Efficiency maximization in solar-Thermochemical fuel production: Challenging the concept of isothermal water splitting

Ivan Ermanoski, J. E. Miller, M. D. Allendorf

    Research output: Contribution to journalArticle

    74 Scopus citations


    Widespread adoption of solar-Thermochemical fuel production depends on its economic viability, largely driven by the efficiency of use of the available solar resource. Herein, we analyze the efficiency of two-step cycles for thermochemical hydrogen production, with emphasis on efficiency. Owing to water thermodynamics, isothermal H2 production is shown to be impractical and inefficient, irrespective of reactor design or reactive oxide properties, but an optimal temperature difference between cycle steps, for which efficiency is the highest, can be determined for a wide range of other operating parameters. A combination of well-targeted pressure and temperature swing, rather than either individually, emerges as the most efficient mode of operation of a two-step thermochemical cycle for solar fuel production.

    Original languageEnglish (US)
    Pages (from-to)8418-8427
    Number of pages10
    JournalPhysical Chemistry Chemical Physics
    Issue number18
    StatePublished - May 14 2014


    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry

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