期刊
SMALL
卷 17, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202007239
关键词
bifunctional electrocatalysts; flexible devices; hollow structures; metal– air batteries; metal– organic frameworks
类别
资金
- National Natural Science Foundation of China [51871119, 51901100]
- Jiangsu Provincial Founds for Natural Science Foundation [BK20170793, BK20180015]
- Fundamental Research Funds for the Central Universities [NE2017004]
- China Postdoctoral Science Foundation [2018M640481, 2019T120426]
- Jiangsu Postdoctoral Research Fund [2019K003]
- Foundation of Graduation Innovation Center in NUAA [kfjj20190609]
This study presents a promising strategy for designing highly efficient catalysts for flexible metal-air batteries, utilizing bimetallic nanoparticles encapsulated in N-doped hollow carbon nanocubes. The resulting FeCo-NPs/NC hybrid exhibits superior electrocatalytic performance for oxygen reduction and evolution reactions, outperforming state-of-the-art Pt/C and RuO2 catalysts. The findings offer new pathways for the rational creation of high-efficiency energy conversion and storage equipment.
Since the sluggish kinetic process of oxygen reduction (ORR)/evolution (OER) reactions, the design of highly-efficient, robust, and cost-effective catalysts for flexible metal-air batteries is desired but challenging. Herein, bimetallic nanoparticles encapsulated in the N-doped hollow carbon nanocubes (e.g., FeCo-NPs/NC, FeNi-NPs/NC, and CoNi-NPs/NC) are rationally designed via a general heat-treatment strategy of introducing NH3 pyrolysis of dopamine-coated metal-organic frameworks. Impressively, the resultant FeCo-NPs/NC hybrid exhibits superior bifunctional electrocatalytic performance for ORR/OER, manifesting exceptional discharging performance, outstanding lifespan, and prime flexibility for both Zn/Al-air batteries, superior to those of state-of-the-art Pt/C and RuO2 catalysts. X-ray absorption near edge structure and density functional theory indicate that the strong synergy between FeCo alloy and N-doped carbon frameworks has a distinctive activation effect on bimetallic Fe/Co atoms to synchronously modify the electronic structure and afford abundant dual-active Fe/Co-N-x sites, large surface area, high nitrogen doping level, and conductive carbon frameworks to boost the reversible oxygen electrocatalysis. Such N-doped carbon with bimetallic alloy bonds provides new pathways for the rational creation of high-efficiency energy conversion and storage equipment.
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