MXenes, as a new family of 2D materials, can be used as film electrodes in energy storage devices because of their hydrophilic surface, metallic conductivity, and rich surface chemistries. However, the poor ion transport of MXene film electrodes causes a great loss of surface reactivity, which significantly inhibits the full exploitation of the potential of MXene-based materials. To solve this issue, we report a facile electrolyte-induced self-assembly method to construct a 3D porous structure in the MXene–rGO hybrid film, which effectively facilitates rapid diffusion and transport of electrolyte ions in the film electrode while still maintaining high electrical conductivity. When the hybrid film is employed as electrode materials for lithium-ion batteries, it exhibits high specific capacity of 335.5 mA h g^–1 at 0.05 A g^–1 and good rate capability of 30% capacitance retention at 4 A g^–1. Additionally, the film electrode exhibits excellent cycling stability without capacity decay after 1000 cycles under high rates (1 A g^–1) owing to its stable structure. Furthermore, the electrochemical analysis also demonstrates that the novel 3D porous microstructure plays an important role in the fast reaction kinetics and high capacity of the MXene–rGO hybrid film electrode. This work may provide a new strategy to solve the issues related to poor ionic transport in MXene-based film electrodes.

中文翻译：

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用于高级锂存储的3D多孔MXene（Ti ₃ C ₂）/氧化石墨烯杂化膜

MXenes作为2D材料的新家族，由于其亲水性表面，金属导电性和丰富的表面化学性质，可以用作储能设备中的薄膜电极。但是，MXene膜电极的离子迁移较差会导致表面反应性大大降低，这大大抑制了MXene基材料的潜力得到充分利用。为了解决这个问题，我们报告了一种简便的电解质诱导的自组装方法，该方法在MXene-rGO杂化膜中构建3D多孔结构，该结构可有效促进电解质离子在膜电极中的快速扩散和运输，同时仍保持高电导率。当混合膜用作锂离子电池的电极材料时，它具有335.5 mA hg ^–1的高比容量在0.05 A g ^–1时具有良好的速率能力，在4 A g ^–1时具有30％的电容保持率。此外，由于薄膜电极结构稳定，因此在高倍率（1 A g ^–1）下经过1000次循环后，仍具有出色的循环稳定性，而容量不衰减。此外，电化学分析还表明，新颖的3D多孔微结构在MXene-rGO杂化膜电极的快速反应动力学和高容量中起着重要作用。这项工作可能会提供一种新的策略来解决与基于MXene的薄膜电极中离子迁移不良有关的问题。