ChemSusChem
ChemSusChem
5 years ago

Brownmillerite-type Ca2FeCoO5 as a Practicable Oxygen Evolution Reaction Catalyst

Brownmillerite-type Ca2FeCoO5 as a Practicable Oxygen Evolution Reaction Catalyst
Yoshiharu Uchimoto, Masahiro Mori, Hiroyuki Noda, Tsutomu Ioroi, Hajime Arai, Hajime Tanida, Hiroki Habazaki, Zempachi Ogumi, Yukinori Koyama, Yoshitaka Aoki, Teruki Motohashi, Etsushi Tsuji, Naoko Fujiwara, Junji Niikura, Damian Kowalski
Here, 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. A winning combo: We report remarkable oxygen evolution reaction (OER) catalytic activity of brownmillerite (BM)-type Ca2FeCoO5 in alkaline media. The combination of tetrahedral and octahedral sites in the BM structure plays a crucial role in the observed OER activity, which is comparable to or beyond those of the state-of-the-art perovskite catalysts and a precious-metal catalyst RuO2.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cssc.201700499

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