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In Situ XAFS Study of Oxides Formed on Nickel Thin Film Electrodes in KOH Solution.
NAVAL SURFACE WARFARE CENTER SILVER SPRING MD
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The composition and structure of the oxides formed on nickel are of great interest for a number of technological applications, e.g., batteries and corrosion. In spite of the considerable research that has been done, there is still much uncertainty as to the stoichiometry and structure of the various oxides hydroxides that are formed during the anodic oxidation of the nickel. This is due largely to the highly disordered or amorphous nature of the phases formed which makes structural determination by X-ray diffraction difficult. X-ray absorption Fine Structure XAFS spectroscopy is an excellent technique for the characterization of such materials which have no long range order. In this paper, we present initial results of an in situ study of the structure and composition of the oxides hydroxides formed on Ni thin film electrodes in 5M KOH solution as a function of the applied potential.
APPROVED FOR PUBLIC RELEASE