452329 Particle Atomic Layer Deposition for Synthesis of Fuel Cell Catalytic Material

Tuesday, November 15, 2016: 4:45 PM
Golden Gate (Hotel Nikko San Francisco)
William McNeary IV1, Alia M. Lubers2, Megan Maguire3, Daryl Ludlow4, Austin Drake2, Matthias Faust5, Martin Seipenbusch5 and Alan W. Weimer6, (1)Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO, (2)Chemical and Biological Engineering, University of Colorado at Boulder, Boulder, CO, (3)Chemical and Biological Engineering, University of Colorado, Boulder, CO, (4)Ludlow Electrochemical Hardware, Rensselaer, NY, (5)Institut für Mechanische Verfahrenstechnik und Mechanik, Universität Karlsruhe, Karlsruhe, Germany, (6)Chemical & Biological Engineering, University of Colorado at Boulder, Boulder, CO

Fluidized bed Atomic Layer Deposition (ALD) is a scalable method for nanoscale catalyst design, and has potential to address many of the persistent material challenges associated with PEM fuel cells, namely utilization and durability of the platinum catalyst. ALD was carried out to deposit platinum nanoparticles on functionalized and unmodified carbon black with both combustion and hydrogenation chemistries. Reactions throughout the ALD cycle were monitored using mass spectrometry and IR spectroscopy to clarify the deposition chemistry. The synthesized materials were evaluated in hydrogen pumping tests and as oxygen reduction reaction (ORR) catalysts in proton exchange membrane fuel cell experiments. Hydrogenation made finer, more dispersed Pt nanoparticles that performed similarly to their commercial equivalent when pumping hydrogen; oxygenation made a coarser catalyst that underperformed commercial Pt/C. The hydrogenation catalysts deposited on functionalized carbon were found to be ineffective in ORR testing due to poor water management in the fuel cell, which was attributed to reduced hydrophobicity within the catalyst layer.

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