Highly active Ag/C nanoparticles containing ultra-low quantities of sub-surface Pt for the electrooxidation of glycerol in alkaline media

Author(s)

Lima, Carlos C. ^[1] ; Rodrigues, Marta V. F. ^[1] ; Neto, Antonio F. M. ^[1] ; Zanata, Cinthia R. ^[2] ; Pires, Cleo T. G. V. M. T. ^[1] ; Costa, Luelc S. ^{[1, 3]} ; Solla-Gullon, Jose ^[4] ; Fernandez, Pablo S. ^{[1, 3]}

Affiliation

^[1] States Univ Campinas, Inst Chem, UNICAMP, BR-13083970 Campinas, SP - Brazil

^[2] Fed Univ Mato Grosso do Sul UFMS, Inst Chem, BR-79074460 Campo Grande, MS - Brazil

^[3] Ctr Innovat New Energies CINE, BR-13083841 Campinas, SP - Brazil

^[4] Univ Alicante, Inst Electrochem, Apdo 99, E-03080 Alicante - Spain

• Document type: Journal article
• Source: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 279, DEC 15 2020.
• Web of Science Citations: 0

Abstract

The practical application of Pt-based technologies depends on the lowering in the costs and one way to face this challenge is by reducing the amount of Pt. Herein, we decorate Ag nanoparticles with ultra-small (0.8 %) quantities of Pt and test them for the electrooxidation of glycerol. We showed that the Pt atoms of our catalyst are one order of magnitude more active (in terms of mass activity) than Pt/C commercial catalyst. By performing in situ FTIR measurements, electrolysis experiments and HPLC analysis, we showed that both catalysts form mainly glycerate and lactate, but Pt/C is more prone to poisoning and to form carbonate. We suggest that this different behavior is attributed to the high dispersion of the Pt atoms on Ag nanoparticles. The lower probability of finding neighboring Pt atoms diminishes the formation of multiple bonded intermediates, which are precursors for the formation of carbonate and some poisoning intermediates. (AU)

• FAPESP's process: 16/01365-0 - Glycerol electro-oxidation on metallic nanoparticles with interest in basic as well as in applied science. Simultaneous production of energy and fine chemicals
• Grantee: Pablo Sebastián Fernández
• Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
• FAPESP's process: 17/11986-5 - Research Division 1 - dense energy carriers
• Grantee: Ana Flávia Nogueira
• Support type: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 18/20952-0 - Applied and fundamental studies of the electrochemical conversion of alcohols and CO2
• Grantee: Pablo Sebastián Fernández
• Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants