Hierarchical microstructure constructed with graphitic carbon-coated Ni3S2 nanoparticles anchored on N-doped mesoporous carbon nanoflakes for optimized sodium storage.
Nanoscale
; 13(44): 18734-18740, 2021 Nov 18.
Article
in En
| MEDLINE
| ID: mdl-34739537
ABSTRACT
A hierarchical microstructure constructed with graphitic-carbon-coated Ni3S2 nanoparticles anchored on N-doped mesoporous carbon nanoflakes was fabricated using a nickel-based micro-nano structure as a precursor and polydopamine as a carbon source. By optimizing the microstructure, the obtained Ni3S2/carbon composite compounded with the thickest carbon nanoflakes delivers ultrafast and stable Na-ion storage performance, and can maintain a reversible charge capacity of 372 mA h g-1 at a current density of 5 A g-1 over 250 cycles, and 316 mA h g-1 even at a current density of 20 A g-1 for 2000 cycles. These remarkable electrochemical properties can be attributed to its hierarchical microstructure of graphitic-carbon-coated Ni3S2 particles and N-doped mesoporous carbon nanoflakes, which provide easy accessibility to the electrolyte, fast electron transport and Na+ diffusion, and even relieve the strain caused by the volume expansion upon cycling.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Nanoscale
Year:
2021
Document type:
Article
Publication country:
ENGLAND
/
ESCOCIA
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GB
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GREAT BRITAIN
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INGLATERRA
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REINO UNIDO
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SCOTLAND
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UK
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UNITED KINGDOM