期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 39, 页码 21272-21278出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm34840c
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资金
- NSERC Canada
- Ontario Graduate Scholarships
Polymer electrolytes comprised of silicotungstic acid (SiWA) in cross-linked polyvinyl alcohol have been developed and characterized for ultra-high rate electrochemical capacitors (ECs). The solid polymer electrolytes outperformed liquid H2SO4 electrolytes in a similar cell setup. The polymer electrolyte enabled thin flexible solid double layer ECs demonstrated an exceptionally high rate capability of 50 V s(-1) in cyclic voltammograms and a 10 ms time constant in impedance analyses. Enhanced stability and water uptake were observed for the cross-linked polymer electrolytes compared to their non-cross-linked counterparts. Thermal analysis revealed an increase of water content with the percentage of cross-linking. Structural analyses suggested that SiWA in the cross-linked polymer electrolyte was more hydrated than SiWA in the non-cross-linked polymer electrolyte. In addition, a stronger hydrogen bonding interaction was observed due to an increase in the crystallized water content in hydrated SiWA suggesting a more stable proton-hopping network that can be leveraged for high conductivity.
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