Fig. 5: Relationships between HCO3− concentration, OH• radical amount, and reoxidation dynamics of OD-Cu electrodes.
From: Hydroxyl radicals dominate reoxidation of oxide-derived Cu in electrochemical CO2 reduction
a The acquired EPR spectra in different HCO3− concentrations. Each solution contains 100 mM DMPO. b Correspondingly, the normalized intensity of DMPO-OH versus HCO3− concentration. The intensity was normalized by that of 0.1 M HCO3−. The gray lines guide the trends of DMPO-OH intensity without the compensation of K+. The error bars represent the standard deviation. c–e Raman spectra of OD-Cu reoxidation in different KHCO3 concentrations at OCP after reduction at −0.3 VRHE.
