This work was supported by the Bar-Ilan University Fund for Advanced Materials of Nanotechnology. The authors are grateful to Prof. A. Nudelman from the Department of Chemistry, Bar-Ilan University for his interest in this work and helpful suggestions.
Carbon Electrodes Modified with TiO2/Metal Nanoparticles and Their Application for the Detection of Trinitrotoluene†
Article first published online: 18 APR 2007
Copyright © 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 17, Issue 9, pages 1487–1492, June, 2007
How to Cite
Filanovsky, B., Markovsky, B., Bourenko, T., Perkas, N., Persky, R., Gedanken, A. and Aurbach, D. (2007), Carbon Electrodes Modified with TiO2/Metal Nanoparticles and Their Application for the Detection of Trinitrotoluene. Adv. Funct. Mater., 17: 1487–1492. doi: 10.1002/adfm.200600714
- Issue published online: 1 JUN 2007
- Article first published online: 18 APR 2007
- Manuscript Revised: 11 OCT 2006
- Manuscript Received: 6 AUG 2006
- Bar-Ilan University Fund for Advanced Materials of Nanotechnology
- Titanium oxides
The preparation of modified, catalytically active, functional carbon electrodes and their application to the electrochemical reduction of trinitrotoluene (TNT) is reported. Modification of the electrodes is performed with composites of nanometer-sized, mesoporous titanium dioxide, which acts as a support containing inserted/deposited nanoparticles of ruthenium, platinum, or gold. These composites are prepared by a novel sonochemical synthesis using simple and low-cost precursors. Cyclic voltammetry shows that 2,4,6-trinitrotoluene can be reduced on thus-modified carbon-paper electrodes at potentials of around –0.5 V (vs. Ag/AgCl/Cl–) in aqueous solutions. Unexpectedly, carbon-paper electrodes modified with the TiO2/nano-Pt composites demonstrate a remarkable electrochemical activity toward the reduction of trinitrotoluene. A significant finding is that the two electrode processes—the reduction of TNT and of oxygen—are quite well separated in potential on the modified carbon-paper electrodes because of selective electrochemical activity of the TiO2/nano-Pt and TiO2/nano-Au composites. TiO2/nano-Ru composites are found to be much less electrochemically active for the detection of TNT compared to the previous two. It was also established that the titanium dioxide support of TiO2/nano-Pt composites plays a specific role for facilitating the TNT- and oxygen-reduction processes.