Synchronizing proton and electron transfer via hydrogen-bond bridging between carboxylated nanocellulose and C3N5 for efficient H2O2 photosynthesis.

Here, we report a hydrogen-bond bridging strategy to combine carboxylated nanocellulose (f-CNF) with nitrogen-rich carbon nitride (C3N5). This strategy constructs a hydrogen-bond network that spatially facilitates the transfer of photogenerated charge carriers and the rapid supply of protons through interactions with C3N5. More critically, the carboxyl-rich f-CNF serves as an efficient proton donor to drive the directional migration of protons from f-CNF to C3N5, accurately enriching electron accumulation sites with protons and achieving synchronous conversion of protons and electrons. As a result, the catalyst presents a high H2O2 production rate of 1473 µmol L-1 h-1.