Direct Low-Temperature Deposition of Crystallized CoOOH Films by Potentiostatic Electrolysis

Pauporté, Thierry; Mendoza, Leonardo Alfredo Forero; Cassir, M.; Bernard, Marie‐Claude; Chivot, J.

doi:10.1149/1.1842044

Cited by 130 publications

(90 citation statements)

References 25 publications

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“…Both Co 3 O 4 and CoO(OH) are easily obtained by thermally decomposing cobalt salts under oxidizing reactions [3]. Cobalt oxides have applications in superconductivity in electronics, electrochemical properties in microbatteries and high density batteries [4].…”

Section: Introductionmentioning

confidence: 99%

Variations of Optical and Structural Properties of CoxOy Thin Films with Thermal Treatment

Ekwealor

Offiah

Ezugwu

et al. 2014

Indian Journal of Materials Science

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The effects of thermal treatment on the optical and structural properties of cobalt oxide Co O thin films synthesized in the pores of PVP by chemical bath deposition technique were investigated. Films deposited were crystalline. The optical properties of the films were got from absorbance, transmittance reflectance, refractive index, absorption coefficient, and extinction coefficient measurements. The synthesized Co O films turned out to be cobalt oxyhydroxide , CoO(OH), nanocrystals. The crystals obtained were of size 41.84 nm; however, as annealing temperature increased, the size decreased to 16.28 nm. The absorption coefficient, refractive index, and extinction coefficient were found to increase with increase in annealing temperature though not sequentially. For the same energy ranges of the incident photons, the absorption coefficient and refractive index ranged from 0.2 to 1.8 and from 1.4 to 2.3, respectively. The energy band-gap of the films ranged from 1.96 eV to 2.22 eV.

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Section: Introductionmentioning

confidence: 99%

Variations of Optical and Structural Properties of CoxOy Thin Films with Thermal Treatment

Ekwealor

Offiah

Ezugwu

et al. 2014

Indian Journal of Materials Science

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“…Among the various oxide forms, cobalt(II) oxide (CoO) and cobalt(II, III) Co 3 O 4 are especially studied because of their interesting properties. Co 3 O 4 and its mixtures can be used as electrode materials in various applications such as reduction, electrochromic devices, 3 4 super capacitors, [5][6][7] lithium ion batteries, [8][9][10][11] protection film of cathodes in molten carbonate fuel cells, [12][13][14] oxygen evolution, [15][16][17] heterogeneous * Author to whom correspondence should be addressed. Email: muka@food.dtu.dk Received: 30 September 2011 Accepted: 11 November 2011 catalysis, [18][19][20] energy storage, 21 solid state sensors, 22 23 and as magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

Co₃O₄, ZnO, Co₃O₄-ZnO Nanofibers and Their Properties

Kanjwal¹,

Sheikh²,

Barakat³

et al. 2011

j nanoengng nanomfg

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Coupled nanofibers consisting of cobalt oxide (Co 3 O 4 and zinc oxide (ZnO) were prepared by the electrospinning process, and tested as a photocatalyst for dye degradation. Initially, electrospinning of a sol-gel consisting of cobalt acetate/zinc acetate/poly(vinyl alcohol) was used to produce polymeric nanofibers. Calcination of the obtained nanofibers in air at 600 C produced (Co 3 O 4 -ZnO) nanofibers. Scanning electron microscopy (SEM), and transmission electron microscopy (TEM), were employed to characterize the as-spun nanofibers and the calcined product. X-ray powder diffractometery (XRD) analysis was also used to characterize the chemical composition and the crystallographic structure of the produced nanofibers. Photodegradation of rhodamine B (RB) dye was studied individually using three photocatalysts: (Co 3 O 4 -ZnO) nanofibers, pristine (Co 3 O 4 and (ZnO) nanofibers. The (Co 3 O 4 -ZnO) nanofibers can eliminate all of the rhodamine B dye within about 90 min, however, the other two nanostructures could not totally eliminate all dye even after 3 h. Moreover, the tensile strength and the Young's modulus of coupled nanofibers were higher than that of pristine (CoAc/PVA) and (ZnAc/PVA) nanofibers. The increased mechanical properties of coupled nanofibers might be due to the chemical bonding between Zn 2+ and Co 2+ .

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“…It is important to notice that in any case, the cathode is in situ lithiated in the molten carbonate condition which induces compounds such as LiNiO 2 or LiNi x Co 1−x O 2 [7,9,12,15]. Different methods have been described to synthesize protective coating for NiO cathode (Pechini method [8], sol-gel impregnation technique [9,10], tape casting [11,12], electroless deposition process [13] or electrochemical techniques [14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Characterization in MCFC conditions of high-temperature, potentiostatically deposited Co-based thin films on NiO cathode

Lair

Ringuedé

Albin

et al. 2008

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Molten carbonate fuel cell (MCFC) is one of the most advanced high-temperature devices to convert chemical energy into electrical energy without pollution. It can be used in cogeneration as electrical and thermal generator because of its high working temperature (650°C). Nevertheless, its commercialization is still limited. In fact, its lifetime is mostly reduced by the dissolution of the cathode into the corrosive molten carbonate electrolyte. One of the ways to overcome this problem is to modify or protect the state-of-the-art cathode. In the last case, the deposit must present conductivity as good as the classical NiO porous cathode one but a lower solubility in the electrolyte. For this reason, thin films of cobalt(III) were electrodeposited. A classical three-electrode cell was used to deposit Co-based thin films by chronoamperometry in aqueous solution, at relatively high temperature (80°C). The deposition conditions lead to homogeneous, covering, and crystallized films. The microstructure and the crystallinity of the deposits were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) measurements. Then, their electrochemical properties were studied in the molten carbonate electrolyte under a mixture of CO 2 and air. In situ measurements such as chronopotentiometry at I=0 (open-circuit potential) or impedance spectroscopy were carried out during 48 h. Moreover, ex situ measurements such as inductively coupled plasma atomic emission spectroscopy to evaluate the solubility, or SEM and XRD measurements were performed to characterize the thin Co-based films in such molten carbonate fuel cell working cathodic conditions.

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Direct Low-Temperature Deposition of Crystallized CoOOH Films by Potentiostatic Electrolysis

Cited by 130 publications

References 25 publications

Variations of Optical and Structural Properties of CoxOy Thin Films with Thermal Treatment

Variations of Optical and Structural Properties of CoxOy Thin Films with Thermal Treatment

Co₃O₄, ZnO, Co₃O₄-ZnO Nanofibers and Their Properties

Characterization in MCFC conditions of high-temperature, potentiostatically deposited Co-based thin films on NiO cathode

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Direct Low-Temperature Deposition of Crystallized CoOOH Films by Potentiostatic Electrolysis

Cited by 130 publications

References 25 publications

Variations of Optical and Structural Properties of CoxOy Thin Films with Thermal Treatment

Variations of Optical and Structural Properties of CoxOy Thin Films with Thermal Treatment

Co3O4, ZnO, Co3O4-ZnO Nanofibers and Their Properties

Characterization in MCFC conditions of high-temperature, potentiostatically deposited Co-based thin films on NiO cathode

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Co₃O₄, ZnO, Co₃O₄-ZnO Nanofibers and Their Properties