Fabrication of a mesoporous Co(OH)2/ITO nanowire composite electrode and its application in supercapacitors

A novel mesoporous alpha-Co(OH)(2)/ITO NWs heterostructure has been successfully synthesized via a new method of combining chemical vapor deposition (CVD) on a titanium substrate and electrodeposition through a hexagonal lyotropic liquid crystalline (LLC) phase for electrochemical energy storage application. Electrochemical measurements demonstrate the improved ionic conductivity of an electrode and enhanced supercapacitive behavior, as compared to a mesoporous cobalt hydroxide film on a titanium current collector without indium tin oxide (ITO) NWs as electron highways. Galvanostatic charge-discharge measurements in 1M KOH solution prove that the electrode of the as-prepared heterostructure possesses excellent electrochemical capacitance, in the potential range from -0.1 V to 0.5 V with a maximum specific capacitance of 1128 F g(-1) at a discharge current density of 1 A g(-1). The unique mesoporous alpha-Co(OH)(2)/ITO NWs heterostructure provides a high capacitance retention ratio at high discharge current densities and long-term electrochemical stability in an alkaline solution.