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Issue 51, 2017
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An alternative, faster and simpler method for the formation of hierarchically porous ZnO particles and their thermoelectric performance

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Abstract

We devised an alternative, faster and simple method to prepare hierarchically nanoporous ZnO powders (NZnO) via a quick interfacial reaction (double emulsion) from the mixtures of zinc nitrate hexahydrate (solution, Zn(NO3)2·6H2O), n-hexane (C6H14), ammonium bicarbonate (NH4HCO3), Tween 80 (C64H124O26) and Span 80 (C24H44O6), which was calcined at 450 °C. Due to the micro/nanopore structures, the obtained NZnO powders had a larger surface area (∼69.7 m2 g−1) than the commercial ZnO powders. For the thermoelectric evaluation, the textured NZnO pellets (T-NZnOP) were prepared by low pressure spark plasma sintering (SPS) using the newly synthesized NZnO powders (NZnO). In this study, the synthesized NZnO powders that were made into T-NZnOP (sample pellets) showed a significantly lower thermal conductivity with distinctive electrical properties when compared to the bulk commercial ZnO powders. The thermoelectric enhancement can be attributed to the nanopore distribution found in the porous T-NZnOP material which demonstrates the potential usefulness of this method for other porous oxide thermoelectric (TE) materials.

Graphical abstract: An alternative, faster and simpler method for the formation of hierarchically porous ZnO particles and their thermoelectric performance

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Publication details

The article was received on 05 May 2017, accepted on 07 Jun 2017 and first published on 27 Jun 2017


Article type: Paper
DOI: 10.1039/C7RA05067D
Citation: RSC Adv., 2017,7, 31960-31968
  • Open access: Creative Commons BY-NC license
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    An alternative, faster and simpler method for the formation of hierarchically porous ZnO particles and their thermoelectric performance

    Raymond V. R. Virtudazo, Q. Guo, R. Wu, T. Takei and T. Mori, RSC Adv., 2017, 7, 31960
    DOI: 10.1039/C7RA05067D

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