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Hydride phase formation in carbon supported palladium nanoparticle electrodes investigated using in situ EXAFS and XRD

Rose, Abigail; Maniguet, Stephanie; Mathew, Rebecca J.; Slater, Claire; Yao, Jun; Russell, Andrea E.

Authors

Abigail Rose

Stephanie Maniguet

Rebecca J. Mathew

Claire Slater

Dr Jun Yao Jun.Yao@uwe.ac.uk
Senior Lecturer Aerospace Themofluids

Andrea E. Russell



Abstract

In situ EXAFS (extended X-ray absorption fine structure), in situ XRD (X-ray diffraction) and electrochemical studies have been used to investigate the palladium hydride phases of carbon supported palladium nanoparticles as a function of applied potential. Electrochemical investigations showed an increase in the hydrogen to palladium ratio with an increasingly negative potential. The H/Pd ratio could be divided into four distinct regions, which described the palladium hydride phase present; the α-phase, a mixture of the α- and β-phases, the β-phase, and a hyperstoichiometric region. The β-hydride phase stoichiometry obtained from the electrochemical data corresponded to PdH. However, the composition obtained from the lattice expansions observed from the in situ EXAFS and XRD, 3.3% and 3.8%, correspond to compositions of PdH to PdH . The excess hydrogen and hyperstoichiometric amounts found at more negative potentials are attributed to either spillover on to the carbon support or trapping and subsequent reoxidation of H in the porous electrode structure. 0.59 0.68 2

Citation

Rose, A., Maniguet, S., Mathew, R. J., Slater, C., Yao, J., & Russell, A. E. (2003). Hydride phase formation in carbon supported palladium nanoparticle electrodes investigated using in situ EXAFS and XRD. Physical Chemistry Chemical Physics, 5(15), 3220-3225. https://doi.org/10.1039/b302956e

Journal Article Type Article
Publication Date 2003
Deposit Date Apr 17, 2021
Journal Physical Chemistry Chemical Physics
Print ISSN 1463-9076
Electronic ISSN 1463-9084
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 5
Issue 15
Pages 3220-3225
DOI https://doi.org/10.1039/b302956e
Public URL https://uwe-repository.worktribe.com/output/7268281