Hexagonal plate-like Ni–Co–Mn hydroxide nanostructures to achieve high energy density of hybrid supercapacitors

Abstract

Nanostructured mixed multi-metal compounds (NCM) based on nickel (Ni), cobalt (Co), and manganese (Mn) are considered as promising electrode materials owing to their multiple valence states, facile accessibility to active sites, and low activation energy for electron transfer.

NiSe2/Ni(OH)2 Heterojunction Composite through Epitaxial-like Strategy as High-Rate Battery-Type Electrode Material

“…Among them, supercapacitors are attractive due to their high safety, long cycle lives, large power densities, and low cost [11][12][13]. However, their low energy densities, compared with other electrochemical energy technologies, limit their further applications [14][15][16]. Several methods have been utilized to improve the energy storage performance of supercapacitor, and fabricating asymmetric supercapacitor is believed to be an ideal solution [17][18][19].…”

Interconnected network‐like single crystalline bimetallic carbonate hydroxide nanowires for high performance hybrid supercapacitors

“…The determined equivalent series resistance (ESR) of the NiCoCH was 0.55 Ω, lower than 0.77 and 0.82 Ω of the NiCH and CoCH (Figure S6D). Furthermore, the steeper vertical line of the NiCoCH than those of the NiCH and CoCH at low frequencies reveal the rapid and facile ion diffusion into the active sites of electrode materials 9,19 …”

“…Furthermore, the steeper vertical line of the NiCoCH than those of the NiCH and CoCH at low frequencies reveal the rapid and facile ion diffusion into the active sites of electrode materials. 9,19 The HSC full cells were configured by integrating a positive electrode of NiCoCH with a negative electrode of AC in 6 M KOH electrolyte, as shown in Figure 6 resembles a perfect rectangular shape contributes from a typical EDLC feature ( Figure S7). Figure 6A displays the CVs of NiCoCH nanowire and AC electrodes in a threeelectrode cell at 50 mV s −1 .…”

Cracked bark-inspired ternary metallic sulfide (NiCoMnS4) nanostructure on carbon cloth for high-performance aqueous asymmetric supercapacitors

“…Among the various types of supercapacitors available commercially, those based on aqueous electrolytes are of particular interest because of their high safety, low cost, and good environmental friendliness [16][17][18][19][20]. However, given the low electrochemical stability of water, improvements in energy density, which are vital for the practical applications of aqueous supercapacitors, are difficult to implement by simply increasing the working voltage.…”