Evaluation of Developmental Membranes for the Mixed Reactant Iron-Chromium Redox System

摘要

The advent of operating the NASA Redox Storage at 65 sup 0 C with premixed iron-chromium reactant solutions has changed membrane requirements. These new conditions allow the use of low resistivity membranes having relatively poor selectivity compared to membranes developed for system operation with separate reactants at 25 sup 0 C. This paper presents the results of in-cell evaluations of developmental membranes for the new conditions. Data reported include diffusion rate, area resistivity, and coulombic and energy efficiencies over a wide range of current densities. Use of these membranes has resulted in peak round trip energy efficiencies greater than 80% at current densities as high as 80 mA/cm sup 2 . (ERA citation 12:026884)