Role of the interfacial water structure on electrocatalysis: Oxygen reduction on Pt(111) in methanesulfonic acid

•ORR was studied in methanesulfonic acid (MTSA) on Pt(111).•ORR activity in MTSA slightly decreases compared to the activity in HClO4.•Stronger liquid water structuring may decrease ORR activity. Most of electrocatalytic reactions occur in an aqueous environment. Understanding the influence of water...

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Bibliographic Details
Published inCatalysis today Vol. 262; pp. 95 - 99
Main Authors Sandoval-Rojas, Andrea P., Gómez-Marín, Ana M., Suárez-Herrera, Marco F., Climent, Víctor, Feliu, Juan M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.03.2016
Subjects
Hanging meniscus rotating disk voltammetry
Interfacial water
Methanesulfonic acid
Oxygen reduction
Pt surface
Oxygen reduction
Hanging meniscus rotating disk voltammetry
Methanesulfonic acid
Pt surface
Interfacial water
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Summary:•ORR was studied in methanesulfonic acid (MTSA) on Pt(111).•ORR activity in MTSA slightly decreases compared to the activity in HClO4.•Stronger liquid water structuring may decrease ORR activity. Most of electrocatalytic reactions occur in an aqueous environment. Understanding the influence of water structure on reaction dynamics is fundamental in electrocatalysis. In this work, the role of liquid water structure on the oxygen reduction at Pt(111) electrode is analyzed in methanesulfonic (MTSA) and perchloric acids. This is because these different anions can exert a different influence on liquid water structure. Results reveal a lower ORR electrode activity in MTSA than in HClO4 solutions and they are discussed in light of anion's influence on water structural ordering. From them, the existence of an outer-sphere, rate determining, step in the ORR mechanism is suggested.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2015.08.046