Nicholson, P G; Zhou, S; Hinds, G; Wain, A J; Turnbull, A (2009) Electrocatalytic activity mapping of model fuel cell catalyst films using scanning electrochemical microscopy. Electrochim. Acta, 54 (19). pp. 4525-4533.

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Abstract

Scanning electrochemical microscopy has been employed to spatially map the electrocatalytic activity of model proton exchange membrane fuel cell (PEMFC) catalyst films towards the hydrogen oxidation reaction (the PEMFC anode reaction). The model catalyst films, based on platinum-loaded carbon nanoparticles, mimicked the composition, structure and three-phase boundary conditions present in PEMFCs. The electrochemical characterisation was correlated with a detailed physical characterisation using dynamic light scattering, transmission electron microscopy and field-emission scanning electron microscopy. The nanoparticles were found to be reasonably mono-dispersed, with a tendency to agglomerate into porous bead-type structures when spun-cast. The number of carbon nanoparticles with little or no platinum was surprisingly higher than would be expected based on the platinum-carbon mass ratio. Furthermore, the platinum-rich carbon particles tended to agglomerate and the clusters formed were non-uniformly distributed. This morphology was reflected in a high degree of heterogeneity in the film activity towards the hydrogen oxidation reaction.

Item Type:	Article
Keywords:	Scanning electrochemical microscopy, SECM, fuel cells, catalysts, hydrogen oxidation, platinum nanoparticles
Subjects:	Advanced Materials Advanced Materials > Fuels Cells
Last Modified:	02 Feb 2018 13:15
URI:	http://eprintspublications.npl.co.uk/id/eprint/4489

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