Abstract Zeolitic imidazole frameworks (ZIFs) are a class of metal organic frameworks (MOFs) with diverse energy-related applications. High-surface area materials derived from ZIFs can serve as electrodes with good long-term capacity retention. Herein, we demonstrate an electrospun ZIF7/carbon nanofiber (CNF) derived nanocomposite as a freestanding electrode for supercapacitors with excellent capacitance retention. The optimal ZIF7 composite nanofiber carbonized at 950 °C exhibited a specific capacitance of 202 F·g−1 at a current density of 1 A·g−1 and ~98% specific capacitance retention after 5000 charge–discharge cycles. N-doped nanoporous C and the Zn framework of ZIF7 composite fibers delivered an energy density of 42 W·h·kg−1 at a power density of 0.6 kW·kg−1. These scalable ZIF7/CNF composite textiles (30 × 10 cm2) can be used as freestanding supercapacitor electrodes without a separate substrate or current collector.

中文翻译：

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沸石咪唑酯骨架-7 纺织品衍生的纳米复合纤维作为独立式超级电容器电极

摘要 沸石咪唑骨架（ZIFs）是一类具有多种能源相关应用的金属有机骨架（MOFs）。源自 ZIF 的高表面积材料可用作具有良好长期容量保持率的电极。在此，我们展示了一种电纺 ZIF7/碳纳米纤维 (CNF) 衍生的纳米复合材料作为具有出色电容保持率的超级电容器的独立电极。在 950 °C 下碳化的最佳 ZIF7 复合纳米纤维在 1 A·g-1 的电流密度下表现出 202 F·g-1 的比电容和 5000 次充放电循环后~98% 的比电容保持率。N掺杂的纳米多孔碳和ZIF7复合纤维的Zn骨架在0.6 kW·kg-1的功率密度下提供了42 W·h·kg-1的能量密度。