Fabricating Inorganic/Organic S-Scheme Heterojunction for Efficient Photocatalytic Production of H ₂ and H ₂ O ₂

Enhancing the efficiency of photocatalytic H 2 evolution and H 2 O 2 production through heterojunction engineering is crucial for addressing energy sustainability and environmental challenges. In this context, constructing S-scheme heterojunctions has emerged as a promising strategy. Here, we report an inorganic/organic S-scheme Bi 2 WO 6 /zinc(II) tetrakis(4-carboxy-phenyl)porphyrin (BWO/ZTP) heterojunction with a strong built-in electric field, constructed via an interface induction strategy. The optimal BWO/ZTP-1 achieves exceptional H 2 evolution and H 2 O 2 production activity, achieving 2,343.3 and 236.1 μmol·g −1 ·h −1 . These represent remarkable enhancements of 14.9 and 3.44 times for H 2 and 2.33 and 2.27 times for H 2 O 2 over pristine BWO and Zn-TCPP. By using femtosecond transient absorption spectroscopy, Kelvin probe force microscopy, in situ x-ray photoelectron spectroscopy and density functional theory, we demonstrate that built-in electric field is pivotal for the exceptional performance, which leads to the proposal of a photocatalytic mechanism. This work provided feasible insights and references for the design of novel and superior inorganic/organic S-scheme heterojunction photocatalysts with tight contact and synergistic interaction for photocatalytic applications.