Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 910, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.164845
Keywords
Core-shell structure; Metal-organic framework; Porous carbon; Nitrogen-doping; Potassium-ion batteries
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Funding
- Zhongshan Science and Technology Planning Project of Guangdong Province, China [2019A4008]
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A general method was introduced for preparing nano composites from metal-organic frameworks coated with ammonium ferric citrate, resulting in Fe3C@MOF-C/N composite material with high structural stability and electrical conductivity. As a PIB anode, Fe3C@MOF-C/N-1 exhibited high capacity and cycling performance, showing potential application in potassium ion batteries.
Transition metal carbide is being used as an emerging high-capacity anode material for the next-generation potassium ion batteries (PIBs). Herein, a general method was introduced for the preparation of nano composites from metal-organic frameworks (MOFs) coated with ammonium ferric citrate. A novel composite material of Fe3C nanoparticles was designed and prepared by pyrolysis of MOF, and embedded in graphitic carbon as a PIB anode (Fe3C@MOF-C/N). The Fe3C particles were encapsulated in an N-doped carbon shell with a hierarchical porous carbon network. N-doped porous carbon exhibited a large specific surface area and abundant carbon edge defects, which led to the increase in the number of exposed active sites, facilitating the adsorption of potassium ions. As a result, the prepared carbon material shows high structural stability, electrical conductivity, and proton conductivity. As a PIB anode, Fe3C@MOF-C/N-1 shows a high capacity of 294 mAh g-1 over 1000 cycles at 200 mA g(-1) , revealing its potential application as carbon material in PIB anodes. (C) 2022 Elsevier B.V. All rights reserved.
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