Enhancing thermoelectric properties of NaCo2O4 ceramics through Na pre-treatment induced nano-decoration

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dc.contributor.authorJakubczyk, E. M.
dc.contributor.authorMapp, A.
dc.contributor.authorChung, C. C.
dc.contributor.authorSansom, Christopher L.
dc.contributor.authorJones, J. L.
dc.contributor.authorDorey, Robert A.
dc.date.accessioned2019-03-04T14:20:14Z
dc.date.available2019-03-04T14:20:14Z
dc.date.issued2019-02-19
dc.description.abstractHigh quality NaCo2O4 thermoelectrics are challenging to process due to the volatile nature of Na, the slow densification kinetics, and degradation of NaCo2O4 above 900–950 °C leading to the formation of Na-poor second phases. Fine grained sol-gel derived powders have been used to enhance the densification kinetics while pre-treatment of the NaCo2O4 powder with NaOH, to provide a Na rich environment, has been shown to mitigate Na loss at elevated temperatures. While insufficient to compensate for Na loss at processing temperatures of 1000 °C and above, at lower temperatures it is able to enhance densification and facilitate the formation of complex crystal structures yielding low thermal conductivity (0.66 Wm−1K−1) coupled with high electrical conductivity (3.8 × 103 Sm−1) and a Seebeck coefficient of 34.9. The resultant room temperature power factor and ZT were 6.19 × 10−6 Wm−1K−2 and 0.0026, respectively.en_UK
dc.identifier.citationE.M. Jakubczyk, A. Mapp, C.C. Chung, et al., (2019) Enhancing thermoelectric properties of NaCo2O4 ceramics through Na pre-treatment induced nano-decoration. Journal of Alloys and Compounds, Volume 788, June 2019, pp. 91-101en_UK
dc.identifier.issn0925-8388
dc.identifier.urihttps://doi.org/10.1016/j.jallcom.2019.02.199
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/13960
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectCeramicsen_UK
dc.subjectThermoelectric materialsen_UK
dc.subjectOxide materialsen_UK
dc.subjectSol-gel processingen_UK
dc.subjectScanning electron microscopyen_UK
dc.titleEnhancing thermoelectric properties of NaCo2O4 ceramics through Na pre-treatment induced nano-decorationen_UK
dc.typeArticleen_UK

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