Phase Identification of the Layered Perovskite CexSr2- xMnO4 and Application for Solar Thermochemical Water Splitting

Debora R. Barcellos, Francisco G. Coury, Antoine Emery, Michael Sanders, Jianhua Tong, Anthony McDaniel, Christopher Wolverton, Michael Kaufman, Ryan O'Hayre*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Ruddlesden-Popper (layered perovskite) phases are attracting significant interest because of their unique potential for many applications requiring mixed ionic and electronic conductivity. Here we report a new, previously undiscovered layered perovskite of composition, CexSr2-xMnO4 (x = 0.1, 0.2, and 0.3). Furthermore, we demonstrate that this new system is suitable for solar thermochemical hydrogen production (STCH). Synchrotron radiation X-ray diffraction and transmission electron microscopy are performed to characterize this new system. Density functional theory calculations of phase stability and oxygen vacancy formation energy (1.76, 2.24, and 2.66 eV/O atom, respectively with increasing Ce content) reinforce the potential of this phase for STCH application. Experimental hydrogen production results show that this materials system produces 2-3 times more hydrogen than the benchmark STCH oxide ceria at a reduction temperature of 1400 °C and an oxidation temperature of 1000 °C.

Original languageEnglish (US)
Pages (from-to)7705-7714
Number of pages10
JournalInorganic chemistry
Volume58
Issue number12
DOIs
StatePublished - Jun 17 2019

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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