Metallic few-layered VSe2 nanosheets: high two-dimensional conductivity for flexible in-plane solid-state supercapacitors

Chaolun Wang; Xing Wu; Yonghui Ma; Gang Mu; Yaoyi Li; Chen Luo; Hejun Xu; Yuanyuan Zhang; Jing Yang; Xiaodong Tang; Jian Zhang; Wenzhong Bao; Chungang Duan

doi:10.1039/C8TA00089A

Metallic few-layered VSe₂ nanosheets: high two-dimensional conductivity for flexible in-plane solid-state supercapacitors†

Chaolun Wang,

^a Xing Wu,

*^a Yonghui Ma,^b Gang Mu,^b Yaoyi Li,^c Chen Luo,^a Hejun Xu,

^a Yuanyuan Zhang,^a Jing Yang,^a Xiaodong Tang,^a Jian Zhang,^af Wenzhong Bao

^d and Chungang Duan^ae

Author affiliations

* Corresponding authors

^a Key Laboratory of Polar Materials and Devices (MOE), Shanghai Key Laboratory of Multidimensional Information Processing, Department of Electronic Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, China
E-mail: xwu@ee.ecnu.edu.cn

^b State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

^c Key Laboratory of Artificial Structures and Quantum Control (MOE), School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China

^d State Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, China

^e Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China

^f State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

Abstract

Metallic two-dimensional (2D) 1T-VSe₂ with high conductivity and a large specific surface area is a promising electrode material for supercapacitors. Here, we use a facile chemical vapor deposition (CVD) method to prepare thin VSe₂ nanosheets. A flexible in-plane solid-state supercapacitor is fabricated using the high-quality VSe₂ nanosheets as the electrode material. The prepared supercapacitor presents an electrical double-layer capacitive behavior, and it has a high power density that is comparable with that of advanced graphene-based supercapacitors. The flexible supercapacitor also shows good mechanical stability to both bending and fatigue tests up to 10 000 cycles. This work provides a novel method for the fabrication of high-performance thin-film power sources, and paves the way for their application in soft thin-geometry devices.

Journal of Materials Chemistry A

Metallic few-layered VSe₂ nanosheets: high two-dimensional conductivity for flexible in-plane solid-state supercapacitors†

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Metallic few-layered VSe₂ nanosheets: high two-dimensional conductivity for flexible in-plane solid-state supercapacitors

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Journal of Materials Chemistry A