Capacitance Performance of Nanostructured CoNi₂S₄ with Different Morphology Grown on Carbon Cloth for Supercapacitors

Abstract

Nanostructured CoNi2S4 materials with different morphologies were successfully grown on carbon cloth through a facile precursor transformation method by adjusting the anions in nickel cobalt salts. The resulting samples were characterized by XRD, EDS, FESEM, and TEM and were found to display different morphologies. Their electrochemical performance was investigated by means of cyclic voltammetry (CV), galvanostatic charge–discharge, electrochemical impedance spectroscopy (EIS), and cycle life. The as‐obtained CoNi2S4 sample with NO3− as the anion in the nickel cobalt salt displayed an ultrahigh specific capacitance of 2714 F g−1 at 1 A g−1 and excellent rate capability (64.8 % capacity retention at 20 A g−1). However, the as‐obtained CoNi2S4 samples with SO42− and Cl− as the anions in the precursors displayed a limited specific capacitance of only 1750 and 1334 F g−1, respectively. Besides, they also displayed different performances in the cycle life test. The study indicates that the as‐obtained CoNi2S4 grown on carbon cloth prepared with NO3− as the anion will be a promising electrode material for supercapacitors.

Self‐Supporting CuCo2S4 Microspheres for High‐Performance Flexible Asymmetric Solid‐State Supercapacitors

“…The energy density was 46 Wh kg –1 at a power density of 1070 W kg –1 , and the capacitor retention rate was 92 % after 3000 cycles. Ai et al used hydrothermal method to grow NiCo 2 S 4 on carbon cloth and exhibits the capacitance of 2714 F g –1 at 1 A g –1 . In addition, a polar electrode material with more active sites can achieve chemical adsorption of sulfur and polysulfide, which can reduce the effect of the shuttle effect in Li‐S batteries…”

Mixed Metal Sulfides for Electrochemical Energy Storage and Conversion

“…To well address the above-mentioned issues, an intriguing strategy is to grow electroactive materials on conductive current collectors. Recently, nanoarrays of MMSs have been directly grown on conductive substrates, such as NF, [30,[111][112][113][114][115][116] carbon cloth (CC), [65,117,118] carbon fiber paper (CFP), [73,119,120] and so on, to construct 3D electrodes. Such binder-free and conductive-agent-free integrated electrodes can avoid the "dead surface" and the tedious process in preparing traditional slurry-coating electrodes and significantly improve the utilization rate of electroactive materials.…”

“…Ternary nickel cobalt sulfides with various crystal structures (such as NiCo 2 S 4 , [27,33,74,103,108,121] CoNi 2 S 4 , [93,98,111,117] Ni 1.5 Co 1.5 S 4 , [122] Co 0.9 Ni 0.1 S 2 , [123] Ni 3.5 Co 3.5 S 8 , [88] and Ni 3 Co 6 S 8 [124] ) and diverse nanostructures (such as nanoparticles, [92][93][94][95][96] nanotubes, [99] nanosheets, [100] and hierarchical porous/hollow nanostructures [28,74,75,79,83,99,[103][104][105][125][126][127][128] ) have been widely investigated and proved to possess superior electrochemical performance for energy storage and conversion. In this section, the application of nanostructured ternary nickel cobalt sulfides in HSCs, LIBs/SIBs, and electrocatalysis will be thoroughly summarized and discussed.…”

“…To avoid the "dead surface" and fully utilize electroactive materials, nanostructured nickel cobalt sulfides with various nanoarchitectures such as nanotubes, [30,112,[159][160][161] nanowires, [162] nanoneedles, [119] and nanosheets [66,111,117,[163][164][165][166][167][168][169][170][171][172] [108] Copyright 2013, Royal Society of Chemistry. Panels (c-e): Reproduced with permission.…”

Zn–Co Sulfide Microflowers Anchored on Three‐Dimensional Graphene: A High‐Capacitance and Long‐Cycle‐Life Electrode for Asymmetric Supercapacitors

“…In the past few years, many researchers have committed to solvingt his problem.M icro/nanostructures with special morphologies (urchinlike, core-shell structure, leaflike, nanowire arrays,m icroflowera rrays, etc.) [23] were designed and synthesized on effective conductive substrates such as Ni foam (NF), [24,25] carbon nanotubes, carbonc loth, [26] carbon fiber paper, [27] and three-dimensional graphene (3DG). [28] .F or example, Ta oe tal.…”