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

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

doi:10.1149/1.3055406

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

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

Materials Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

8 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 language	English (US)
Title of host publication	ECS Transactions - Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting
Publisher	Electrochemical Society Inc.
Pages	57-62
Number of pages	6
Edition	28
ISBN (Electronic)	9781566776882
ISBN (Print)	9781615672875
DOIs	https://doi.org/10.1149/1.3055406
State	Published - 2008
Event	Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting - Phoenix, AZ, United States Duration: May 18 2009 → May 23 2009

Publication series

Name	ECS Transactions
Number	28
Volume	13
ISSN (Print)	1938-5862
ISSN (Electronic)	1938-6737

Other

Other	Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting
Country/Territory	United States
City	Phoenix, AZ
Period	5/18/09 → 5/23/09

ASJC Scopus subject areas

General Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1149/1.3055406

Cite this

Louie, M. W., Sasaki, K., & Haile, S. M. (2008). Towards understanding electrocatalysis in CsH₂PO ₄-based fuel cells: Platinum and palladium thin film electrodes. In ECS Transactions - Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting (28 ed., pp. 57-62). (ECS Transactions; Vol. 13, No. 28). Electrochemical Society Inc.. https://doi.org/10.1149/1.3055406

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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.",

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Louie, MW, Sasaki, K & Haile, SM 2008, Towards understanding electrocatalysis in CsH₂PO ₄-based fuel cells: Platinum and palladium thin film electrodes. in ECS Transactions - Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting. 28 edn, ECS Transactions, no. 28, vol. 13, Electrochemical Society Inc., pp. 57-62, Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting, Phoenix, AZ, United States, 5/18/09. https://doi.org/10.1149/1.3055406

Towards understanding electrocatalysis in CsH₂PO ₄-based fuel cells: Platinum and palladium thin film electrodes. / Louie, M. W.; Sasaki, K.; Haile, S. M.
ECS Transactions - Proton Transfer and Transport in Fuel Cells - 213th ECS Meeting. 28. ed. Electrochemical Society Inc., 2008. p. 57-62 (ECS Transactions; Vol. 13, No. 28).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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N2 - 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.

AB - 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.

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