ZnCo2O4-ZnO@C@CoS Core-shell Composite: Preparation and Application in Supercapacitors

doi:10.15541/jim20230481

Abstract

Abstract:

Supercapacitors, distinguished by their unique advantages, including high power performance, stable cycling behavior, and excellent safety, emerge as highly promising energy storage devices in the fields of new energy vehicles and mobile electronic applications. However, the issue of relatively low energy density continues to constrain their practical applications. To enhance electrochemical activity, CoS nanosheets were deposited onto ZnCo₂O₄-ZnO microspheres coated with carbon (ZCO-ZO@C@CoS) using a facile solvothermal method, calcination treatment, and electrochemical deposition reaction. Carbon layer not only promoted electron transport to enhance electrical conductivity, but also improved the stability of the structure. The open network space formed between CoS nanosheets facilitated rapid ion transport. Additionally, CoS nanosheets possessed abundant electroactive sites, enabling rapid reversible redox reactions. The co-effect of nanowires of the core-shell structure, the carbon layer, and the outer nanosheets effectively enhanced the overall electrochemical performance. Consequently, ZCO-ZO@C@CoS exhibited a specific capacitance of 1944 F·g^-1 (972.0 C·g^-1) at 1.5 A·g^-1, with an initial capacity retention of 75% after 10000 cycles at high current density of 20 A·g^-1. The asymmetric supercapacitor device, comprising ZCO-ZO@C@CoS (positive electrode) and activated carbon (negative electrode), also demonstrated excellent specific capacitance, high-rate performance, and exceptional cycling stability, indicating significant potential for practical applications.

Key words: asymmetric supercapacitor, transition metal dichalcogenide, CoS nanosheet, hierarchical core-shell structure

CLC Number:

O614

YANG Endong, LI Baole, ZHANG Ke, TAN Lu, LOU Yongbing. ZnCo₂O₄-ZnO@C@CoS Core-shell Composite: Preparation and Application in Supercapacitors[J]. Journal of Inorganic Materials, 2024, 39(5): 485-493.

Figures/Tables 8

Fig. 1 Morphological characterization of ZCO-ZO@C@CoS-6 (a, b) FESEM images; (c) TEM image; (d) HRTEM image; (e) Corresponding EDS elemental mappings

Fig. 2 Characterization of components and elemental valence states for composites (a) XRD patterns; (b) Total XPS spectrum; (c-f) High-resolution XPS spectra of (c) Zn2p, (d) O1s, (e) Co2p, and (f) S2p

Fig. 3 Electrochemical characterization of ZCO-ZO microspheres, ZCO-ZO@C and ZCO-ZO@C@CoS-6 composite electrodes (a) CV curves at a scan rate of 5 mV·s-1; (b) GCD curves at a current density of 2 A·g-1; (c) CV curves at various scan rates and (d) GCD curves at different current densities of ZCO-ZO@C@CoS-6 composite electrode; (e) Specific capacities at different current densities; (f) Nyquist plots with inset showing corresponding equivalent circuit Colorful figures are available on website

Fig. 4 Cycling performance of ZCO-ZO@C@CoS-6 electrode at 20 A·g-1 for 10000 cycles

Fig. 5 Electrochemical characterization of ZCO-ZO@C@CoS-3 and ZCO-ZO@C@CoS-9 composite electrodes (a, c) CV curves at various scan rates and (b, d) GCD curves at different current densities of (a, b) ZCO-ZO@C@CoS-3 and (c, d) ZCO-ZO@C@CoS-9 composite electrodes; (e) Specific capacities at different current densities; (f) Nyquist plots Colorful figures are available on website

Fig. 6 Quantitative capacitance analysis of ZCO-ZO@C@CoS-6 composite electrode (a) CV curves at low scanning rates; (b) Fitted b; (c) Capacitive and diffusive contributions at 0.2 mV·s-1 (grey: total capacity; green: pseudocapacity); (d) Percentage contributions to charge storage at different scan rates Colorful figures are available on website

Fig. 7 Electrochemical characterization of ZCO-ZO@C@CoS-6//AC ASC (a) CV curves of ZCO-ZO@C@CoS-6 and AC electrodes in two-electrode system at a constant scan rate of 5 mV·s-1; (b) CV curves at 10 mV·s-1 for different wide ranges of voltage windows; (c) CV curves at a constant voltage window, (d) GCD curves and (e) calculated specific capacities for the ASC device; (f) Ragone plots of this work in comparison with reported SCs Colorful figures are available on website

Fig. 8 Structure and mechanism diagram for ZCO-ZO@C@CoS-6//AC ASC

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ZnCo₂O₄-ZnO@C@CoS Core-shell Composite: Preparation and Application in Supercapacitors

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