TiO2 nanotube array as biocompatible electrode in view of implantable supercapacitors

•TiO2 nanotubes array as biocompatible electrodes for implantable supercapacitors.•TiO2 nanotubes morphology and crystallographic phase investigation.•Biocompatible components: PDMS packaging, glass fiber separator, PBS electrolyte.•New insights for implantable, flexible and stable supercapacitors fabrication.

In this paper we propose the exploitation of TiO2 nanotube arrays as biocompatible electrodes for implantable supercapacitors. TiO2 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 TiO2 nanotubes array for future implantable supercapacitors.

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