A low-temperature electro-thermochemical water-splitting cycle for hydrogen production based on LiFeO2/Fe redox pair |
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| Affiliation: | 1. School of Chemistry Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, PR China;2. College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, PR China;1. Department of Chemical and Biological Engineering, University of Colorado at Boulder, Boulder, CO 80309-0596, United States;2. Corporate Research and Innovation Center (CRI) at KAUST, Saudi Basic Industries Corporation (SABIC), Thuwal, Saudi Arabia;1. Chemical Engineering Department, Aristotle University of Thessaloniki, Thessaloniki, Greece;2. Laboratory of Inorganic Materials, Chemical Process and Energy Resources Institute, Center for Research and Technology Hellas, Thessaloniki, Greece;1. Department of Electrical Engineering, University of Gujrat, Hafiz Hayat Campus, Pakistan;2. Shifa College, Shifa Tameer Millat University (STMU), H-8/4, Islamabad, Pakistan;3. Department of Electrical Engineering, Iowa State University. Ames, IA 50011, USA;4. Department of Electrical Engineering, Comsats University Islamabad, Pakistan |
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| Abstract: | The thermochemical water-splitting cycles have been paid more attention in recent years because they directly convert thermal energy into stored chemical energy as H2. However, most thermochemical cycles require extremely high temperatures as well as a temperature switch between reduction and oxidation steps, which are the main obstacles for their development. Herein, we introduced an electrochemical reaction into the thermochemical cycle and established a novel two-step water-splitting cycle based on LiFeO2/Fe redox pair. The two-step water-splitting process involves a cyclic operation of electrochemical reduction and water-splitting steps. The feasibility of the water-splitting cycle for the hydrogen production was thermodynamically and experimentally investigated. A mechanism of hydrogen production based on LiFeO2/Fe redox pair was developed. Compared with the traditional high-temperature thermochemical cycles, the electrochemical reduction and water-splitting steps of the process can be isothermally operated in the same cell at a relatively low temperature of 500 °C. The main advantages of the cycle are not only easily available heat sources without involvement of the associated engineering and materials issues, but also without any temperature swings. This is a promising method to achieve water splitting for hydrogen production in the future. |
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| Keywords: | Electro-thermochemical cycle Water splitting Hydrogen production Redox pair Molten salt |
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