Towards understanding electrocatalysis in CsH2PO 4-based fuel cells: Platinum and palladium thin film electrodes

M. W. Louie, K. Sasaki, S. M. Haile

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

Fuel cells based on CsH2PO4 electrolytes have demonstrated promising power densities, but the kinetics of electrode reactions remain largely uncharacterized. Here, the hydrogen oxidation kinetics of Pd and Pt thin film electrodes on CsH2PO4 are probed using A.C. impedance spectroscopy under humidified H2/Ar gas mixtures. It was found that the polarization resistance of the Pd electrode is approximately ten times smaller than that of the Pt electrode. Furthermore, the electrode polarization resistances for both the Pd | CsH2PO4| Pd and Pt | CsH2PO4| Pt systems increase significantly on cooling through the superprotonic phase transition, suggesting that the rate-limiting processes for hydrogen oxidation are closely tied to proton dynamics in the CsH2PO4 electrolyte.

Original languageEnglish (US)
Title of host publicationECS Transactions - Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting
Pages57-62
Number of pages6
Edition28
DOIs
StatePublished - Dec 1 2008
EventProton Transfer and Transport in Fuel Cells - 213th ECS Meeting - Phoenix, AZ, United States
Duration: May 18 2009May 23 2009

Publication series

NameECS Transactions
Number28
Volume13
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherProton Transfer and Transport in Fuel Cells - 213th ECS Meeting
CountryUnited States
CityPhoenix, AZ
Period5/18/095/23/09

ASJC Scopus subject areas

  • Engineering(all)

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