Extended, Continuous Pt Nanostructures in Thick, Dispersed ...
Extended, Continuous Pt Nanostructures in Thick, Dispersed ...
Extended, Continuous Pt Nanostructures in Thick, Dispersed ...
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National Renewable Energy Laboratory<br />
Innovation for Our Energy Future<br />
Relevance (III)<br />
<strong>Dispersed</strong> Electrode Studies<br />
20 nm<br />
LANL cathode layer<br />
25 nm<br />
SEM of 3M’s NSTF MEA<br />
http://www.hydrogen.energy.gov/pdfs/review04/fc_4_debe.pdf<br />
HR-TEM Karren More ORNL<br />
Electrode Studies<br />
Objective: Effectively <strong>in</strong>corporate extended <strong>Pt</strong> catalysts <strong>in</strong>to<br />
more traditional dispersed electrodes for mass<br />
transport/water management<br />
<strong>Dispersed</strong> (traditional) electrodes (~10 µm) have shown<br />
exceptional tolerance over wide ranges of operat<strong>in</strong>g conditions,<br />
<strong>in</strong>clud<strong>in</strong>g those relevant for transportation applications (hot/dry<br />
and cold/wet). To date, such structures have not been<br />
demostrated with extended <strong>Pt</strong> surfaces. Inherent electronic<br />
connectivity may help over come “particle-size” related effects.<br />
Ionomer <strong>in</strong>clusion <strong>in</strong> catalyst layer may help cold start.<br />
5
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