Journal
RSC ADVANCES
Volume 4, Issue 41, Pages 21332-21339Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra01014k
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Funding
- NSERC Canada
- Ontario Research Fund
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Aqueous quaternary ammonium hydroxides were investigated as electrolytes for electrochemical capacitors (ECs) in both liquid and polymer-gel forms. Alkaline polymer electrolytes, composed of tetraethylammonium hydroxide (TEAOH) and poly(vinyl alcohol) (PVA) in different ratios, were developed and characterized. An optimized TEAOH-PVA electrolyte was developed and compared to KOH-PVA under controlled and ambient conditions. The stability of the polymer electrolytes and the solid ECs were characterized using cyclic voltammetry and electrochemical impedance spectroscopy. While both polymer electrolyte-based ECs demonstrated high rate capability in pristine condition, the TEAOH-based solid EC device showed a much better shelf life than the KOH-based device. This is likely due to the water retention capability of TEAOH, which promoted the amphorous phase and ion mobility, contributing to higher ionic conductivity and better environmental stability.
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