In this paper, we have synthesized the two-dimensional (2D) MXene layers and acid activated carbon (AAC) into a 3D conductive network structure, which could prevent the serious aggregation of 2D MXene layers. Two-dimensional MXene furnishes a new perspective and possibility to assemble flexible and conductive electrodes without any current collector, binders, or conductive additives when applied to energy storage devices. In the 3D conductive network architecture, the AAC particles are enclosed by the MXene flakes and enlarge the interlamellar spacing of MXene and considerably improve the electrochemical performance. The flexible MXene/AAC 2:1 electrode exhibits a high specific capacity (378 F g^–1 at 0.5 A g^–1). Also, MXene/AAC 2:1 electrode shows an excellent capacitance retention (88.9% at 30 A g^–1). In addition, the MXene/AAC compounds with different mass ratios used as positive electrodes and AAC used as the negative electrode to assemble asymmetrical supercapacitors exhibit exceptional electrochemical performances. The MXene/AAC 2:1//AAC achieves a high specific capacity (177 F g^–1 at 0.5 A g^–1) and an excellent capacitance retention (97.4% retention after 10 000 cycles). Impressively, the 3D conductive network structure of MXene/AAC compounds achieved noteworthy adsorption capacity (311.5 mg/g) to remove methylene blue (MB).

中文翻译：

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用于高性能超级电容器和亚甲基蓝吸附的无粘结剂二维MXene /酸活性炭

在本文中，我们已经将二维（2D）MXene层和酸活性炭（AAC）合成为3D导电网络结构，这可以防止2D MXene层的严重聚集。二维MXene应用于储能装置时，无需任何集电器，粘合剂或导电添加剂即可提供柔性和导电电极组装的新视角和可能性。在3D导电网络体系结构中，AAC颗粒被MXene薄片包围，并扩大了MXene的层间间距，并显着提高了电化学性能。柔性MXene / AAC 2:1电极表现出高的比容量（378 F G ^-1在0.5 A克^-1）。同样，MXene / AAC 2：1电极显示出出色的电容保持率（30 A g ^–1时为88.9％）。此外，具有不同质量比的MXene / AAC化合物用作正电极，而AAC用作负电极以组装不对称超级电容器，它们具有出色的电化学性能。所述MXene / AAC 2：1个// AAC实现了高的比容量（177 F G ^-1 0.5 A G ^-1）和优异的电容保持率（10 000次循环后97.4％保留）。令人印象深刻的是，MXene / AAC化合物的3D导电网络结构达到了显着的吸附容量（311.5 mg / g），可去除亚甲基蓝（MB）。