Characterization of Spinel‐Type Cobalt and Nickel Oxide Thin Films by X‐Ray Near Grazing Diffraction, Transmission and Reflectance Spectroscopies, and Cyclic Voltammetry

Nkeng, Paul; Poillerat, G.; Koenig, J. F.; Chartier, P.; Lefez, B.; Lopitaux, J.; Lenglet, M.

doi:10.1149/1.2044193

Cited by 88 publications

(37 citation statements)

References 4 publications

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“…To study the hybridized Zn–Co 3 O 4 and Zn–air reactions of the Co 3 O 4 /carbon cloth electrode, the cyclic voltammetric (CV) test was then carried out in 6 m KOH. As shown in Figure S6 in the Supporting Information, in addition to the conventional cathodic ORR and anodic OER current at the potentials of <1.0 or >2.1 V, respectively, the CV curve recorded in ambient air includes three pairs of redox peaks in the range of 1.7 and 2.1 V. The first pair (I a /I c ) corresponds to the electrochemical transition involving Co(OH) 2 /Co 3 O 4 , while the second (II a /II c ) and the third pair (III a /III c ) can be attributed to the conversion of Co 3 O 4 /CoOOH and CoOOH/CoO 2 species, respectively . These phenomena are different from the reported active materials of NiO/Ni(OH) 2 and NiCo 2 O 4 , in which only one redox couple (i.e., Ni 2+ /Ni 3+ ) is presented .…”

Section: Resultsmentioning

confidence: 99%

“…The rapid kinetics of the redox reactions involving cobalt (Equations and ) generates a higher working voltage, while the oxygen reactions (Equation ) result in a high capacity. Consequently, a hybrid Zn battery with a liquid alkaline electrolyte perfectly integrated the advantages of a Zn–air battery and a Zn–Co 3 O 4 battery and delivered a high voltage of 1.85 V and a high capacity of 792 mAh g Zn −1 .…”

Section: Introductionmentioning

confidence: 99%

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Co₃O₄ Nanosheets as Active Material for Hybrid Zn Batteries

Tan

Chen

et al. 2018

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The rapid development of electric vehicles and modern personal electronic devices is severely hindered by the limited energy and power density of the existing power sources. Here a novel hybrid Zn battery is reported which is composed of a nanostructured transition metal oxide-based positive electrode (i.e., Co O nanosheets grown on carbon cloth) and a Zn foil negative electrode in an aqueous alkaline electrolyte. The hybrid battery configuration successfully combines the unique advantages of a Zn-Co O battery and a Zn-air battery, achieving a high voltage of 1.85 V in the Zn-Co O battery region and a high capacity of 792 mAh g . In addition, the battery shows high stability while maintaining high energy efficiency (higher than 70%) for over 200 cycles and high rate capabilities. Furthermore, the high flexibility of the carbon cloth substrate allows the construction of a flexible battery with a gel electrolyte, demonstrating not only good rechargeability and stability, but also reasonable mechanical deformation without noticeable degradation in performance. This work also provides an inspiring example for further explorations of high-performance hybrid and flexible battery systems.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Co₃O₄ Nanosheets as Active Material for Hybrid Zn Batteries

Tan

Chen

et al. 2018

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143

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“…The cyclic voltammograms obtained from all three Co3O4 samples showed a redox couple at 1.48 V vs RHE related to the Co (III)/ Co (IV) transition of spinel-type cobalt oxide 74,75 prior to…”

