Recently, Dr. Enna Ha and Prof. Junqing Hu reported a synthetic strategy of dual-vacancy solid solution nanoparticles for H2generation. This work was published in Nano Research entitled with “Surface disorder engineering in ZnCdS for cocatalyst free visiblelight driven hydrogen production” (DOI: 10.1007/s12274-021-3587-5).
Metal chalcogenide solid solution, especially ZnCdS, has been intensively investigated in photocatalytic H2generation 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 H2production rate of 33.6 mmol·g−1·h−1under visible light with superior photocatalytic stabilities, which is 7.3 times higher than pristine ZnCdS and 7 times of Pt (1 wt.%) loaded ZnCdS.This work enlightens the strategy of tuning the band structure of ternary sulfide solid solution for photocatalytic H2production through a solution processed modification with Li-EDA, which would be a novel and effective method for industrial applications.