Open AccessFull Cell Study of Diels Alder Poly(phenylene) Anion and Cation Exchange Membranes in Vanadium Redox Flow Batteries
Author(s) -
Alan Pezeshki,
Zhijiang Tang,
Cy Fujimoto,
CheNan Sun,
Matthew M. Mench,
Thomas A. Zawodzinski
Publication year - 2015
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/2.0201601jes
Subject(s) - membrane , vanadium , flow battery , phenylene , nafion , redox , chemistry , ion exchange , permeation , polymer chemistry , inorganic chemistry , polymer , chemical engineering , materials science , ion , electrochemistry , organic chemistry , electrode , biochemistry , engineering , electrolyte
In this paper, we report on the performance of Diels Alder poly(phenylene) membranes in vanadium redox flow batteries. The membranes were functionalized with quaternary ammonium groups to form an anion exchange membrane (QDAPP) and with sulfonic acid groups to form a cation exchange membrane (SDAPP). Both membrane classes showed similar conductivities in the battery environment, suggesting that the ion conduction mechanism in the material is not strongly affected by the moieties along the polymer backbone. The resistance to vanadium permeation in QDAPP was not improved relative to SDAPP, further suggesting that the polarity of the functional groups do not play a significant role in the membrane materials tested. Both QDAPP and SDAPP outperformed Nafion membranes in cycling tests, with both achieving voltage efficiencies above 85% while maintaining 95% coulombic efficiency while at a current density of 200 mA/cm2.
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