We apply a special form of ellipsometry, oblique incidence optical reflectivity difference (OI-RD), which is optimized to detect changes at a surface, to Co electrodeposition on polycrystalline Au. The OI-RD signal shown to be proportional to Co thickness and thus enables the separation of the Co deposition and H2 evolution partial currents. Competition between the two processes gives rise to interesting effects, including the observation of a peak in the Co partial current during both the anodic and cathodic sweeps of a cyclic voltammogram taken after repeated cycles of Co deposition and dissolution.
ASJC Scopus subject areas
- Materials Science(all)