材料科学
光催化
超短脉冲
电子转移
电子
化学物理
化学工程
氢
光化学
工程物理
纳米技术
光电子学
光学
催化作用
核物理学
物理
工程类
量子力学
激光器
化学
生物化学
作者
Yi Li,Shan Yu,Yuehan Cao,Yue Huang,Qiaohao Wang,Duan Yuangang,Lina Li,Kaibo Zheng,Ying Zhou
标识
DOI:10.1016/j.jmst.2024.01.021
摘要
Maximizing ultrafast electron-transfer kinetics in semiconductor is pivotal but challenging for high-efficiency solar-to-energy during the photocatalytic reaction process due to the intrinsic property of photocatalysts with low surface electron density. Herein, a model photocatalyst CdS@Mo is synthesized through a typical hydrothermal method for modulating the ultrafast electron-transfer to enhance the surface electron density. X-ray absorption spectra (XAS) reveal that Mo is coordinated with S atoms to form a Mo-S6 configuration which is different from common MoS2 and Mo foil structures. Based on the femtosecond transient absorption spectra (fs-TAS), it is found that the formation of Mo-S6 configuration contributes to the fast decay of CdS signal and Mo-S6 signal reactivation, illustrating the ultrafast electron-transfer (∼2.2 ps) from CdS to Mo-S6 configuration, which achieves the enhanced electron density of photocatalyst surface. Finally, a holistic photocatalytic performance evaluation discloses that the growing of Mo-S6 configuration obviously improves the photocatalytic hydrogen evolution (PHE) efficiency of CdS from 28.5 to 47.5 mmol g–1 h–1 with a solar-to-hydrogen (STH) efficiency of 0.086% which is seldomly discussed in the system containing sacrificial agents. This work opens a new path to modulate the surface electron density by turning the ultrafast electron-transfer for enhancing reaction efficiency in electron-density-dependent systems.
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