Fig. 3. Potential-dependent SHINER spectra on Cu MPs at different electrolyte pH.

SHINER spectra on Cu MPs in a 0.3 M NaH₂PO₄ + 0.35 M Na₂HPO₄ (pH 7.2); b 0.1 M NaOH + 0.9 M NaClO₄ (pH 12.9) at potentials indicated in the figure. The spectra were collected at constant potentials with 0.1 V vs. SHE intervals in the cathodic direction from the OCP to −1.3 V vs. SHE and c SHINER spectra on Cu MPs at −0.8 V vs. SHE in the electrolytes switching from 12.9 to 7.2.