Enhanced Spin‐Polarized Electric Field Modulating p‐Band Center on Ni‐Doped CdS for Boosting Photocatalytic Hydrogen Evolution

Author:

Wu Fei1,Zhang Xinlei1,Wang Lei2,Li Guicun1,Huang Jianfeng3,Song Aili4,Meng Alan2,Li Zhenjiang1ORCID

Affiliation:

1. College of Materials Science and Engineering Qingdao University of Science and Technology Qingdao 266042 P. R. China

2. Key Laboratory of Optic‐electric Sensing and Analytical Chemistry for Life Science College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 P. R. China

3. School of Material Science and Engineering Shaanxi University of Science and Technology Xi'an 710021 P. R. China

4. Qingdao Huanghai University Qingdao 266000 P. R. China

Abstract

AbstractIt is a challenge to regulate charge separation dynamics and redox reaction kinetics at the atomic level to synergistically boost photocatalytic hydrogen (H2) 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 H2 evolution reaction. Accordingly, the Ni‐CdS photocatalyst shows a remarkably improved photocatalytic performance with an H2 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 H2 evolution activity.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Shandong Province

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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