Cobalt hydroxide hexagonal nanoplates anchored on functionalized carbon nanotubes (CNTs) for supercapacitor applications: one-pot electrochemical fabrication of high performance nanocomposite

摘要

β-Co(OH)~(2)/CNTs nanocomposite was prepared through a facile electrodeposition method onto stainless steel grid, and its charge storage capacity in supercapacitor applications was studied. The co-deposition of cobalt hydroxide/CNTs was carried out, for the first time, from a CNTs–COOH dispersed aqueous electrolyte containing 0.005M CoCl~(2). The simple deposition parameters were used, which included direct current mode (10 mA cm_(−2)) at RT conditions. The characterization techniques of XRD, IR, FE-SEM, BET and TEM proved the deposition of crystalline β-Co(OH)~(2)hexagonal nanoplates grown onto electrophoretically deposited CNTs on the cathode surface. BET test indicated that the high surface area of 144.8 m_(2)g_(−1)with micro-porous surface for the fabricated composite. The GCD tests showed excellent charge storage behavior with delivering specific capacitances as high as 1287 F g_(−1)(0.5 A g_(−1)), 1124 F g_(−1)(1 A g_(−1)), 956 F g_(−1)(2 A g_(−1)), 834 F g_(−1)(3 A g_(−1)), 712 F g_(−1)(5 A g_(−1)) and 573 F g_(−1)(10 A g_(−1)) and capacity decay of 10.6% during 5000 cycles.