Segmented Thermoelectric Oxide-Based Module for High-Temperature Waste Heat Harvesting

Thanh Hung Le, Ngo Van Nong, Li Han, Rasmus Bjørk, Hoang Ngan Pham, Tim Holgate, Benjamin Balke, Gerald Jeffrey Snyder, Søren Linderoth, Nini Pryds

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We report a high-performance thermoelectric (TE) oxide-based module using the segmentation of half-Heusler Ti0.3Zr0.35Hf0.35CoSb0.8Sn0.2 and misfit-layered cobaltite Ca3Co4O9+δ as the p-leg and 2% Al-doped ZnO as the n-leg. The maximum output power of a 4-couple segmented module at ΔT=700 K attains a value of approximately 6.5 kWm-2, which is three times higher than that of the best reported non-segmented oxide module. The TE properties of individual legs, as well as the interfacial contact resistances, were characterized as a function of temperature. Numerical modeling was used to predict the efficiency and to evaluate the influence of the electrical and thermal losses on the performance of TE modules. Initial long-term stability tests of the module at the hot and the cold side temperatures of 1073 K and 444 K, respectively, showed a promising result with 4% degradation for 48 h operating in air.
Original languageEnglish
JournalEnergy Technology
Volume3
Issue number11
Pages (from-to)1143–1151
Number of pages10
ISSN2194-4288
DOIs
Publication statusPublished - 2015

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