Free-standing, highly flexible and foldable supercapacitor electrodes were fabricated through the spray-coating assisted layer-by-layer assembly of Ti₃C₂T_x (MXene) nanoflakes together with multi-walled carbon nanotubes (MWCNTs) on electrospun polycaprolactone (PCL) fiber networks. The open structure of the PCL network and the use of MWCNTs as spacers not only limit the restacking of Ti₃C₂T_x flakes but also increase the accessible surface of the active materials, facilitating fast diffusion of electrolyte ions within the electrode. Composite electrodes have areal capacitance (30–50 mF cm⁻²) comparable to other templated electrodes reported in the literature, but showed significantly improved rate performance (14–16% capacitance retention at a scan rate of 100 V s⁻¹). Furthermore, the composite electrodes are flexible and foldable, demonstrating good tolerance against repeated mechanical deformation, including twisting and folding. Therefore, these tens of micron thick fiber electrodes will be attractive for applications in energy storage, electroanalytical chemistry, brain electrodes, electrocatalysis and other fields, where flexible freestanding electrodes with an open and accessible surface are highly desired.

中文翻译：

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MXene和碳纳米管在静电纺丝聚合物膜上的分层组装，用于灵活的能量存储†

通过在电纺聚己内酯（PCL）上喷涂Ti ₃ C ₂ T _x（MXene）纳米薄片与多壁碳纳米管（MWCNT）的喷涂辅助层组装来制造独立的，高度柔性和可折叠的超级电容器电极。）光纤网络。PCL网络的开放结构以及使用MWCNT作为间隔物，不仅限制了Ti ₃ C ₂ T _x薄片的重新堆叠，而且还增加了活性材料的可及表面，从而促进了电解质离子在电极内的快速扩散。复合电极的面电容（30–50 mF cm ^-2）可与文献中报道的其他模板电极相比，但显示出显着改善的速率性能（在100 V s ^-1的扫描速率下电容保持率为14–16％）。此外，复合电极是柔性和可折叠的，显示出对包括扭曲和折叠在内的反复机械变形的良好耐受性。因此，这数十微米厚的纤维电极对于能量存储，电分析化学，脑电极，电催化和其他领域中的应用具有吸引力，在这些领域中，非常需要具有开放且可接近的表面的柔性独立式电极。