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Nanomaterials 2018, 8(6), 404;

Titanium Dioxide Nanotubes as Model Systems for Electrosorption Studies

Microsystems Engineering Ph.D. Program, Rochester Institute of Technology, Rochester, NY 14623-5603, USA
Department of Chemical Engineering, Rochester Institute of Technology, Rochester, NY 14623-5603, USA
Materials Science Program, University of Rochester, Rochester, NY 14627-0216, USA
Industrial Engineering, Mechanical Engineering and Computer Science, School of Engineering and Natural Sciences, University of Iceland, Reykjavik 600169-2039, Iceland
Author to whom correspondence should be addressed.
Received: 2 April 2018 / Revised: 20 May 2018 / Accepted: 23 May 2018 / Published: 5 June 2018
(This article belongs to the Special Issue Electrochemically Engineering of Nanoporous Materials)
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Highly ordered titanium dioxide nanotubes (TiO2 NTs) were fabricated through anodization and tested for their applicability as model electrodes in electrosorption studies. The crystalline structure of the TiO2 NTs was changed without modifying the nanostructure of the surface. Electrosorption capacity, charging rate, and electrochemical active surface area of TiO2 NTs with two different crystalline structures, anatase and amorphous, were investigated via chronoamperometry, cyclic voltammetry, and electrochemical impedance spectroscopy. The highest electrosorption capacities and charging rates were obtained for the anatase TiO2 NTs, largely because anatase TiO2 has a reported higher electrical conductivity and a crystalline structure that can potentially accommodate small ions within. Both electrosorption capacity and charging rate for the ions studied in this work follow the order of Cs+ > Na+ > Li+, regardless of the crystalline structure of the TiO2 NTs. This order reflects the increasing size of the hydrated ion radii of these monovalent ions. Additionally, larger effective electrochemical active surface areas are required for larger ions and lower conductivities. These findings point towards the fact that smaller hydrated-ions experience less steric hindrance and a larger comparative electrostatic force, enabling them to be more effectively electrosorbed. View Full-Text
Keywords: electrosorption; titania nanotubes; nanostructured electrodes electrosorption; titania nanotubes; nanostructured electrodes

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Li, X.; Pustulka, S.; Pedu, S.; Close, T.; Xue, Y.; Richter, C.; Taboada-Serrano, P. Titanium Dioxide Nanotubes as Model Systems for Electrosorption Studies. Nanomaterials 2018, 8, 404.

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