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Abstract The intrinsic charge carriers’ recombination and excited states decay greatly suppress the active species survival and photo(electro)catalytic performance. Inspired by Z‐scheme strategy, the polymeric nitrogen‐rich carbon nitride/cadmium sulfide (g‐C 3 N 5 /CdS) core–shell heterojunction is constructed to optimize photocatalytic performance. The optimal hydrogen production rate of g‐C 3 N 5 /CdS heterojunction catalyst under visible light without adding extra cocatalyst is up to 7860 µmol h −1 g −1 , which is 3 and 71 times higher than that of pure CdS and g‐C 3 N 5 photocatalysts, respectively. The femtosecond transient absorption spectroscopy is employed to observe the kinetic decay of carriers in the heterojunction, revealing the ultrafast charge trapping process (τ 1 = 52.3 ps) and long‐lived excited states (τ 3 = 1109.2 ps) in g‐C 3 N 5 /CdS photocatalyst. Meanwhile, density functional theory calculation results comprehensively suggest the promoted charge separation in heterojunction. Cost‐effective Z‐scheme g‐C 3 N 5 /CdS photocatalyst in this work shows a great potential for sustainable and high‐efficiency solar‐to‐H 2 conversion.
Wang et al. (Sat,) studied this question.