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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

DOI: 10.1016/j.electacta.2017.12.161 DOI Help

Authors: Anna M. Wise (University of Southampton; Stanford Synchrotron Radiation Lightsource) , Peter W. Richardson (University of Southampton) , Stephen W. T. Price (University of Southampton; Diamond Light Source) , Gaël Chouchelamane (University of Southampton) , Laura Calvillo (University of Southampton) , Patrick J. Hendra (University of Southampton; Ventacon UK) , Michael F. Toney (Stanford Synchrotron Radiation Lightsource) , Andrea E. Russell (University of Southampton)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Electrochimica Acta , VOL 262 , PAGES 27 - 38

State: Published (Approved)
Published: February 2018
Diamond Proposal Number(s): 6350 , 6535

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.

Journal Keywords: Electrocatalyst; EXAFS; XRD; Core-shell

Subject Areas: Chemistry, Energy

Instruments: B18-Core EXAFS

Other Facilities: National Synchrotron Light Source

Added On: 05/01/2018 09:13

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