The role of sodium surface species on electrochemical promotion of catalysis in a Pt/YSZ system: The case of ethylene oxidation.

Highlights: [•] Sodium added on Pt/YSZ system affects catalytic and electrocatalytic properties. [•] Proposed model considers work-function changes by promoter species independently. [•] High Na coverage causes interaction among promoter species and reaction components. [•] Reaction changes from electrophilic to volcano and electrophobic at high Na coverage. [ABSTRACT FROM AUTHOR]