A reviewed vision of the oxygen reduction reaction mechanism on Pt-based catalysts

Author(s)

Gomez-Marin, Ana M. ^[1] ; Ticianelli, Edson A. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, Fis Quim, Caixa Postal 780, Ave Trabalhador Sao Carlense, BR-13560970 Sao Carlos, SP - Brazil

• Document type: Review article
• Source: CURRENT OPINION IN ELECTROCHEMISTRY; v. 9, p. 129-136, JUN 2018.
• Web of Science Citations: 6

Abstract

In this work, a short revised analysis regarding the ORR mechanism at Pt-based surfaces has been performed and some common kinetic criteria have been reexamined in light of recent experimental results. In this sense, the production of H2O2 under high mass transport conditions and the lack of reduction currents at potentials higher than the experimental reaction onset, E-onset(ORR), have been analyzed, considering the existence of a soluble intermediate species and an outer sphere reaction inside the ORR mechanism, besides the possible occurrence of a zero current cycle at E-onset(ORR). Finally, the implications of these findings in the stability and durability of Pt-based catalysts have been also discussed. (AU)

• FAPESP's process: 14/23486-9 - Development of nanostructured electrocatalysts for electro-oxygen reduction reaction: study of activity and stability
• Grantee: Ana Maria Gómez Marín
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion
• Grantee: Edson Antonio Ticianelli
• Support Opportunities: Research Projects - Thematic Grants