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Superior electrochemical performance of CuS/FeSe2 for advanced asymmetric supercapacitor applications
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Authors
Khan, Imran
Arif, Danish
Shah, Atta Ullah
Safeen, Kashif
Ali, Basit
Eid, Gh
Girma, Wubshet Mekonnen
Khan, Muhammad Shahid
Abid, Adeel Younas
Safeen, Akif
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en
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11
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Electrochemistry Communications, Volume 175
Abstract
Supercapacitor devices face significant challenges, including limited energy density, high self-discharge rates, and poor performance over extended cycling. The present study developed a high-performance asymmetric supercapacitor using novel CuS/FeSe2 nanocomposites fabricated using a scalable wet chemical method. The CuS/FeSe2 nanocomposites exhibited exceptional electrochemical performance, including significant capacitance and redox behavior improvements. Integrating two pseudocapacitive materials in a three-electrode configuration exhibited a synergistic effect, substantially reducing resistance and surpassing individual CuS and FeSe2 electrodes. The CuS/FeSe₂ nanocomposite demonstrated the highest Cs among the electrodes, achieving 821.3 Fg−1 at 1 Ag−1, surpassing the performance of the individual CuS (248.3 Fg−1) and FeSe₂ (508 Fg−1) electrodes along with 80.4 % retention. The asymmetric supercapacitor (CuS/FeSe2||AC) demonstrated excellent cycling stability, retaining 90.1 % of its initial capacity after 7000 continuous charge/discharge cycles at the highest current rate. Operating at a voltage cutoff of 1.6 V in an aqueous electrolyte, it achieved a high energy density of 51.1 Wh/kg, delivering power at 2426.3 W/kg, and exhibiting a specific capacitance of 143.6 F/g. The CuS/FeSe2 nanocomposite shows significant potential for high-performance energy storage devices, particularly for developing next-generation asymmetric supercapacitors.
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Publisher Copyright: © 2025 The Authors
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Khan, I, Arif, D, Shah, A U, Safeen, K, Ali, B, Eid, G, Girma, W M, Khan, M S, Abid, A Y & Safeen, A 2025, 'Superior electrochemical performance of CuS/FeSe 2 for advanced asymmetric supercapacitor applications', Electrochemistry Communications, vol. 175, 107915. https://doi.org/10.1016/j.elecom.2025.107915