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Mechanisms of activity loss in PtCo alloy systems

Mechanisms of activity loss in PtCo alloy systems
Mechanisms of activity loss in PtCo alloy systems
The mechanism of activity loss in Pt and PtCo alloy systems has been investigated during 0.6 - 1.0 V and 0.6 - 1.2 V vs RHE cycling regimes using an electrochemical cell that allows electrochemical metal area (ECA) loss measurement and electrolyte sampling. Dissolution of platinum and base metal into the electrolyte was quantified using ICP-MS and TEM used to look for changes in catalyst morphology with cycles. ECA loss and base metal removal were found to be potential dependent. PtCo alloys were found to be more stable to ECA loss by Ostwald-ripening and dissolution than Pt. In terms of base metal loss the PtCo alloy was unstable and cycling was found to remove similar amounts of Co by dissolution as chemical acid leaching. Loss of Co from the surface layers of the catalyst was found to remove the enhanced stability and activity benefits of this catalyst making it more platinum like
1938-5862
1247-1257
Ball, Sarah C
f3718fcb-c28d-4661-8ad2-601ac631c47c
Hudson, Sarah L
5d6c5c25-1271-48ff-a5e0-8cb87d3bfd54
Hei Leung, Joe
5ce41f1d-bb9f-458d-afe3-e71be767fe7b
Russell, Andrea E
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f
Theobald, Brian R
cc6f4ab4-3dfe-42c1-932c-ab036de7cc7d
Ball, Sarah C
f3718fcb-c28d-4661-8ad2-601ac631c47c
Hudson, Sarah L
5d6c5c25-1271-48ff-a5e0-8cb87d3bfd54
Hei Leung, Joe
5ce41f1d-bb9f-458d-afe3-e71be767fe7b
Russell, Andrea E
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f
Theobald, Brian R
cc6f4ab4-3dfe-42c1-932c-ab036de7cc7d

Ball, Sarah C, Hudson, Sarah L, Hei Leung, Joe, Russell, Andrea E, Thompsett, David and Theobald, Brian R (2007) Mechanisms of activity loss in PtCo alloy systems. ECS Transactions, 11 (1), 1247-1257. (doi:10.1149/1.2781038).

Record type: Article

Abstract

The mechanism of activity loss in Pt and PtCo alloy systems has been investigated during 0.6 - 1.0 V and 0.6 - 1.2 V vs RHE cycling regimes using an electrochemical cell that allows electrochemical metal area (ECA) loss measurement and electrolyte sampling. Dissolution of platinum and base metal into the electrolyte was quantified using ICP-MS and TEM used to look for changes in catalyst morphology with cycles. ECA loss and base metal removal were found to be potential dependent. PtCo alloys were found to be more stable to ECA loss by Ostwald-ripening and dissolution than Pt. In terms of base metal loss the PtCo alloy was unstable and cycling was found to remove similar amounts of Co by dissolution as chemical acid leaching. Loss of Co from the surface layers of the catalyst was found to remove the enhanced stability and activity benefits of this catalyst making it more platinum like

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Published date: 7 October 2007

Identifiers

Local EPrints ID: 146513
URI: http://eprints.soton.ac.uk/id/eprint/146513
ISSN: 1938-5862
PURE UUID: 981e9eac-d2a9-41d6-b160-1fc41b1c03b3
ORCID for Andrea E Russell: ORCID iD orcid.org/0000-0002-8382-6443

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Date deposited: 21 Apr 2010 13:26
Last modified: 14 Mar 2024 02:41

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Contributors

Author: Sarah C Ball
Author: Sarah L Hudson
Author: Joe Hei Leung
Author: David Thompsett
Author: Brian R Theobald

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