Journal Article

PUBDB-2019-00744

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Inhibitive effect of Pt on Pd-hydride formation of Pd@Pt core-shell electrocatalysts: An in situ EXAFS and XRD study

Wise, A. M. ; Richardson, P. W. ; Price, S. W. T. ; Chouchelamane, G. ; Calvillo, L. ; Hendra, P. J. ; Toney, M. F. ; Russell, A. (Corresponding author)Extern*

2018
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.electacta.2017.12.161  doi:10.3204/PUBDB-2019-00744

Abstract: n situ EXAFS and XRD have been used to study the electrochemical formation of hydride phases, H$_{abs}$, in 0.5 M H$_2$SO$_4$ 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 H$_2$ 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.

Note: © Elsevier Ltd.

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

Experiment(s):

1. DORIS Beamline X1 (DORIS III)

Appears in the scientific report 2018

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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