Electronic structure of NiCo2O4 by XANES, EXAFS and 61Ni Mössbauer studies

Lenglet, M.; Guillamet, R.; Dürr, J.; Gryffroy, D.; Vandenberghe, R. E.

doi:10.1016/0038-1098(90)90705-g

Cited by 69 publications

(37 citation statements)

References 11 publications

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“…In its bulk form, NiCo 2 O 4 has been characterized by X-ray diffraction [7], neutron diffraction [7], Mössbauer spectroscopy [35], EXAFS [35], and XANES [35]. While nominally classifi ed as an inverse spinel, variations in site occupancy have been proposed and the bulk magnetic properties have been interpreted as more in line with a distribution of site occupancies given by C o δ…”

Section: Discussionmentioning

confidence: 99%

Surface composition of CoxNi1−xO solid solutions by X-ray photoelectron and Auger spectroscopies

Nydegger

Couderc

Langell

1999

Applied Surface Science

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Section: Discussionmentioning

confidence: 99%

Surface composition of CoxNi1−xO solid solutions by X-ray photoelectron and Auger spectroscopies

Nydegger

Couderc

Langell

1999

Applied Surface Science

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“…Figure 1 exhibits the crystallographic structure of NiCo 2 O 4 , in which nickel occupies the octahedral sites and cobalt is distributed over both octahedral and tetrahedral sites. [1][2][3] The structural formula of NiCo 2 O 4 has been interpreted comprehensively. King and co-workers proposed the structural formula of NiCo 2 4 .…”

Section: Introductionmentioning

confidence: 99%

Nickel Cobaltite Nanostructures for Photoelectric and Catalytic Applications

Liu

et al. 2015

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134

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Bimetallic oxide nickel cobaltite (NiCo2 O4 ) shows extensive potential for innovative photoelectronic and energetic materials owing to their distinctive physical and chemical properties. In this review, representative fabrications and applications of NiCo2 O4 nanostructures are outlined for photoelectronic conversion, catalysis, and energy storage, aiming to promote the development of NiCo2 O4 nanomaterials in these fields through an analysis and comparison of their diverse nanostructures. Firstly, a brief introduction of the spinel structures, properties, and morphologies of NiCo2 O4 nanomaterials are presented. Then, the advanced progress of NiCo2 O4 nanomaterials for both photoelectronic conversion and energy fields is summarized including such examples as solar cells, electrocatalysis, and lithium ion batteries. Finally, further prospects and promising developments of NiCo2 O4 nanomaterials in these significant fields are proposed.

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“…[16][17][18][19]. The present study represents a significant advance because it is the only one to present XANES comparisons with reference oxides other than NiO and CoO, and to present 5 combined, simultaneous fitting of both Ni and Co K-edges of EXAFS.…”

Section: Introductionmentioning

confidence: 99%

Cation distribution and vacancies in nickel cobaltite

Loche

Marras

Carta

et al. 2017

Phys. Chem. Chem. Phys.

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Samples of nickel cobaltite, a mixed oxide occurring in the spinel structure which is currently extensively investigated because of its prospective application as ferromagnetic, electrocatalytic, and cost-effective energy storage material were prepared in the form of nanocrystals stabilized in a highly porous silica aerogel and as unsupported nanoparticles.Nickel cobaltite nanocrystals with average size 4 nm are successfully grown for the first time into the silica aerogel provided that a controlled oxidation of the metal precursor phases is carried out, consisting in a reduction under H2 flow followed by mild oxidation in air. The investigation of the average oxidation state of the cations and of their distribution between the sites within the spinel structure, which is commonly described assuming the Ni cations are 2 only located in the octahedral sites, has been carried out by X-ray Absorption Spectroscopy providing evidence for the first time that the unsupported nickel cobaltite sample has a Ni:Co molar ratio higher than the nominal ratio of 1:2 and a larger than expected average overall oxidation state of the cobalt and nickel cations. This is achieved retaining the spinel structure, which accommodates vacancies to counterbalance the variation in oxidation state.3

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Electronic structure of NiCo2O4 by XANES, EXAFS and 61Ni Mössbauer studies

Cited by 69 publications

References 11 publications

Surface composition of CoxNi1−xO solid solutions by X-ray photoelectron and Auger spectroscopies

Surface composition of CoxNi1−xO solid solutions by X-ray photoelectron and Auger spectroscopies

Nickel Cobaltite Nanostructures for Photoelectric and Catalytic Applications

Cation distribution and vacancies in nickel cobaltite

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