Flexible Ti3C2Tx/PEDOT:PSS films with outstanding volumetric capacitance for asymmetric supercapacitors
Flexible Ti3C2Tx/PEDOT:PSS films with outstanding volumetric capacitance for asymmetric supercapacitors
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柔性 Ti3C2TX/PEDOT:PSS 薄膜，具有出色的体积电容，适用于非对称超级电容器
DOI：
10.1039/c8dt04374d
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发表时间：
2019-02-07
影响因子：
4
通讯作者：
Zhang, Zhiguo
中科院分区：
文献类型：
--
作者：
Li, Lu;Zhang, Na;Zhang, Zhiguo
MXene是一种二维过渡金属碳化物/氮化物，由于其亲水性、金属导电性和表面氧化还原反应，在未来的电化学储能方面显示出令人兴奋的应用前景，这对于高容量和高倍率电极材料至关重要。然而，相邻MXene薄片在货车德瓦尔斯力下聚集或自再堆叠的强烈趋势限制了MXene基电极在实际应用中的电化学性能。在本研究中，我们开发了一种简单有效的方法来制备Ti 3C 2 Tx/PEDOT：PSS杂化薄膜，通过过滤Ti 3C 2 Tx/Clevios PH 1000复合油墨，然后用H2SO 4处理。H2SO 4处理可以从Ti 3C 2 Tx/PEDOT：PSS杂化膜中去除部分绝缘PSS，从而显著提高复合材料的电导率。此外，导电PEDOT不仅充当Ti 3C 2 Tx片之间的支柱，以暴露更多的电活性表面和减少离子扩散路径，而且还起到导电桥的作用，形成多维电子传输通道，加速电化学反应过程。结果表明，经硫酸处理后的Ti 3C 2 Tx/PEDOT：PSS（Ti 3C 2 Tx/P-100-H）杂化膜比表面积增加了4.5倍，在2 mV s（-1）下的体积电容为1065 F cm（-3），在1 M硫酸电解液中具有优异的上级倍率性能。特别地，我们组装了基于Ti 3C 2 Tx/P-100-H混合负电极和rGO膜正电极的具有优异柔性的非对称超级电容器（ASC），其提供了23 mW h cm（-3）的高能量密度和7659 mW cm（-3）的高功率密度。此外，一个简单的发光带的设计和供电，我们的两个ASC的串联。基于柔性Ti 3C 2 Tx/P-100-H杂化膜电极的ASC的出色的体积电化学性能和能量密度证明了其作为小型便携式和可穿戴电子设备的强大电源的有前途的潜力。
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.