Novel dealloying-fabricated NiCo2S4 nanoparticles with excellent cycling performance for supercapacitors.
Nanotechnology
; 30(23): 235402, 2019 Jun 07.
Article
em En
| MEDLINE
| ID: mdl-30743256
ABSTRACT
In this work, NiCo2S4 nanoparticles for supercapacitors are successfully synthesized with a top-down strategy, using a novel dealloying method with an ion exchange reaction. The surface morphology and x-ray diffraction investigations demonstrated that NiCo2S4 nanoparticles are interconnected by ligaments of the synthesized sample. The dealloyed NiCo2S4 shows an enhanced electrochemical performance of about 1132.5 F g-1 at 0.5 A g-1; kinetic analysis implies a surface-controlled contribution from NiCo2S4 (53.86% capacitive contributions). Notably, the NiCo2S4//AC (active carbon) device displays a comparatively high energy density (22.83 Wh kg-1), maximum power density (1327.1 W kg-1) and superior cycling performance (capacitance retention of 108% after 30 000 cycles).
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MEDLINE
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En
Ano de publicação:
2019
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Article