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09.09.2019 | Energy materials

Hierarchical NiCo₂O₄/MnO₂ core–shell nanosheets arrays for flexible asymmetric supercapacitor

verfasst von: Jianfang Zhang, Yan Wang, Cuiping Yu, Tianyu Zhu, Yang Li, Jiewu Cui, Jingjie Wu, Xia Shu, Yongqiang Qin, Jian Sun, Jian Yan, Yong Zhang, Yucheng Wu

Erschienen in: Journal of Materials Science | Ausgabe 2/2020

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Abstract

Rational construction of binder-free electrode is regarded as a promising way to improve the electrochemical performance of supercapacitor. Herein, we synthesize a hierarchical NiCo₂O₄/MnO₂ core–shell nanosheets arrays by two-step cathodic electrodeposition method. The optimized NiCo₂O₄/MnO₂ electrode prepared by the electrodeposition potential of − 1.8 V for 240 s shows a large specific capacitance of 3.81 F cm⁻² at 2 mA cm⁻². The enhanced electrochemical performance is attributed to the unique core–shell structure of NiCo₂O₄/MnO₂ nanosheets arrays with appropriate interspaces between nanosheets that can offer more active sites and accelerate ion/electron transfer rate. Besides, the NiCo₂O₄/MnO₂//AC flexible asymmetric supercapacitor achieves a high energy density of 2.55 mWh cm⁻³ with good stability (86.1% of initial capacitance can remain after 10000 cycles), indicating the perfect energy storage features.

Vorheriger Artikel Fabrication of multi-crystalline silicon pyramid structure and improvement in its photovoltaic performance

Nächster Artikel Enhanced visible light-driven photodegradation of rhodamine B by Ti3+ self-doped TiO2@Ag nanoparticles prepared using Ti vapor annealing

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Titel: Hierarchical NiCo2O4/MnO2 core–shell nanosheets arrays for flexible asymmetric supercapacitor
verfasst von: Jianfang Zhang
Yan Wang
Cuiping Yu
Tianyu Zhu
Yang Li
Jiewu Cui
Jingjie Wu
Xia Shu
Yongqiang Qin
Jian Sun
Jian Yan
Yong Zhang
Yucheng Wu
Publikationsdatum: 09.09.2019
Verlag: Springer US
Erschienen in: Journal of Materials Science / Ausgabe 2/2020
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-019-03988-6

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