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Phase-Modificate Defects Engineering CdS Sphalerite-Wurtzite System for Efficient Photocatalytic H₂ Evolution under Visible Light Irradiation

Zhou, Chengxin, Yang, Haowei, Chen, Jinwei, Wang, Gang, Jiang, Chunping, Wang, Ruilin
Industrial & engineering chemistry process design and development 2018 v.57 no.43 pp. 14365-14376
absorbance, absorption, hydrogen, hydrogen production, irradiation, nanoparticles, nanosheets, photocatalysis, photocatalysts, process design
According to quantum size effect and interface defects theory, the phase-modificate defects engineering photocatalyst MoS₂/CdS-1/CdS-2 with smaller lattice mismatch degree was successfully designed through simple hydrothermal and solvothermal methods, in which sphalerite CdS-1 was nanoparticle (NP) while wurtzite CdS-2 was nanosheet (NS) shaped. The results showed H₂ evolution activity was increased, which was about 20 times and 30 times those of MoS₂/CdS-1 and MoS₂/CdS-2, respectively. Also of note, it was 600 times and 900 times compared to CdS-1 and CdS-2, respectively. According to the calculation results, there were less interface states because of smaller lattice mismatch degree. The absorbance was enhanced by realizing more than once it reflects and absorbs ray. The scope of ray absorption was extended on account of the quantum scale effect. It is hoped to fundamentally enhance the photocatalytic activity of CdS through self-modifying and defects engineering.