Maximizing the Energy Density of Dielectric Elastomer Generators Using Equi-Biaxial Loading

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Maximizing the Energy Density of Dielectric Elastomer Generators Using Equi-Biaxial Loading

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Title: Maximizing the Energy Density of Dielectric Elastomer Generators Using Equi-Biaxial Loading
Author: Clarke, David R.; Huang, Jiangshui; Shian, Samuel; Suo, Zhigang

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Citation: Huang, Jiangshui, Samuel Shian, Zhigang Suo, and David R. Clarke. Forthcoming. Maximizing the energy density of dielectric elastomer generators using equi-biaxial loading. Advanced Functional Materials.
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Abstract: Dielectric elastomer generators (DEGs) for harvesting electrical energy from mechanical work have been demonstrated but the energy densities achieved are still small compared with theoretical predictions. We show that significant improvements in energy density (560 J/kg with a power density of 280 W/kg and an efficiency of 27%) can be achieved using equi-biaxial stretching, a mechanical loading configuration that maximizes the capacitance changes. We demonstrate the capacitance of dielectric elastomers subjected to equi-biaxial stretches is proportional to the fourth power of the stretch. Quantification of the individual energy contributions indicates that attaining higher conversion efficiencies is limited by viscous losses within the acrylic elastomer, suggesting that still higher conversion efficiencies with other elastomers should be attainable with our novel mechanical loading design.
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10476713
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