Mass-production of mesoporous MnCo₂O₄ spinels with manganese(IV)- and cobalt(II)-rich surfaces for superior bifunctional oxygen electrocatalysis
Wang, Wenhai; Kuai, Long; Cao, Wei; Huttula, Marko; Ollikkala, Sami; Ahopelto, Taru; Honkanen, Ari‐Pekka; Huotari, Simo; Yu, Mengkang; Geng, Baoyou (2017-11-15)
W. Wang, L. Kuai, W. Cao, M. Huttula, S. Ollikkala, T. Ahopelto, A.-P. Honkanen, S. Huotari, M. Yu, B. Geng, Angew. Chem. Int. Ed. 2017, 56, 14977.
This is the peer reviewed version of the following article: W. Wang, L. Kuai, W. Cao, M. Huttula, S. Ollikkala, T. Ahopelto, A.-P. Honkanen, S. Huotari, M. Yu, B. Geng, Angew. Chem. Int. Ed. 2017, 56, 14977., which has been published in final form at https://doi.org/10.1002/anie.201708765 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
A mesoporous MnCo₂O₄ electrode material is made for bifunctional oxygen electrocatalysis. The MnCo₂O₄ exhibits both Co₃O₄-like activity for oxygen evolution reaction (OER) and Mn₂O₃-like performance for oxygen reduction reaction (ORR). The potential difference between the ORR and OER of MnCo₂O₄ is as low as 0.83 V. By XANES and XPS investigation, the notable activity results from the preferred MnIV- and CoII-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 MnCo₂O₄ could be used in metal–air batteries and/or other energy devices.
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