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SERS study of hydrogen peroxide electroreduction on a Pb‐modified Au electrode
Author(s) -
Li Xiao,
Gewirth Andrew A.
Publication year - 2005
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1339
Subject(s) - hydrogen peroxide , chemistry , bimetallic strip , peroxide , raman spectroscopy , catalysis , inorganic chemistry , electrode , electrochemistry , surface enhanced raman spectroscopy , raman scattering , organic chemistry , optics , physics
Abstract The mechanism of the electroreduction of H 2 O 2 on a Pb‐modified Au surface was examined by surface‐enhanced Raman spectroscopy. The measurements show the presence of lead peroxide, PbOOH + , with the maximum intensity at potential just positive of underpotentially deposited Pb, and bimetallic dihydroxide, AuPb(OH) 2 , at potential just positive of that where peroxide is reduced and Pb islands maximally formed on the surface. All the modes for these two species decay rapidly and even disappear as the reduction current flows. Both species are absent in solutions not containing either Pb 2+ or H 2 O 2 . The edge of Pb islands on the Au surface is thus shown to be the active site for this catalysis process. These results further underscore the important role of MOH species in the peroxide electroreduction reaction. Copyright © 2005 John Wiley & Sons, Ltd.