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Developing a CeS2/ZnS Quantum Dot Composite Nanomaterial as a High-Performance Cathode Material for Supercapacitor

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Publicat a:Batteries vol. 11, no. 8 (2025), p. 289-305
Autor principal: Shan-Diao, Xu
Altres autors: Li-Cheng, Wu, Muhammad, Adil, Lin-Feng, Sheng, Zi-Yue, Zhao, Xu, Kui, Chen, Xin
Publicat:
MDPI AG
Matèries:
Hitachi Ltd
Shanghai China
China
Japan
Nitrates
Electrodes
Nanocomposites
Zinc
Electrode materials
Nanoparticles
Ratios
Rare earth elements
Capacitance
Energy storage
Activated carbon
Composite materials
Scanning electron microscopy
Cerium
Ion diffusion
Zinc sulfide
Carbon black
Electrolytes
Electrochemical analysis
Electron microscopy
Alternative energy
Supercapacitors
Synergistic effect
Stainless steel
Quantum dots
Glutathione
Morphology
Nanomaterials
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Resum:To develop high-performance electrode materials for supercapacitors, in this paper, a heterostructured composite material of cerium sulfide and zinc sulfide quantum dots (CeS2/ZnS QD) was successfully prepared by hydrothermal method. Characterization through scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM) showed that ZnS QD nanoparticles were uniformly composited with CeS2, effectively increasing the active sites surface area and shortening the ion diffusion path. Electrochemical tests show that the specific capacitance of this composite material reaches 2054 F/g at a current density of 1 A/g (specific capacity of about 256 mAh/g), significantly outperforming the specific capacitance of pure CeS2 787 F/g at 1 A/g (specific capacity 98 mAh/g). The asymmetric supercapacitor (ASC) assembled with CeS2/ZnS QD and activated carbon (AC) retained 84% capacitance after 10,000 charge–discharge cycles. Benefited from the synergistic effect between CeS2 and ZnS QDs, the significantly improved electrochemical performance of the composite material suggests a promising strategy for designing rare-earth and QD-based advanced energy storage materials.
ISSN:2313-0105
DOI:10.3390/batteries11080289
Font:Advanced Technologies & Aerospace Database