光催化
材料科学
电场
光化学
兴奋剂
偶极子
锐钛矿
载流子
带隙
可见光谱
光电子学
催化作用
化学
物理
有机化学
量子力学
生物化学
作者
Fei Wu,Xinlei Zhang,Lei Wang,Guicun Li,Jianfeng Huang,Aili Song,Alan Meng,Zhenjiang Li
出处
期刊:Small
[Wiley]
日期:2024-01-24
标识
DOI:10.1002/smll.202309439
摘要
Abstract It is a challenge to regulate charge separation dynamics and redox reaction kinetics at the atomic level to synergistically boost photocatalytic hydrogen (H 2 ) evolution. Herein, a robust Ni‐doped CdS (Ni‐CdS) photocatalyst is synthesized by incorporating highly dispersed Ni atoms into the CdS lattice in substitution for Cd atoms. Combined characterizations with theoretical analysis indicate that local lattice distortion and S‐vacancy of Ni‐CdS induced by Ni incorporation lead to an increased dipole moment and enhanced spin‐polarized electric field, which promotes the separation and transfer of photoinduced carriers. In this contribution, charge redistribution caused by enhanced internal electric field results in the downshift of the S p‐band center, which is conducive to the desorption of intermediate H* for boosting the H 2 evolution reaction. Accordingly, the Ni‐CdS photocatalyst shows a remarkably improved photocatalytic performance with an H 2 evolution rate of 20.28 mmol g −1 h −1 under visible‐light irradiation, which is 5.58 times higher than that of pristine CdS. This work supplied an insightful understanding that the enhanced polarization electric field governs the p‐band center for efficient photocatalytic H 2 evolution activity.
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