Synthesis, morphology, electrical conductivity and electrochemical properties of α-Ni(OH)₂ and its composites with carbon

Abstract

A simple and effective hydrothermal synthesis of spherical α-Ni(OH)2 particles and α-Ni(OH)2/carbon composites was proposed. The mechanism of ultrafine α-Ni(OH)2 phase forming and correlations between synthesis conditions, morphology, electrical conductivity were analyzed. It was found that carbon nanoparticles form an electric conductive cover on nickel hydroxide microparticles during synthesis which increases overall electronic conductivity of the composite material. α-Ni(OH)2 and α-Ni(OH)2/C samples were tested as electrodes for hybrid supercapacitors. It was found that carbon coverings stabilize α-Ni(OH)2 phase in the alkaline medium. The comparison of the influence of laser irradiation and ultrasonic treatment on the electrochemical performance of the obtained materials was made.

Electrochemical Behavior of Nanocrystalline NiMoO₄ Hydrate Modified by Ultrasound

“…3). In electrochemical studies of α and β phases of nickel hydroxide [17,18] was found that the oxidation peaks lie in the range of 0.29-0.5 V for both phases, while the cathodic reduction peaks at 0.24 V for β-Ni(OH)2 and 0.16 V for α-Ni(OH)2, which agrees with the results obtained for initial NiMoO4 in this work.…”

Nickel Hydroxides: Requirements, Targeted Construction and Choice of Characteristics and Industrially Applicable Synthesis for Targeted Use in Electrochemical Devices

“…In [152,153] β‐hydroxide nickel/carbon composites were obtained and investigated. β‐Ni(OH) 2 /reduced graphene oxide composites [154–156] were also actively investigated, including the production of nickel hydroxide by ammonia precipitation in the presence of PEG600 [154] and hydrothermal synthesis [155] . In, [157] the authors studied α‐Ni(OH) 2 and its composites with carbon.…”

“…β-Ni(OH) 2 /reduced graphene oxide composites [154][155][156] were also actively investigated, including the production of nickel hydroxide by ammonia precipitation in the presence of PEG600 [154] and hydrothermal synthesis. [155] In, [157] the authors studied α-Ni(OH) 2 and its composites with carbon. Film electrodes deposited on an electrically conductive base were also studied, including by electrochemical [158] and chemical decomposition methods with Co activation.…”

Methods of obtaining nickel molybdates and composites of molybdate/carbon material for electrodes of hybrid supercapacitors (Review)

“…Nanostructured materials deserve much of attention due to their unique electrochemical, optical, magnetic, electrical and photocatalytic properties [1,2]. Nowadays among different ways of applying nanomaterials there is a significant increase of their application in energystorage devices due to the increasing public demand for them.…”