Electrocatalyst supports influence activity and durability of metal nanocatalysts. In this investigation, platinum is bonded to composite carbon nanotubes covered with titania. They are constructed into working membrane electrode assemblies used in polymer electrolyte fuel cells. Composites were characterized and analyzed for benefit primarily in the anode. This electrode is subject to carbon monoxide from contamination of hydrogen and/or as intermediates in oxidation of organics. Tolerance to CO prevents reversible loss of performance which is recovered only by subjecting the electrode to corrosive conditions. Improving these propertes can be adjusted through modification of supports. This work demonstrates these advantageous modifications by comparing graphitic multi-wall carbon nanotubes against those functionalized with metal oxide. Establishing an ideal oxide defect chemistry with selected dopant atoms can enhance electronic conductivity and interaction. Operational cell measurements made by in-situ CO stripping   , electrochemical impedance spectroscopy   , hydrogen pump polarization, and corrosion tests show how a triple phase support structure can offer advantages.

Composite carbon nanotube and titania supports for resilent oxidation electrocatalysts in polymer electrolyte fuel cells

246th National Meeting (2013)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.