光催化
制氢
异质结
过氧化氢
分解水
材料科学
催化作用
半导体
氢
化学工程
纳米技术
化学
光化学
光电子学
有机化学
工程类
作者
Ben Chong,He Li,Baorong Xu,Guidong Yang
标识
DOI:10.1016/j.cattod.2022.05.020
摘要
Semiconductor-based photocatalytic water splitting is a promising technology to convert solar energy into chemical energy. However, the photocatalytic performance is seriously limited by the low photo-generated charge separation efficiency and high interfacial reaction resistance. Here, a hollow double-shell stacked [email protected]2S4 system was firstly constructed. The Pt and Co3O4 nanoparticles (NPs) as the hydrogen evolution and the hydrogen peroxide production cocatalysts were loaded on the inner surface and outer surface of [email protected]2S4 to obtain a novel Pt/[email protected]2S4/Co3O4 photocatalyst. Compared with the [email protected]2S4 and dual cocatalysts randomly incorporated [email protected]2S4/(Pt+Co3O4) sample, this well-designed photocatalyst shows high photocatalytic performance with hydrogen evolution rate and H2O2 production rate reached 8.53 mmol g−1 h−1 and 5.26 mmol g−1 h−1, respectively, which are 3.8 and 1.8 times higher than those of [email protected]2S4 sample. The enhanced photocatalytic performance can be attributed to the formation of compact heterojunction structure between the ultrathin double shells, which can promote the separation of electron-hole pairs due to its built-in field effect. Besides, the synergistic effect of spatially separated dual cocatalysts are beneficial to the migration of the photo-generated charges to the opposite direction and the suppression of the reverse reaction. This work would pave a way to design unique structure and high-performanced photocatalyts towards photocatalytic water splitting.
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