Controllable Synthesis of Atomically Thin Type-II Weyl Semimetal WTe2 Nanosheets : An Advanced Electrode Material for All-Solid-State Flexible Supercapacitors

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Peng Yu
  • Wei Fu
  • Qingsheng Zeng
  • Junhao Lin
  • Cheng Yan
  • Zhuangchai Lai
  • Bijun Tang
  • Kazu Suenaga
  • Zheng Liu

Detail(s)

Original languageEnglish
Article number1701909
Journal / PublicationAdvanced Materials
Volume29
Issue number34
Online published10 Jul 2017
Publication statusPublished - 13 Sept 2017
Externally publishedYes

Abstract

Compared with 2D S-based and Se-based transition metal dichalcogenides (TMDs), Te-based TMDs display much better electrical conductivities, which will be beneficial to enhance the capacitances in supercapacitors. However, to date, the reports about the applications of Te-based TMDs in supercapacitors are quite rare. Herein, the first supercapacitor example of the Te-based TMD is reported: the type-II Weyl semimetal 1Td WTe2. It is demonstrated that single crystals of 1Td WTe2 can be exfoliated into the nanosheets with 2–7 layers by liquid-phase exfoliation, which are assembled into air-stable films and further all-solid-state flexible supercapacitors. The resulting supercapacitors deliver a mass capacitance of 221 F g−1 and a stack capacitance of 74 F cm−3. Furthermore, they also show excellent volumetric energy and power densities of 0.01 Wh cm−3 and 83.6 W cm−3, respectively, superior to the commercial 4V/500 µAh Li thin-film battery and the commercial 3V/300 µAh Al electrolytic capacitor, in association with outstanding mechanical flexibility and superior cycling stability (capacitance retention of ≈91% after 5500 cycles). These results indicate that the 1Td WTe2 nanosheet is a promising flexible electrode material for high-performance energy storage devices.

Research Area(s)

  • 1Td WTe2, 2D materials, energy storage devices, supercapacitors

Citation Format(s)

Controllable Synthesis of Atomically Thin Type-II Weyl Semimetal WTe2 Nanosheets: An Advanced Electrode Material for All-Solid-State Flexible Supercapacitors. / Yu, Peng; Fu, Wei; Zeng, Qingsheng et al.
In: Advanced Materials, Vol. 29, No. 34, 1701909, 13.09.2017.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review