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Titanium Dioxide Nanotubes as Model Systems for Electrosorption Studies

Titanium Dioxide Nanotubes as Model Systems for Electrosorption Studies


Title: Titanium Dioxide Nanotubes as Model Systems for Electrosorption Studies
Author: Li, Xian
Pustulka, Samantha
Pedu, Scott
Close, Thomas
Xue, Yuan
Richter, Christiaan   orcid.org/0000-0002-6563-4923
Taboada-Serrano, Patricia
Date: 2018-06-05
Language: English
Scope: 404
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Iðnaðarverkfræði-, vélaverkfræði- og tölvunarfræðideild (HÍ)
Faculty of Industrial Eng., Mechanical Eng. and Computer Science (UI)
Series: Nanomaterials;8(6)
ISSN: 2079-4991
DOI: 10.3390/nano8060404
Subject: Electrosorption; Titania nanotubes; Nanostructured electrodes; Rafeindaverkfræði
URI: https://hdl.handle.net/20.500.11815/944

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Citation:

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(6):404. doi:10.3390/nano8060404

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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