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Inhibitive effect of Pt on Pd-hydride formation of Pd@Pt core-shell electrocatalysts: An in situ EXAFS and XRD study

Inhibitive effect of Pt on Pd-hydride formation of Pd@Pt core-shell electrocatalysts: An in situ EXAFS and XRD study
Inhibitive effect of Pt on Pd-hydride formation of Pd@Pt core-shell electrocatalysts: An in situ EXAFS and XRD study
In situ EXAFS and XRD have been used to study the electrochemical formation of hydride phases, Habs, in 0.5 M H2SO4 for a Pd/C catalyst and a series of Pd@Pt core-shell catalysts with varying Pt shell thickness, from 0.5 to 4 monolayers. Based on the XRD data a 3% lattice expansion is observed for the Pd/C core catalyst upon hydride formation at 0.0 V. In contrast, the expansion was ≤0.6% for all of the core-shell catalysts. The limited extent of the lattice expansion observed suggests that hydride formation, which may occur during periodic active surface area measurements conducting during accelerated aging tests or driven by H2 crossover in PEM fuel cells, is unlikely to contribute significantly to the degradation of Pd@Pt core-shell electrocatalysts in contrast to the effects of oxide formation.
electrocatalyst, EXAFS, XRD, Core-shell
0013-4686
27-38
Wise, Anna
41f9a2f9-cafb-4cf6-8ca7-ba20f1ff25fb
Richardson, Peter W
babd5d43-0ea3-4a27-b92f-820683acd781
Price, Stephen
5d3310d0-cf30-45e6-ba44-4bf87ade3b8d
Chouchelamane, Gael, Henri
c612bc85-9ee8-4fb4-a15b-59e58d861b6f
Calvillo lamana, Laura
7f216bd3-43f0-430a-82e0-cb51146d63ee
Hendra, P.J.
c38c1fd1-6a9f-431d-a8ea-ac9961f4acbb
Toney, Michael F.
2afadeb0-01a9-4c05-a8d0-74a75adbfef3
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Wise, Anna
41f9a2f9-cafb-4cf6-8ca7-ba20f1ff25fb
Richardson, Peter W
babd5d43-0ea3-4a27-b92f-820683acd781
Price, Stephen
5d3310d0-cf30-45e6-ba44-4bf87ade3b8d
Chouchelamane, Gael, Henri
c612bc85-9ee8-4fb4-a15b-59e58d861b6f
Calvillo lamana, Laura
7f216bd3-43f0-430a-82e0-cb51146d63ee
Hendra, P.J.
c38c1fd1-6a9f-431d-a8ea-ac9961f4acbb
Toney, Michael F.
2afadeb0-01a9-4c05-a8d0-74a75adbfef3
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169

Wise, Anna, Richardson, Peter W, Price, Stephen, Chouchelamane, Gael, Henri, Calvillo lamana, Laura, Hendra, P.J., Toney, Michael F. and Russell, Andrea E. (2017) Inhibitive effect of Pt on Pd-hydride formation of Pd@Pt core-shell electrocatalysts: An in situ EXAFS and XRD study. Electrochimica Acta, 262, 27-38. (doi:10.1016/j.electacta.2017.12.161).

Record type: Article

Abstract

In situ EXAFS and XRD have been used to study the electrochemical formation of hydride phases, Habs, in 0.5 M H2SO4 for a Pd/C catalyst and a series of Pd@Pt core-shell catalysts with varying Pt shell thickness, from 0.5 to 4 monolayers. Based on the XRD data a 3% lattice expansion is observed for the Pd/C core catalyst upon hydride formation at 0.0 V. In contrast, the expansion was ≤0.6% for all of the core-shell catalysts. The limited extent of the lattice expansion observed suggests that hydride formation, which may occur during periodic active surface area measurements conducting during accelerated aging tests or driven by H2 crossover in PEM fuel cells, is unlikely to contribute significantly to the degradation of Pd@Pt core-shell electrocatalysts in contrast to the effects of oxide formation.

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hydride paper revised_nov2017v3 - Accepted Manuscript
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Accepted/In Press date: 26 December 2017
e-pub ahead of print date: 27 December 2017
Keywords: electrocatalyst, EXAFS, XRD, Core-shell

Identifiers

Local EPrints ID: 416883
URI: http://eprints.soton.ac.uk/id/eprint/416883
ISSN: 0013-4686
PURE UUID: 6009c518-e80d-4012-84e8-4d2cbf634c49
ORCID for Andrea E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

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Date deposited: 12 Jan 2018 17:30
Last modified: 15 Sep 2021 05:07

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Contributors

Author: Anna Wise
Author: Peter W Richardson
Author: Stephen Price
Author: Gael, Henri Chouchelamane
Author: Laura Calvillo lamana
Author: P.J. Hendra
Author: Michael F. Toney

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