Fabrication and enhanced visible-light photocatalytic H₂ production of B-doped N-deficient g-C₃N₄/CdS Hybrids with robust 2D/2D hetero-interface interaction

Abstract

2D layered photocatalysts with proper electronic structure have sparked much attention in the field of visible-light photocatalysis for H2 production. Herein, by simply calcining the mixture of ultrathin g-C3N4 (CNN) and NaBH4, heteroatom B and N defect were simultaneously introduced into g-C3N4. The obtained modified g-C3N4 (BDCNN) was further coupled with 2D flower-like CdS nanosheet. The optimal 2D/2D BDCNN/CdS-15% heterojunction behaved ideal photocatalytic activity for H2 revolution by water splitting, and the highest H2 revolution rate was as high as 1013.8 molg-1h-1, which was 6.7 times, 2 times, and 5.8 times of the corresponding values of pristine CNN, BDCNN and CdS respectively. It was evidenced that the band structure of 2D/2D BDCNN/CdS-15% was well tuned for better visible-light adsorption and higher separation efficiency of photo-induced carriers for enhancing H2 revolution performance. The achievement in this study provided informative principles for exploring g-C3N4 based heterojunctions with higher H2-production performance.

In Situ Photodeposition of Au Nanoparticle Plasma: Enhanced Defect-State g-C3N4 Photocatalytic Hydrogen Evolution

“…Graphite carbon nitride (g-C 3 N 4 ) is a photocatalytic material with a layered structure that stands out among many photocatalysts for its chemical stability, harmlessness, and inexpensiveness. − The conventional g-C 3 N 4 during calcination at high temperature presents a stacked body structure, which has the disadvantages of a small specific surface area, low crystallinity, and few trap centers for photogenerated electrons and holes. − Therefore, its fast carrier recombination and low charge migration efficiency result in a poor performance in photocatalytic hydrogen production. For this reason, various modification schemes for g-C 3 N 4 have been developed.…”