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Large electrocaloric response and energy storage study in environmentally friendly (1-x)K0.5Na0.5NbO3-xLaNbO3 nanocrystalline ceramics

Abstract

The electrocaloric material with negative and positive electrocaloric effect (ECE) is identified to be the high potential candidate for solid-state refrigeration technology due to changing the diploar entropy under varying electric field. We have experimentally observed the large value of negative and positive electrocaloric (EC) response in environmentally friendly (1-x)K0.5Na0.5NbO3-xLaNbO3 ceramics using Maxwell’s relations. The maximum value of negative and positive ECE were found to be -0.88 K and 2.08 K at 50 kV/cm for x = 0.03. Material displays high electrocaloric responsivity ( -1.76 and 4.16×10-7 K.m/V for negative and positive ECE, respectively), COP (4.16) and energy storage capacity ( 0.17 J/cm3) for x = 0.03. The large values of negative and positive ECE, high values of electrocaloric esponsivity, COP and energy storage capacity make this compound a better candidate for electrocaloric refrigeration and high energy storage applications. The Olsen cycle has been discussed to explain the process involved to use this material for electrocaloric refrigeration.

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Publication details

The article was received on 13 Jun 2018, accepted on 09 Sep 2018 and first published on 11 Sep 2018


Article type: Paper
DOI: 10.1039/C8SE00276B
Citation: Sustainable Energy Fuels, 2018, Accepted Manuscript
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    Large electrocaloric response and energy storage study in environmentally friendly (1-x)K0.5Na0.5NbO3-xLaNbO3 nanocrystalline ceramics

    R. Kumar, A. kumar and S. Singh, Sustainable Energy Fuels, 2018, Accepted Manuscript , DOI: 10.1039/C8SE00276B

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