Experimental Study and Optimization Analysis of Operating Conditions on Photo-Thermochemical Cycle of Water Splitting for Hydrogen Production Based on CeO 2 Catalyst

Zhiyin Zhang, Huimin Hu, Jie Yang, Zhengguang He, Kai Yan, Tianyu Liu and Chang Wen ()
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Zhiyin Zhang: Power China HuBei Electric Engineering Co., Ltd., Wuhan 430040, China
Huimin Hu: Power China HuBei Electric Engineering Co., Ltd., Wuhan 430040, China
Jie Yang: Power China HuBei Electric Engineering Co., Ltd., Wuhan 430040, China
Zhengguang He: Power China HuBei Electric Engineering Co., Ltd., Wuhan 430040, China
Kai Yan: Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Tianyu Liu: Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Chang Wen: Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2024, vol. 17, issue 24, 1-17

Abstract: 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 2 as a catalyst in the PTC system to enhance hydrogen yield. A nanostructured CeO 2 catalyst was synthesized via the sol-gel method, achieving an H 2 yield of 8.35 μmol g −1 h −1 . Stability tests over five cycles showed consistent yields between 7.22 and 8.35 μmol g −1 h −1 . Analysis revealed that oxygen vacancies (V O 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 O s generation, while thermal duration and temperature impacted V O s consumption and intermediate reaction rates. A response surface methodology (RSM) model predicted optimal conditions for maximum H 2 yield (8.85 μmol g −1 h −1 ) with a photoreaction duration of 46.6 min, thermal duration of 45.4 min, and thermal temperature of 547.2 °C.

Keywords: water splitting; photo-thermochemical; oxygen vacancy; hydrogen; CeO 2 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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