Synergistically Active Piezoelectrical H O Production Composite Film Achieved from a Catalytically Inert PVDF-HFP Matrix and SiO Fillers.

Local and decentralized H O production via a piezoelectrical process promises smart biological utilization as well as environmental benefits. However, stable, bio/environmentally safe, and easily applied H O generation materials are still lacking. Here, we report a novel flexible H O generation polymeric film composed of catalytically inert PVDF-HFP (Poly(vinylidene fluoride-co-hexafluoropropylene)) matrix and SiO nanoparticle fillers. The film is bio-/environmentally benign at resting states, but effectively produces H O upon ultrasonic motivation at a production rate of 492 μmol  in one hour. Experimental and simulation methods in combination indicate that the effective H O generation capabilities stem from the synergistic existence of piezoelectrical fields and the air-liquid-solid three-phase regions around the porous film. The chemical conversions are motivated by the adsorbed charges. The silicon hydroxyl groups properly stabilize the *OOH intermediate and facilitate the chemical conversions of 2e ORR of ambient O . We expect the report to inspire H O piezoelectrical generation materials and promote the novel production strategies of H O as well as piezoelectrical functional materials.