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Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3‐δ Perovskite Activity towards the Oxygen Reduction Reaction in Alkaline Media
Author(s) -
Fabbri Emiliana,
Mohamed Rhiyaad,
Levecque Pieter,
Conrad Olaf,
Kötz Rüdiger,
Schmidt Thomas J.
Publication year - 2014
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201300157
Subject(s) - perovskite (structure) , oxygen reduction reaction , oxygen , rotating disk electrode , electrode , catalysis , inorganic chemistry , materials science , reduction (mathematics) , chemistry , analytical chemistry (journal) , electrochemistry , cyclic voltammetry , crystallography , organic chemistry , geometry , mathematics
Perovskite catalysts: Cyclic voltammograms in Ar‐ and O 2 ‐saturated KOH reveal that the onset for the oxygen reduction reaction (ORR) occurs at potentials below ∼0.77 V RHE . Rotating ring‐disk electrode measurements and Koutecky–Levich analysis prove that for Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3‐δ , the ORR does not fully proceed via a four‐electron process, leading to the parallel formation of OH − and HO 2 − (see picture).