Schiff‐base‐rich g‐C x N ₄ supported PdAg nanowires as an efficient Mott–Schottky catalyst boosting photocatalytic dehydrogenation of formic acid

Developing an efficient photocatalyst, catalyzing formic acid (FA) dehydrogenation, can satisfy the demand of the H 2 energy. Herein, a graphitic carbon nitride (g‐C x N 4 )‐based nanosheet ( x = 3.2, 3.6 or 3.8) with melem rings conjugated by Schiff‐base bond (N=C–C=N) was synthesized, tuning the bandgaps ( E g ) of graphitic carbon nitride (g‐C 3 N 4 ) in the range of 1.8 < E g < 2.7 eV, and grown PdAg nanowires (NWs) on its surface forming an efficient PdAg NWs/g‐C x N 4 Mott–Schottky heterojunction for enhancing dehydrogenation photocatalysis of FA. The boosting photocatalysis benefits from the Schiff‐base bond tuning the E g of g‐C 3 N 4 and strongly coupling from the heterojunction. Among the heterojunction, the Pd 5 Ag 5 NWs/g‐C 3.6 N 4 exhibits the best dehydrogenation photocatalysis of FA [turnover frequency (TOF) = 1230 h −1 ] under visible light ( λ > 400 nm) without any additive at 25 °C, which is the best value among ever‐reported ones. This work provides a new strategy to boost dehydrogenation photocatalysis of FA, which will be promising for practical application of H 2 in future energy field.