Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 824, Issue -, Pages 136-146Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2018.07.040
Keywords
Flexible films; WS2 nanosheets; PEDOT:PSS; Cycling stability; Supercapacitors
Categories
Funding
- National Natural Science Foundation of China [51662012, 51572117, 51463008]
- Natural Science Foundation of Jiangxi Province [20171BAB206013]
- Jiangxi Outstanding Young Talent Fund Projects [20171BCB23076]
- Innovation Driven 5511 Project of Jiangxi Province [20165BCB18016]
- Scientific Research Projects of Jiangxi Science and Technology Normal University [2016QNBJRC001]
- Jiangxi Provincial Department of Education [GJJ160762]
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Layered WS2 nanosheet has advantages in the application of energy devices because of its distinctive structure and high electrochemical behaviors. The fabrication of high-quality free-standing WS2 film is anticipant and challenging in developing its flexible and miniature device. Here, using a highly conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as binder, flexible free-standing WS2/PEDOT:PSS film as miniature supercapacitors electrode materials was easily prepared by vacuum filtration method. TheWS(2)/ PEDOT:PSS film was characterized by scanning electron microscopy, high resolution transmission electron microscopy, atomic force microscopy, Raman spectrum, X-ray photoelectron spectroscopy and electrochemical technology. The free-standing WS2/PEDOT:PSS film with conductivity of 44 S cm(-1) showed a good flexibility, robustly mechanical property and high electrochemical behaviors. The flexible film can bear 300 g weight and be used as a conducting wire in a circuit. The WS2/PEDOT:PSS film with thickness of similar to 2.1 mu m exhibited high areal capacitance of 86 mF cm(-2) and volumetric capacitance of 411 F cm(-3) at 40 mV s(-1) in 1.0 M H2SO4 solution. Besides, the capacitance retention could reach 107% of initial specific capacitance after 5000 charge-discharge cycles. Moreover, the flexible device based on WS2/PEDOT:PSS films could be assembled without any substrates and showed a volumetric capacitance of 87 F cm(-3) at 10 mV s(-1) and 86% capacitance retention of initial specific capacitance after 5000 cycles. These results implied the flexible free-standing WS2/PEDOT:PSS film has a potential application in flexible and miniature supercapacitors without any other substrates as current collectors.
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