Synthesis and Characterization of Highly Uniform CuCo₂S₄ Ball‐in‐Ball Hollow Nanospheres as High Performance Electrode for Supercapacitors

Abstract

Highly uniform and monodispersed CuCo 2 S 4 ball-in-ball hollow nanospheres (HNSs) are successfully synthesized from CuCo-glycerate nanospheres (NSs) precursors via a facile two-step solvothermal process. The most influential parameter in anion exchange reaction between glycerate and sulfur ion is the solvothermal time, which plays a significant role in enhancing the structural and electrochemical properties. Impressively, CuCo 2 S 4 ball-in-ball HNSs obtained through a sulfurization reaction time of 18 h show high capacitance (442 F g À1 at current density of 0.5 A g À1 ) and superior electrochemical stability (84.5% at 5 A g À1 after 5000 cycles), which can realize highperformance materials for supercapacitors.

CuCo2S4–MoS2 nanocomposite: a novel electrode for high-performance supercapacitors

“…Furthermore, the self-agglomeration along with the volume change at the time of charge/discharge processes are the major drawbacks of CuCo 2 S 4 which must be reduced to enhance its electrochemical performance. 21–23…”

Tunability of Porous CuCo2O4 Architectures as High‐Performance Electrode Materials for Supercapacitors

“…From the cyclic voltammogram of nanomaterials recorded at low sweep rate of 5 mV s −1 displaying the well‐defined redox peaks at around ∼0.31/0.19 V and ∼0.36/0.25 V for A1/C1 and A2/C2, respectively. Which can be endorsed to the reversible redox reaction of M(Ox)↔M(Red) (M: Cu 2+ /Cu + or Co 4+ /Co 3+ /Co 2+ ), reflecting the CuCo 2 O 4 nanomaterial has capacitive behaviour . The anodic and cathodic peak separation upsurges with increasing sweep rate can be seen in Figure .…”

“…Which can be endorsed to the reversible redox reaction of M(Ox) $ M(Red) (M: Cu 2 + /Cu + or Co 4 + /Co 3 + /Co 2 + ), reflecting the CuCo 2 O 4 nanomaterial has capacitive behaviour. [38,39] The anodic and cathodic peak separation upsurges with increasing sweep rate can be seen in Figure 6. The increasing trend of peak separation and area is owing to ohmic resistance and polarization of the electrode during the electrochemical redox reaction.…”

In Situ Growth of Core–Shell Heterostructure CoMoO4@CuCo2S4 Meshes as Advanced Electrodes for High-Performance Supercapacitors

“…32 Lee et al prepared CuCo 2 S 4 hollow nanospheres, which shows a C sp of 442 F•g −1 . 33 Although the performance is optimized by designing different nanostructures, the inherent slow electron/ion transmission rate still leads to unsatisfactory cycling performance and severe structural collapse during rapid charging and discharging processes, which restricts their practical application. To overcome this shortcoming, a strategy is to assemble the core−shell heterostructures.…”

“…Despite the advantages of cobalt–molybdenum transition oxide, the slow redox kinetics and ion diffusion rates are still challenges for improving the performance. , Recently, bimetallic sulfides have been proven to possess higher electrical conductivity and energy density. − Moreover, CuCo 2 S 4 has rich redox-active reaction sites, which has been considered to be a potential electrode material. ,− For example, Yuan et al fabricated CuCo 2 S 4 nanotubes on carbon fibers and exhibited a C sp of 456 F·g –1 at 1 A·g –1 with 83% of the initial C sp remaining over 5000 cycles . Lee et al prepared CuCo 2 S 4 hollow nanospheres, which shows a C sp of 442 F·g –1 . Although the performance is optimized by designing different nanostructures, the inherent slow electron/ion transmission rate still leads to unsatisfactory cycling performance and severe structural collapse during rapid charging and discharging processes, which restricts their practical application.…”