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Nanoscale Stabilization of Sodium Oxides: Implications for Na–O2 Batteries
Abstract
The thermodynamic stability of materials can depend on particle size due to the competition between surface and bulk energy. In this Letter, we show that, while sodium peroxide (Na2O2) is the stable bulk phase of Na in an oxygen environment at standard conditions, sodium superoxide (NaO2) is considerably more stable at the nanoscale. As a consequence, the superoxide requires a much lower nucleation energy than the peroxide, explaining why it can be observed as the discharge product in some Na-O2 batteries. As the superoxide can be recharged (decomposed) at much lower overpotentials than the peroxide, these findings are important to create highly reversible Na-O2 batteries. We derive the specific electrochemical conditions to nucleate and retain Na-superoxides and comment on the importance of considering the nanophase thermodynamics when optimizing an electrochemical system.
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Gallavotti, G. (1999) · doi:10.1007/978-3-662-03952-6 · Cited by 647
Cited by
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Tran, R., Xu, Z., Radhakrishnan, B., Winston, D., Sun, W., Persson, K. A., & Ong, S. P. (2016) · Scientific Data · doi:10.1038/sdata.2016.80 · Cited by 1,047
Self-citationFrom lithium to sodium: Cell chemistry of room temperature sodium–air and sodium–sulfur batteries
Adelhelm, P., Hartmann, P., Bender, C. L., Busche, M., Eufinger, C., & Janek, J. (2015) · Beilstein Journal of Nanotechnology · doi:10.3762/bjnano.6.105 · Cited by 478
Emerging electrochemical energy conversion and storage technologies
Badwal, S. P. S., Giddey, S. S., Munnings, C., Bhatt, A. I., & Hollenkamp, A. F. (2014) · Frontiers in Chemistry · doi:10.3389/fchem.2014.00079 · Cited by 478
Metadata
- Authors
- Kang, S., Mo, Y., Ong, S. P., & Ceder, G.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-01-14
- Volume
- 14
- Issue
- 2
- Pages
- 1016-1020
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2148303646
- Cited by
- 173
- References
- 1
- FWCI
- 13.44
- Type
- journal article
- Language
- en
- Open access
- closed
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