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Flexible Ti3C2Tx/PEDOT:PSS films with outstanding volumetric capacitance for asymmetric supercapacitors

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Abstract

MXenes are two-dimensional transition metal carbides/nitrides, and they have shown exciting application prospects for electrochemical energy storage in the future owing to their hydrophilicity, metallic conductivity and surface redox reactions, which are crucial for high-capacitance and high-rate electrode materials. However, the strong tendency of adjacent MXene flakes to aggregate or self-restack under the van der Waals force limits the electrochemical performance of MXene-based electrodes for practical applications. In this study, we developed a simple and effective method to prepare Ti3C2Tx/PEDOT:PSS hybrid films via filtering the Ti3C2Tx/Clevios PH1000 compound inks, followed by H2SO4 treatment. H2SO4 treatment could remove part of the insulating PSS from the Ti3C2Tx/PEDOT:PSS hybrid film, resulting in significant conductivity enhancement of the composite. Furthermore, the conductive PEDOT not only acted as a pillar between Ti3C2Tx sheets to expose more electroactive surfaces and reduce ion diffusion pathways but also played a role as a conductive bridge to form multidimensional electronic transport channels for accelerating the electrochemical reaction process. As a result, the as-prepared H2SO4-treated Ti3C2Tx/PEDOT:PSS (Ti3C2Tx/P-100-H) hybrid film exhibited 4.5-fold increase in the specific surface area and high volumetric capacitance of 1065 F cm−3 at 2 mV s−1 with superior rate performance in 1 M H2SO4 electrolyte. Especially, we assembled an asymmetric supercapacitor (ASC) with excellent flexibility based on a Ti3C2Tx/P-100-H hybrid negative electrode and rGO film positive electrode, which delivered high energy density of 23 mW h cm−3 and high power density of 7659 mW cm−3. Moreover, a simple luminous band was designed and powered by our two ASCs in series. The outstanding volumetric electrochemical performance and energy density of the ASC based on the flexible Ti3C2Tx/P-100-H hybrid film electrode demonstrated its promising potential as a strong power source for small portable and wearable electronic devices.

Graphical abstract: Flexible Ti3C2Tx/PEDOT:PSS films with outstanding volumetric capacitance for asymmetric supercapacitors

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Publication details

The article was received on 03 Nov 2018, accepted on 22 Dec 2018 and first published on 26 Dec 2018


Article type: Paper
DOI: 10.1039/C8DT04374D
Citation: Dalton Trans., 2019, Advance Article
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    Flexible Ti3C2Tx/PEDOT:PSS films with outstanding volumetric capacitance for asymmetric supercapacitors

    L. Li, N. Zhang, M. Zhang, X. Zhang and Z. Zhang, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C8DT04374D

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