In situ studies of the oxidation of nickel electrodes in alkaline solution

Medway, S.L.; Lucas, C. A.; Kowal, Andrzej; Nichols, Richard J.; Johnson, David M.

doi:10.1016/j.jelechem.2005.11.013

Cited by 282 publications

(245 citation statements)

References 65 publications

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“…Moreover, the β-Ni(OH) 2 formed on the electrode cannot be reduced in successive cathodic sweeps. 35 An important finding of this work is that the anodic processes, unlike those on a Ni electrode, are completely reversible. The metallic state Co is easily restored following anodization.…”

Section: ■ Results and Discussionmentioning

confidence: 82%

Observing the Electrochemical Oxidation of Co Metal at the Solid/Liquid Interface Using Ambient Pressure X-ray Photoelectron Spectroscopy

et al. 2017

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Recent advances of ambient pressure X-ray photoelectron spectroscopy (AP-XPS) have enabled the chemical composition and the electrical potential profile at a liquid/electrode interface under electrochemical reaction conditions to be directly probed. In this work, we apply this operando technique to study the surface chemical composition evolution on a Co metal electrode in 0.1 M KOH aqueous solution under various electrical biases. It is found that an ∼12.2 nm-thick layer of Co(OH)2 forms at a potential of about −0.4 VAg/AgCl, and upon increasing the anodic potential to about +0.4 VAg/AgCl, this layer is partially oxidized into cobalt oxyhydroxide (CoOOH). A CoOOH/Co(OH)2 mixture layer is formed on the top of the electrode surface. Finally, the oxidized surface layer can be reduced to Co0 at a cathodic potential of −1.35 VAg/Cl. These observations indicate that the ultrathin layer containing cobalt oxyhydroxide is the active phase for oxygen evolution reaction (OER) on a Co electrode in an alkaline electrolyte, consistent with previous studies.

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Section: ■ Results and Discussionmentioning

confidence: 82%

Observing the Electrochemical Oxidation of Co Metal at the Solid/Liquid Interface Using Ambient Pressure X-ray Photoelectron Spectroscopy

et al. 2017

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“…Several representative literature methods are summarized in table 7. (f) Surface layers on nickel An air-formed oxide layer, 6-8 Å thick, rapidly forms on Ni metal that has been mechanically or electro-polished. Ellipsometry measurements [176] and angle-resolved X-ray photoelectron spectroscopy (XPS) [177] show that this is a bilayer, with a Ni(OH) 2 layer underlaid by NiO a '-' Indicates experimental details that were not provided.…”

Section: (D) Chemical Ageingmentioning

confidence: 99%

Nickel hydroxides and related materials: a review of their structures, synthesis and properties

et al. 2015

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This review article summarizes the last few decades of research on nickel hydroxide, an important material in physics and chemistry, that has many applications in engineering including, significantly, batteries. First, the structures of the two known polymorphs, denoted as α-Ni(OH) 2 and β-Ni(OH) 2 , are described. The various types of disorder, which are frequently present in nickel hydroxide materials, are discussed including hydration, stacking fault disorder, mechanical stresses and the incorporation of ionic impurities. Several related materials are discussed, including intercalated α-derivatives and basic nickel salts. Next, a number of methods to prepare, or synthesize, nickel hydroxides are summarized, including chemical precipitation, electrochemical precipitation, sol-gel synthesis, chemical ageing, hydrothermal and solvothermal synthesis, electrochemical oxidation, microwaveassisted synthesis, and sonochemical methods. Finally, the known physical properties of the nickel hydroxides are reviewed, including their magnetic, vibrational, optical, electrical and mechanical properties. The last section in this paper is intended to serve as a summary of both the potentially useful properties of these materials and the methods for the identification and characterization of 'unknown' nickel hydroxide-based samples.

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“…The Ni thin films for magnetic measurements as working electrodes, a Pt sheet as a counter electrode, and a commercial Ag/AgCl electrode as a reference electrode and borate buffered solution (pH 9) as an electrolyte were used. An oxide with a few atomic layers was formed after the exposure of Ni thin films to the air for several days, and an additional hydroxide is formed on top of the air-formed oxide upon the immersion of film into alkaline solution [12]. Figure 2 shows the cyclic voltammogram of Ni thin film in borate buffered solution, in which the cathodic peak at −0.8 V with concomitant evolution of H 2 is assigned to the reduction of Ni(II) compounds, i.e.…”

Section: Methodsmentioning

confidence: 99%

“…Figure 2 shows the cyclic voltammogram of Ni thin film in borate buffered solution, in which the cathodic peak at −0.8 V with concomitant evolution of H 2 is assigned to the reduction of Ni(II) compounds, i.e. the transformation of NiO and α-Ni(OH) 2 back to metallic nickel, and the anodic peak at −0.6 V corresponds to the oxidation of nickel to NiO and α-Ni(OH) 2 , and the small current between −0.4 and 0.2V indicates that the dominant process is capacitive double layer charging [12]. Figure 3 shows the potential dependence of the Faraday ellipticity in the Ni thin film at a magnetic field of 1 and 6 kOe between −0.9 and 0.2 V. Both the data of the Faraday ellipticity at 1 and 6 kOe varied synchronously with the potential change.…”

Section: Methodsmentioning

confidence: 99%

Redox-Induced Modification of Magnetism in Ni Thin Film

Hiraoka

Oba

Watanabe

et al. 2009

e-J. Surf. Sci. Nanotechnol.

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Magnetic properties of Ni thin films which were modified through the redox reaction in alkaline solution were investigated by means of magneto-optical Faraday effect. The magnetization process of Ni film on which Ni(II) compounds electrochemically forms was different from that of fresh Ni films. This indicates that the magnetic anisotropy is modified through the redox reaction Ni(0)/Ni(II) which may induce the change in the volume of metallic nickel region and/or the magnetic coupling between the metallic Ni and some compound including Ni(II) formed on the film surface.

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In situ studies of the oxidation of nickel electrodes in alkaline solution

Cited by 282 publications

References 65 publications

Observing the Electrochemical Oxidation of Co Metal at the Solid/Liquid Interface Using Ambient Pressure X-ray Photoelectron Spectroscopy

Observing the Electrochemical Oxidation of Co Metal at the Solid/Liquid Interface Using Ambient Pressure X-ray Photoelectron Spectroscopy

Nickel hydroxides and related materials: a review of their structures, synthesis and properties

Redox-Induced Modification of Magnetism in Ni Thin Film

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