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

Jakubczyk, E.M., Mapp, A., Chung, C.C., Sansom, C.L., Jones, J.L. and Dorey, R.A. (2019) Enhancing thermoelectric properties of NaCo2O4 ceramics through Na pre-treatment induced nano-decoration Journal of Alloys and Compounds, 788. pp. 91-101.

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Abstract

High 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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Jakubczyk, E.M.e.jakubczyk@surrey.ac.uk
Mapp, A.a.mapp@surrey.ac.uk
Chung, C.C.
Sansom, C.L.
Jones, J.L.
Dorey, R.A.r.dorey@surrey.ac.uk
Date : 5 June 2019
Funders : Engineering and Physical Sciences Research Council (EPSRC), European Commission
DOI : 10.1016/j.jallcom.2019.02.199
Copyright Disclaimer : © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : Ceramics; Thermoelectric materials; Oxide materials; Sol-gel processing; Scanning electron microscopy
Depositing User : Clive Harris
Date Deposited : 04 Mar 2019 09:24
Last Modified : 04 Mar 2019 09:26
URI: http://epubs.surrey.ac.uk/id/eprint/850608

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