Internal energy recycling in FAPbI₃/MXene for enhanced photocatalytic H₂ evolution

Carrier recombination is a significant impediment to efficient charge separation, thereby severely limiting the performance of photocatalytic systems. In this study, we feature an innovative internal energy cycling mechanism through the non-radiative fluorescence resonance energy transfer (FRET) between perovskite and MXene, to exploit the energy released by carrier recombination for enhancing H₂ evolution rate. Consequently, a rapid H₂ evolution rate of 2394 µmol g^-1 h^-1 under 1.5 AM simulated sunlight, from the composite of FAPbI₃/MXene/Pt, was acquired, which is more than one order of magnitude higher than that of FAPbI₃/Pt (64 µmol g^-1 h^-1). The innovative approach of FRET induced internal energy cycling will open up opportunities to design other novel heterogeneous catalytic materials and promote their application potential in various catalytic fields.