Facile fabrication of pseudo-microspherical ZnO/CdS core-shell photocatalysts for solar hydrogen production by water splitting |
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| Affiliation: | 1. Department of Energy Engineering, Hanyang University, Seoul 133-791, Republic of Korea;2. Materials Research and Human Resources Development Center for New Generation Power Plant System, Hanyang University, Seoul 133-791, Republic of Korea;1. Department of Physics, V.V.Vanniaperumal College for Women, Virudhunagar, 626001, Tamilnadu, India;2. Department of Physics, V.H.N.Senthikumara Nadar College, Virudhunagar, 626001, Tamilnadu, India;1. Thin Films and Nanomaterials Laboratory, Department of Physics, Savitribai Phule Pune University, Pune 411 007, India;2. Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India;3. Technical Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India;1. Department of Chemistry, Bharathidasan Institute of Technology (BIT) Campus, Anna University, Tiruchirappalli 620024, India;2. Department of Physics, Bharathidasan Institute of Technology (BIT) Campus, Anna University, Tiruchirappalli 620024, India;1. College of Chemical Engineering, The Key Laboratory of the Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, No. 11 St. Economical and Technological Development Zone, Shenyang 110142, China;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua RD, Shenyang 110016, China;3. School of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei 230026, China;1. Department of Physics, University of Pune, Pune 411 007, India;2. Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India;3. Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India |
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| Abstract: | Photocatalytic hydrogen production attracts great attention due to its clean energy conversion and renewable usage. In order to achieve efficient charge separations in photocatalysts, pseudo-microspherical ZnO/CdS core-shell structures were fabricated by precipitation method. ZnO pseudo-microspheres of about 2 µm diameter were uniformly synthesized, and they were used as core materials covered with various amounts of CdS shell nanoparticles. The highest hydrogen production rate from as-prepared photocatalysts was 146 μmol g−1 h−1 at 63 wt% CdS content under one sun irradiation condition. After thermal treatments, it was much improved to 241.2 μmol g−1 h−1 at the same CdS content possibly due to the increased crystallinity and efficient charge flows with an aid of additional CdO component. Reproducibility of hydrogen production revealed stable mode of operation for three consecutive runs. Therefore, ZnO/CdS/CdO ternary photocatalyst systems provide efficient charge separations and electron flows for improving solar hydrogen production by suppressing electron-hole recombinations. |
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| Keywords: | Photocatalyst Thermal applications ZnO Core shell |
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