Bridging-nitrogen defects modified graphitic carbon nitride nanosheet for boosted photocatalytic hydrogen production

Reinforcing the visible photon absorption and charge separation are key issues to maximize photocatalytic performance of graphitic carbon nitride. Herein, holey bridging-nitrogen-defected nitride nanosheets were prepared through solid-state copolymerization subsequently thermal annealing with melamine hexamethylenetetramine as precursors. Numerous pores bridging nitrogen defects that embedded into thin-layer framework evidenced comprehensive characterization. The synthesized textural electronic structure enables significant improvement hydrogen production, optimized sample D-CNNS(0.3) representing a evolution rate 2497.1 ?mol?g?1?h?1 under light irradiation (? > 420 nm). This is about 10.4 41.1 folds compared pristine bulk nitride, respectively. Both experimental theoretical results demonstrate beneficial enhance photoabsorption, promote transfer. Together enlarged surface area, nanosheet shows dramatically improved quantum yield in region.