Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
4 years ago

Mass-production of Mesoporous MnCo2O4 Spinel with MnIV- and CoII-rich Surface for Superior Bifunctional Oxygen Electrocatalysis

Wenhai Wang, Long Kuai, Taru Ahopelto, Sami Ollikkala, Marko Huttula, Baoyou Geng, Simo Huotari, Mengkang Yu, Wei Cao, Ari-Pekka Honkanen
A mesoporous MnCo2O4 electrode materials is successfully fabricated for bifunctional oxygen electrocatalysis. The MnCo2O4 exhibits both Co3O4-like activity for oxygen evolution reaction (OER) and Mn2O3-approaching performance for oxygen reduction reaction (ORR). The potential difference between ORR metric and OER metric of MnCo2O4 is as low as 0.84 V. By XANES and XPS investigation, the notable activity is resulted from the preferred MnIV- and CoII-rich surface. Valuably, the products can be obtained in large-scale with the precise chemical components at relatively low temperature. The surface state engineering maybe open a new avenue to optimize electrocatalysis performance of electrode materials. The prominent bifunctional activity shows that MnCo2O4 has the possibility of being used in metal-air batteries and/or other energy devices.

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

DOI: 10.1002/anie.201708765

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