Oxide-Based Thermoelectric Generator for High-Temperature Application Using p-Type Ca3Co4O9 and n-Type In1.95Sn0.05O3 Legs

verfasst von

Michael Bittner, Benjamin Geppert, Nikola Kanas, Sathya Prakash Singh, Kjell Wiik, Armin Feldhoff

Abstract

A thermoelectric generator couples an entropy current with an electrical current in a way, that thermal energy is transformed to electrical energy. Hereby the thermoelectric energy conversion can be described in terms of fluxes of entropy and electric charge at locally different temperature and electric potential. Crucial for the function of a thermoelectric generator is the sign and strength of the coupling between the entropy current and the electrical current in the thermoelectric materials. For high-temperature application, tin-doped indium oxide (In1.95Sn0.05O3) and misfit-layered calcium cobalt oxide (Ca3Co4O9) ceramics were used as n- and p-type legs. The n-type material reaches a power factor of 6.8μW·cm-1·K-2 at 1,073 K and a figure of merit ZT of 0.07. The p-type material reaches 1.23μW·cm-1·K-2 and a figure of merit ZT of 0.21 at 1,073 K. A thermoelectric generator consisting of ten legs was characterized for different invested temperatures. It delivers 4.8 mW maximum power output and a electrical power density of 2.13mW×cm-2 when the hot side is at 1,073 K and a temperature difference of 113 K is applied.

Organisationseinheit(en)

Institut für Physikalische Chemie und Elektrochemie

Externe Organisation(en)

Norwegian University of Science and Technology (NTNU)

Typ

Artikel

Journal

Energy Harvesting and Systems - Materials, Mechanisms, Circuits and Storage (Print)

Band

3

Seiten

213-222

Anzahl der Seiten

10

ISSN

2329-8774

Publikationsdatum

01.08.2016

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Energieanlagenbau und Kraftwerkstechnik, Elektrotechnik und Elektronik, Elektrochemie, Erneuerbare Energien, Nachhaltigkeit und Umwelt

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1515/ehs-2016-0002 (Zugang: Geschlossen)