Promotional Effect of Ag on the Catalytic Activity of Au for Glycerol Electrooxidation in Alkaline Medium

Autor(es)

Garcia, Amanda C. ^[1] ; Caliman, Julia ^[2] ; Ferreira, Eduardo B. ^[1] ; Tremiliosi-Filho, Germano ^[1] ; Linares, Jose J. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Qum Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Brasilia, Inst Quim, BR-70910900 Brasilia, DF - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CHEMELECTROCHEM; v. 2, n. 7, p. 1036-1041, JUL 15 2015.
• Citações Web of Science: 10

Resumo

The potential of silver as an auxiliary metal for gold in the electrochemical oxidation of glycerol in alkaline medium is studied. Three bimetallic materials (Au3Ag/C, AuAg/C, and AuAg3/C) and the corresponding monometallic reference materials (Au/C and Ag/C) are prepared by chemical reduction of their precursors with glycerol. Half-cell measurements evidence the beneficial effect of Ag on the electrocatalytic activity of Au for glycerol oxidation owing to decreased onset potential and higher current density in chronoamperometry, with an optimum formulation of AuAg/C. These results are confirmed by the single-cell performance of AuAg/C, which, despite having half the Au loading, has a higher open-circuit voltage than Au/C and a similar maximum power density. The results are correlated with the structural and electronic features of these materials, which are widely discussed in other works. (AU)

• Processo FAPESP: 12/10856-7 - Investigação do mecanismo de eletro-oxidação do glicerol em nanopartículas metálicas
• Beneficiário: Amanda Cristina Garcia
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/05627-9 - Síntese de nanopartículas de ouro usando glicerol como redutor em meio alcalino: estudo das variáveis de síntese e aplicação na oxidação de etanol
• Beneficiário: Eduardo de Barros Ferreira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica