ABSTRACT: Electrical, mechanical, and electrochemical properties are crucial for the materials used as electrodes in a fl exible supercapacitor. In this work, we designed and fabricated a novel category of carbon nano fiber mats, in which carbon nano fi bers are cross-linked and decorated with graphene quantum dots. The morphology, mechanical property, and electrochemical performance of as-obtained carbon nano fi ber mats were characterized systematically. It was illustrated that the carbonized fi brous character, cross-linking structure, and the surface decoration with graphene quantum dots were the key factors determining their mechanical and electrochemical performances as a binder-free electrode for a fl exible supercapacitor. The prototype fl exible supercapacitors assembled with the as-prepared carbon nano fi ber mats showed a manifest power density of 26 kW kg−1 while the energy density is 6.4 Wh kg− 1, long-term cycling stability, and, pronouncedly, decent mechanical property, which hint at the potential for the practical application of the as-prepared carbon nano fiber mats.
