Effect of TiO2 on high-temperature thermoelectric properties of ZnO

Park, K.; Ko, K.Y.

doi:10.1016/j.jallcom.2006.04.065

Cited by 72 publications

(33 citation statements)

References 38 publications

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“…However, these materials are not stable at elevated temperature, which has limited their high temperature applications. Comparatively, metal oxides such as ZnO [4,5], Ca Co O [6,7], and Na x CoO 2 [8,9] systems have been recognized as encouraging thermoelectric materials due to their lower cost, nonpoisonous, simple synthesis procedure and the anti-oxidization in oxidized atmosphere for long time. Na x CoO 2 consists of an electrically conductive CoO 2 layer and an insulating Na layer, which are aligned perpendicular to the c-axis.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of c-axis oriented Ni-substituted NaCoO2 thermoelectric oxide by the citric acid complex method

Wang

Zhao

2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of c-axis oriented Ni-substituted NaCoO2 thermoelectric oxide by the citric acid complex method

Wang

Zhao

2009

Journal of Alloys and Compounds

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“…Among the doped ZnO samples reported thus far, Al-doped ZnO exhibited the highest ZT value. [9][10][11][12][13][14][15][16][17] A relatively high thermal conductivity within the range of 20-40 WÁm À1 ÁK À1 at room temperature, generally observed in doped ZnO samples, prevents us from obtaining a considerably large ZT value. Therefore, it is very important to decrease the lattice thermal conductivity of ZnO-based materials for thermoelectric applications.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of Solution Combustion Synthesized Al-Doped ZnO

et al. 2008

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Thermoelectric properties of Al-doped ZnO prepared by solution combustion synthesis using urea as fuel and sintered by spark plasma sintering were investigated for developing an energy-and time-saving synthesis method to decrease its thermal conductivity without a significant deterioration in other thermoelectric properties. The desired materials were successfully synthesized and sintered. The thermoelectric properties of the synthesized products subjected to planetary ball milling (PBM) treatment before sintering were compared with those of synthesized products not subjected to PBM treatment; the results showed that the former products had a larger power factor and higher thermal conductivity than the latter products. The thermal conductivity of all as-synthesized products was in the range of 8.3-19.7 WÁm À1 ÁK À1 at room temperature, which was significantly lower than that of the products synthesized by a conventional solid-state reaction method. (Zn 0:99 Al 0:01 )O obtained by PBM had the highest dimensionless figure of merit ZT of 0.050 at 863 K. From these results, it is inferred that solution combustion synthesis is an effective method for synthesizing Al-doped ZnO with relatively low thermal conductivity for high-temperature thermoelectric applications.

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“…It has been reported that the thermoelectric properties of ZnO were enhanced with the introduction of additives such as Al 2 O 3 , TiO 2 , and SnO 2 [8][9][10][11][12]. In 1996, Ohtaki et al [8] fabricated (Zn 1−x Al x )O (0 ≤ x ≤ 0.01) ceramics by the solid-state reaction method and investigated their thermoelectric properties.…”

Section: Introductionmentioning

confidence: 99%

“…Since then, extensive studies have been carried out on metaladded ZnO thermoelectric materials [10][11][12]. Cai et al [10] prepared Al-added ZnO fine powders (0.1-2 m) by sol-gel processing, using zinc acetate, ammonia and Al 2 O 3 powders as starting materials.…”

Section: Introductionmentioning

confidence: 99%