Journal
NANOSCALE
Volume 11, Issue 5, Pages 2492-2500Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr09454c
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Funding
- National Natural Science Foundation of China [61704076]
- Natural Science Foundation of Jiangsu Province [BK20171018]
- NanjingTech Start-Up Grant [3983500150]
- Jiangsu Specially-Appointed Professor program [54935012]
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Heteroatom-doped carbon nanostructures with uniform size and morphology, well-designed architectures, and minimized interfacial resistance have been recognized as promising electrode materials for energy storage, but remain a crucial challenge. Herein, we develop a general approach of polarity-induced decoration of a monolayer sheath of metal-organic framework (MOF) particles with excellent uniformity in size and morphology on electrospun polymer nanofibers. These hybrid nanofibers are facilely converted into nitrogen-doped nanofibrous carbon (denoted as N-NFC) during pyrolysis. The thus-obtained N-NFC features (1) a one-dimensional nanofibrous structure with a highly conductive core, (2) a monolayer sheath of hollow carbon-frames with uniform size and morphology, (3) plenty of micro/mesopores with a highly accessible surface area, and (4) a high N-doping level, all of which guarantee its good electrochemical performance with a high capacitance of 387.3 F g(-1) at 1 A g(-1). In a solid-state supercapacitor, it delivers excellent rate capability (78.0 F g(-1) at 0.2 A g(-1) and 64.0 F g(-1) at 1 A g(-1)), an enhanced energy density of 7.9 W h kg(-1) at a power density of 219 W kg(-1), and outstanding cycling stability with 90% capacity retained over 10000 cycles at 1 A g(-1).
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