Cobalt/Cobalt Oxide Surface for Water Oxidation

Water splitting to produce molecular hydrogen is an essential method to store sustainable energies. One of the bottlenecks for water splitting is the availability of an efficient and stable water-oxidizing catalyst. Herein, metallic cobalt foil, after the treatment under high potential (10–60.0 V), was used for water oxidation. The cobalt/cobalt oxide surface was characterized by various spectroscopic, microscopy, X-ray diffraction, and electrochemical methods. Diffuse reflectance infrared Fourier transform spectroscopy showed peaks for Co oxide at 489 and 595 cm–1 attributed to the stretching of Co–O and bending of O–Co–O bonds in the CoO6 octahedra. Small aggregated particles (ca. 50–100 nm) with a spherical morphology were detected by scanning electron microscopy, and high-resolution transmission electron microscopy from the mechanically separated particles indicated spacings of 2.5–2.6 A corresponding to the interplanar spacings of the (011) plane for Co3O4. Selected area (electron) diffraction showed...

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