X-ray absorption fine structure spectra and the oxidation state of nickel in some of its oxycompounds

The structure of the higher oxide forms of nickel (where Ni has a valency greater than +2) is interesting from the standpoint of developing advanced nickel batteries for consumer applications and for electric vehicle propulsion. Xanes spectra of nickel K-edge and X-ray diffraction patterns of severa...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 1994-06, Vol.141 (6), p.L69-L71
Main Authors: MANSOUR, A. N, MELENDRES, C. A, PANKUCH, M, BRIZZOLARA, R. A
Format: Article
Language:English
Subjects:
250903 - Energy Storage- Batteries- Materials, Components, & Auxiliaries
360105 - Metals & Alloys- Corrosion & Erosion
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
Condensed matter: structure, mechanical and thermal properties
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
ENERGY STORAGE
Exact sciences and technology
Inorganic compounds
MATERIALS SCIENCE
METALS
NICKEL
NICKEL COMPOUNDS
NICKEL OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
Physics
SPECTROSCOPY
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VALENCE
Water, oxides, hydroxides, peroxides
X-ray absorption spectroscopy: exafs, nexafs, xanes, etc
X-ray diffraction and scattering
X-RAY SPECTROSCOPY
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Summary:The structure of the higher oxide forms of nickel (where Ni has a valency greater than +2) is interesting from the standpoint of developing advanced nickel batteries for consumer applications and for electric vehicle propulsion. Xanes spectra of nickel K-edge and X-ray diffraction patterns of several nickel oxycompounds were measured. The shift in energy of the Ni K-absorption edge toward higher values correlates well with the increase in the oxidation state of nickel from +2 to +4 in the compounds studied. The inflection point energy of the Ni pre-edge structure shifts approximately 1 eV per unit change in valency. The results provide evidence which support the assignment that the valency of Ni in [beta]-NiOOH is +3; Ni[sub 3]O[sub 2](OH)[sub 4] and commercial nickel peroxide (NiO[sub 2]) likewise contain trivalent nickel. The edge shift for quadrivalent nickel in KNilO[sub 6] is reported for the first time.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.2054990