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Advances in Materials Science and Engineering
Volume 2012 (2012), Article ID 801230, 7 pages
http://dx.doi.org/10.1155/2012/801230
Research Article

Hydrogen Storage Enhancement Attained by Fixation of Ti on MWNTs

1Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S.C. Subdirección de Investigación, Parque Tecnológico Querétaro-Sanfandila, 76703 Pedro Escobedo, QRO, Mexico
2Departamento de Metalmecánica, Instituto Tecnológico de Querétaro, Avenida Tecnológico s/n Esq. M. Escobedo, Col. Centro, 76000 Querétaro, QRO, Mexico
3División de Investigación y Posgrado, Facultad de Ingeniería, Universidad Autónoma de Querétaro (UAQ), Centro Universitario, 76010 Querétaro, QRO, Mexico
4Programa de Ingeniería Molecular, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, A. P. 14-805, 07730 México City, DF, Mexico

Received 23 March 2012; Revised 8 June 2012; Accepted 17 June 2012

Academic Editor: Jasmina Grbovic Novakovic

Copyright © 2012 J. J. Pérez-Bueno et al. 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.

Abstract

Nowadays, hydrogen has a preponderant position among the potentially sustainable energy sources. Due to its power density, its storage is of main concern when considering a broad use in practical applications. Carbon nanotubes constitute promising candidates for the design and construction of hydrogen storage devices. This work explores the use of some procedures involving electrochemistry, aimed to bond atomic Ti on the outer surface of MWNTs. Each titanium atom has the potential of hosting two hydrogen molecules and relinquishing them by heating. Nevertheless, nanotubes are difficult to handle due to electrostatic charge and agglomeration, and in this context, two routes were tested as procedures to spread and stick nanotubes on an electrode: (1) a functionalization capable of attaching gold was tested in two forms, as either using 4 nm particles or a flat gold electrode. The fixation of Au particles was confirmed by HRTEM. (2) A simpler route that consisted on drying a CH2Cl2/nanotubes solution previously spread on a glassy carbon flat electrode. CH2Cl2 was selected as the medium and TiCl4 as the precursor for attaching atomic Ti to the nanotubes. The results revealed that hydrogen adsorption, estimated from voltamperometry, was five times higher on Ti-MWNTs than on bare nanotubes.