Sant'Ambrogio di Torino, Italy
Sant'Ambrogio di Torino, Italy

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Gallo J.M.R.,HySyLab | Gallo J.M.R.,University of Campinas | Gallo J.M.R.,University of Piemonte Orientale | Icardi U.A.,HySyLab | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2011

In this study, the construction and optimization of a low cost home-assembled DMFC single cell test station is described. The station was built using two flow control systems, for gas (air/oxygen) and liquid (methanol), a temperature controller, an electronic load, a milliohm-meter for resistance measurements and a computerized data acquisition system. The experiments were carried out on a 6.25 cm2 single cell, built using two graphite plates with triple serpentine channel geometry for both anodic and cathodic flow fields. The cell was equipped with an MEA composed of Nafion 117 as electrolyte, Pt/C based catalyst as cathode and PtRu (1:1)/C as anode. In order to develop a HySyLab internal standard procedure, MEA activation was carefully studied. The activated MEA was used to determine the optimum values of cell operating parameters, such as oxidant flow, methanol flow and temperature. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights.


Gallo J.M.R.,University of Campinas | Gallo J.M.R.,University of Piemonte Orientale | Gatti G.,University of Piemonte Orientale | Graizzaro A.,HySyLab | And 2 more authors.
Journal of Power Sources | Year: 2011

In this work, a new family of materials for electrodes of direct methanol fuel cell (DMFC) is presented. Mesoporous carbon ceramics (MCCs) are obtained by the addition of commercial graphite into the synthesis gel of SBA-15 mesoporous silica with SiO 2/C weight ratios of 1/1 and 1/3. X-ray diffraction confirms both the formation of organized silica and the presence of graphite, and nitrogen physisorption measurements show that the presence of a graphitic phase does not interfere in the silica pore diameter although it diminishes the surface area. The MCCs modified with Pt or PtRu are tested as DMFC electrodes and compared with the commercial support Vulcan XC-72R. When used as cathode, the system using MCC-SBA-15 with SiO 2/C weight ratios of 1/1 presents a negligible performance, while the MCC-SBA-15 with SiO 2/C weight ratios of 1/3 is 2.9 times less active than the commercial support. On the other side, when used as anode, the MCC-SBA-15 with SiO 2/C weight ratios of 1/3 displays performances comparable to Vulcan XC-72R. © 2011 Elsevier B.V. All rights reserved.

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