Construction of Nonmetallic p‐n Heterojunction With Face‐to‐Face Structure for Drastically Enhanced Photocatalytic Performance

Abstract It is still a great challenge to exploit high‐efficiency nonmetallic composite photocatalysts by structural design for improving H₂ production performance. Here, the nonmetallic p‐n heterojunctions with face‐to‐face structure are prepared via hydrothermal in‐situ polymerization of PEDOT on the surface of g‐C₃N₄. The face‐to‐face modification of PEDOT on g‐C₃N₄ not only broadens the response in the visible light region but also increases the electron delocalization of conjugated system, which results in improving the visible light harvest ability and separation efficiency of charge carriers. The obtained PEDOT/g‐C₃N₄ heterojunctions display the improved H₂ production activity, and the optimal H₂ production rate reaches up to 3636.6 μmol g⁻¹ h⁻¹ with QE value of 5.6% at 420 nm, which is 5.46 times higher than that of pure g‐C₃N₄ (665.8 μmol g⁻¹ h⁻¹).