The electrochemical activity of an electrode of carbon nanotubes (CNTs) attached with TiO2 nanoparticles was investigated. A chemical-wet impregnation was used to deposit different TiO2 particle densities onto the CNT surface, which was chemically oxidized by nitric acid. Transmission electron microscopy showed that each TiO2 nanoparticle has an average size of 30–50 nm.