<i>Operando</i> Fe dissolution in Fe–N–C electrocatalysts during acidic oxygen reduction: impact of local pH change
Angus Pedersen, Kavita Kumar, Yu-Ping Ku, Vincent Martin, Laëtitia Dubau, Keyla Teixeira Santos, Jesús Barrio, Viktoriia A. Saveleva, Pieter Glatzel, Vinod K. Paidi, Xiaoyan Li, Andreas Hutzler, Maria‐Magdalena Titirici, Antoine Bonnefont, Serhiy Cherevko, Ifan E. L. Stephens, Frédéric Maillard
Abstract
consumption and therefore pH increase (pH = 8-9) within the bulk Fe-N-C layer facilitate precipitation of Fe cations. This work provides a unified view on the Fe dissolution degradation mechanism for a model Fe-N-C in both high-throughput flow cell and practical operating GDE conditions, underscoring the crucial role of local pH in regulating the stability of the active sites.
Topics & Concepts
DissolutionOxygen reductionChemistryOxygen reduction reactionOxygenInorganic chemistryReduction (mathematics)ElectrochemistryElectrodePhysical chemistryOrganic chemistryMathematicsGeometryElectrocatalysts for Energy ConversionElectrochemical Analysis and ApplicationsAdvanced battery technologies research