Section: Electrocatalytic Activity Towards the Oxygen Evolution Reactmentioning

confidence: 99%

Virus-directed formation of electrocatalytically active nanoparticle-based Co₃O₄ tubes

et al. 2017

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Spinel-type CoO finds applications in a wide range of fields, including clean energy conversion, where nanostructured CoO may provide a cost-efficient alternative to platinum- and iridium-based catalysts for electrocatalytic water-splitting. We here describe a novel strategy in which basic cobalt carbonate - a precursor to CoO - is precipitated as sheet-like structures and microspheres covered with fine surface protrusions, via ammonium carbonate decomposition at room temperature. Importantly, these mild reaction conditions enable us to employ bio-inspired templating approaches to further control the mineral structure. Rod-like tobacco mosaic viruses (TMV) were used as biotemplates for mineral deposition, where we profit from the ability of Co(ii) ions to mediate the ordered assembly of the virus nanorods to create complex tubular superstructures of TMV/ basic cobalt carbonate. Calcination of these tubules is then achieved with retention of the gross morphology, and generates a hierarchically-structured solid comprising interconnected CoO nanoparticles. Evaluation of these CoO materials as electrocatalysts for the oxygen evolution reaction (OER) demonstrates that the activity of CoO prepared by calcination of ammonia diffusion-grown precursors in both, the absence or presence of TMV exceeds that of a commercial nanopowder.

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“…Low spectral reflectance indicates high absorptance and vice versa. To the best of our knowledge, only a few previous studies on the optical properties of cobalt-based metal oxides (M x Co y O z with M = Mn, Cu, Ni) thin film coatings have been carried out [1,22,40,41].…”

Section: Optical Propertiesmentioning

confidence: 99%

Optical and mechanical characterization of novel cobalt-based metal oxide thin films synthesized using sol–gel dip-coating method

Amri

Jiang

Pryor

et al. 2012

Surface and Coatings Technology

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ÔØ Å ÒÙ× Ö ÔØOptical and mechanical characterization of novel cobalt-based metal oxide thin films synthesized using sol-gel dip-coating method This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 AbstractNew cobalt-based metal oxide thin films (M x Co y O z with M = Mn, Cu, Ni) have been deposited on commercial aluminium and glass substrates using sol-gel dip-coating method.The as-deposited films were characterized by a wide range of complementary techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), Spectrophotometry and Nanoindentation techniques. A light absorption study for coatings on glass substrates within a wavelength range of 300-1100 nm was also conducted. Topographical and morphological investigations showed the presence of nano-sized, grain-like particles in the copper-cobalt oxide coatings, which consequently had the roughest surface among the three coatings. All coatings on glass substrate exhibited higher absorption of ultraviolet (UV) light compared to visible light, while coatings on aluminium substrate generally had low reflectance (< 50 %) of UV light, moderate reflectance (< 80 %) of visible light and high reflectance (up to 100 %) of infrared light. Implications of optical properties as a function of film thickness controlled by dip-heating cycles were discussed. The elastic modulus (E) and hardness (H) of thin film samples compared with standalone commercial aluminium substrate were also measured.

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Characterization of Spinel‐Type Cobalt and Nickel Oxide Thin Films by X‐Ray Near Grazing Diffraction, Transmission and Reflectance Spectroscopies, and Cyclic Voltammetry

Cited by 88 publications

References 4 publications

Co₃O₄ Nanosheets as Active Material for Hybrid Zn Batteries

Co₃O₄ Nanosheets as Active Material for Hybrid Zn Batteries

Virus-directed formation of electrocatalytically active nanoparticle-based Co₃O₄ tubes

Optical and mechanical characterization of novel cobalt-based metal oxide thin films synthesized using sol–gel dip-coating method

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Characterization of Spinel‐Type Cobalt and Nickel Oxide Thin Films by X‐Ray Near Grazing Diffraction, Transmission and Reflectance Spectroscopies, and Cyclic Voltammetry

Cited by 88 publications

References 4 publications

Co3O4 Nanosheets as Active Material for Hybrid Zn Batteries

Co3O4 Nanosheets as Active Material for Hybrid Zn Batteries

Virus-directed formation of electrocatalytically active nanoparticle-based Co3O4 tubes

Optical and mechanical characterization of novel cobalt-based metal oxide thin films synthesized using sol–gel dip-coating method

Contact Info

Product

Resources

About

Co₃O₄ Nanosheets as Active Material for Hybrid Zn Batteries

Co₃O₄ Nanosheets as Active Material for Hybrid Zn Batteries

Virus-directed formation of electrocatalytically active nanoparticle-based Co₃O₄ tubes