Thermally Resistive Electrospun Composite Membranes for Low‐Grade Thermal Energy Harvesting

Thermally Resistive Electrospun Composite Membranes for Low‐Grade Thermal Energy Harvesting In this work, thermally insulating composite mats of poly(vinylidene fluoride) (PVDF) and polyacrylonitrile (PAN) blends are used as the separator membranes. The membranes improve the thermal‐to‐electrical energy conversion efficiency of a thermally driven electrochemical cell (i.e., thermocell) up to 95%. The justification of the improved performance is an intricate relationship between the porosity, electrolyte uptake, electrolyte uptake rate of the electrospun fibrous mat, and the actual temperature gradient at the electrode surface. When the porosity is too high (87%) in PAN membranes, the electrolyte uptake and electrolyte uptake rate are significantly high as 950% and 0.53 µL s−1, respectively. In such a case, the convective heat flow within the cell is high and the power density is limited to 32.7 mW m−2. When the porosity is lesser (up to 81%) in PVDF membranes, the electrolyte uptake and uptake rate are relatively low as 434% and 0.13 µL s−1, respectively. In this case, the convective flow shall be low, however, the maximum power density of 63.5 mW m−2 is obtained with PVDF/PAN composites as the aforementioned parameters are optimized. Furthermore, multilayered membrane structures are also investigated for which a bilayered architecture produces highest power density of 102.7 mW m−2. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Macromolecular Materials & Engineering Wiley

Thermally Resistive Electrospun Composite Membranes for Low‐Grade Thermal Energy Harvesting

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Publisher
Wiley
Copyright
© 2018 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
1438-7492
eISSN
1439-2054
D.O.I.
10.1002/mame.201700482
Publisher site
See Article on Publisher Site

Abstract

In this work, thermally insulating composite mats of poly(vinylidene fluoride) (PVDF) and polyacrylonitrile (PAN) blends are used as the separator membranes. The membranes improve the thermal‐to‐electrical energy conversion efficiency of a thermally driven electrochemical cell (i.e., thermocell) up to 95%. The justification of the improved performance is an intricate relationship between the porosity, electrolyte uptake, electrolyte uptake rate of the electrospun fibrous mat, and the actual temperature gradient at the electrode surface. When the porosity is too high (87%) in PAN membranes, the electrolyte uptake and electrolyte uptake rate are significantly high as 950% and 0.53 µL s−1, respectively. In such a case, the convective heat flow within the cell is high and the power density is limited to 32.7 mW m−2. When the porosity is lesser (up to 81%) in PVDF membranes, the electrolyte uptake and uptake rate are relatively low as 434% and 0.13 µL s−1, respectively. In this case, the convective flow shall be low, however, the maximum power density of 63.5 mW m−2 is obtained with PVDF/PAN composites as the aforementioned parameters are optimized. Furthermore, multilayered membrane structures are also investigated for which a bilayered architecture produces highest power density of 102.7 mW m−2.

Journal

Macromolecular Materials & EngineeringWiley

Published: Jan 1, 2018

Keywords: ; ; ;

References

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