Covalency-reinforced oxygen evolution reaction catalyst.
The oxygen evolution reaction that occurs during water oxidation is of considerable importance as an essential energy conversion reaction for rechargeable metal-air batteries and direct solar water splitting. Cost-efficient ABO3 perovskites have been studied extensively because of their high activity for the oxygen evolution reaction; however, they lack stability, and an effective solution to this problem has not yet been demonstrated. Here we report that the Fe(4+)-based quadruple perovskite CaCu3Fe4O12 has high activity, which is comparable to or exceeding those of state-of-the-art catalysts such as Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-δ) and the gold standard RuO2. The covalent bonding network incorporating multiple Cu(2+) and Fe(4+) transition metal ions significantly enhances the structural stability of CaCu3Fe4O12, which is key to achieving highly active long-life catalysts.
Nanoscience and Nanotechnology Research Centre, Osaka Prefecture University, Osaka 599-8570, Japan.
Shunsuke
S
Yagi
Nanoscience and Nanotechnology Research Centre, Osaka Prefecture University, Osaka 599-8570, Japan.|Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Tokyo 102-0075, Japan.
Ikuya
I
Yamada
Department of Materials Science and Engineering, Osaka Prefecture University, Osaka 599-8531, Japan.
Hirofumi
H
Tsukasaki
Nanoscience and Nanotechnology Research Centre, Osaka Prefecture University, Osaka 599-8570, Japan.
Akihiro
A
Seno
Department of Materials Science and Engineering, Osaka Prefecture University, Osaka 599-8531, Japan.
Makoto
M
Murakami
Department of Materials Science and Engineering, Osaka Prefecture University, Osaka 599-8531, Japan.
Hiroshi
H
Fujii
National Institute for Materials Science, Tsukuba 305-0044, Japan.
Hungru
H
Chen
Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Tokyo 102-0075, Japan.|National Institute for Materials Science, Tsukuba 305-0044, Japan.
Naoto
N
Umezawa
Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Tokyo 102-0075, Japan.|National Institute for Materials Science, Tsukuba 305-0044, Japan.
Hideki
H
Abe
Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Tokyo 102-0075, Japan.|Deutsches Elektronen Synchrotron, Hamburg 22607, Germany.
Norimasa
N
Nishiyama
Department of Materials Science and Engineering, Osaka Prefecture University, Osaka 599-8531, Japan.
Shigeo
S
Mori