4.8 Article

Phase Engineering of Molybdenum Carbide-Cobalt Heterostructures for Long-Lasting Zn-Air Batteries

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 15, Issue 35, Pages 41476-41482

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.3c06711

Keywords

molybdenum carbides; heterostructures; crystallinephase; oxygen reduction reaction; Zn-air battery

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Developing highly active and stable oxygen catalysts is crucial for the commercialization of Znair batteries. In this study, heterostructured catalysts with controlled crystalline phases of molybdenum carbide were prepared, and the electronic configurations of cobalt and molybdenum centers were adjusted. The resulting catalysts exhibited excellent performance in Znair batteries.
Developing highly active and robust oxygen catalysts is of great significance for the commercialization of Znair batteries (ZABs) with long-life stability. Herein, heterostructured catalysts comprising molybdenum carbide and metallic Co are prepared by a simple dicyandiamide-assisted pyrolysis strategy. Importantly, the crystalline phase of molybdenum carbide in the catalysts can be carefully regulated by adjusting the CoMoimidazole precursor and dicyandiamide ratio. The electronic configuration of Co and Mo centers as well as the phasedependent oxygen reduction reaction performance of these heterostructures (ss- Mo2C/Co, ss-Mo2C/.- MoC/Co, and.MoC/Co) was disclosed. A highly active.-MoC/Co cathode enables ZABs with outstanding long-term stability over 850 h with a low voltage decaying rate of 0.06 mV center dot h(-1) and high peak power density of 162 mW center dot cm(-2). This work provides a new idea for the rational design of efficient and stable cathode catalysts for ZABs.

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