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Materials 2017, 10(6), 580;

Carbon-Supported Pd and PdFe Alloy Catalysts for Direct Methanol Fuel Cell Cathodes

Departamento de Química, Instituto de Materiales y Nanotecnología, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez s/n, La Laguna, Santa Cruz de Tenerife 38200, Spain
Istituto di Tecnologie Avanzate per l’Energia “Nicola Giordano”, CNR. Via Salita S. Lucia sopra Contesse 5, Messina 98126, Italy
Authors to whom correspondence should be addressed.
Academic Editor: Douglas Ivey
Received: 17 March 2017 / Revised: 12 May 2017 / Accepted: 22 May 2017 / Published: 25 May 2017
(This article belongs to the Special Issue Advanced Materials in Polymer Electrolyte Fuel Cells)
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Direct methanol fuel cells (DMFCs) are electrochemical devices that efficiently produce electricity and are characterized by a large flexibility for portable applications and high energy density. Methanol crossover is one of the main obstacles for DMFC commercialization, forcing the search for highly electro-active and methanol tolerant cathodes. In the present work, carbon-supported Pd and PdFe catalysts were synthesized using a sodium borohydride reduction method and physico-chemically characterized using transmission electron microscopy (TEM) and X-ray techniques such as photoelectron spectroscopy (XPS), diffraction (XRD) and energy dispersive spectroscopy (EDX). The catalysts were investigated as DMFC cathodes operating at different methanol concentrations (up to 10 M) and temperatures (60 °C and 90 °C). The cell based on PdFe/C cathode presented the best performance, achieving a maximum power density of 37.5 mW·cm−2 at 90 °C with 10 M methanol, higher than supported Pd and Pt commercial catalysts, demonstrating that Fe addition yields structural changes to Pd crystal lattice that reduce the crossover effects in DMFC operation. View Full-Text
Keywords: palladium; iron; direct methanol fuel cell; oxygen reduction reaction; methanol tolerance palladium; iron; direct methanol fuel cell; oxygen reduction reaction; methanol tolerance

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Rivera Gavidia, L.M.; Sebastián, D.; Pastor, E.; Aricò, A.S.; Baglio, V. Carbon-Supported Pd and PdFe Alloy Catalysts for Direct Methanol Fuel Cell Cathodes. Materials 2017, 10, 580.

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