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In Situ Spectroscopy Study of Oxygen Reduction Reaction Intermediates at the Pt/Acid Interface: Surface-Enhanced Infrared Absorbance Spectroscopy
journal contribution
posted on 2020-03-20, 13:36 authored by Suresh Kukunuri, Hidenori NoguchiIncreasing
demands for the development of efficient electrochemical
energy systems such as fuel cells and metal–air batteries have
stimulated research interests in investigating the mechanistic pathway
of the oxygen reduction reaction (ORR) at the catalyst surface, having
direct relevance to these systems. Although past years have witnessed
few efforts toward illustrating the mechanistic pathway of the ORR
under various pH conditions, the chemical nature of intermediates
generated under the acidic conditions still remains a challenge. In
the present study, the detection of possible intermediate species
formed at the Pt/HClO4 interface is endeavored using in
situ surface-enhanced infrared absorbance spectroscopy (SEIRAS). This
is achieved using a simple electrode configuration with polycrystalline
Pt deposited on the roughened surface of an Au-coated ZnSe prism to
avoid the IR absorbance of the prism. Potential-dependent SEIRAS measurements
demonstrate the formation of superoxide anion species at the Pt surface.
Spectral analysis under O-isotope (18O2) and
D2O conditions corroborate the detection of superoxide
species. A systematic study of the ORR intermediates and their surface
coverage paves a way for efficient catalyst design.
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D 2 O conditionsIR absorbanceacidic conditionschemical natureOxygen Reduction Reaction Intermediatessurface coveragesuperoxide speciesresearch interestsdetectionAu-coated ZnSe prismabsorbance spectroscopyAbsorbance Spectroscopyoxygen reduction reactionfuel cellssuperoxide anion speciesSpectral analysisSitu Spectroscopy Studycatalyst designPt surfacecatalyst surface18 O 2ORR intermediateselectrode configurationelectrochemical energy systemspathwayPotential-dependent SEIRAS measurementspH conditions
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