Journal
SMART MATERIALS AND STRUCTURES
Volume 23, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0964-1726/23/12/127002
Keywords
energy harvesting; impedance matching; ionic polymer metal composites; synthetic inductor; Warburg impedance
Funding
- National Science Foundation [CMMI-0926791]
- Mitsui USA Foundation
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In this note, we investigate the possibility of matching the impedance of ionic polymer metal composites (IPMCs) to enhance energy harvesting from bending deformations. We focus on underwater quasi-static post-buckling of patterned IPMCs for different excitation frequencies. We consider a total of 14 samples with a single or two secondary plating layers to garner statistical evidence in favor of impedance matching, for a wide range of IPMC electrical properties. Impedance matching is compared to the classical use of optimized resistive loads. The shunting impedances are designed on the basis of an experimentally-validated physics-based model of IPMC chemo-electro-mechanical behavior. Our results demonstrate that impedance matching significantly benefits IPMC energy harvesting, with the surface resistance playing a key role on the extent of such improvement. Specifically, we find that samples with highly conductive electrodes tend to display a lower equivalent resistance and thus benefit the most from impedance matching.
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