Review of NiS-Based Electrode Nanomaterials for Supercapacitors

Abstract

As a new type of energy storage device, supercapacitors have the advantages of high-power densities, high safety factors, and low maintenance costs, so they have attracted widespread attention among researchers. However, a major problem with supercapacitors is that their energy densities are not high enough, which limits their application. Therefore, it is crucial to expand the application scenarios of supercapacitors to increase their energy density as much as possible without diminishing their advantages. The classification and working principles of supercapacitors are introduced in this paper. The electrochemical properties of pure NiS materials, NiS composites with carbon materials, NiS composites with sulfide materials, and NiS composites with transition metal oxides for supercapacitors are summarized. This paper may assist in the design of new electrode materials for NiS-based supercapacitors.

Hierarchical Nickel Cobalt Phosphide @ Carbon Nanofibers Composite Microspheres: Ultrahigh Energy Densities of Electrodes for Supercapacitors

“…The corresponding specific capacitances at different current densities were calculated from the GCD curves. In 0.05 M Fe(CN) 6 3−/4− + 1.0 M Na 2 SO 4 solution, the calculated capacitances of a CoNiP@CNFs-based PC electrode are 308.3, 255.9, 210.6, 165.1, and 143.8 mF cm −2 at current densities of 5, 10, 20, 30 and 40 mA cm −2 , respectively.…”

“…as well as electric vehicles has led to a rising urgent demand for humans to find a green energy storage device [1][2][3]. Among the various existing energy storage devices, supercapacitors (SCs) represent one of the most promising energy storage technologies due to their high power density, ultralong cycling life span, and fast charge/discharge process [4][5][6]. Compared to batteries, their drawback of low energy density (3-5 Wh kg −1 ) has been a bottleneck problem that restricts their possible industrial applications [7].…”

“…The resulting PCs exhibit much higher capacitance than EDLCs. For example, the capacitance of a CNF-based PC (constructed through the introduction of Fe(CN) 6 3−/4− redox couples) is about four times higher than that of a CNF-based EDLC [14].…”