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Oxygen Reduction Reaction on Au Revisited at Different pH Values using in situ Surface‐Enhanced Raman Spectroscopy
Author(s) -
Yu HaiYang,
Li XiaoFeng,
Zhang TianHeng,
Liu Jiao,
Tian JingHua,
Yang Ruizhi
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202000086
Subject(s) - electrolyte , raman spectroscopy , chemistry , electrochemistry , oxygen , inorganic chemistry , spectroscopy , electron transfer , in situ , raman scattering , oxygen reduction , electrode , analytical chemistry (journal) , photochemistry , organic chemistry , physics , optics , quantum mechanics
The mechanisms of the oxygen reduction reaction (ORR) on Au surfaces are revisited in electrolytes with different pH values by using a combination of electrochemical and in situ surface‐enhanced Raman scattering spectroscopy. Surprisingly, the in situ Raman signal of the O−O stretching vibration was detected during the ORR on a Au surface by using a λ =785 nm laser. Both the intermediate products O 2 − and H 2 O 2 could be detected, which indicates the difficulty of the further reduction H 2 O 2 and results in a lower electron transfer number, especially in neutral and acid electrolytes. The weak absorption ability of HO 2 on the Au surface may explain the poor ORR in neutral and acid electrolytes. This work not only provides a deep insight to understand the reduction mechanisms of O 2 on Au in electrolytes with different pH values but also supplies a new idea for the selection and optimization of electrolytes and efficient electrocatalysts for oxygen reduction.