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Mass‐Production of Mesoporous MnCo 2 O 4 Spinels with Manganese(IV)‐ and Cobalt(II)‐Rich Surfaces for Superior Bifunctional Oxygen Electrocatalysis
Author(s) -
Wang Wenhai,
Kuai Long,
Cao Wei,
Huttula Marko,
Ollikkala Sami,
Ahopelto Taru,
Honkanen AriPekka,
Huotari Simo,
Yu Mengkang,
Geng Baoyou
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201708765
Subject(s) - electrocatalyst , bifunctional , oxygen evolution , cobalt , manganese , mesoporous material , x ray photoelectron spectroscopy , oxygen , electrode , materials science , chemistry , catalysis , inorganic chemistry , clark electrode , xanes , chemical engineering , electrochemistry , metallurgy , spectroscopy , organic chemistry , physics , quantum mechanics , engineering , electrolyte
A mesoporous MnCo 2 O 4 electrode material is made for bifunctional oxygen electrocatalysis. The MnCo 2 O 4 exhibits both Co 3 O 4 ‐like activity for oxygen evolution reaction (OER) and Mn 2 O 3 ‐like performance for oxygen reduction reaction (ORR). The potential difference between the ORR and OER of MnCo 2 O 4 is as low as 0.83 V. By XANES and XPS investigation, the notable activity results from the preferred Mn IV ‐ and Co II ‐rich surface. The electrode material can be obtained on large‐scale with the precise chemical control of the components at relatively low temperature. The surface state engineering may open a new avenue to optimize the electrocatalysis performance of electrode materials. The prominent bifunctional activity shows that MnCo 2 O 4 could be used in metal–air batteries and/or other energy devices.