Fabricating Inorganic/Organic S-Scheme Heterojunction for Efficient Photocatalytic Production of H₂ and H₂O₂

Enhancing the efficiency of photocatalytic H₂ evolution and H₂O₂ 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 Bi₂WO₆/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 H₂ evolution and H₂O₂ 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 H₂ and 2.33 and 2.27 times for H₂O₂ 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.