期刊
ENERGY TECHNOLOGY
卷 10, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.202100222
关键词
hydrogen production; solar energy; thermochemical cycles; thermodynamic properties; water splitting
资金
- ARPA-E via the DAYS program [DE-AR0000991]
- ASU LightWorks(R)
- HydroGEN Advanced Water Splitting Materials Consortium, Energy Materials Network under the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Hydrogen and Fuel Cell Technologies Office [DE-EE0008090, DE-EE0008991]
Solar thermochemical hydrogen production is an efficient technology that stores intermittent solar energy in chemical bonds, requiring identification of redox-active metal oxides with high conversion efficiency. Thermodynamic properties play a critical role in material classification and future research on redox-active metal oxides.
Solar thermochemical hydrogen production is an attractive technology that stores intermittent solar energy in the form of chemical bonds. Efficient operation requires the identification of a redox-active metal oxide (MOx) material that can achieve high conversion of water to hydrogen at minimal energy input. Water splitting occurs by consecutive reduction and reoxidation reactions of MOx. MOx is reduced to MOx-delta and, in the second step, is reoxidized by water recovering the initial MOx and generate H-2. The material must reduce at temperatures achievable in concentrated solar receiver/reactors, while maintaining a thermodynamic driving force to split water. At equilibrium, extent of reduction depends on temperature and oxygen partial pressure, and in this analysis, a set of thermodynamic properties, namely, enthalpy and entropy of oxygen vacancy formation, is sufficient to represent MOx. Herein, a method to easily classify materials based on these thermodynamic properties under any condition of oxygen partial pressure and temperature is presented. This method is based on fundamental thermodynamic principles and is applicable for any redox material with known thermodynamic properties. Despite the simplicity of the method, it is believed that this analysis will support future research in targeting thermodynamic properties of redox-active metal oxides.
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