Giant onsite electronic entropy enhances the performance of ceria for water splitting
Abstract
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.
- Authors:
-
[1];
[2];
[3];
- 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)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1395468
- Grant/Contract Number:
- AC52-07NA27344; FG02-07ER46433
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Computational methods; Electronic structure; Energy modelling
Citation Formats
Naghavi, S. Shahab, Emery, Antoine A., Hansen, Heine A., Zhou, Fei, Ozolins, Vidvuds, and Wolverton, Chris. Giant onsite electronic entropy enhances the performance of ceria for water splitting. United States: N. p., 2017.
Web. doi:10.1038/s41467-017-00381-2.
Naghavi, S. Shahab, Emery, Antoine A., Hansen, Heine A., Zhou, Fei, Ozolins, Vidvuds, & Wolverton, Chris. Giant onsite electronic entropy enhances the performance of ceria for water splitting. United States. https://doi.org/10.1038/s41467-017-00381-2
Naghavi, S. Shahab, Emery, Antoine A., Hansen, Heine A., Zhou, Fei, Ozolins, Vidvuds, and Wolverton, Chris. Fri .
"Giant onsite electronic entropy enhances the performance of ceria for water splitting". United States. https://doi.org/10.1038/s41467-017-00381-2. https://www.osti.gov/servlets/purl/1395468.
@article{osti_1395468,
title = {Giant onsite electronic entropy enhances the performance of ceria for water splitting},
author = {Naghavi, S. Shahab and Emery, Antoine A. and Hansen, Heine A. and Zhou, Fei and Ozolins, Vidvuds and Wolverton, Chris},
abstractNote = {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.},
doi = {10.1038/s41467-017-00381-2},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {Fri Aug 18 00:00:00 EDT 2017},
month = {Fri Aug 18 00:00:00 EDT 2017}
}
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