Vats, Gaurav and Kumar, Ashok and Ortega, Nora and Bowen, Chris R. and Katiyar, Ram S. (2016) Giant pyroelectric energy harvesting and a negative electrocaloric effect in multilayered nanostructures. Energy and Environmental Science , 9 (4). pp. 1335-1345. ISSN 1754-5692

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Abstract

This work examines the potential of PbZr0.53Ti0.47O3/CoFe2O4 (PZT/CFO) multi-layered nanostructures (MLNs) to achieve a giant electrocaloric effect (ECE) and enhanced pyroelectric energy harvesting. Unlike the conventional ECE, the effect of PZT/CFO MLNs is governed by dynamic magneto-electric coupling (MEC) and can be tuned by the arrangement of various ferroic layers. The ECE is investigated in the stacks of three (L3), five (L5) and nine (L9) alternating PZT and CFO layers. Intriguingly, all configurations exhibit a negative ECE, calculated using Maxwell relations, which has a high magnitude in comparison with the previously reported giant negative ECE (vertical bar Delta T vertical bar = 6.2 K). The maximum ECE temperature change calculated in three (L3), five (L5) and nine (L9) layers is 52.3 K, 32.4 K and 25.0 K respectively. In addition, the maximum pyroelectric energy harvesting calculated for these layers using a modified Olsen cycle is nearly four times higher than the highest reported pyroelectric energy density of 11 549 kJ m(-3) cycle(-1). This increase is attributed to the cumulative effect of multiple layers that induce an enhancement in the overall polarization, 1.5 times of lead zirconate titanate, and leads to abrupt polarization changes with temperature fluctuations. The present study also sheds light on material selection and the thermodynamic processes involved in the ECE and it is concluded that the refrigeration obtained from the reversed Olsen cycle is a combined effect of an isothermal entropy as well as the adiabatic temperature change.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Royal Society of Chemistry.
Subjects:	Chemistry Energy Fuels
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	20 Nov 2017 11:22
Last Modified:	20 Nov 2017 11:22
URI:	http://npl.csircentral.net/id/eprint/2232

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