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Título del libro: Proceedings Of The 1st European Fuel Cell Technology And Applications Conference 2005 - Book Of Abstracts
Título del capítulo: Aqueous deposition of metals on MWCNT to be used as electrocatalyst for PEM fuel cells

Autores UNAM:
SERGIO ALBERTO GAMBOA SANCHEZ; MIGUEL AVALOS BORJA; GABRIEL ALONSO NUÑEZ;

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Autores externos:

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Idioma:

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Año de publicación:
2005

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Palabras clave:

Ammonium Hexachloroplatinate (IV) ((NH4)2PtC16); Electrocatalysts; Fuel cell electrode recycling; Polymer Exchange Membrane Fuel Cells (PEMFC); Carbon black; Carbon nanotubes; Deposition; Diffusion; Oxidation; Particle size analysis; Synthesis (chemical); Transmission electron microscopy; Fuel cells

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Resumen:

Polymer Exchange Membrane Fuel Cells (PEMFC) are considered the new power source technology to be used for portable applications. The PEMFC electrochemical reactions are carried out at low temperature in an acid environment. Pt and Pt alloys nanoparticles supported on carbon black have been used to make electrodes due to their high activity for H2 oxidation and O2 reduction under PEMFC conditions. The hexachloroplatinic acid (H2PtC16) and tetrammineplatinum (II) chloride (Pt(NH3)4C12) have been traditionally used as Pt precursors to support Pt particles on different carbonaceous materials using a range of different methods. Recently, Ammonium Hexachloroplatinate (IV) ((NH4)2PtC16) has been shown to be a good precursor to obtain metallic Pt by thermal decomposition, in addition to being a stable compound easily obtained from a variety of Pt recovery processes, such as fuel cell electrode recycling. Its low decomposition temperature and its relatively high water solubility make it a suitable choice to produce Pt on carbon black for Proton Exchange Membrane (PEM) fuel cells. Carbon materials are preferred as a support for electrocatalysts due to the following advantages. They have a high porosity that facilitates reactant diffusion to the active catalyst and allows the products to leave the reaction sites. They also have a very large specific surface area where the catalyst can be dispersed. Its high conductivity helps to electron transfer. Usually carbon black is used to support metal particles as electrocatalyst for fuel cells. Multi Wall Carbon Nanotubes (MWCNT) present physical and chemical properties that make it ideal as a support of Pt and Pt alloys. They can be used as biosensors and as fuel cells catalysts. The MWCNT structure allows the metal support, either on the surface or inside the nanotubes. Pt on MWCNT has been synthesized using (H2PtC16) and (Pt(NH3)4C12) showing higher activity than the conventional carbon black when used as electrocatalyst in fuel cells for either oxygen reduction or methanol oxidation. In this work, a different family of compounds, Ammonium Metal Hexachloride has been used to synthesize the metal on MWCNT. The MWCNT was synthesized as follows. A solution of Ferrocene dissolved in benzene or toluene was atomized and carried by a flow of Argon into a vycor

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Entidades citadas de la UNAM:

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ISBN:
0791842096
Editorial:

Tipo de producto:
Conference Paper