Journal
MATERIALS TODAY ENERGY
Volume 18, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2020.100565
Keywords
Zn-air battery; Bifunctional electrocatalysis; Oxygen reduction reaction; Oxygen evolution reaction; Co6Mo6C2
Funding
- National Natural Science Foundation of China [51972293, 51772039, 21902189, 21901264]
- Key Scientific Research Projects of Universities in Henan Province [21A150062]
- Young Backbone Teacher of Zhongyuan University of Technology
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Designing composite material that contains high-active oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) species is an effective strategy for synthesizing bifunctional electrocatalysts for Zn-air batteries. In this work, we first reported the preparation of the Co6Mo6C2-Co@NC nanorod composite by using the Mo-polydopamine@ZIF-67 composite as the precursor. Because of the highly active Co6Mo6C2 for OER and the high-active Co for ORR, the Co6Mo6C2-Co@NC exhibits superior OER activity, with a low overpotential of 268 mV at 10 mA cm(-2), and high ORR performance. When used as bifunctional electrocatalysts for the Zn-air battery, the battery exhibits a high open-circuit voltage of 1.38 V and a specific capacity of 760 mA/h/g, as well as very high stability of up to 300 h with no obvious increase in charge-discharge voltage gap. (C) 2020 Elsevier Ltd. All rights reserved.
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