Brownmillerite‐type Ca2FeCoO5 as a Practicable Oxygen Evolution Reaction Catalyst

• DOI: 10.1002/cssc.201700499
• Publication Date: 2017-05-25T17:11:55Z
• Authors: Etsushi Tsuji; Teruki Motohashi; Hiroyuki Noda; Damian Kowalski; Yoshitaka Aoki; Hajime Tanida; Junji Niikura; Yukinori Koyama; Masahiro Mori; Hajime Arai; Tsutomu Ioroi; Naoko Fujiwara; Yoshiharu Uchimoto; Zempachi Ogumi; Hiroki Habazaki
• Keywords: Models, Molecular; brownmillerite; perovskites; Molecular Conformation; Oxides; Cobalt; 02 engineering and technology; electrocatalysts; 431; 7. Clean energy; 01 natural sciences; transition metals; Catalysis; Oxygen; oxygen evolution reaction; 0103 physical sciences; 0210 nano-technology; Iron Compounds

AbstractHere, we report remarkable oxygen evolution reaction (OER) catalytic activity of brownmillerite (BM)‐type Ca2FeCoO5. The OER activity of this oxide is comparable to or beyond those of the state‐of‐the‐art perovskite (PV)‐catalyst Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) and a precious‐metal catalyst RuO2, emphasizing the importance of the characteristic BM structure with multiple coordination environments of transition metal (TM) species. Also, Ca2FeCoO5 is clearly advantageous in terms of expense/laboriousness of the material synthesis. These facts make this oxide a promising OER catalyst used in many energy conversion technologies such as metal–air secondary batteries and hydrogen production from electrochemical/photocatalytic water splitting.