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Titania nanotube arrays fabricated by anodic oxidation of titanium foil were electrochemical activated in H2SO4 solution by means of cyclic voltammetry (CV).The influence of electrochemical activation on the electrochemical properties and conductivity was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).The experimental results showed that the electrical conductivity of TiO2 nanotube electrochemical activated in H2SO4 solution was improved greatly as compared to the TiO2 nanotube arrays which was not activated.A pair of well defined oxidation/reduction peaks were observed during the cyclic voltammetric scans in 10mM K3[Fe(CN)6]+1M KCl solution.These properties suggest that the titania nanotube electrode is a novel and promising electrode material.Then,as the application,TNT electrode was introduced as a working electrode for detecting various heavy metals ions.