Degradable ultrathin high-performance photocatalytic hydrogen generator from porous electrospun composite fiber membrane with enhanced light absorption ability

Abstract

Poly(L-lactide) (PLA)/TiO₂/Pt composite fiber membrane with an internal porous channel structure was fabricated by skillfully tuning the breath figure mechanism and vapor-induced phase separation mechanism with solute and solvent matching via one-step electrospinning and applied in photocatalytic hydrogen production for the first time. The unique structure enhances the light absorption ability of the composite fiber and endows it with excellent photocatalytic hydrogen production performance. The hydrogen production efficiency of functional TiO₂ particles loaded on the composite was increased 30 times compared with the efficiency of TiO₂ particles in the aqueous solution, thus leading to 1.8 times increase in the hydrogen production capability and 5.8 times increase in the quantum efficiency compared with that of the TiO₂/Pt control sample. The composite fiber membrane was further assembled into an ultrathin (1.5 mm) and degradable hydrogen energy generator with a high power density of 47 W m⁻² and a high UV luminous energy conversion rate of 92.8% under simulated sunlight.