One-step synthesis of nickel cobalt sulphides particles: tuning the composition for high performance supercapacitors

Abstract

NiS2–CoS2 composites with different Ni and Co molar ratios for supercapacitors (SCs) were synthesized by one-step hydrothermal co-deposition method. Among them, Ni/Co/S-1 (Ni : Co ratio of 1 : 1) possesses the highest Cm value at the same current densities.

Engineering Pyrite-Type Bimetallic Ni-Doped CoS2 Nanoneedle Arrays over a Wide Compositional Range for Enhanced Oxygen and Hydrogen Electrocatalysis with Flexible Property

“…Thus, in our study, the Ni 0.33 Co 0.67 S 2 sample may have possessed the highest electrical conductivity in the Ni x Co 1−x S 2 series, which facilitated the electron transfer during the catalytic reaction and allowed the superior catalytic activity toward both HER and OER. Actually, the optimized electron transfer at a moderate addition of Ni atoms into CoS 2 has been already revealed in literature [42], and is also corroborated by the EIS analysis, whereby the Ni 0.33 Co 0.67 S 2 exhibits the lowest charge transfer resistance among all studied compounds herein (Figure 5c). Otherwise, as revealed by the characterization of the electrochemical active surface area (Figure 6c), the catalytic active sites should also play a pivotal role in determining the catalytic performance.…”

Hollow Hierarchical Carbon Spheres Decorated with Ultrathin Molybdenum Disulfide Nanosheets as High‐Capacity Electrode Materials for Asymmetric Supercapacitors

“…More importantly, MoS 2 @HCS//RGO can still deliver the energy density of 11 Wh kg −1 even at a high power density of 4.9 kW kg −1 . It is noteworthy that the energy densities of MoS 2 @HCS//RGO are comparable to or even higher than those of hollow sphere based ASCs including NiCo 2 O 4/ /AC (11.6 Wh kg −1 at 5.2 kW kg −1 ; 10.9 Wh kg −1 at 8.16 kW kg −1 , MnO 2 //GHCS (4.1 Wh kg −1 at 5.5 kW kg −1 ), and Ni/Co/S//AC (13.4 Wh kg −1 at 7.4 kW kg −1 ) . The leakage current and self‐discharge characteristics of supercapacitors are important figure of merit in their practical operation.…”

One‐step synthesis of anionic S‐substitution toward Ni 2 P (S) nanowires on nickel foam for enhanced hydrogen evolution reaction

“…As reported previously, the peaks observed at 160.7 and 161.9 eV in the S 2p spectrum can be ascribed to the low coordination sulfur ions on the surface and metal‐sulfur bonds, respectively, but there is a negative shift (Figure 3D). 38,44‐46 The interaction between P and S may be responsible for the shift in the binding energies of P 2p and S 2p. In other words, the introduction of S changes the charge environment of P, resulting in a change in the catalytic performance 47…”