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Construction of CoNi2S4 nanocubes interlinked by few-layer Ti3C2Tx MXene with high performance for asymmetric supercapacitors
Ist Teil von
Rare metals, 2022-12, Vol.41 (12), p.4116-4126
Ort / Verlag
Beijing: Nonferrous Metals Society of China
Erscheinungsjahr
2022
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Both MXene and zeolitic imidazolate framework (ZIF) derivatives are tend to agglomerate during the compound process, which adversely affects their electrochemical properties. To alleviate this phenomenon, few-layer MXene was stripped by mechanical method, and electrostatic self-assembly with ZIF-67 in the presence of cationic surfactants. Furthermore, CoNi
2
S
4
/MXene composite was synthesized by the facile hydrothermal reaction. CoNi
2
S
4
well retained the cube frame structure of the ZIF-67 with the sagging outer frame and rough surface. In the composite, CoNi
2
S
4
nanocubes were interlinked by MXene nanosheets, which can effectively improve the structural stability and make full use of the active surface. CoNi
2
S
4
/MXene composite electrode exhibits an outperforming specific capacitance (751 C·g
−1
at 1 A·g
−1
), far higher than that of pure CoNi
2
S
4
(600 C·g
−1
at 1 A·g
−1
). An asymmetric supercapacitor (CoNi
2
S
4
/MXene//reduced graphene oxide (RGO)) assembling delivers high energy density of 33.8 Wh·kg
−1
and excellent cycling performance. This study indicates the potential of MXene/ZIF derivatives in the application of supercapacitor.
Graphical abstract