题目：Hollow heterojunction with dual-vacancy engineering to boost photocatalytic performance for photoreduction of CO₂ coupled with selective oxidation of benzyl alcohol to benzaldehyde

 作者：Chaohui Ruan * , Chengyu Wang , Yucheng Chen , Zhongliao Wang , Keting Wang, Ying Zhou , Sujuan Zhang , Gaoli Chen , Xiuzhen Zheng , Sugang Meng , Shifu Chen *

 单位：Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, Key Lab of Clean Energy and Green Circulation, College of Chemistry and Material Science, Huaibei Normal University, Huaibei 235000, People’s Republic of China

 摘要：CO₂ photoreduction into chemical fuels is hopeful and sustainable for a carbon–neutral future. Herein, a bifunctional dual-vacancy-modified hollow heterojunction photocatalyst is ingeniously designed for CO₂ photoreduction to CO coupling with selective oxidation of benzyl alcohol to benzaldehyde. Synergistic catalysis effect resulted from hollow heterostructures, TiO₂ with O vacancies (TiO_2-x) and Zn_0.3-xCd_0.7S with Zn vacancies (ZCS) leads to excellent photoreduction and photoxidation performances. The optimized sample (TiO_2-x/ZCS hollow sphere) exhibits highest photocatalytic activity of all the obtained samples. The yields of CO and benzaldehyde are 105 and 323.5 μmol g^–1 h⁻¹ , respectively. The construction of Z-scheme heterojunction realizes the spatial separation of redox reaction sites, and the dual-vacancy distributed on the heterojunction enhance the interfacial reactivity. Additionally, density functional theory calculation and in-situ technology reveal that Zn vacancy in ZCS and O vacancy in TiO_2-x function as active sites for the binding and activation of *COOH and *PhCH₂O^- , respectively, thereby stabilizing the crucial step in the formation of intermediates such as CO and benzaldehyde. This work enhances the utilization of photogenerated carrier, and affords a new opportunity to design hollow heterojunction with dual-vacancy engineering to boost photocatalytic performance for coupling reaction system.

 影响因子：8.2

 分区情况：一区

 链接： https://doi.org/10.1016/j.seppur.2024.127929

（文：阮朝晖 / 审核：韩满意 / 审校：曹静 / 终审：杨振兴）