Fig. 4: Oxidizing corrosion of the polished Cu plates in different solutions. | Nature Communications

Fig. 4: Oxidizing corrosion of the polished Cu plates in different solutions.

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

Fig. 4

SEM images of Cu plates before a, and after 24 h oxidizing corrosions in b CO2-saturated KHCO3, c Ar-saturated KHCO3, d CO2-saturated KHCO3 containing VC, e Ar-saturated ultrapure water, and f Ar-saturated K2SO4 solutions. Correspondingly, the photographs are displayed in insets. g EPR spectra of the corresponding solutions containing 100 mM DMPO after 24 h resting. The concentrations of KHCO3, K2SO4, and VC are 0.5 M, 0.25 M, and 10 mM, respectively.

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