Fig. 6: Operando imaging of the active species transport in the ICON beamline with the neutron attenuating BF4− supporting ion.
From: Quantifying concentration distributions in redox flow batteries with neutron radiography
a Schematic representation of the non-aqueous cell designs during charge and discharge mode, where the counter electrode (CE) corresponds to 0.5 M TEMPO and the working electrode (WE) to 0.5 M TEMPO+BF4−. b Electrochemical sequence over time showing the applied potential steps and measured averaged current output at two inlet flow rates of 21.1 mL min-1 and 6.7 mL min-1. c Deconvoluted active species (TEMPO/TEMPO+) and BF4− supporting ion concentration profiles. The averaged snapshots of the cell after image processing and the concentration profiles over time are shown for various applied potential steps and flow rates: OCV, −0.6 V and +0.6 V at 21.1 mL min-1 and −0.6 V, +0.6 V, −0.3 V and +0.3 V at 6.7 mL min-1, from left to right, where the OCV images are averaged over 5 images and the applied potentials averaged over 4 images.
