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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MDPI AG
2025-02-01
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| author | John Anthuvan Rajesh Sang-Jun Kwon Ramu Manikandan Soon-Hyung Kang Kwang-Soon Ahn |
| author_facet | John Anthuvan Rajesh Sang-Jun Kwon Ramu Manikandan Soon-Hyung Kang Kwang-Soon Ahn |
| author_sort | John Anthuvan Rajesh |
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| description | 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. |
| format | Article |
| id | doaj-art-55b31d93c6ae41ba9ae0e65ca7a86816 |
| institution | Kabale University |
| issn | 2073-4352 |
| language | English |
| publishDate | 2025-02-01 |
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| series | Crystals |
| spelling | doaj-art-55b31d93c6ae41ba9ae0e65ca7a868162025-08-20T03:43:36ZengMDPI AGCrystals2073-43522025-02-0115321710.3390/cryst15030217Design of Co<sub>0.85</sub>Se Microsphere-like Architectures for High-Performance Hybrid SupercapacitorsJohn Anthuvan Rajesh0Sang-Jun Kwon1Ramu Manikandan2Soon-Hyung Kang3Kwang-Soon Ahn4School of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of KoreaSchool of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of KoreaDepartment of Energy and Materials Engineering, Dongguk University-Seoul, Seoul 04620, Republic of KoreaDepartment of Chemistry Education, Chonnam National University, Gwangju 500-757, Republic of KoreaSchool of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of KoreaThis 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.https://www.mdpi.com/2073-4352/15/3/217Co<sub>0.85</sub>Se microsphereshydrothermalhybrid supercapacitorhigh energy density |
| spellingShingle | John Anthuvan Rajesh Sang-Jun Kwon Ramu Manikandan Soon-Hyung Kang Kwang-Soon Ahn Design of Co<sub>0.85</sub>Se Microsphere-like Architectures for High-Performance Hybrid Supercapacitors Crystals Co<sub>0.85</sub>Se microspheres hydrothermal hybrid supercapacitor high energy density |
| title | Design of Co<sub>0.85</sub>Se Microsphere-like Architectures for High-Performance Hybrid Supercapacitors |
| title_full | Design of Co<sub>0.85</sub>Se Microsphere-like Architectures for High-Performance Hybrid Supercapacitors |
| title_fullStr | Design of Co<sub>0.85</sub>Se Microsphere-like Architectures for High-Performance Hybrid Supercapacitors |
| title_full_unstemmed | Design of Co<sub>0.85</sub>Se Microsphere-like Architectures for High-Performance Hybrid Supercapacitors |
| title_short | Design of Co<sub>0.85</sub>Se Microsphere-like Architectures for High-Performance Hybrid Supercapacitors |
| title_sort | design of co sub 0 85 sub se microsphere like architectures for high performance hybrid supercapacitors |
| topic | Co<sub>0.85</sub>Se microspheres hydrothermal hybrid supercapacitor high energy density |
| url | https://www.mdpi.com/2073-4352/15/3/217 |
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