Asymmetric supercapacitors based on SnNiCoS ternary metal sulfide electrodes

Abstract

While metal sulfides have extensively investigated as electrode materials for supercapacitors, the further optimization of their material system is still necessary to achieve satisfied performance. In this work, we reported the synthesis of ternary metal sulfide SnNiCoS and its application as electrode material of asymmetric supercapacitors, in which active carbon is used as the other electrode. For control experiments, asymmetric supercapacitors based on single metal sulfide CoS and binary metal sulfide NiCoS are also fabricated and investigated. The results show that the nanospherical SnNiCoS achieves the best performance. Ternary sulphide materials offer more redox than corresponding single-metal sulphides due to the synergy among various transition metal elements. The specific capacitance is 18.6 F cm-2 at current density of 5 mA·cm-2. An energy density of 937.2 μWh cm-2 is achieved at a power density of 4000 μW·cm-2. After 8000 cycles, the capacity retention rate is 82.9%. Present work indicates that SnNiCoS ternary metal sulfide could be a promising composite for high performance supercapacitors.

Nanosheet‐like MoO3 and conductive PANI electrodeposited on flexible carbon cloth for self‐supported solid‐state supercapacitor electrode

“…The magnitude of the value ( b ) represents its electrochemical behavior. When b = 1 represents the fully capacitive behavior, and b = 0.5 provides the fully diffusion‐controlled Faraday process 52 . The b value was determined from the log( v )–log( i ) plots of Figure 5c.…”

“…When b = 1 represents the fully capacitive behavior, and b = 0.5 provides the fully diffusion-controlled Faraday process. 52 The b value was determined from the log(v)-log(i) plots of Figure 5c. The b values of 0.63, 0.54, 0.89, and 0.64 calculated for the anodic and cathodic peaks of A-A' and B-B 0 , respectively, indicating that the charge storage process of the PMC-3 electrode has both capacitance-controlled and diffusion-controlled characteristics.…”

Recent advances in Ni-materials/carbon nanocomposites for supercapacitor electrodes

“…The various supercapacitors based on the Ni materials//active carbon electrodes have been employed in electrochemical applications, and the novel results of the reported papers are tabulated in Table 4. 182–219 The utilization of active carbon in supercapacitors highlights its valuable role in improving energy storage capabilities and supporting advancements in various fields where efficient power delivery and rapid energy transfer are essential. Ni(OH) 2 /ZIF-67-derived CoS core/carbon cloth (Ni(OH) 2 /CoS/CC) was used in the supercapacitor of Ni(OH) 2 /CoS/CC (cathode)//AC (anode) that revealed a remarkable energy density as well as its excellent electro-catalytic activity towards methanol oxidation.…”

“…The electrochemical processes involve fast reversible redox reactions of Ni 2+ /Ni 3+ , Co 2+ /Co 3+ , and Co 3+ /Co 4+ reacting with OH − anions and can be obtained from: 185–196 NiS + OH − ↔ NiSOH + e − CoS + OH − ↔ CoSOH + e − CoSOH + OH − ↔ CoSO + H 2 O + e − SnNiCoS sulfide in the supercapacitors showed the best performance in that a specific capacitance of 18.6 F cm −2 and an energy density of 937.2 μW h cm −2 was achieved. 197 Zhao et al 198 prepared the CuCo 2 O 4 @NiMn LDH//AC as supercapacitor electrodes and exhibited a specific capacity of 2156.53 F g −1 with a rate capability retention of 94.6% after 2500 cycles. A supercapacitor based on the NiCo 2 O 4 @NiCo 2 O 4 //AC electrodes is reported in ref.…”

MnNbS/Polyaniline Composite‐Based Electrode Material for High‐Performance Energy Storage Hybrid Supercapacitor Device

“…[16][17][18][19] Transition metal sulfides have received a lot of interest in this context because they have a wide range of oxidation states, and sulfur compounds have a large theoretical capacity, making them a promising typical pseudocapacitive material for energy storage applications. [20][21][22] Furthermore, the electronegativity of sulfur in these structures is lower than that of oxygen, ensuring greater flexibility. [23] However, most metal sulfide compounds exhibited intrinsically low electrical conductivity, resulting in an irreversible Faradic reaction.…”