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Composition-driven inverse-to-conventional transformation of electrocaloric effect and large energy storage density in strontium modified Ba(Zr0.1Ti0.9)O3 thin films

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Abstract

In this work, (Ba1−xSrx)Zr0.1Ti0.9O3 (BSZTx, x = 0, 0.15, 0.25 and 0.35) thin films were successfully deposited on La0.7Sr0.3MnO3 (LSMO)-coated (001) SrTiO3 (STO) single crystal substrates using laser molecular beam epitaxy. The BSZTx thin films with compositions of x = 0 and 0.15 display an inverse electrocaloric effect (ECE) with a maximum adiabatic temperature change of ΔT ∼ −10 K under 1500 kV cm−1, while a large positive ΔT amounting to ∼13 K is discovered in the strontium rich composition, i.e. x = 0.35. For the composition of x = 0.25 where weak ECE (|ΔT| < 2 K) is discovered, an energy storage density of 15.5 J cm−3 with an efficiency of 69.8% is observed in the temperature range of 303–413 K. The composition-tunable electrocaloric effect and large energy storage density with excellent thermal stability in strontium modified Ba(Zr0.1Ti0.9)O3 thin films are ascribed to the synergistic effects of different dynamics of polar nano-regions (PNRs) and conformed defect dipoles Image ID:c9tc06515f-t1.gif under large electric fields at elevated temperatures. This work will facilitate the development of novel solid-state cooling devices and provide a design route for high energy storage density devices.

Graphical abstract: Composition-driven inverse-to-conventional transformation of electrocaloric effect and large energy storage density in strontium modified Ba(Zr0.1Ti0.9)O3 thin films

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Article information


Submitted
28 Nov 2019
Accepted
11 Dec 2019
First published
12 Dec 2019

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Composition-driven inverse-to-conventional transformation of electrocaloric effect and large energy storage density in strontium modified Ba(Zr0.1Ti0.9)O3 thin films

Y. Sun, L. Zhang, H. Wang, M. Guo, X. Lou and D. Wang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC06515F

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