TiO 2 nanotube array as biocompatible electrode in view of implantable supercapacitors

In this paper we propose the exploitation of TiO 2 nanotube arrays as biocompatible electrodes for implantable supercapacitors. TiO 2 nanotubes are obtained by anodic oxidation of titanium foil and the assembly of the whole energy storage device is conducted using only biocompatible materials: PDMS is selected as packaging material both for its biocompatibility and easy fabrication process, glass-fiber filter acts as separator and the Dulbecco’s Phosphate Buffered Saline solution as physiological electrolyte. Electrochemical characterizations of the proposed flexible device reveal promising performances of TiO 2 nanotubes array for future implantable supercapacitors.