Ag-decorated ZnCo2S4/SiO2 nanocomposite as a high-performance supercapacitor electrode

• Published in: Journal of alloys and compounds 2024-12, Vol.1009, p.176992, Article 176992
• Main Authors: Elbasiony, A.M., Abdelhamied, M.M., AbdElrahman, Mohamed, Amal M Said, Basmat, Awed, A.S.
• Format: Article
• Language: English
• Subjects: SiO2; Supercapacitor; ZnCo2S4
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2024.176992

Ag-decorated ZnCo2S4/SiO2 nanocomposite was utilized in this study as a potential supercapacitor electrode. Ag nanoparticles demonstrate a low level of pseudo-capacitance and their capacity to improve charge transfer. The specific capacitances of the ZnCo2S4, ZnCo2S4/SiO2, and Ag@ZnCo2S4/SiO2 electrodes were 935, 1066, and 1623 Fg−1, respectively, at 1 Ag−1 current density. The Ag@ZnCo2S4/SiO2 electrode exhibits remarkable cycle stability (100 % coulombic efficiency and capacitance retention of approximately 91.7 % at 10 A g−1 after 10,000 cycles). Furthermore, the symmetric supercapacitor (Ag@ZnCo2S4/SiO2//Ag@ZnCo2S4/SiO2) possesses a broad potential window of 1.5 V, a maximal energy density of 68.6 Whkg−1, and a specific power of 23.88 kWkg−1. Furthermore, the hybrid supercapacitor device (Ag@ZnCo2S4/SiO2//Ag@ZnCo2S4/SiO2) demonstrated a coulombic efficiency of 100 % and a capacitance retention of 92.3 %. Consequently, the Ag@ZnCo2S4/SiO2 composite electrode was suitable for high-energy supercapacitors due to their high capacitance, remarkable cycle stability, and high energy density. •Ag-decorated ZnCo2S4/SiO2 nanocomposite was utilized as a potential supercapacitor electrode.•The Ag@ZnCo2S4/SiO2 electrode displays a high specific capacitance of 1623 Fg-1.•The symmetric device gives the highest specific energy density of 23.88 kWkg-1 with a specific power of 68.6 Whkg-1.•The hybrid device retains roughly 92.3 % and exhibited approximately 100 % coulombic efficiency after 6000 cycles.