AI Insight
Researchers synthesized a MoO3/MnS nanocomposite via hydrothermal method and evaluated its performance as a supercapacitor electrode material in aqueous KCl and Na2SO4 electrolytes. The incorporation of MnS nanoparticles transformed MoO3 morphology from nanobelts to nanofibers, created surface defects, and expanded the interlayer spacing from 0.396 nm to 0.421 nm, collectively enhancing ion accessibility. The composite achieved a specific capacitance of 387 F g-1 in KCl at 0.3 A g-1, an energy density of 33.37 Wh kg-1, and retained 90% of its capacitance after 1000 charge-discharge cycles.
Why it matters
These results suggest that defect engineering in metal oxide/sulfide composites is a viable strategy for developing cost-effective, high-performance supercapacitor electrodes, with potential applications in portable electronics, hybrid vehicles, and renewable energy storage systems.
by Mizanur Rahaman, Mehedi Hasan Prince, Saif Mahmud Bijoy, Zakaria Siddiquee, Muhammad Rakibul Islam
Electrode materials play a crucial role in improving supercapacitor performance. In this work, MnS nanoparticles were incorporated into MoO3 to form a MoO3/MnS nanocomposite via hydrothermal synthesis, and the capacitive performance of the resulting supercapacitor electrodes was evaluated. Their electrochemical performances were studied in conjunction with KCl and Na2SO4 electrolytes. The generation of MoO3/MnS nanocomposite was confirmed by XRD analysis and HR-TEM imaging. It is found that the MnS nanoparticles altered the morphology of MoO3 from nanobelts to nanofibers and produced a defective, rough surface. The defective surface expanded the interlayer distance from 0.396 nm to 0.421 nm. In both ionic electrolytes, the MoO3/MnS composite demonstrated higher capacitive performance than the pristine MoO3. At 0.3 A g-1 current density, the estimated specific capacitance of MoO3/MnS was 387 F g-1 and 335 F g-1 in KCl and Na2SO4 electrolytes, respectively. In the symmetric two-electrode system, the MoO3/MnS shows a specific capacitance of 297 F g−1 at 1 A g−1, with an energy density of 33.37 Wh kg−1 and a power density of 450 W kg−1. The MoO3/MnS nanocomposite provides excellent 90% retention after 1000 continuous charging-discharging cyclic. The enhancement of electrochemical performance is attributed to the large surface area, defective morphology, and broader interlayer distance. This system bridges the gap between traditional batteries and capacitors, offering a unique approach to producing supercapacitor electrodes.