Journal of the Japan Institute of Energy
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ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753

Journal of the Japan Institute of Energy Vol. 100 (2021), No. 5

  • Hydrogen Production via Thermochemical Water Splitting Process by Alkali Metal Redox Cycle

    pp. 29-44

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    DOI:10.3775/jie.100.29

    In this review, the reaction cycles based on redox reactions of alkali metals such as lithium, sodium, and potassium are systematically investigated as a potential water splitting technology operated at lower temperature than 500 °C. Assuming that all the cycles are operated in thermodynamic equilibrium condition, more than 1000 °C is theoretically required. Thus, equilibrium shift using phase transition of alkali metals is performed to decrease the reaction temperatures. The operating temperature of the lithium cycle is 800 °C because such high temperature is necessary to obtain high vapor pressure. The potassium cycle is potentially water splitting operated below 500 °C. However, strong corrosion is serious problem to develop it as practical application. Among them, the sodium cycle reveals the lowest operating temperature, which is 400 °C. Therefore, the sodium cycle should be categorized as one of the potential water splitting technology.
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  • Tableof Contents (in English)

    p. Tce5_1

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    DOI:10.3775/jie.100.Tce5_1

  • Tableof Contents (in Japanese)

    p. Tcj5_1

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    DOI:10.3775/jie.100.Tcj5_1

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