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J. Ahmad^a, Naeem-Ur-Rehman^a,*, M. Shakil^a, M. Saleem^a, K. Mahmood^b, A. Ali^b, M. Imran^c, S. Sharif^d, Hosam O. Elansary^e, S. Mumtaz^f, A. D. Khalid^g
Chalcogenide Letters, Vol.22, No.4, pp. 277-292, 2025, DOI:10.15251/CL.2025.224.277
Abstract This study highlights the superior electrochemical performance of Co₃O₄/Co₃S₄ composite nanoparticles for supercapacitors, compared to individual Co₃O₄ and Co₃S₄, synthesized using sol-gel, co-precipitation, and mechanical alloying methods. The composite combines pseudocapacitance and electric double-layer capacitance, as evidenced by cyclic voltammetry. It exhibits a specific capacitance of 722.9 F/g at 0.5 A/g and an energy density of 73.8 Wh/kg at 405 W/kg. Electrochemical impedance spectroscopy reveals low charge transfer resistance and excellent cycling stability is achieved, with 98.5% capacitance retention after 1500 cycles. These results confirm the composite's potential for high-performance energy storage applications. More >

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U. Anwar^a,, M. Rafi^b, N. A. Noor^c, S. Mumtaz^d,, Hosam O. Elansary^e
Chalcogenide Letters, Vol.22, No.4, pp. 293-311, 2025, DOI:10.15251/CL.2025.224.293
Abstract This study presents a multifunctional NiFe₂O₄@MoS₂ nanomaterial synthesized by co-precipitation and hydrothermal methods. The highly magnified Field emission scanning electron microscopic (FESEM) images expose an excellent interconnected network of MoS₂ petals and NiFe₂O₄ cores. NiFe₂O₄@MoS₂ nanomaterial's crystalline arrangement and phase purity are explored using X-ray diffraction (XRD) analysis. A comprehensive analysis of the NiFe₂O₄@MoS₂ nanomaterial, focusing on its dynamic electrical properties across a temperature zone of 183 K to 373 K. The temperature-dependent impedance and modulus plots versus frequency reveal insights into the material’s conduction and relaxation. Electrical characteristics verify the contribution of electroactive regions, such as grains… More >

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X. L. Guo^a, Y. F. Zhang^a,*, S. Y. Li^b, Q. Li^b, Q. Hao^c, X. Y. Ran^c, Y. M. Zhao^d
Chalcogenide Letters, Vol.22, No.4, pp. 313-330, 2025, DOI:10.15251/CL.2025.224.313
Abstract MoS₂ has excellent properties but low conductivity, limiting its use in supercapacitors. Carbon’s high conductivity and stability enhance MoS₂’s electrochemical performance and cycling stability. This study prepared MoS₂/C composites via a one-step hydrothermal method, exploring the effects of solvents and carbon content. Deionized water as a solvent resulted in composites with large specific surface areas and good electrochemical properties. Increasing carbon content improved electrochemical performance, peaking at a glucose content of 0.28 mmol, achieving a specific capacitance of 202.6 F/g. However, excessive carbon content led to decreased performance. More >

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O. Mekhbi^a, K. Kamli^b,*, Z. Hadef^b, O. Kamli^c, M. Bouatrous^d, N. Houaidji^e, L. Zighed^h
Chalcogenide Letters, Vol.22, No.4, pp. 331-339, 2025, DOI:10.15251/CL.2025.224.331
Abstract This work presents a hybrid study that employs Ultrasonic Spray method for the deposition of SnS absorber films and SCAPS-1D simulation method for the analysis of various solar cell topologies. Different deposition times have been employed to optimize structural, optics, and electrical properties. To evaluate their potential as absorber layers for solar cells, the films were analyzed by using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and tested for electrical performance. Complementary numerical simulations were carried out with SCAPS-1D in modeling ZnO:Al/i-ZnO/SnS₂/SnS solar cell structures. Results showed that optimized SnS thickness of 2.5 µm and high carrier More >

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A. Z. Mahmoud^a,b, L. G. Amin^c,*, S. A. Mahmoud^d, M. M. Bashier^e, M. E. M. Eisac^e, N. Dhahri^c, A. Mohamed^e, A. A. Al-Dumiri^c, S. E. I. Yagoub^c, M. A. Abdel-Rahim^b
Chalcogenide Letters, Vol.22, No.4, pp. 441-450, 2025, DOI:10.15251/CL.2025.224.441
Abstract The electrical and structural characteristics of Bi_xSe_100-x glasses (where x=5, 10, 15, and 25 at. %) were systematically investigated. Using the traditional Quenching of melts process, the amorphous Bi_xSe_100-x materials were created. Thin films of Bi_xSe_100-x have formed onto ultrasonically glass substrates that have been cleaned using thermal evaporation in a vacuum of approximately 10^-5 Torr. Here we show and discuss the results of four bulk glasses of Bi_xSe_100-x (where x=5, 10, 15, and 25 at. %) that were subjected to differential thermal analysis (DTA) under non-isothermal conditions. For the compositions under consideration, five separate methods were used More >

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