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Adv Mater. 2017 Sep;29(34). doi: 10.1002/adma.201701909. Epub 2017 Jul 10.

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

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Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan.


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.


1Td WTe2; 2D materials; energy storage devices; supercapacitors


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