Flexible electrode materials have gained significant breakthroughs recently due to their freestanding nature and long-term stability. The integration of MXene into carbon nanofiber leads to improved conductivity and stability. Herein, we employed an electrospinning technique to prepare self-standing MXene (Ti₃C₂T_x) carbon nanofiber (MX-CNF), onto which a one-dimensional π–d conjugated conductive metal–organic framework (c-MOF) is uniformly coated, exhibiting outstanding properties. The enhanced specific capacitance and conductivity is due to π–d mode of electron transfer in c-MOF on MX-CNF leads to improved conductivity. The obtained composite material achieved a specific capacitance of 1076 F g⁻¹ with an excellent rate capability and superior cycling retention of 86.4% after 15 000 cycles owing to its self-standing nature and ultra-stability. The electrode materials show better conductivity, hydrophilicity, and flexibility. A fabricated flexible asymmetric energy storage device achieved an energy density of 45.7 W h kg⁻¹ with outstanding cycling stability. The flexible device was tested for different bending angles, maintaining its flexibility and ensuring no deformation occurred. The CV curves retains its orignal shapes at different bending angles. This work offers a new avenue for utilizing 1D conductive MOF on 2D material-based conductive nanofibers for flexible energy storage systems.

中文翻译：

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在 MXene-碳纳米纤维上装饰的 π-d 共轭金属有机框架，作为柔性超级电容器的自立式电极


柔性电极材料由于其独立性和长期稳定性，最近取得了重大突破。将 MXene 整合到碳纳米纤维中可提高导电性和稳定性。在此，我们采用静电纺丝技术制备了自立式 MXene （Ti₃C₂T_x） 碳纳米纤维 （MX-CNF），在其上均匀涂覆了一维 π-d 共轭导电金属-有机框架 （c-MOF），表现出优异的性能。增强的比电容和电导率是由于 MX-CNF 上 c-MOF 中的 π-d 电子转移模式导致电导率提高。所获得的复合材料实现了 1076 F g⁻¹ 的比电容，由于其自立式和超稳定性，在 15 000 次循环后具有优异的倍率能力和 86.4% 的优异循环保持率。电极材料表现出更好的导电性、亲水性和柔韧性。一种制造的柔性非对称储能器件实现了 45.7 W h ^kg-1 的能量密度，具有出色的循环稳定性。该柔性装置针对不同的弯曲角度进行了测试，保持了其柔韧性并确保没有发生变形。CV 曲线在不同弯曲角度下保持其原始形状。这项工作为在基于 2D 材料的 1D 导电纳米纤维上利用 1D 导电 MOF 用于柔性储能系统提供了一条新途径。