Mesoporous-TiO2 nanoparticles based carbon paste electrodes exhibit enhanced electrochemical sensitivity for phenols

Lin, Huogang and Ji, Xiaobo and Chen, Qiyuan and Zhou, Yikai and Banks, Craig E. and Wu, Kangbing (2009) Mesoporous-TiO2 nanoparticles based carbon paste electrodes exhibit enhanced electrochemical sensitivity for phenols. ISSN 1388-2481

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Abstract

Mesoporous-TiO2 nanoparticles (meso-TiO2) and nano-TiO2 particles (nano-TiO2) were synthesized and characterized using scanning electron microscopy. The electrochemical behaviours of carbon paste electrodes (CPE), nano-TiO2/CPE and meso-TiO2/CPE were investigated using K3[Fe(CN)6] as the electrochemical probe. It was observed that the peak potential separation was remarkably decreased at the meso-TiO2/CPE with higher peak currents in comparison with the other two CPEs. Moreover, the electrochemical performance towards phenol and p-substituted phenol detection was studied with remarkably enhanced oxidation signals at meso-TiO2/CPE. The meso-TiO2 shows considerable surface enhancement effects towards phenols which increase linearly with Hammett’s constants. Additionally at higher NaCl concentrations, the oxidation peak currents of phenols notably increases at meso-TiO2/CPE, while remaining unchanged at CPE and nano-TiO2/CPE. In summary meso-TiO2 nanoparticles are superior electrode materials for electrocatalysis.

Item Type: Article
Additional Information: Citation: Electrochemistry communications, 2009, vol. 11, no. 10, pp.1990-1995.
Divisions: Faculties > Faculty of Science and Engineering > Department of Chemistry and Materials
Date Deposited: 08 Dec 2009 15:01
Last Modified: 20 Jul 2016 01:17
URI: http://e-space.mmu.ac.uk/id/eprint/87545

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