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.