Experimental Study and Optimization Analysis of Operating Conditions on Photo-Thermochemical Cycle of Water Splitting for Hydrogen Production Based on CeO<sub>2</sub> Catalyst
The photo-thermochemical cycle (PTC) for water splitting offers a sustainable method for hydrogen production by efficiently utilizing solar energy. This study explored the use of CeO<sub>2</sub> as a catalyst in the PTC system to enhance hydrogen yield. A nanostructured CeO<sub>2&l...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/17/24/6314 |
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| Summary: | The photo-thermochemical cycle (PTC) for water splitting offers a sustainable method for hydrogen production by efficiently utilizing solar energy. This study explored the use of CeO<sub>2</sub> as a catalyst in the PTC system to enhance hydrogen yield. A nanostructured CeO<sub>2</sub> catalyst was synthesized via the sol-gel method, achieving an H<sub>2</sub> yield of 8.35 μmol g<sup>−1</sup> h<sup>−1</sup>. Stability tests over five cycles showed consistent yields between 7.22 and 8.35 μmol g<sup>−1</sup> h<sup>−1</sup>. Analysis revealed that oxygen vacancies (V<sub>O</sub>s) increased after the photoreaction and depleted during the thermal reaction, which aligns with the expected PTC mechanism for hydrogen production. Single-factor experiments highlighted that photoreaction duration mainly influenced V<sub>O</sub>s generation, while thermal duration and temperature impacted V<sub>O</sub>s consumption and intermediate reaction rates. A response surface methodology (RSM) model predicted optimal conditions for maximum H<sub>2</sub> yield (8.85 μmol g<sup>−1</sup> h<sup>−1</sup>) with a photoreaction duration of 46.6 min, thermal duration of 45.4 min, and thermal temperature of 547.2 °C. |
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| ISSN: | 1996-1073 |