Nitrogen-doped hierarchical porous CNF derived from fibrous structured hollow ZIF-8 for a high-performance supercapacitor electrode

Hollow ZIF-8 was assembled into fiber to fabricate a nitrogen-doped hierarchical porous CNF electrode, which exhibits specific capacitance of 394 F g−1 at 1 A g−1 and excellent rate performance with a retention of up to 76.1% at 20 A −1, exceeding those of many previously reported 1D carbon materials.