Large seebeck coefficients of protonated titanate nanotubes for high-temperature thermoelectric conversion

L. Miao, S. Tanemura, R. Huang, C. Y. Liu, C. M. Huang, G. Xu

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Titanate nanotubes Na2-xHxTi3O7 produced by alkali hydrothermally treated ground TiO2 aerogels are investigated as possible materials for high-temperature thermoelectric conversion by measuring their thermoelectric properties. Strikingly, the Seebeck coefficients increased sharply in the temperature range 745 to 1032 K, reaching a maximum of 302 μV/K. The electrical resistivity of the TNNTs ranged from 325 to 525 Ωm, which is lower than that of bulk TiO2, and thermal conductivities at room temperature were also very low, ranging from 0.55 to 0.75 Wm-1 K-1. The hollow structure of the titanate nanotubes, with small, uniform diameters, is thought to be responsible for the ultralow thermal conductivity. The large thermoelectric power and ultralow thermal conductivity suggest that titanate nanotubes represent a new kind of p-type oxide thermoelectric material.

Original languageEnglish
Pages (from-to)2355-2359
Number of pages5
JournalACS Applied Materials and Interfaces
Volume2
Issue number8
DOIs
Publication statusPublished - 2010 Aug 25

Keywords

  • Seebeck coefficients
  • oxide nanomaterials
  • thermoelectric conversion
  • titanate nanotubes

ASJC Scopus subject areas

  • Materials Science(all)

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