Development of thermoelectric oxides for renewable energy conversion technologies

A. Weidenkaff, R. Robert, M. Aguirre, L. Bocher, T. Lippert, Stela Canulescu

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Geothermal and solar heat can be directly converted into electricity by using thermoelectric generators. Perovskite-type metal oxides are potential materials to improve the efficiency of these devices. Cobaltates with p-type conductivity and n-type manganates are considered for the development of a ceramic thermoelectric converter. Sintered pellets and thin PLD films with the composition La1-xCaxMO3-δ (x = 0, 0.3, 0.4) (M = Co, Mn) were synthesised and characterised concerning their thermoelectric properties in a broad temperature range. It was found that similar to polycrystalline samples the electrical conductivity of LaCoO3 increases significantly with 40% Ca-substitution due to the formation of Co4+ ions while the thermopower decreases. The thermopower values of the La0.8Ca0.2MnO3-δ films have a negative sign, but become large and positive at temperatures of 1000 K.
Original languageEnglish
JournalRenewable Energy
Volume33
Issue number2
Pages (from-to)342-347
ISSN0960-1481
DOIs
Publication statusPublished - 2008
Externally publishedYes
EventEuropean Materials Research Society 2006 - Acropolis Congress Centre, Nice, France
Duration: 29 May 20062 Jun 2006

Conference

ConferenceEuropean Materials Research Society 2006
LocationAcropolis Congress Centre
Country/TerritoryFrance
CityNice
Period29/05/200602/06/2006

Bibliographical note

Part of special issue: E-MRS 2006 Symposium M: Materials, Devices and Prospects for Sustainable Energy

Keywords

  • Solar energy
  • Thermoelectricity
  • Geothermal energy
  • Perovskites
  • Thin films

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