Fig. 3. In situ Raman and EC-AFM analysis of CoOOH NS and NR.
a Raman spectra under applied potentials ranging from 1.03 to 1.73 V vs. RHE (from bottom to top, with the interval of 0.1 V); b AFM images and c corresponding height of NS under applied potentials ranging from 1.03 to 1.73 V vs. RHE. The corresponding CV curve was also shown in (c). AFM measurement was interfered with by the evolving bubbles at potentials higher than 1.53 V vs. RHE. Source data are provided as a Source Data file.