Cobalt ferrite thin films as anode material for lithium ion batteries

Chu, Yanqiu; Fu, Zheng‐Wen; Qin, Qi‐Zong

doi:10.1016/j.electacta.2004.06.012

Cited by 168 publications

(79 citation statements)

References 21 publications

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“…In general, the regeneration rate is temperature dependent. The most advantageous way to get such high temperature is exploitation of the photon energy of the sun which reduces the environmental utilization of polluting gases that does not cause immense and impact on the energetic and economics [3,28]. The water-splitting process can produce H 2 gas, which is a promising solar fuel, and has the advantages that H 2 and O 2 gases can be separately recovered due to the two separated steps of the H 2 generation step and the O 2 releasing step.…”

Section: Resultsmentioning

confidence: 99%

Cobalt Ferrite Nanocrystallites for Sustainable Hydrogen Production Application

Gaikwad

Chae

Mane

et al. 2011

International Journal of Electrochemistry

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Cobalt ferrite, CoFe 2 O 4 , nanocrystalline films were deposited using electrostatic spray method and explored in sustainable hydrogen production application. Reflection planes in X-ray diffraction pattern confirm CoFe 2 O 4 phase. The surface scanning microscopy photoimages reveal an agglomeration of closely-packed CoFe 2 O 4 nanoflakes. Concentrated solar-panel, a two-step water splitting process, measurement technique was preferred for measuring the hydrogen generation rate. For about 5 hr sustainable, 440 mL/hr, hydrogen production activity was achieved, confirming the efficient use of cobalt ferrite nanocrystallites film in hydrogen production application.

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Section: Resultsmentioning

confidence: 99%

Cobalt Ferrite Nanocrystallites for Sustainable Hydrogen Production Application

Gaikwad

Chae

Mane

et al. 2011

International Journal of Electrochemistry

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“…The 2p 3/2 binding energy of Co (780.1 ± 0.3 eV) and its satellite around 785.7 eV, characteristic for Co 2? [52][53][54], the binding energy of Mn (641.1 ± 0.1 eV) and Ni (854.4 ± 0.2 eV) [53,55,56], and the Ni 2p 1/2 peak shape [52] indicate that all these transition metals are twofold positively charged, as expected for a spinel structure. Furthermore, iron is predominantly in a Fe 3?…”

Section: Ferrite Nanoparticle Synthesis and Dispersionsmentioning

confidence: 99%

Simultaneous formation of ferrite nanocrystals and deposition of thin films via a microwave-assisted nonaqueous sol–gel process

Bilecka

Kubli

Amstad

et al. 2010

J Sol-Gel Sci Technol

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Combination of the surfactant-free nonaqueous sol-gel approach with the microwave technique makes it possible to synthesize Fe 3 O 4 , CoFe 2 O 4 , MnFe 2 O 4 , and NiFe 2 O 4 nanoparticles of about 5-6 nm and with high crystallinity and good morphological uniformity. The synthesis involves the reaction of metal acetates or acetylacetonates as precursors with benzyl alcohol at 170°C under microwave irradiation of 12 min. Immersion of glass substrates in the reaction solution results in the deposition of homogeneous metal ferrite films whose thickness can be adjusted through the precursor concentration. If preformed nickel nanoparticles are used as a type of curved substrate, the ferrite nanoparticles coat the seeds and form core-shell structures. These results extend the microwave-assisted nonaqueous sol-gel approach beyond the simple synthesis of nanoparticles to the preparation of thin films on flat or curved substrates.

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“…[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] However, the efforts towards understanding the effect of the substitution of rare earth (R) ions in spinel oxides are meager. Engineering the materials and development of devices for high frequency applications based on nickel ferrites is clearly dependent upon the fundamental knowledge of electrical behavior of these materials.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, AC impedance and DC electrical conductivity characteristics of NiFe2-xGdxO4 (x = 0, 0.05 and 0.075)

Bharathi¹,

Markandeyulu

Ramana³

2012

AIP Advances

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The structure and electrical characteristics of Gd doped Ni ferrite materials, namely NiFe1.95Gd0.05O4 and NiFe1.925Gd0.075O4, are reported to demonstrate their improved electrical properties compared to that of pure NiFe2O4. NiFe1.95Gd0.05O4 and NiFe1.925Gd0.075O4 compounds crystallize in the cubic inverse spinel phase with a very small amount of GdFeO3 additional phase while pure NiFe2O4 crystallize in inverse spinel phase without any impurity phase. The back scattered electron imaging analysis indicate the primary and secondary formation in NiFe1.95Gd0.05O4 and NiFe1.925Gd0.075O4 compounds. Atomic force microscopy measurements indicate that the bulk grains are ∼2-5 micron size while the grain boundaries are thin compared to bulk grains. Impedance spectroscopic analysis at different temperature indicates the different relaxation mechanisms and their variation with temperature, bulk grain and grain-boundary contributions to the electrical conductivity (Rg) and capacitance (Cg) of these materials. The conductivity in pure NiFeO4 is found to be predominantly due to intrinsic bulk contribution (Rg=213 kΩ and Cg=4.5 x 10-8 F). In the case of NiFe1.95Gd0.05O4 and NiFe1.925Gd0.075O4 compounds, grain and grain-boundary contributions to the conductivity are clearly observed. The DC conductivity values (at 300 K) of NiFe2O4, NiFe1.95Gd0.05O4 and NiFe1.925Gd0.075O4 compounds are found to be 1.06 x 10-7 Ω-1 cm-1, 5.73 x 10-8 Ω-1 cm-1 and 1.28 x 10-8 Ω-1 cm-1 respectively.

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Cobalt ferrite thin films as anode material for lithium ion batteries

Cited by 168 publications

References 21 publications

Cobalt Ferrite Nanocrystallites for Sustainable Hydrogen Production Application

Cobalt Ferrite Nanocrystallites for Sustainable Hydrogen Production Application

Simultaneous formation of ferrite nanocrystals and deposition of thin films via a microwave-assisted nonaqueous sol–gel process

Microstructure, AC impedance and DC electrical conductivity characteristics of NiFe2-xGdxO4 (x = 0, 0.05 and 0.075)

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