Hydroxyl radicals dominate reoxidation of oxide-derived Cu in electrochemical CO₂ reduction.

ABSTRACT: Cu^δ+ sites on the surface of oxide-derived copper (OD-Cu) are of vital importance in electrochemical CO₂ reduction reaction (CO₂RR). However, the underlying reason for the dynamically existing Cu^δ+ species, although thermodynamically unstable under reductive CO₂RR conditions, remains uncovered. Here, by using electron paramagnetic resonance, we identify the highly oxidative hydroxyl radicals (OH^•) formed at room temperature in HCO₃^- solutions. In combination with in situ Raman spectroscopy, secondary ion mass spectrometry, and isotope-labelling, we demonstrate a dynamic reduction/reoxidation behavior at the surface of OD-Cu and reveal that the fast oxygen exchange between HCO₃^- and

SUBMITTER: Mu S 

PROVIDER: S-EPMC9237086 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature