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A new hybrid nanocomposite of carbon-coated highly ordered TiO2 nanotube arrays(C/TNAs)decorated with pseudocapacitive material NiCo2O4 is presented in this paper.The electrical conductivity of TNAs can be improved by coating carbon along the whole surface of the tubes by self-coating technology [1,2],and then NiCo2O4 is synthesized by the means of chemical bath deposition(CBD),followed by controlled annealing process in the protective atmosphere of argon.