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Probing the structure of operating fuel cell cathode catalysts using XAS

Probing the structure of operating fuel cell cathode catalysts using XAS
Probing the structure of operating fuel cell cathode catalysts using XAS
A proton exchange membrane fuel cell has been designed to enable correlation of cathode catalytic activity with structural parameters determined by in situ XAS investigations in transmission mode. The cell design is described and validated for oxygen reduction activity measurement using both Pt and PtCo alloy catalysts. Findings from in situ XAS investigations at the Pt LIII edge are presented for a 60% Pt/C cathode catalyst operating at OCV, under load with oxygen feed, and during time resolved potential step experiments with oxygen and nitrogen feeds. In nitrogen XANES and EXAFS analysis show increasing oxide formation and particle disruption with increasing potential up to 1.0 V. In oxygen the catalyst structure remained unchanged irrespective of the applied potential and therefore load drawn from the cell. Differences in coordination number at the same applied potential in oxygen compared to nitrogen indicate that a particle morphology change occurs during the ORR.



1938-5862
1395-1404
Hudson, Sarah L.
5d6c5c25-1271-48ff-a5e0-8cb87d3bfd54
Ball, Sarah C.
08b43f03-eb51-4cf9-b228-2fc79c90b358
Blaney, Katie
df62bc06-6e0f-45b6-a02f-386fce53a446
Chouchelamane, Gael
22fc1870-2a8f-4751-811a-df6ef1f42b46
Fiddy, Steven G.
f6c255cf-6aa1-4798-85ca-1a2ccdaa1186
Harvey, Ian
c7d85326-0c7a-47b5-a50b-fd6bfebbe3cd
Sivasubramaniam, Prabalini
00cb8ce6-7c08-4245-a4e6-f1c651e3eaea
Tessier, Beatrice
b73d0909-197f-4c4e-b972-796ff5bde4da
Theobald, Brian R.
2ef6a418-8c2b-41ff-af24-ba46d879d778
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Hudson, Sarah L.
5d6c5c25-1271-48ff-a5e0-8cb87d3bfd54
Ball, Sarah C.
08b43f03-eb51-4cf9-b228-2fc79c90b358
Blaney, Katie
df62bc06-6e0f-45b6-a02f-386fce53a446
Chouchelamane, Gael
22fc1870-2a8f-4751-811a-df6ef1f42b46
Fiddy, Steven G.
f6c255cf-6aa1-4798-85ca-1a2ccdaa1186
Harvey, Ian
c7d85326-0c7a-47b5-a50b-fd6bfebbe3cd
Sivasubramaniam, Prabalini
00cb8ce6-7c08-4245-a4e6-f1c651e3eaea
Tessier, Beatrice
b73d0909-197f-4c4e-b972-796ff5bde4da
Theobald, Brian R.
2ef6a418-8c2b-41ff-af24-ba46d879d778
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169

Hudson, Sarah L., Ball, Sarah C., Blaney, Katie, Chouchelamane, Gael, Fiddy, Steven G., Harvey, Ian, Sivasubramaniam, Prabalini, Tessier, Beatrice, Theobald, Brian R., Thompsett, David and Russell, Andrea E. (1970) Probing the structure of operating fuel cell cathode catalysts using XAS. ECS Transactions, 16 (2), 1395-1404.

Record type: Article

Abstract

A proton exchange membrane fuel cell has been designed to enable correlation of cathode catalytic activity with structural parameters determined by in situ XAS investigations in transmission mode. The cell design is described and validated for oxygen reduction activity measurement using both Pt and PtCo alloy catalysts. Findings from in situ XAS investigations at the Pt LIII edge are presented for a 60% Pt/C cathode catalyst operating at OCV, under load with oxygen feed, and during time resolved potential step experiments with oxygen and nitrogen feeds. In nitrogen XANES and EXAFS analysis show increasing oxide formation and particle disruption with increasing potential up to 1.0 V. In oxygen the catalyst structure remained unchanged irrespective of the applied potential and therefore load drawn from the cell. Differences in coordination number at the same applied potential in oxygen compared to nitrogen indicate that a particle morphology change occurs during the ORR.



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Published date: 1 January 1970

Identifiers

Local EPrints ID: 146511
URI: http://eprints.soton.ac.uk/id/eprint/146511
ISSN: 1938-5862
PURE UUID: bf5fb7db-c871-47f0-aea3-dc9fe0d07d52
ORCID for Andrea E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

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Date deposited: 21 Apr 2010 12:31
Last modified: 06 Jun 2018 12:58

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Contributors

Author: Sarah L. Hudson
Author: Sarah C. Ball
Author: Katie Blaney
Author: Gael Chouchelamane
Author: Steven G. Fiddy
Author: Ian Harvey
Author: Prabalini Sivasubramaniam
Author: Beatrice Tessier
Author: Brian R. Theobald
Author: David Thompsett

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