Hollow NiSe/CoSe/Co(OH) hexagonal plates for high-performance hybrid supercapacitors
In order to improve the electrochemical performance, the combination of different battery-like electrode materials has attracted tremendous attention. Herein, a synthetic strategy has been proposed by combining Ni 0.85 Se, Co 0.85 Se and Co(OH) 2 materials. With nickel-cobalt hydroxide as the precur...
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Veröffentlicht in: | Sustainable energy & fuels 2020-11, Vol.4 (12), p.6174-618 |
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Zusammenfassung: | In order to improve the electrochemical performance, the combination of different battery-like electrode materials has attracted tremendous attention. Herein, a synthetic strategy has been proposed by combining Ni
0.85
Se, Co
0.85
Se and Co(OH)
2
materials. With nickel-cobalt hydroxide as the precursor, hollow Ni
0.85
Se/Co
0.85
Se/Co(OH)
2
hexagonal plates were successfully synthesized. When investigated as electrode materials for supercapacitors, outstanding electrochemical performance of the Ni
0.85
Se/Co
0.85
Se/Co(OH)
2
electrode is achieved by taking advantage of the high specific capacitance of Ni
0.85
Se and Co
0.85
Se, preferable cycling stability of Co(OH)
2
and special hollow architecture. The Ni
0.85
Se/Co
0.85
Se/Co(OH)
2
electrode demonstrates a high specific capacitance of 842.7 F g
−1
after 2000 cycles at the current density of 2 A g
−1
and the Ni
0.85
Se/Co
0.85
Se/Co(OH)
2
//AC hybrid supercapacitor device shows a remarkable specific energy of 48.9 W h kg
−1
at a specific power of 569.4 W kg
−1
.
Hollow Ni
0.85
Se/Co
0.85
Se/Co(OH)
2
hexagonal plates were prepared by controlling the selenylation reaction rate between Ni-Co hydroxide and Se, and the composite showed outstanding cycling stability and satisfactory specific energy and specific power. |
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ISSN: | 2398-4902 |
DOI: | 10.1039/d0se00097c |