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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A novel electrochemical cell for operando X-ray absorption measurements at low energies: Probing electrochemically induced electronic changes in palladium

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Author(s):
Villullas, Hebe M. [1] ; Ometto, Felipe B. [1] ; Alvarenga, Gabriel M. [1] ; Vicentin, Flavio C. [2]
Total Authors: 4
Affiliation:
[1] Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil
[2] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Electrochemistry Communications; v. 94, p. 14-17, SEP 2018.
Web of Science Citations: 1
Abstract

Operando assessment of electronic properties near the Fermi level is essential to gain new insights into the mechanisms of electrochemical reactions as well as for the development of more efficient electrocatalysts. However, the high vacuum ambient needed for X-ray absorption measurements at low energies has made studies under electrochemical conditions quite challenging. Here, we describe an out-of-chamber setup with a new electrochemical cell that allowed us to performed operando X-ray absorption studies at the low energy of the Pd L3 edge. Using the new electrochemical cell, we were able to probe, for the first time, the changes in electronic properties of carbon-supported Pd nanoparticles induced by the electrochemical oxidation of the Pd surface. Our results demonstrate that the oxidation process produces an increase in the Pd 4d band vacancy, which indicates that charge is transferred from the metal to the adsorbed oxygenated species. (AU)

FAPESP's process: 14/12255-6 - Catalysis-nanostructure-properties relations: establishing basis for the design of multifunctional catalysts
Grantee:Hebe de las Mercedes Villullas
Support Opportunities: Regular Research Grants
FAPESP's process: 16/05041-5 - Studies of the influence of metal-support interaction on the mechanism of the ethanol oxidation reaction on Pd nanoparticles
Grantee:Gabriel Martins de Alvarenga
Support Opportunities: Scholarships in Brazil - Master