Highly efficient Bi2O3/MoS2 p-n heterojunction photocatalyst for H2 evolution from water splitting |
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| Affiliation: | 1. Institute of Science, Engineering, and Technology (ICET), Federal University of the Jequitinhonha and Mucuri Valleys (UFVJM), Campus Mucuri, Teófilo Otoni 39803-371, Minas Gerais, Brazil;2. Federal University of Itajubá (UNIFEI), Campus Itabira, Itabira 35903-087, Minas Gerais, Brazil;3. Institute of Chemistry, Federal University of Uberlândia (UFU), Uberlândia 38400-902, Minas Gerais, Brazil;1. Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia;2. Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia;1. School of Advanced Chemical Sciences, Shoolini University, Solan, HP 173229, India;2. Laboratory of Energy and Environmental Science, Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam;3. Faculty of Environmental Chemical Engineering, Duy Tan University, Da Nang 550000, Vietnam;4. Advanced Materials and Processes Research Institute, Bhopal, M.P, India;5. Faculty of Biotechnology, Binh Duong University, Thu Dau Mot, Vietnam;6. Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam;7. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam;8. Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia;9. Chemistry Department, King Abdulaziz University, Jeddah 21589, Saudi Arabia;10. Department of Biotechnology, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamilnadu, India;11. Department of Materials Science and Engineering, Institute of Green Manufacturing Technology, Korea University, 145, Anam-ro Seongbuk-gu, Seoul 02841, South Korea;1. College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China;2. College of Chemical Engineering, Huaqiao University, Xiamen 361021, China;3. Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, Huaqiao University, Xiamen 361021, China |
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| Abstract: | The design of p-n heterojunction photocatalysts to overcome the drawbacks of low photocatalytic activity that results from the recombination of charge carriers and narrow photo-response range is promising technique for future energy. Here, we demonstrate the facile hydrothermal synthesis for the preparation of Bi2O3/MoS2 p-n heterojunction photocatalysts with tunable loading amount of Bi2O3 (0–15 wt%). The structure, surface morphology, composition and optical properties of heterostructures were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV–visible absorption spectroscopy, Brunauer-Emmett-Teller (BET) surface area, photoluminescence (PL), electrochemical impedance spectroscopy (EIS). Compare to pure Bi2O3 and MoS2, the Bi2O3/MoS2 heterostructures displayed significantly superior performance for photocatalytic hydrogen (H2) production using visible photo-irradiation. The maximum performance for hydrogen evolution was achieved over Bi2O3/MoS2 photocatalyst (10 μmol h?1g?1) with Bi2O3 content of 11 wt%, which was approximately ten times higher than pure Bi2O3 (1.1 μmol h?1g?1) and MoS2 (1.2 μmol h?1g?1) photocatalyst. The superior performance was attributed to the robust light harvesting ability, enhanced charge carrier separation via gradual charge transferred pathway. Moreover, the increased efficiency of Bi2O3/MoS2 heterostructure photocatalyst is discussed through proposed mechanism based on observed performance, band gap and band position calculations, PL and EIS data. |
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| Keywords: | Photocatalysis p-n heterojunction |
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