Some effects of the addition of cobalt to the nickel hydroxide electrode

Armstrong, R.D.; Briggs, G. W. D.; Charles, E.A.

doi:10.1007/bf01009266

Cited by 154 publications

(77 citation statements)

References 6 publications

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“…[18] The improved electrochemical characteristics can be attributed to the synergistic effects of coprecipitated Ni and Co species. Firstly, cobalt doping is generally considered to significantly improve the performance of Ni(OH) 2 through affecting both the ionic and the electric conductivity of the active material [40][41][42][43][44][45]. Co(II) was oxidized to CoOOH during charge and might maintain good conductivity, which acts as a current pathway and increases the electron conductivity.…”

Section: Resultsmentioning

confidence: 99%

Glycine-assisted hydrothermal synthesis of nanostructured Co x Ni1−x –Al layered triple hydroxides as electrode materials for high-performance supercapacitors

Zhang

Jiang

Yuan

et al. 2011

J Solid State Electrochem

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Nanostructured Co x Ni 1−x -Al layered triple hydroxides (Co x Ni 1−x -Al LTHs) have been successfully synthesized by a facile hydrothermal method using glycine as chelating agent. The samples were characterized by Xray diffraction, thermogravimetry, Fourier transform infrared spectroscopy and scanning electron microscopy. The morphologies of Co x Ni 1−x -Al LTHs varied with the Co content and its effect on the electrochemical behavior was studied by cyclic voltammetry and galvanostatic chargedischarge techniques. Electrochemical data demonstrated that the Co x Ni 1−x -Al LTHs with Co/Ni molar ratio of 3:2 owned the best performance and delivered a maximum specific capacitance of 1,375 Fg −1 at a current density of 0.5 A g −1 and a good high-rate capability. The capacitance retained 93.3% of the initial value after 1,000 continuous charge-discharge cycles at a current density of 2 A g −1 .

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Section: Resultsmentioning

confidence: 99%

Glycine-assisted hydrothermal synthesis of nanostructured Co x Ni1−x –Al layered triple hydroxides as electrode materials for high-performance supercapacitors

Zhang

Jiang

Yuan

et al. 2011

J Solid State Electrochem

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show abstract

“…4,5 Thus in contrast to electrolyser anode research, work in the battery area has been directed toward increasing the OER overpotential at nickel hydroxide electrodes. This has been achieved by the addition of cobalt hydroxide to the nickel hydroxide, 6 however, depending on the amount of incorporated Co, this procedure can actually improve OER catalytic activity. 7 These oxides have been prepared from inorganic precursor materials using a wide variety of approaches, including thermal decomposition, spray pyrolysis, sol-gel routes and freeze drying, precipitation or electrodeposition from solution.…”

mentioning

confidence: 99%

Hydrous Nickel Oxide: Redox Switching and the Oxygen Evolution Reaction in Aqueous Alkaline Solution

Lyons

Doyle

Godwin

et al. 2012

J. Electrochem. Soc.

117

137

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The redox switching reaction and the oxygen evolution reaction at multi-cycled nickel oxy-hydroxide films in aqueous alkaline solution are discussed. The hydrous oxide is considered as a porous assembly of interlinked octahedrally coordinated anionic metal oxyhydroxide surfaquo complexes which form an open network structure. The latter contains considerable quantities of water molecules which facilitate hydroxide ion discharge at the metal site during active oxygen evolution. The dynamics of redox switching has been quantified in terms of a diffusive frequency using the Laviron-Aoki diffusion model. Steady state Tafel plot analysis has been used to elucidate the kinetics and mechanism of oxygen evolution with slopes of ca. 60 mVdec −1 and ca. 120 mVdec −1 at low and high overpotentials respectively, whereas the reaction order with respect to hydroxide ion activity remains invariant at ca. 1.0 as the potential is increased. These observations are rationalized in terms of a kinetic scheme involving surfaquo groups.

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“…Thus in contrast to electrolyser anode research, work in the battery area has been directed towards increasing the OER overpotential at nickel hydroxide electrodes. This has been achieved by the addition of cobalt hydroxide to the nickel hydroxide (6), however, depending on the amount of incorporated Co, this procedure can actually improve OER catalytic activity (7). These oxides have been prepared from inorganic precursor materials using a wide variety of approaches, including thermal decomposition, spray pyrolysis, sol-gel routes and freeze drying, precipitation or electrodeposition from solution.…”

Section: Introductionmentioning

confidence: 99%

Redox Switching and Oxygen Evolution at Hydrous Nickel Oxide Films in Aqueous Alkaline Solution

et al. 2013

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The redox switching reaction and the oxygen evolution reaction at multi-cycled nickel oxy-hydroxide films in aqueous alkaline solution are discussed. The hydrous oxide is considered as a porous assembly of interlinked octahedrally coordinated anionic metal oxyhydroxide surfaquo complexes which form an open network structure. The latter contains considerable quantities of water molecules which facilitate hydroxide ion discharge at the metal site during active oxygen evolution. The dynamics of redox switching has been quantified in terms of a diffusive frequency using the Laviron-Aoki diffusion model. Steady state Tafel plot analysis has been used to elucidate the kinetics and mechanism of oxygen evolution with slopes of ca. 60 mVdec -1 and ca. 120 mVdec -1 at low and high overpotentials respectively, whereas the reaction order with respect to hydroxide ion activity remains invariant at ca. 1.0 as the potential is increased. These observations are rationalized in terms of a kinetic scheme involving surfaquo groups.

show abstract

Some effects of the addition of cobalt to the nickel hydroxide electrode

Cited by 154 publications

References 6 publications

Glycine-assisted hydrothermal synthesis of nanostructured Co x Ni1−x –Al layered triple hydroxides as electrode materials for high-performance supercapacitors

Glycine-assisted hydrothermal synthesis of nanostructured Co x Ni1−x –Al layered triple hydroxides as electrode materials for high-performance supercapacitors

Hydrous Nickel Oxide: Redox Switching and the Oxygen Evolution Reaction in Aqueous Alkaline Solution

Redox Switching and Oxygen Evolution at Hydrous Nickel Oxide Films in Aqueous Alkaline Solution

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