Visible-Light-Driven Photocatalytic H2O2 Production on g-C3N4 Loaded with CoP as a Noble Metal Free Cocatalyst

Graphical A CoP-decorated g-C 3 N 4 composite catalyst was developed for highly efficient and stable photocatalytic production of H 2 O 2 under visible-light irradiation. The CoP nanoparticles act as a noble metal free cocatalyst for g-C 3 N 4 to enhance the visible-light absorption and promote the separation of photogenerated charge carriers. A composite catalyst combining CoP with g-C 3 N 4 was explored for the photocatalytic production of H 2 O 2 under visible-light irradiation. The composite catalyst was fabricated by growth of CoP nanoparticles on the surface of g-C 3 N 4 . The CoP nanoparticles were well dispersed on the surface of g-C 3 N 4 and could interact with g-C 3 N 4 to improve charge separation and electron transfer. The composite catalyst showed superior catalytic activity compared with pure CoP or g-C 3 N 4 under visible-light irradiation. The optimal catalyst with 1.76 wt.-% CoP loading exhibited the best photocatalytic efficiency with an H 2 O 2 production of 140 µ m in 2 h, which is about 4.6 and 23.3 times those of pure g-C 3 N 4 and pure CoP, respectively. A possible mechanism for the visible-light-driven photocatalytic production of H 2 O 2 is proposed. The composite catalyst exhibited stable performance without obvious loss of catalytic activity after seven successive runs, and thus has good application prospects in sustainable H 2 O 2 production.