercial acidic proton‐exchange‐membrane electrolyzers utilize Pt/C catalysts, but the scarcity of Pt greatly limits the large‐scale application; alkaline electrolyzers use low‐cost Ni catalysts, but suffer from low efficiency and corrosion . Consequently, active, cost‐effective, and robust electrocatalysts for hydrogen evolution reaction (HER) have been intensively pursued, such as metal‐free catalysts, single‐atom catalysts, transition‐metal chalcogenides, borides, carbides, nitrides, and phosphides (TMPs) . In particular, the easily adjustable electronic structure and surface properties of TMPs due to under‐coordinated P atoms, permit facile manipulation of HER performance .…”