Ni–Co sulfide nanowires on nickel foam with ultrahigh capacitance for asymmetric supercapacitors

Abstract

Ni–Co sulfide nanowires synthesized by a two-step hydrothermal method show good performance when used as the positive electrode for asymmetric supercapacitors.

Hierarchical structures of nickel, cobalt-based nanosheets and iron oxyhydroxide nanorods arrays for electrochemical capacitors

“…The Ni-Co LDH, NiCo 2 O 4 and NiCo 2 S 4 deliver an areal capacitance of 402, 292 and 531 mF cm À2 , respectively. In contrast, among these three samples, NiCo 2 S 4 has the highest areal capacitance, similar to the results reported in the literature [33,43,44].…”

Nickel Sulfide Nanoparticles Synthesized by Microwave-assisted Method as Promising Supercapacitor Electrodes: An Experimental and Computational Study

“…With the increase of sweep rates, the current density increases and the oxidation peaks shifted to a more positive position and the reduction peaks to a more negative position, which is due to an increase of the internal diffusion resistance under the increase of scan rate. This indicates that the fast redox reactions occur at the electro-active material/electrolyte interface [47,48]. Fig.…”

A novel aqueous asymmetric supercapacitor based on petal-like cobalt selenide nanosheets and nitrogen-doped porous carbon networks electrodes

“…ASC is usually assembled with two differents electrodes and utilizes their different potential windows in the same electrolyte to broaden its overall operating voltage. Great efforts have been devoted to exploring various aqueous ASC systems, such as MnO 2 //graphene [24], Ni(OH) 2 //activated carbon [25], NieCo sulfide//activated carbon [26], but most of them still use traditional activated carbon as negative electrodes. Therefore, ASCs are fabricated by novel cobalt selenide as the positive electrode and nitrogen-doped porous carbon materials with network architectures as the negative electrode, which seem to meet these requirements of energy storage devices with large operating voltage window and high energy density.…”