MWCNTs/NiS2 decorated Ni foam based electrode for high-performance supercapacitors

High-Performance Supercapacitor Electrode Obtained by Directly Bonding 2D Materials: Hierarchal MoS2 on Reduced Graphene Oxide

“…The GCD analysis shows that, with the increase in current densities, discharge time decreases. This is because electrochemical kinetics could not cope with fast fluctuations in potential because of the sluggish transport of ions and ineffective utilization of active materials (Azad et al, 2020;. The charging profiles are nearly straight and identical to the discharge counterparts, which again reveals the outstanding reversibility of the MoS 2 /rGO electrode.…”

“…Figure 7A shows the Nyquist plot of synthesized electrodes. The inset in Figure 7A presents the equivalent circuit elements (Azad et al, 2020), where "R 1 " is the ohmic resistance of the solution between the working and reference electrode, "R 2 " is the polarization or the charge transfer resistance at the electrode and solution interface, "Q 2 " is the constant phase element at this interface, "W 2 " is Warburg impedance, and "C 3 " is the faradic capacitance. Usually, a semi-circle (dia of this circle gives R ct ) could be observed in the "Nyquist plot" at higher frequencies, because of charge transfer resistances caused by faradic reactions.…”

“…The bode plot of MoS 2 and MoS 2 /rGO is presented in Figure 7B. The impedance features of the supercapacitor fall among ideal resistors (phase angle 0°) and ideal capacitors (phase angle 90°) (Azad et al, 2020;Baig et al, 2020). The phase angle for MoS 2 /rGO and MoS 2 was 79.8°and 65.6°, representing the outstanding pseudocapacitance performance of active materials.…”

Effect of Electrolyte Concentration on Electrochemical Performance of Bush Like α‐Fe2O3 Nanostructures

“…Generally, the specific capacitance of an electrode material is a combination of pseudocapacitance originating from the surface properties and faradaic capacitance due to redox reactions. [66][67][68]20] The specific capacitance depends on the rate of charge transfer within the electrode material and the diffusion ability of the electrolyte ions. Thus, electrochemical reactions within the electrode material either diffusion controlled or surface controlled which can be evaluated by the relationship between log ν (scan rate) and log i (peak current) in terms of the following relation with adjustment parameters a and b are [69][70] ;…”

Zeolitic imidazolate framework (ZIF)-derived porous carbon materials for supercapacitors: an overview

“…106 One promising approach is the growth or mixing of MOF-derived metal compounds on or with highly conductive substrates or additives, such as nickel foam (NF), CNTs, graphene, activated carbon, carbon aerogel, and MoS 2 . [107][108][109][110][111] Not only the electrical conductivity but also the number of active sites on the surface of the electrode can be improved by tuning the linkage compound amongst the active material and the conductive substrate/ additive. 112 Compared with nickel oxides, nickel suldes oen have better structural stability and faster electron transfer, which is ascribed to the lesser electronegativity value of sulfur in comparison to oxygen.…”