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

Autor(es)

Villullas, Hebe M. ^[1] ; Ometto, Felipe B. ^[1] ; Alvarenga, Gabriel M. ^[1] ; Vicentin, Flavio C. ^[2]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Electrochemistry Communications; v. 94, p. 14-17, SEP 2018.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 14/12255-6 - Relações catálise-nanoestrutura-propriedades e estudos dos mecanismos de reação: estabelecendo bases para o desenho de catalisadores multifuncionais
• Beneficiário: Hebe de las Mercedes Villullas
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/05041-5 - Estudos da influência das interações metal-suporte no mecanismo da reação de oxidação de etanol em nanopartículas de Pd
• Beneficiário: Gabriel Martins de Alvarenga
• Modalidade de apoio: Bolsas no Brasil - Mestrado