A Strongly Coupled Cluster Heterostructure with Pt–N–Mo Bonding for Durable and Efficient H2 Evolution in Anion-Exchange Membrane Water Electrolyzers

• A strongly coupled Pt/Mo2N heterostructure on nitrogen-doped reduced graphene oxide (Pt/Mo2N-NrGO) was synthesized using Pt-containing Anderson-type polyoxometalates as precursors, achieving strong interfacial Pt–N–Mo bonding. • The pronounced electronic coupling at the Pt/Mo2N cluster interface facilitates H2O decomposition through synergistic stabilization of Pt-H* and Mo-OH*, enhancing the kinetics of the rate-determining Volmer step in alkaline HER. • The optimized Pt/Mo2N-NrGO catalyst exhibits remarkably low overpotential, high mass activity, and exceptional long-term durability (>500 h at 1500 mA cm-2) in a practical anion-exchange membrane water electrolyzer (AEMWE). • Techno-economic analysis shows a levelized hydrogen production cost of $2.02 kg⁻1, meeting US DOE targets, demonstrating the potential for industrial green hydrogen production.