Bi-modified Pt Electrodes toward Glycerol Electrooxidation in Alkaline Solution: Effects on Activity and Selectivity

Autor(es)

de Souza, Matheus B. C. ^[1] ; Vicente, Rafael A. ^[1] ; Yukuhiro, Victor Y. ^[1] ; Pires, Cleo T. G. V. M. T. ^[1] ; Cheuquepan, William ^[2] ; Bott-Neto, Jose L. ^[1] ; Solla-Gullon, Jose ^[2] ; Fernandez, Pablo S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Chem Inst, POB 6154, BR-13083970 Campinas, SP - Brazil

^[2] Univ Alicante, Inst Electroquim, Apartado 99, E-03080 Alicante - Spain

• Tipo de documento: Artigo Científico
• Fonte: ACS CATALYSIS; v. 9, n. 6, p. 5104-5110, JUN 2019.
• Citações Web of Science: 3

Resumo

Herein we investigate the effect of irreversibly adsorbed bismuth on polycrystalline platinum (Pt-p) on the electrooxidation of glycerol in alkaline media by combining electrochemical, spectroscopic (in situ FTIR), and analytical (HPLC on line) techniques. We found that the activity of Pt-p increases by about 5-fold when the optimal quantity of Bi ions is added to the solution. Besides, the adatom strongly impacts the reaction products by suppressing the pathways with C-C bond breaking, hindering the formation of CO (and other unknown intermediates) and enhancing the production of glycerate. Different from the results in acid media for Pt-p-Bi systems where Bi blocks the oxidation pathway through the primary carbon, glycerate is the main product in alkaline media, and dihydroxyacetone is either produced in extremely low quantities or not produced. Besides, comparing our results with those in acid media, the peak current recorded at 1 mV.s(-1) in this work was 1 order of magnitude higher. These results show the strong impact of the pH in the reaction rate and selectivity. (AU)

• Processo FAPESP: 16/01365-0 - Eletro-oxidação de glicerol sobre nanopartículas metálicas com interesse em ciência básica e aplicada. Coprodução de energia e de compostos de alto valor econômico
• Beneficiário: Pablo Sebastián Fernández
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular