Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 40, Pages 44639-44647Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11185
Keywords
Zn-air batteries; MXenes; wearable batteries; bifunctional electrocatalyst; NiCo2O4 nanocrystal
Funding
- National Natural Science Foundation of China [21706090]
- Ministry of Education of China [6141A02022516]
- Natural Science Foundation of Guangdong Province [2014A030306010, 2019A1515010761]
- Natural Science Foundation of Guangzhou [201904010049]
- APRC Grant of the City University of Hong Kong [9610421]
- Innovation and Technology Fund [ITS/497/18FP, GHP/021/18SZ]
- National Science Foundation [DMR-1608279]
- ECS grant from the Research Grants Council of Hong Kong [CityU 21301319]
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302007]
- Jinan University [88016105]
- Fundamental Research Foundation for the Central Universities [21617326]
- GuangdongHong Kong-Macao joint laboratory of optoelectronic and magnetic functional materials [2019B121205002]
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Recently, owing to the high energy density and excellent security, wearable Zn-air batteries (ZABs) have been known as one of the most prominent wearable energy storage devices. However, sluggish oxygen reaction kinetics of oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in the air-breathe cathode seriously has limited further practical applications. In this work, we synthesize a NiCo2O4 nanocrystal/MXene hybrid with strong Ni/CoF bonds. The prepared MXene-based hybrid composites show remarkable ORR and OER electrocatalytic activity, which results in the fabricated solid-state ZAB device to achieve an open-circuit voltage of 1.40 V, peak power density of 55.1 mW cm(-2), and energy efficiency of 66.1% at 1.0 mA cm(-2); to the best of our knowledge, this is the record performance among all reported flexible ZABs with MXene-based air cathodes and comparable with some noble metal catalysts. Moreover, even after cutting and suturing, our flexible solid-state ZAB devices are tailorable with high rate of performance.
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