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Surface disorder engineering in ZnCdS for cocatalyst free visible light driven hydrogen production

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Abstract

Metal chalcogenide solid solution, especially ZnCdS, has been intensively investigated in photocatalytic H2 generation due to their cost-effective synthetic procedure and adjustable band structures. In this work, we report on the defect engineering of ZnCdS with surface disorder layer by simple room temperature Li-ethylenediamine (Li-EDA) treatment. Experimental results confirm the formation of unusual Zn and S dual vacancies, where rich S vacancies (VS) served as electron trapping sites, meanwhile Zn vacancies (VZn) served as hole trapping sites. The refined structure significantly facilitates the photo charge carrier transfer and improves photocatalytic properties of ZnCdS. The disordered ZnCdS shows a highest photocatalytic H2 production rate of 33.6 mmol·g−1·h−1 under visible light with superior photocatalytic stabilities, which is 7.3 times higher than pristine ZnCdS and 7 times of Pt (1 wt.%) loaded ZnCdS.

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Acknowledgements

This work is supported by National Natural Science Foundation of China (Nos. 21902104 and 21701135), Natural Science Foundation of Top Talent of SZTU (Nos. 2019205, 2019108101003, and 20200201), Foundation for Young Innovative Talents in Higher Education of Guangdong (No. 2018KQNCX401), the Shenzhen Science and Technology Research Project (No. JCYJ20180508152903208), and the Open Project Program of Key Laboratory for Analytical Science of Food Safety and Biology, Ministry of Education (No. FS2004).

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Ha, E., Ruan, S., Li, D. et al. Surface disorder engineering in ZnCdS for cocatalyst free visible light driven hydrogen production. Nano Res. 15, 996–1002 (2022). https://doi.org/10.1007/s12274-021-3587-5

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