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Electrochemical characterization of the three Co3O4 catalysts. (a) LSV curves, (b) Tafel plots, and (c) chronopotentiometry curves. (d) Cobalt dissolution during the stability test as monitored using ICP-MS. (e) Changes in the Co3+/Co2+ ratio as measured by XPS. (f) Changes in Co3+/Co2+ as measured by in situ Raman. (g, h) In situ Raman spectra under applied potentials of the h-Co3O4, c-Co3O4, and o-Co3O4.
