NDLI: Advanced proton conducting membrane for ultra-high rate solid flexible electrochemical capacitors

Content Provider	Royal Society of Chemistry (RSC)
Author	Gao, Han Lian, Keryn
Copyright Year	2012
Abstract	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.
Starting Page	21272
Ending Page	21278
Page Count	7
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	39
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm34840c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	SiWA Acid Polyvinyl alcohol Electrochemistry Polymer Electrolyte Cyclic voltammetry Electrical impedance Thermal analysis Hydrogen
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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