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Caractéristiques d’un composite thermoélectrique à base de ciment renforcé par du graphite et du MnO2 pour des applications à basse température.

Characteristics of Graphite and MnO2 Enhanced Cement-Based Thermoelectric Composite for Low-Temperature Applications.

Numéro : 3441

Auteurs : LIU X., QU M., NGUYEN A. P. T.

Résumé

Thermoelectric (TE) cement composite is a new type of TE material. Unlike ordinary cement, TE cement can mutually convert thermal energy to electrical energy due to the addition of carbon fibers, metal oxide nanoparticles, etc. In hot summer or cold winter, the significant temperature difference between indoor and outdoor can be used by TE cement to generate electricity. On the other hand, given power input, the same material can provide cooling/ heating to adjust room temperature. Therefore, TE cement has certain energy-saving potential in the application of building enclosures and energy systems. Its ability to convert different forms of energy and use low-grade energy is conducive to the operation of net-zero buildings. In this study, a novel TE cement composite, MnO2 and graphite enhanced cement, was firstly fabricated. The surface morphology of the composites was analyzed by scanning electron microscopy. The performance indicators of TE materials include the power factor and dimensionless figure of merit ZT, which are calculated by Seebeck coefficient, thermal conductivity, and electrical conductivity. The values of these five TE properties were measured and calculated by a Physical Property Measurement System at different temperatures. Compared with the cement reinforced by graphite alone, it is confirmed that MnO2 nanoparticles have a positive effect on the enhancement of the TE performance for cement composites. The highest ZT of 5wt.% graphite and 10wt.% MnO2 enhanced cement composite prepared by the dry method is about 6.2 × 10-6 at 350 K.

Documents disponibles

Format PDF

Pages : 10

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Characteristics of Graphite and MnO2 Enhanced Cement-Based Thermoelectric Composite for Low-Temperature Applications.
  • Identifiant de la fiche : 30028650
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 2021 Purdue Conferences. 6th International High Performance Buildings Conference at Purdue.
  • Date d'édition : 24/05/2021
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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