Towards chemical equilibrium in thermochemical water splitting. Part 1: Thermal reduction

Alberto de la Calle, Ivan Ermanoski, Ellen B. Stechel

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The efficiency of many processes strongly depends on their thermodynamic reversibility, i.e., proximity to equilibrium throughout the process. In thermochemical cycles for water and/or carbon dioxide splitting, thermochemical air separation, and thermochemical energy storage, operating near equilibrium means that the oxygen chemical potential of the solid and gas phases must not differ significantly. We show that approaching this ideal is possible in thermal reduction only if the reaction step occurs at a specific, reaction coordinate- and material-dependent temperature. The resulting thermal reduction temperature profile also depends on the ratio of gas and solid flows.

Original languageEnglish (US)
Pages (from-to)10474-10482
Number of pages9
JournalInternational Journal of Hydrogen Energy
Issue number19
StatePublished - Mar 1 2022


  • Counter-current reactor
  • Hydrogen generation
  • Redox reaction
  • Solar thermal
  • Thermochemical water splitting

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology


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