Matching the impedance of ionic polymer metal composites for energy harvesting
- Matching the impedance of ionic polymer metal composites for energy harvesting
- 차영수; Hubert Kim; Maurizio Porfiri
- energy harvesting; impedance matching; ionic polymer metal composites; synthetic inductor; Warburg impedance
- Issue Date
- Smart materials & structures
- VOL 23, NO 12, 127002
- 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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