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Zhibin Yi1 Liangjun Zhou1 Zhouguang Lu1

1, Southern University of Science and Technology, Shenzhen, , China

It is still a great challenge to prepare efficient, cost-effective and stable electrocatalyst for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) for many energy technologies, like water splitting, fuel cell and metal-air batteries1. The earth-abundant first-row transition-metal-based catalysts have been developed for Oxygen revolution reaction. And among numerous low-costed oxides investigated, cobalt oxides are promising for both OER and ORR1-2. Herein, we introduced a simple strategy to synthesis the N-doped mesoporous nanofibers with an optimal non-noble metal dispersion by electrospinning. The mesoporous structure can help to increase the reaction area for catalytic reaction, while the metal elements can help tune the catalytic activity of these material. Up to now, the best multimetal combination we demonstrated is Fe:Co:Mo (with a particular ratio ), which shows a relative long life, a positive potential of 0.94V and a half-wave potential of 0.804V under the alkaline media, close to that of commercial Pt/C.

Acknowledgement
This work was financially supported by the National Natural Science Foundation of China (No. 21671096), the Shenzhen Key Laboratory Project (No. ZDSYS201603311013489), the Natural Science Foundation of Shenzhen (No. JCYJ20170412153139454, JCYJ20150331101823677), and the Innovative Entrepreneurship Training Program of Southern University of Science and Technology (2016S14, 2017X07).

References
1. Maiyalagan, T.; Jarvis, K. A.; Therese, S.; Ferreira, P. J.; Manthiram, A., Spinel-type lithium cobalt oxide as a bifunctional electrocatalyst for the oxygen evolution and oxygen reduction reactions. Nature Communications 2014, 5.
2. Zhang, B.; Zheng, X.; Voznyy, O.; Comin, R.; Bajdich, M.; García-Melchor, M.; Han, L.; Xu, J.; Liu, M.; Zheng, L.; García de Arquer, F. P.; Dinh, C. T.; Fan, F.; Yuan, M.; Yassitepe, E.; Chen, N.; Regier, T.; Liu, P.; Li, Y.; De Luna, P.; Janmohamed, A.; Xin, H. L.; Yang, H.; Vojvodic, A.; Sargent, E. H., Homogeneously dispersed multimetal oxygen-evolving catalysts. Science 2016, 352 (6283), 333-337.

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