Highly efficient and corrosion-resistant electrocatalysts for the seawater hydrogen evolution reaction (HER) are crucial for large-scale hydrogen production. Herein, Ni2P-Ni12P5 supported Os (Os/Ni2P-Ni12P5) is synthesized via an ultrafast and simple microwave quasi-solid approach within 30 s. The fabricated interface improves the electron transfer efficiency while metal-support interaction (MSI) between Os and Ni2P-Ni12P5 further optimizes the electronic structure, and then significantly expedites the HER process. It presents excellent performance in alkaline seawater with low overpotential of 17 mV to reach the current density of 10 mA cm-2. In simulated industrial conditions (1 M KOH + seawater) using anion exchange membrane water electrolyzer (AEMWE), the constructed Os/Ni2P-Ni12P5 || RuO2 cell system requires a small voltage of 2.06 V to achieve 1 A cm-2. And the cost calculation for the produced hydrogen reveals a low price of $ 0.92 per gallon of gasoline equivalent (GGE), well demonstrating its economic advantages for industrialized application. Moreover, it exhibits excellent durability in various stability measurements without significant current fluctuations. This work presents a corrosion-resistant electrocatalyst with enhanced price activity and mass activity for sustainable seawater electrolysis, paving the ways to design efficient electrocatalysts with diverse strategies from a novel vision.
