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Tubular TiO 2 Nanostructures: Toward Safer Microsupercapacitors
Author(s) -
Salari Maryam,
Aboutalebi Seyed Hamed,
Ekladious Iriny,
Jalili Rouhollah,
Konstantinov Konstantin,
Liu Hua Kun,
Grinstaff Mark W.
Publication year - 2018
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201700194
Subject(s) - materials science , electrolyte , nanotechnology , electrode , capacitance , anodizing , titanium dioxide , fabrication , electrochemistry , chemical engineering , titanium , biocompatibility , nanostructure , composite material , chemistry , medicine , aluminium , alternative medicine , pathology , engineering , metallurgy
Abstract Self‐organized tubular nanostructures, synthesized through straightforward and efficient techniques, are anisotropic materials, catalyzing many research breakthroughs, and, are of interest as electrode materials for electrochemical microdevices. The fabrication and characterization of microsupercapacitors composed of self‐assembled titanium dioxide (TiO 2 ) nanotubes, as a combined current collector and electrode, are described. Moreover, conventional toxic acidic or alkaline electrolytes are not required, and the device operates with phosphate buffered saline as the electrolyte. Higher volumetric capacitance (84 F cm −3 ) and energy density (1.15 mWh cm −3 ) values are obtained with the anodized TiO 2 microsupercapacitor devices compared with the conventional ones that employ carbon‐based electrodes and organic electrolytes. Achieving high capacitance through the use of a safe neutral aqueous electrolyte, combined with the biocompatibility of TiO 2 and Ti films, opens up new avenues for the utilization of this system and its design for energy delivery or harvesting in biological and medical applications.