A novel cobalt-carbon composite for the electrochemical supercapacitor electrode material

Metallic cobalt/carbon composites were synthesized by metal-organic framework as precursor via a facile method in the paper. The obtained cobalt nanoparticles are 5-10 nm in size and anchor on carbon homogeneously. The results indicate that metallic cobalt particles have excellent dispersion feature on the surface of carbon. The electrochemical performance of metallic cobalt/carbon composites was characterized by Cyclic voitammetry (CV) and galvanostatic charge/discharge tests. The specific capacitance of the composite material is up to 144.5 F g(-1) at current density of 0.5 A g(-1) with a capacitance retention rate of 96.5% at current density of 2 A g(-1). The results suggest that synergistic performance can be achieved by combining metallic cobalt and carbon, which inherits the overall system with enhanced electrochemical performance. (C) 2015 Elsevier B.V. All rights reserved.