Niobium carbide nanofibers as a versatile precursor for high power supercapacitor and high energy battery electrodes

摘要: This study presents electrospun niobium carbide/carbon (NbC/C) hybrid nanofibers, with an average diameter of 69 ± 30 nm, as a facile precursor to derive either highly nanoporous carbide-derived carbon (NbC–CDC) fibers for supercapacitor applications or pentoxide/carbon (Nb2O5/C) battery-like energy storage. In all cases, the electrodes consist binder-free and free-standing nanofiber mats that can be used without further conductive additives. Chlorine gas treatment conformally transforms NbC into NbC–CDC specific surface area 1508 m2 g−1. These nanofibers show maximum 19.5 W h kg−1 at low power 7.6 high kW in organic electrolyte. CO2 T-Nb2O5/C provide capacity 156 mA The presence graphitic enabled handling, maintaining 50% initial storage rate 10 A g−1 (64 C-rate). When benchmarked asymmetric full-cell, 86 was obtained. both systems, T-Nb2O5/C, resulted from excellent charge propagation continuous network graphitization structure.