Electrolytic nickel sulfide in a model electrochemical capacitor

Abstract

Operation of an electrode made of electrolytic nickel sulfi de in a prototype electrochemical capacitor with potassium hydroxide solutions of various concentrations was studied by cyclic voltammetry.The growing demand for power sources for modern communication facilities and transportation require that a power source should combine high stored energy with high output power. These requirements are satisfi ed by hybrid systems combining rechargeable batteries of the type of lithium-ion intercalation systems and electrochemical capacitors (supercapacitors) of the type of Faraday pseudo-capacitors or capacitors of nonFaraday double-layer nature. The interest in components of hybrid systems and, in particular, electrochemical capacitors and materials for their electrodes is increasing.Electrolytic (e) sulfi des of transition metals (M = Co, Ni, Fe) attract attention as electrode materials capable of providing satisfactory discharge characteristics in thin-layer model lithium batteries [1]. It has been shown that semiconducting metal-sulfi de material (amorphous sulfi de CoS x , synthesized by the hydrothermal method) can also be used in electrodes of an electrochemical capacitor (EC). It is known that the electrochemical characteristics of electrode materials depend on methods of their fabrication. We studied whether a number of electrolytically produced transition metal sulfi des are suitable for ECs. In this communication, we present results of testing of electrolytic nickel sulfi de in a prototype electrochemical capacitor with an alkaline solution.

Chemical Synthesis and Characterization of Nickel Sulphide Thin Film Electrode for Supercapacitor Performances

“…The voltammetric responses of NiS electrode at different scan rates are shown in figure 3. It was found that the current under curve is slowly increased with scan rate [5][6][7][8][9]. Maximum capacitance obtained for NiS at 50 mVs -1 scan rate is 353 Fgm -1 .…”

“…In present work, electrochemical capacitive properties of the NiS thin film electrodes were investigated for improve supercapacitor performance. Many articles related to studies of NiS electrode for capacitive performance have been appeared in the literature [5][6][7][8][9].…”

Synthesis and Characterization of Chemically Deposited Nickel Sulphide Thin Film Electrodes for Electrochemical Supercapacitor Application

“…It was found that the current under curve is slowly increased with scan rate. This showed that voltammetric currents are directly proportional to the scan rate of CV, indicating an ideally capacitive behavior [14][15][16][23][24][25].…”

“…After 3000 cycles, a high specific capacitance of 778.8 Fg -1 maintains at current density is 4 Ag -1 [15]. Apostolova et al reported a thin-layer NiS electrode is capable of reversible electrochemical transformation during more than 200 cycles with an output capacitance of 143 Fg -1 [16]. Among these deposition techniques, chemical bath deposition presently attracts considerable attention, as it does not require sophisticated instrument.…”

Poly(3,4-ethylenedioxythiophene)/nickel disulfide microspheres hybrid in energy storage and conversion cells

“…It can be synthesized in various nanostructured morphologies with great ease and it nds applications in both electrochemical energy storage devices and photovoltaic cells. [30][31][32][33][34][35][36] However, the synthesis of nickel sulde with uniform nanostructured shapes and in pure phase is an arduous task. 37 Some interesting results are summarized here.…”