题目:Synergistic effect of S–doping and nitrogen–vacancy engineering on 2D/3D S–scheme photocatalyst for efficient photosynthesis of H₂O₂ 

作者: Chunyuan Chen，Zhongliao Wang，Ying Ma*，Bo Weng*，Shifu Chen，Sugang Meng*

单位：Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, Anhui Provincial Key Laboratory of Synthetic Chemistry and Applications, School of Chemistry and Chemical Engineering, Huaibei Normal University, Huaibei 235000, Anhui, China.

摘要: The green photocatalytic synthesis of hydrogen peroxide (H₂O₂) has attracted considerable attention as an environmentally friendly approach. However, issues such as the rapid recombination of photogenerated charge carriers, dependency on sacrificial agents, and low activity and selectivity of photocatalytic H₂O₂ remain major challenges in this field. An S–scheme photocatalyst Vr–CNS/ZIS composed of N vacancy–tailored, sulfur-modified graphitic carbon nitride (Vr–CNS) and Zn₂In₂S₅ (ZIS) enabled solar–driven H₂O₂ synthesis, achieving a rate of 475.6 μmol g^-1 h^-1 in pure water and air without sacrificial agents. This represents a 5–fold enhancement over pristine graphitic carbon nitride (g–C₃N₄). S doping mainly altered the electronic structure of g–C₃N₄, resulting in band gap narrowing and a redshift of the absorption edge. N vacancies (N_V) not only promoted charge separation and reduced charge transfer resistance, but also accelerated surface reactions. Moreover, N_V lowered the O₂ adsorption energy barrier, accelerated the rate–determining step of the reaction. The S–scheme heterojunction retained the strong reduction ability of Vr–CNS and the robust oxidation capability of ZIS. N_V strengthened the electronic coupling between Vr–CNS and ZIS after heterojunction contact. The synergistic effect of defect engineering (sulfur doping coupled with nitrogen vacancies) and the S–scheme accelerated the reaction kinetics, promoting migration and separation of photogenerated carriers. This study provides an effective strategy for designing multifunctional photocatalysts using the synergy between defect engineering and S–scheme heterojunctions.

分区情况: SCI 一区

影响因子: 17.7

年、卷、页: 2026, 82, 278-291

链接: //doi.org/10.1016/S1872-2067(26)64957-1

（文、图：马颖   /   审核：刘理华  /  审校：孟令国  /  终审：赵娟）