Titanium Dioxide Nanotubes as Model Systems for Electrosorption Studies
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nanomaterials-08-00404.pdf
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2.41 MB
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Author(s)
Li, Xian
Pustulka, Samantha
Pedu, Scott
Xue, Yuan
Richter, Christiaan
Taboada-Serrano, Patricia
Close, Thomas Charles
Date Issued
June 2018
Journal
Nanomaterials
Publisher
Multidisciplinary Digital Publishing Institute
Citation
LI, Xian, Samantha Pustulka, Scott Pedu, Thomas Close, Yuan Xue, Christiaan Richter and Patricia Taboada-Serrano. "Titanium Dioxide Nanotubes as Model Systems for Electrosorption Studies." Nanomaterials, 2018, 8(6), 404.
Version
Final published version
Abstract
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.
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DOI of Published Version
https://doi.org/10.3390/nano8060404
