Year: 2015
Type: article
Abstract: Transport of active species through the ion-exchange membrane separating the electrodes in a redox-flow battery is an important source of inefficiency. Migration and electro-osmosis have significant impacts on the crossover of reactive anions, cations, and neutral species. In this paper, these phenomena are theoretically and experimentally explored for commercial cation-exchange membranes. The theoretical analysis indicates that plotting the cumulative Coulombic mismatch between charge and discharge as a function of time can be used to assess crossover rates. The relative importance of migration and electro-osmosis over diffusion is quantified and shown to increase with increasing current density and membrane thickness because the contributions of migration and electro-osmosis to ionic flux are independent of membrane thickness and proportional to current density, while diffusion is inversely proportional to membrane thickness and independent of current density.
DOI: 10.1149/2.0031601jes
Institution: Lawrence Berkeley National Laboratory
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $1,950
Awards: G1079818582, G1143651532, G1286236842, G1286251239, G1580346299, G2618837358, G30714459, G3083819904, G349715080, G419881185, G42916606, G4501827968, G498139845, G5030567060, TAS::89 0336::TAS RECOVERY UNITED TECHNOLOGIES RESEARCH CENTER (UTRC) IN PARTNERSHIP WITH THE UNIVERSITY OF TEXAS AND SANDIA NATIONAL LABORATORY, G650090426, G6652958823, G7354628648, G969889393
OpenAlex ID: W1530966494