Scalable fabrication of polyaniline nanodots decorated MXene film electrodes enabled by viscous functional inks for high-energy-density asymmetric supercapacitors
Scalable fabrication of polyaniline nanodots decorated MXene film electrodes enabled by viscous functional inks for high-energy-density asymmetric supercapacitors
复制标题
高能量密度非对称超级电容器粘性功能油墨修饰聚苯胺纳米点修饰MXene膜电极的可扩展制备
DOI：
10.1016/j.cej.2020.126664
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发表时间：
2021-02
影响因子：
15.1
通讯作者：
Yuanming Wang;Xue Wang;Xiaolong Li;Yang Bai;Huanhao Xiao;Yang Liu;Guohui Yuan
中科院分区：
文献类型：
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作者：
Yuanming Wang;Xue Wang;Xiaolong Li;Yang Bai;Huanhao Xiao;Yang Liu;Guohui Yuan
MXene（Ti 3C 2 Tx）薄膜在柔性储能器件，特别是超级电容器中非常受欢迎，因为它具有良好的特性，更重要的是，它具有良好的体积电容。与基于MXene的对称超级电容器相比，通过将正极材料与负极MXene相结合来设计非对称器件可以拓宽工作电压窗口，并进一步提高体积能量密度。然而，具有与原始MXene膜电极相当的体积电容的期望的柔性正电极是罕见的。在本文中，我们证明了合理的层间异质结工程可以使MXene基电极在正电位下同样具有1167 F cm-3的体积性能。将小的PANI纳米颗粒（~10 nm）嵌入MXene夹层中能够实现紧凑的PANI/MXene膜电极。此外，利用功能性PANI/MXene油墨大规模制备复合膜。在电极中，MXene纳米片对聚苯胺纳米粒子具有分散、结合、导电和柔性基底的综合功能。同时，PANI纳米颗粒不仅作为高赝电容材料，而且作为层间导电柱化组分，用于减少MXene堆叠并实现电子和离子传输，从而获得优异的协同效应。此外，组装的非对称装置由全赝电容紧凑膜材料组成，并提供高达65.6 Wh L-1（1687.3 W L-1）的令人难以置信的能量密度，表明该配置非常有效。
MXene (Ti3C2Tx) films are highly favored in flexible energy storage devices, especially supercapacitors because of ultrathin feature and, more importantly, ultrahigh volumetric capacitance. Compared with MXene-based symmetric supercapacitors, designing asymmetric devices by combing positive materials with negative MXene can widen the operating voltage window and further enhance the volumetric energy density. However, the desirable flexible positive electrodes with volumetric capacitance comparable with pristine MXene film electrode are rare. Herein, we demonstrate rational interlayered heterojunction engineering can make MXene-based electrodes likewise possess ultrahigh volumetric performance (1167F cm−3) under positive potential. Intercalating small PANI nanoparticles (~10 nm) into MXene interlayer enables the compact PANI/MXene film electrodes. Furthermore, functional PANI/MXene inks are exploited to fabricate the composite films on a large scale. In the electrode, MXene nanosheets exhibit integrated functions of dispersing, binding, conduction and flexible substrate for PANI nanoparticles. Meanwhile, PANI nanoparticles act as not only high pseudocapacitive materials but also interlayered conductive pillaring components for reducing MXene stacking and enabling electron and ion transport, thereby obtaining an excellent synergistic effect. Additionally, the assembled asymmetric device consists of all-pseudocapacitive compact film materials and delivers an incredible energy density up to 65.6 Wh L-1(1687.3 W L-1), suggesting the configuration highly effective.