Volume 21, Issue 3 2408057
Research Article

Ni Vacancy and the Se/S Ratio Regulate the p-Band Center of Hollow NiSxSe2-x/Phase Junction CdS to Achieve High Efficiency and Broad-Spectrum Photocatalytic Performance

Ning Li

Corresponding Author

Ning Li

Key Laboratory of Heavy Oil Processing, China University of Petroleum Beijing, No. 18 Fuxue RD, Beijing, 102249 China

Department of Materials Science and Engineering, College of New Energy and Material, China University of Petroleum Beijing, No. 18 Fuxue RD, Beijing, 102249 China

E-mail: [email protected]; [email protected]

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Yanping Qiu

Yanping Qiu

Department of Materials Science and Engineering, College of New Energy and Material, China University of Petroleum Beijing, No. 18 Fuxue RD, Beijing, 102249 China

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Linping Li

Linping Li

Department of Materials Science and Engineering, College of New Energy and Material, China University of Petroleum Beijing, No. 18 Fuxue RD, Beijing, 102249 China

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Jiatong Zhang

Jiatong Zhang

Department of Materials Science and Engineering, College of New Energy and Material, China University of Petroleum Beijing, No. 18 Fuxue RD, Beijing, 102249 China

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Yangqin Gao

Yangqin Gao

Department of Materials Science and Engineering, College of New Energy and Material, China University of Petroleum Beijing, No. 18 Fuxue RD, Beijing, 102249 China

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Lei Ge

Corresponding Author

Lei Ge

Key Laboratory of Heavy Oil Processing, China University of Petroleum Beijing, No. 18 Fuxue RD, Beijing, 102249 China

Department of Materials Science and Engineering, College of New Energy and Material, China University of Petroleum Beijing, No. 18 Fuxue RD, Beijing, 102249 China

E-mail: [email protected]; [email protected]

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First published: 24 November 2024
Citations: 1

Abstract

Rational design of defect engineering and interfacial built-in electric fields of photocatalysts is imperative for renewable energy conversion. Herein, a multi-strategy involving the introduction of Ni vacancies, the adjustment of the Se/S ratio, and the construction of dual junctions are employed to simultaneously realize NiSxSe2-x/phase junction CdS (HCC) an excellent photocatalytic activity and broad light absorption. With the help of VNi and the regulation of S/Se, the local electrons are redistributed to occupy more antibonding orbitals and adjust the p-band center, thus optimizing the H* adsorption energy of the catalyst to accelerate the photocatalytic reaction kinetics. Meanwhile, the synergistic effects of phase junction and heterojunction formations generate dual built-in electric fields (BIEF), which further amplify the stepwise separation and migration of photogenerated carriers. Notably, VNi-NiSSe/HCC achieves an optimal H2 evolution rate of 11.43 mmol·g−1·h−1 under visible light irradiation with the apparent quantum yield (AQY) at 15.3% at 420 nm, which is 53 times and 26.6 times higher than H-CdS and HCC, respectively. Additionally, it also exhibits a hydrogen evolution rate of 147 µmol·g−1·h−1 under near-infrared (NIR) light with λ ≥780 nm. This work provides new insight into designing robust photocatalysts by regulating the electronic states and energy states.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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