Mesoporous carbon spheres grafted with carbon nanofibers for high-rate electric double layer capacitors

摘要: Abstract Carbon nanofibers were grafted onto mesoporous carbon spheres to produce “sea urchin-like” with a nanofiber content of 25 wt.%. Because its combined features high electronic conductivity and efficient electrolyte transport, the sea urchin-like assembled in electric double layer capacitors shows outstanding high-rate performance voltammetric scan rate as 3000 mV s−1. Ac impedance analysis that this method grafting promotes percolation ionic transportation electrode, reducing capacitive relaxation time less than one fourth original value. Electrochemical oxidation produces capacitance increase ca. 200% while retaining conductivities electrode.