Design of Co<sub>0.85</sub>Se Microsphere-like Architectures for High-Performance Hybrid Supercapacitors

Design of Co<sub>0.85</sub>Se Microsphere-like Architectures for High-Performance Hybrid Supercapacitors

This study presents the synthesis of Co<sub>0.85</sub>Se microsphere-like structures on nickel foam (NF) substrates for high-performance HSC applications. The Co<sub>0.85</sub>Se microspheres were synthesized using a two-step hydrothermal process, yielding well-distributed—al...

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Bibliographic Details
Main Authors: John Anthuvan Rajesh, Sang-Jun Kwon, Ramu Manikandan, Soon-Hyung Kang, Kwang-Soon Ahn
Format: Article
Language:English
Published: MDPI AG 2025-02-01
Series:Crystals
Subjects:
Co<sub>0.85</sub>Se microspheres
hydrothermal
hybrid supercapacitor
high energy density
Online Access:https://www.mdpi.com/2073-4352/15/3/217
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Summary:This study presents the synthesis of Co<sub>0.85</sub>Se microsphere-like structures on nickel foam (NF) substrates for high-performance HSC applications. The Co<sub>0.85</sub>Se microspheres were synthesized using a two-step hydrothermal process, yielding well-distributed—albeit non-uniform—structures on the NF substrate. The electrochemical performance of the Co<sub>0.85</sub>Se/NF electrode, evaluated in a three-electrode system, demonstrated remarkable characteristics, including a high specific capacity of 719 C g<sup>−</sup>¹ at 1 A g⁻¹ and outstanding long-term cycling stability, with 87.1% capacity retention over 10,000 charge-discharge cycles. To assess the practical applicability of the Co<sub>0.85</sub>Se/NF electrode, a hybrid supercapacitor device was assembled using activated carbon (AC) as the negative electrode and Co<sub>0.85</sub>Se/NF as the positive electrode. The Co<sub>0.85</sub>Se/NF//AC HSC device exhibited remarkable electrochemical performance, achieving a high energy density of 66.6 Wh kg⁻¹ at a power density of 849.3 W kg⁻¹. It also maintained excellent cycling stability over 10,000 charge-discharge cycles. These findings highlight the significant potential of Co<sub>0.85</sub>Se microsphere-like structures as high-performance electrode materials for hybrid supercapacitors, paving the way for developing efficient energy storage technologies.
ISSN:2073-4352

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