Performance of Liquid Fuels in a Platinum-Ruthenium-Catalysed Polymer Electrolyte Fuel Cell: HIGHER MOLECULAR WEIGHT COMPOUNDS AS FUELS FOR A PEFC

By Annukka Santasalo; Tanja Kallio; Kyösti Kontturi

doi:10.1595/147106709X416040

ISSN: 0032-1400

oa Performance of Liquid Fuels in a Platinum-Ruthenium-Catalysed Polymer Electrolyte Fuel Cell

HIGHER MOLECULAR WEIGHT COMPOUNDS AS FUELS FOR A PEFC
Authors: By Annukka Santasalo¹, Tanja Kallio¹ and Kyösti Kontturi¹
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Affiliations: ¹ Research Group of Physical Chemistry, Department of Chemistry, Helsinki University of TechnologyPO Box 6100, FI-02015 TKKFinland
Source: Platinum Metals Review, Volume 53, Issue 2, Apr 2009, p. 58 - 66
DOI: https://doi.org/10.1595/147106709X416040
- Published online: 01 Jan 2009

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Abstract

Crossover and performance of different 1 M low molecular weight organic fuels with a platinum-ruthenium (60:40) catalyst in a unit fuel cell were studied at different temperatures. Large, negatively charged or complicated molecules were found to have the lowest crossover rates through the Nafion^®115 membrane, and methanol had the highest permeability at all temperatures. The smallest molecule, formic acid, dissociates in water, resulting in a less severe crossover problem. In a PtRu-catalysed fuel cell, compounds with only one carbon atom exhibit superior performance compared to molecules having a carbon chain; with methanol and formaldehyde producing power densities up to five times higher than those achieved with molecules having a longer carbon chain. However, it should be noted that PtRu does not catalyse the breaking of the C–C bond; therefore, larger molecules can only be oxidised to derivative products. However, larger organic molecules show a lower rate of crossover through the Nafion^®membrane, which enables more concentrated solutions to be used to decrease the volume of the fuel. With the addition of a third metal to the PtRu-based catalyst, higher molecular weight molecules are good candidates for energy sources in a fuel cell.

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Performance of Liquid Fuels in a Platinum-Ruthenium-Catalysed Polymer Electrolyte Fuel Cell

Platinum Metals Review 53, 58 (2009); https://doi.org/10.1595/147106709X416040

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oa Performance of Liquid Fuels in a Platinum-Ruthenium-Catalysed Polymer Electrolyte Fuel Cell

HIGHER MOLECULAR WEIGHT COMPOUNDS AS FUELS FOR A PEFC

Abstract

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