Giant onsite electronic entropy enhances the performance of ceria for water splitting
Journal Article
·
· Nature Communications
- Northwestern Univ., Evanston, IL (United States). Department of Materials Science and Engineering
- Technical University of Denmark (Denmark). Department of Energy Conversion and Storage
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Yale Univ., New Haven, CT (United States). Department of Applied Physics; Yale Energy Sciences Institute, West Haven, CT (United States)
Previous studies have shown that a large solid-state entropy of reduction increases the thermodynamic efficiency of metal oxides, such as ceria, for two-step thermochemical water splitting cycles. In this context, the configurational entropy arising from oxygen off-stoichiometry in the oxide, has been the focus of most previous work. Here we report a different source of entropy, the onsite electronic configurational entropy, arising from coupling between orbital and spin angular momenta in lanthanide f orbitals. We find that onsite electronic configurational entropy is sizable in all lanthanides, and reaches a maximum value of ≈4.7 kB per oxygen vacancy for Ce4+/Ce3+ reduction. This unique and large positive entropy source in ceria explains its excellent performance for high-temperature catalytic redox reactions such as water splitting. Our calculations also show that terbium dioxide has a high electronic entropy and thus could also be a potential candidate for solar thermochemical reactions.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC52-07NA27344; FG02-07ER46433
- OSTI ID:
- 1395468
- Alternate ID(s):
- OSTI ID: 1400078
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 8; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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