Controllable Ni-doping and conformal NiO coating of porous flower-like VO2 clusters for high-performance symmetric supercapacitors
With the growing demand for high-performance energy storage devices, vanadium dioxide (VO2) has been emerged as a promising electrode material for supercapacitors due to its unique physicochemical properties and abundant resources. However, the intercalation-pseudocapacitive mechanism and solubility...
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| Language: | English |
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Elsevier
2025-07-01
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| Series: | Next Energy |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949821X25000675 |
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| author | Mingxing Zhang Huang Zhang Yu Li Fan Wang Huihua Li Jiawei Zhang Minghua Chen |
| author_facet | Mingxing Zhang Huang Zhang Yu Li Fan Wang Huihua Li Jiawei Zhang Minghua Chen |
| author_sort | Mingxing Zhang |
| collection | DOAJ |
| description | With the growing demand for high-performance energy storage devices, vanadium dioxide (VO2) has been emerged as a promising electrode material for supercapacitors due to its unique physicochemical properties and abundant resources. However, the intercalation-pseudocapacitive mechanism and solubility in aqueous electrolytes present challenges to achieving high specific capacitance and cycling stability. This study demonstrates a synergetic modification strategy by introducing nickel dopants and a protective NiO layer to enhance the performance of VO2 electrode materials via a solvothermal method combined with atomic layer deposition (ALD) technology. The synergistic effect of nickel doping ratio and NiO layer thickness on electrochemical performance is systematically investigated. Results show that nickel doping significantly improves the conductivity and activates additional electrochemical sites, enhancing both rate capability and specific capacitance. The conformal NiO layer coating effectively mitigates the VO2 dissolution, leading to improved cycling stability. A quasi-solid-state symmetric supercapacitor using the optimized Ni-VO2@NiO200 composite electrodes delivers a maximum energy density of 4.03 Wh kg−1 and maintains 72.8% capacitance retention after 2500 cycles, significantly outperforming pristine VO2. These findings demonstrate the feasibility of VO2 with structural modification as a high-performance electrode material for supercapacitors, offering valuable insights for future material design in electrochemical energy storage applications. |
| format | Article |
| id | doaj-art-eb2d6deb19f142cdbb1ec6f3933ffc74 |
| institution | DOAJ |
| issn | 2949-821X |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Next Energy |
| spelling | doaj-art-eb2d6deb19f142cdbb1ec6f3933ffc742025-08-20T03:13:29ZengElsevierNext Energy2949-821X2025-07-01810030410.1016/j.nxener.2025.100304Controllable Ni-doping and conformal NiO coating of porous flower-like VO2 clusters for high-performance symmetric supercapacitorsMingxing Zhang0Huang Zhang1Yu Li2Fan Wang3Huihua Li4Jiawei Zhang5Minghua Chen6Key Laboratory of Engineering Dielectric and Applications (Ministry of Education), School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, P R ChinaCorresponding authors.; Key Laboratory of Engineering Dielectric and Applications (Ministry of Education), School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, P R ChinaKey Laboratory of Engineering Dielectric and Applications (Ministry of Education), School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, P R ChinaKey Laboratory of Engineering Dielectric and Applications (Ministry of Education), School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, P R ChinaKey Laboratory of Engineering Dielectric and Applications (Ministry of Education), School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, P R ChinaCorresponding authors.; Key Laboratory of Engineering Dielectric and Applications (Ministry of Education), School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, P R ChinaKey Laboratory of Engineering Dielectric and Applications (Ministry of Education), School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, P R ChinaWith the growing demand for high-performance energy storage devices, vanadium dioxide (VO2) has been emerged as a promising electrode material for supercapacitors due to its unique physicochemical properties and abundant resources. However, the intercalation-pseudocapacitive mechanism and solubility in aqueous electrolytes present challenges to achieving high specific capacitance and cycling stability. This study demonstrates a synergetic modification strategy by introducing nickel dopants and a protective NiO layer to enhance the performance of VO2 electrode materials via a solvothermal method combined with atomic layer deposition (ALD) technology. The synergistic effect of nickel doping ratio and NiO layer thickness on electrochemical performance is systematically investigated. Results show that nickel doping significantly improves the conductivity and activates additional electrochemical sites, enhancing both rate capability and specific capacitance. The conformal NiO layer coating effectively mitigates the VO2 dissolution, leading to improved cycling stability. A quasi-solid-state symmetric supercapacitor using the optimized Ni-VO2@NiO200 composite electrodes delivers a maximum energy density of 4.03 Wh kg−1 and maintains 72.8% capacitance retention after 2500 cycles, significantly outperforming pristine VO2. These findings demonstrate the feasibility of VO2 with structural modification as a high-performance electrode material for supercapacitors, offering valuable insights for future material design in electrochemical energy storage applications.http://www.sciencedirect.com/science/article/pii/S2949821X25000675Vanadium dioxideNickel dopingAtomic layer depositionSupercapacitor |
| spellingShingle | Mingxing Zhang Huang Zhang Yu Li Fan Wang Huihua Li Jiawei Zhang Minghua Chen Controllable Ni-doping and conformal NiO coating of porous flower-like VO2 clusters for high-performance symmetric supercapacitors Next Energy Vanadium dioxide Nickel doping Atomic layer deposition Supercapacitor |
| title | Controllable Ni-doping and conformal NiO coating of porous flower-like VO2 clusters for high-performance symmetric supercapacitors |
| title_full | Controllable Ni-doping and conformal NiO coating of porous flower-like VO2 clusters for high-performance symmetric supercapacitors |
| title_fullStr | Controllable Ni-doping and conformal NiO coating of porous flower-like VO2 clusters for high-performance symmetric supercapacitors |
| title_full_unstemmed | Controllable Ni-doping and conformal NiO coating of porous flower-like VO2 clusters for high-performance symmetric supercapacitors |
| title_short | Controllable Ni-doping and conformal NiO coating of porous flower-like VO2 clusters for high-performance symmetric supercapacitors |
| title_sort | controllable ni doping and conformal nio coating of porous flower like vo2 clusters for high performance symmetric supercapacitors |
| topic | Vanadium dioxide Nickel doping Atomic layer deposition Supercapacitor |
| url | http://www.sciencedirect.com/science/article/pii/S2949821X25000675 |
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