One-step synthesis of Mo and S co-doped porous g-C3N4 nanosheets for efficient visible-light photocatalytic hydrogen evolution

Abstract

Herein, the doping effect of Mo and S on photocatalytic H2 generation activity of g-C3N4 under visible light irradiation is investigated. By using a simple one-step heating technology, Mo and S co-dopedporous g-C3N4nanosheets were successfully prepared. The sublimation of sulfur powders promotes the formation of porous g-C3N4 nanosheets with large specific surface area. The Mo and S co-doped g-C3N4 exhibits efficient visible-light water splitting hydrogen evolution with the noble metallic cocatalyst free. The optimized Mo/S/g-C3N4-10 photocatalyst exhibits an extraordinary photocatalytic H2 evolution rate of 294 μmol g-1h−1 under visible light irradiation (λ > 420 nm). The co-doping of S and Mo extends the optical response range of g-C3N4. The doping process and electron transport path are analyzed in details. Mo and S co-dopedporous g-C3N4catalysts also exhibit outstanding cycling stability. This work may inspire the facile synthesis of photocatalyst for efficient visible-light water splitting hydrogen evolution.