Sulfur vacancy and CdS phase transition synergistically boosting one-dimensional CdS/Cu2S/SiO2 hollow tube for photocatalytic hydrogen evolution |
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| Affiliation: | 1. Chemical Engineering College, Inner Mongolia University of Technology, Hohhot, 010051, People''s Republic of China;2. Inner Mongolia Key Laboratory of Industrial Catalysis, Hohhot, 010051, People''s Republic of China;3. Chemistry College, Baotou Teachers'' College, Baotou, 014030, People''s Republic of China;1. Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuito Exterior S/N, Coyoacan, 04510, Mexico City, Mexico;2. CONACYT-Universidad Autónoma Metropolitana, Departamento de Química, Av. San Rafael Atlixco 156, P.C. 09340, Mexico City, Mexico;3. Universidad Autónoma Metropolitana, Departamento de Química, Av. San Rafael Atlixco 156, P.C. 09340, México City, Mexico;1. Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan, Taiwan;2. Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, Taiwan;3. Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Keelung Branch, Keelung, Taiwan;1. Jinzhou Medical University, Jinzhou 121001, PR China;2. Key Laboratory of Functional Inorganic Material Chemistry, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, PR China;3. Northeast Normal University, Changchun 130024, PR China;1. Key Laboratory of Preparation and Applications of Environmental Friendly Materials of the Ministry of Education, Jilin Normal University, Changchun 130103, China;2. Key Laboratory of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130103, China;3. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China;4. College of Life Science, Jilin Normal University, Siping 136000, China |
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| Abstract: | Constructing an efficient photoelectron transfer route to improve carrier separation efficiency is crucial for photocatalytic hydrogen evolution. In this work, CdS/Cu2S/SiO2 heterostructure with one-dimensional hollow tube morphology was designed by the solvothermal method using CuO/SiO2 hollow tube as carrier. The hexagonal phase CdS and sulfur vacancies were adjusted simultaneously by the reduction strategy of NaBH4 aqueous solution. CdS/CuS/SiO2 with cubic phase CdS was synthesized in the absence of NaBH4 aqueous solution. CdS/Cu2S/SiO2 was characterized by SEM, TEM, XRD, XPS, SPV and so on. The results showed that hexagonal CdS and sulfur vacancies benefited the separation of photo-generated carriers. As a consequence, the CdS/Cu2S/SiO2-10 composite exhibited a high photocatalytic hydrogen production rate (1196.98 μmol/g/h), and its performance almost 7.18 times than that of CdS/CuS/SiO2. Moreover, CdS/Cu2S/SiO2-10 showed an excellent cyclic stability. This was attributed to the strong electron interaction of CdS/Cu2S/SiO2 heterostructure and the sulfur vacancy acted as an electron trap, enhancing the separation of photo-induced electrons and holes. |
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| Keywords: | Sulfur vacancy CdS phase Transition Photocatalytic hydrogen evolution |
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