ECS Transactions · 2014 · 16 citations · 0 references
Natural SciencesChemical EngineeringChemistryCatalysisElectrochemistryInorganic ChemistryCatalytic MaterialsCatalytic MechanismsCatalytic Reaction KineticsElectrochemical Energy ConversionElectrochemical KineticsElectrode KineticsCopper CatalysisCopper-catalyzed OxidationElectrocatalysis KineticsElectrocatalystsElectrocatalytic ReactorsMechanistic ElucidationOverall Reaction OrderTafel Analysis
The mechanistic aspects of the ORR catalyzed by a non-pyrolyzed Cu-based catalyst were studied using a previously reported in situ electrochemical-EPR cell. Measurements made at a series of different O 2 concentrations include calculation of Tafel slope and reaction order of O 2 and Cu species in the kinetic region. The Cu-species reaction orders reveal that Cu(I) is involved in the RDS in a 1:1 complex with O 2 and that Cu(II) reduced to Cu(I) is a fast step before the RDS.