Boron-nitrogen functional groups on porous nanocarbon fibers for electrochemical supercapacitors

► Boron- and nitrogen-containing porous BN-CNFs were prepared through one-step electrospinning. ► The functional groups on the BN-CNF electrode are more accessible to the electrolyte ions. ► The electrode yields better supercapacitor performances because of the porous structure and the pseudo-capacitive effect.