Efficient\nVisible-Light-Driven Photocatalytic Hydrogen Evolution on Phosphorus-Doped\nCovalent Triazine-Based Frameworks

Abstract

Seeking\nefficient visible-light-driven photocatalysts for water splitting\nto produce H₂ has attracted much attention. Chemical doping\nis an effective strategy to enhance photocatalytic performance. Herein,\nwe reported phosphorus-doped covalent triazine-based frameworks (CTFs)\nfor photocatalytic H₂ evolution. Phosphorus-doped CTFs\nwere fabricated by a facile thermal treatment using easily available\nred phosphorus as the external phosphorus species. The introduction\nof phosphorus atoms into the frameworks modified the optical and electronic\nproperty of CTFs, thus promoting the generation, separation, and migration\nof photoinduced electron–hole pairs. Consequently, the photocatalytic\nH₂-production efficiency of phosphorus-doped CTFs was greatly\nimproved, which was 4.5, 3.9, and 1.8 times as high as that of undoped\nCTFs and phosphorus-doped g-C₃N₄ calcined from\nmelamine and urea, respectively.