Synthesis of novel CoxMo1-xS-Cd0.5Zn0.5S composites with significantly improved photocatalytic hydrogen evolution performance under visible-light illumination |
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| Affiliation: | 1. State Key Laboratory of Heavy Oil Processing, College of New Energy and Materials, China University of Petroleum Beijing, 102249, PR China;2. Department of Materials Science and Engineering, College of New Energy and Materials, China University of Petroleum Beijing, 102249, PR China;1. Institute of Physics of Materials AS CR, v.v.i., Zizkova 22, CZ-61662 Brno, EU, Czech Republic;2. CEITEC-Institute of Physics of Materials, AS CR, Zizkova 22, CZ-61662 Brno, EU, Czech Republic;3. CEITEC-Brno University of Technology, Purkynova 123, CZ-61662 Brno, EU, Czech Republic;1. Tianjin Key Lab. of Indoor Air Environmental Quality Control, School of Environmental Science and Engineering, Tianjin University, Tianjin, 300354, PR China;2. College of Food Science and Engineering, Tianjin Agricultural University, Tianjin, 300384, PR China;1. School of Chemistry and Chemical Engineering, Key Laboratory of Electrochemical Energy Conversion Technology and Application, North Minzu University, Yinchuan, 750021, PR China;2. Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, 750021, PR China;1. Department of Chemistry, Shandong University, Jinan 250100, China;2. College of Science, China University of Petroleum (East China), Qingdao 266580, China;1. State Key Laboratory of Heavy Oil Processing, College of New Energy and Materials, China University of Petroleum Beijing, No. 18 Fuxue Rd., Beijing 102249, People’s Republic of China;2. Department of Materials Science and Engineering, College of New Energy and Materials, China University of Petroleum Beijing, No. 18 Fuxue Rd., Beijing 102249, People’s Republic of China |
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| Abstract: | Recently, MoS2 incorporates with Co2+ (or Ni2+) was found to increase the photocatalytic performance of semiconducting materials more effectively. In this study, novel CoxMo1-xS was effectively deposited on the surface of Zn0.5Cd0.5S semiconductors as an efficient promotor using in-situ hydrothermal process. The as-prepared CoxMo1-xS-Zn0.5Cd0.5S composites are examined by the following techniques: XRD, TEM, DRS, XPS, PL and TRPL. The photocatalytic hydrogen evolution performance under visible illumination over Zn0.5Cd0.5S is remarkably increased by adding cheap CoxMo1-xS as promotor. The CoxMo1-xS-Zn0.5Cd0.5S hybrid specimen with 10% molar amount illustrates the best catalytic performance with a homologous hydrogen generation rate of 188.65 μmol h−1, which is estimated to be 14.5 folds than that of unmodified Zn0.5Cd0.5S specimen in the presence of visible light. The apparent quantum yield of Co0.3Mo0.7 Zn0.5Cd0.5S sample is determined to be 16.72% at monochromatic light of 420 nm. The experimental outcomes indicate that the synergistic action between CoxMo1-xS and Zn0.5Cd0.5S obviously promotes transfer of photo-induced charge carriers in the hybrid sample. A reasonable catalytic mechanism for the increased photocatalytic performance of CoxMo1-xS promotor was presented and authenticated by TRPL measure, which would present a new notion for the design of ideal semiconductors with plummy photocatalytic capability. |
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| Keywords: | Photocatalytic water splitting Hydrogen production |
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