Ring-shaped cavity anchor Pt to derive Pt/WO heterointerfaces for efficient hydrogen evolution in acidic water and seawater.

Developing novelplatinum (Pt)-based hydrogen evolution reaction (HER) catalysts with high activity and stability is significant for the ever-broader applications of hydrogen energy. However, achieving precise modulation of the ultrafine Pt nanoparticles coordination environment in conventional catalysts is challenging. In this work, we developed a unique "ring-shaped cavity induced" strategy to anchor the Pt through the ring-shaped cavity of polyoxometalates (POMs) NaHPWO (denoted as PW). The NaPt[PWO] (PtPW) was in-situ converted into abundant Pt/WO heterostructure with Pt (∼2 nm) and highly depressed Pt-O-W heterointerfaces. Pt/WO nanoparticles supported on highly conductive rGO exhibit superior HER activity. The overpotentials of the catalyst are only 2.8 mV and 4.7 mV at 10 mA·cm in acidic water and seawater, far superior to commercial 20 % Pt/C catalyst. Additionally, the catalyst can be stabilized at a current density of 30 mA·cm for 180 h. This study provides a feasible strategy for rational design of Pt-based catalysts for renewable energy applications.