Electrochemical reactions of mixed cobalt/nickel oxide hydroxides in alkaline electrolyte

Technical Report · Wed Jul 01 04:00:00 EDT 1987

OSTI ID:6885938

Zimmerman, A H; Johnson, V E

Thin films of mixed cobalt/nickel oxyhydroxides were electrodeposited on platinum substrates. The electrochemical reactions of these materials were characterized as a function of composition and potential in alkaline electrolytes. The materials formed by electrochemical reaction were also characterized structurally from X-ray diffraction powder data. Evidence is presented for several types of materials that are formed as the cobalt levels are increased in the oxyhydroxide. These materials range from solid-solution beta-nickel oxyhydroxide phases when the cobalt content is less than about 10 percent, to several mixed nickel/cobalt phases formed at intermediate cobalt concentrations, and finally above 90 percent cobalt to the doped cobalt oxyhydroxides. Materials formed at intermediate cobalt levels adopt nickel-rich structures below 50 percent cobalt and cobalt-rich structures above 50 percent cobalt. The nickel-rich and the cobalt-rich materials posses the electrochemical activity of nickel oxyhydroxides, although the cobalt-rich structure appears to have a charge storage capacity reduced approximately by a factor of 2.

• Research Organization: Aerospace Corp., El Segundo, CA (USA)
• OSTI ID: 6885938
• Report Number(s): ATR-86(9561)-4
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHEMISTRY
COBALT COMPOUNDS
COBALT HYDROXIDES
DEPOSITION
DIAGRAMS
ELECTRIC POTENTIAL
ELECTROCHEMISTRY
ELECTRODEPOSITION
ELECTROLYSIS
ELECTROLYTES
ELEMENTS
FILMS
HYDROGEN COMPOUNDS
HYDROXIDES
LYSIS
METALS
NICKEL COMPOUNDS
NICKEL HYDROXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PLATINUM
PLATINUM METALS
REACTIVITY
SURFACE COATING
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS