Electrochemical intercalation of oxygen in La[sub 2]NiO[sub 4+x] (O [le] x [le] 0. 145)

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Chemistry of Materials; (United States)

DOI:https://doi.org/10.1021/cm00036a003· OSTI ID:5077627

DiCarlo, J F; Yazdi, I; Bhavaraju, S; Jacobson, A J ^[1]

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1. Univ. of Houston, TX (United States)

A recent electrochemical study of the isostructural compound La[sub 2]NiO[sub 4+x] has shown that x values as high as 0.25 can be achieved. The experiments were carried out by oxidation at constant potential for different times in order to synthesize a series of discrete compositions. Open-circuit voltages emphasizing the higher compositions were reported, but no data were presented for the deintercalation of oxygen on reduction and the question of the reversibility of oxygen intercalation was not addressed. In the course of similar experiments, the author's have found that both oxidation and reduction of La[sub 2]NiO[sub 4-x] are rapid and highly reversible in the composition range 0 [le] x [le] 0.145. The electrochemical data obtained for La[sub 2]NiO[sub 4+x] have been used to define the phase diagram, determine the thermodynamics of oxygen intercalation and to estimate the oxygen chemical diffusion coefficient in the single phase region. 21 refs., 2 figs.

• OSTI ID: 5077627
• Journal Information: Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 5:12; ISSN CMATEX; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
CHALCOGENIDES
CHEMISTRY
DIAGRAMS
ELECTROCHEMISTRY
ELEMENTS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NICKEL COMPOUNDS
NICKEL OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE DIAGRAMS
RARE EARTH COMPOUNDS
STOICHIOMETRY
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS