BiOCl Atomic Layers with Electrons Enriched Active Sites Exposed for Efficient Photocatalytic CO2 Overall Splitting

作者：Ting Peng, Yiqing Wang, Chung‐Li Dong, Ta Thi Thuy Nga, Binglan Wu, Yi Wang, Qingqing Guan, Wenjie Zhang, Shaohua Shen · 发表于：Nano-Micro Letters · 年份：2025 · DOI：10.1007/s40820-025-01723-2 · 被引用次数：25 · 研究领域：Advanced Photocatalysis Techniques、Perovskite Materials and Applications、Covalent Organic Framework Applications

Abstract Given the limited exposure of active sites and the retarded separation of photogenerated charge carriers in those developed photocatalysts, photocatalytic CO 2 splitting into value-added chemicals has suffered from the poor activity and remained in great challenge for real application. Herein, hydrothermally synthesized BiOCl with layered structure (BOCNSs) was exfoliated into thickness reduced nanosheets (BOCNSs-w) and even atomic layers (BOCNSs-i) via ultrasonication in water and isopropanol, respectively. In comparison with the pristine BOCNSs, the exfoliated BiOCl, especially BOCNSs-i with atomically layered structure, exhibits much improved photocatalytic activity for CO 2 overall splitting to produce CO and O 2 at a stoichiometric ratio of 2:1, with CO evolution rate reaching 134.8 µmol g −1 h −1 under simulated solar light (1.7 suns). By surpassing the photocatalytic performances of the state-of-the-art Bi l O m X n (X: Cl, Br, I) based photocatalysts, the CO evolution rate is further increased by 99 times, reaching 13.3 mmol g −1 h −1 under concentrated solar irradiation (34 suns). This excellent photocatalytic performance achieved over BOCNSs-i should be benefited from the shortened transfer distance and the increased built-in electric field intensity, which accelerates the migration of photogenerated charge carriers to surface. Moreover, with oxygen vacancies (V O ) introduced into the atomic layers, BOCNSs-i is exposed with the electrons enriched Bi active...