Giant electrocaloric materials energy efficiency in highly ordered lead scandium tantalate

Youri Nouchokgwe (), Pierre Lheritier, Chang-Hyo Hong, Alvar Torelló, Romain Faye, Wook Jo, Christian R. H. Bahl and Emmanuel Defay ()
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Youri Nouchokgwe: Luxembourg Institute of Science and Technology
Pierre Lheritier: Luxembourg Institute of Science and Technology
Chang-Hyo Hong: Ulsan National Institute of Science and Technology
Alvar Torelló: Luxembourg Institute of Science and Technology
Romain Faye: Luxembourg Institute of Science and Technology
Wook Jo: Ulsan National Institute of Science and Technology
Christian R. H. Bahl: Technical University of Denmark
Emmanuel Defay: Luxembourg Institute of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Electrocaloric materials are promising working bodies for caloric-based technologies, suggested as an efficient alternative to the vapor compression systems. However, their materials efficiency defined as the ratio of the exchangeable electrocaloric heat to the work needed to trigger this heat remains unknown. Here, we show by direct measurements of heat and electrical work that a highly ordered bulk lead scandium tantalate can exchange more than a hundred times more electrocaloric heat than the work needed to trigger it. Besides, our material exhibits a maximum adiabatic temperature change of 3.7 K at an electric field of 40 kV cm−1. These features are strong assets in favor of electrocaloric materials for future cooling devices.

Date: 2021
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DOI: 10.1038/s41467-021-23354-y

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