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Anthony Mapp


Postgraduate research student

My publications

Publications

Jakubczyk E.M., Mapp A., Chung C.C., Sansom C.L., Jones J.L., 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 Elsevier
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.