Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry
Abstract Aqueous Zn-ion hybrid supercapacitors (ZHSs) are increasingly being studied as a novel electrochemical energy storage system with prominent electrochemical performance, high safety and low cost. Herein, high-energy and anti-self-discharge ZHSs are realized based on the fibrous carbon cathod...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-03-01
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| Series: | Nano-Micro Letters |
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| Online Access: | https://doi.org/10.1007/s40820-021-00625-3 |
| _version_ | 1818616086043557888 |
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| author | Yang Li Wang Yang Wu Yang Ziqi Wang Jianhua Rong Guoxiu Wang Chengjun Xu Feiyu Kang Liubing Dong |
| author_facet | Yang Li Wang Yang Wu Yang Ziqi Wang Jianhua Rong Guoxiu Wang Chengjun Xu Feiyu Kang Liubing Dong |
| author_sort | Yang Li |
| collection | DOAJ |
| description | Abstract Aqueous Zn-ion hybrid supercapacitors (ZHSs) are increasingly being studied as a novel electrochemical energy storage system with prominent electrochemical performance, high safety and low cost. Herein, high-energy and anti-self-discharge ZHSs are realized based on the fibrous carbon cathodes with hierarchically porous surface and O/N heteroatom functional groups. Hierarchically porous surface of the fabricated free-standing fibrous carbon cathodes not only provides abundant active sites for divalent ion storage, but also optimizes ion transport kinetics. Consequently, the cathodes show a high gravimetric capacity of 156 mAh g−1, superior rate capability (79 mAh g−1 with a very short charge/discharge time of 14 s) and exceptional cycling stability. Meanwhile, hierarchical pore structure and suitable surface functional groups of the cathodes endow ZHSs with a high energy density of 127 Wh kg−1, a high power density of 15.3 kW kg−1 and good anti-self-discharge performance. Mechanism investigation reveals that ZHS electrochemistry involves cation adsorption/desorption and Zn4SO4(OH)6·5H2O formation/dissolution at low voltage and anion adsorption/desorption at high voltage on carbon cathodes. The roles of these reactions in energy storage of ZHSs are elucidated. This work not only paves a way for high-performance cathode materials of ZHSs, but also provides a deeper understanding of ZHS electrochemistry. |
| first_indexed | 2024-12-16T16:44:12Z |
| format | Article |
| id | doaj.art-018d4d6fd5b54d7baeccd913dcf696a2 |
| institution | Directory Open Access Journal |
| issn | 2311-6706 2150-5551 |
| language | English |
| last_indexed | 2024-12-16T16:44:12Z |
| publishDate | 2021-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Nano-Micro Letters |
| spelling | doaj.art-018d4d6fd5b54d7baeccd913dcf696a22022-12-21T22:24:13ZengSpringerOpenNano-Micro Letters2311-67062150-55512021-03-0113111610.1007/s40820-021-00625-3Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the ElectrochemistryYang Li0Wang Yang1Wu Yang2Ziqi Wang3Jianhua Rong4Guoxiu Wang5Chengjun Xu6Feiyu Kang7Liubing Dong8College of Chemistry and Materials Science, Jinan UniversityCentre for Clean Energy Technology, University of Technology SydneyCentre for Clean Energy Technology, University of Technology SydneyCollege of Chemistry and Materials Science, Jinan UniversityCollege of Chemistry and Materials Science, Jinan UniversityCentre for Clean Energy Technology, University of Technology SydneyTsinghua Shenzhen International Graduate School, Tsinghua UniversityTsinghua Shenzhen International Graduate School, Tsinghua UniversityCollege of Chemistry and Materials Science, Jinan UniversityAbstract Aqueous Zn-ion hybrid supercapacitors (ZHSs) are increasingly being studied as a novel electrochemical energy storage system with prominent electrochemical performance, high safety and low cost. Herein, high-energy and anti-self-discharge ZHSs are realized based on the fibrous carbon cathodes with hierarchically porous surface and O/N heteroatom functional groups. Hierarchically porous surface of the fabricated free-standing fibrous carbon cathodes not only provides abundant active sites for divalent ion storage, but also optimizes ion transport kinetics. Consequently, the cathodes show a high gravimetric capacity of 156 mAh g−1, superior rate capability (79 mAh g−1 with a very short charge/discharge time of 14 s) and exceptional cycling stability. Meanwhile, hierarchical pore structure and suitable surface functional groups of the cathodes endow ZHSs with a high energy density of 127 Wh kg−1, a high power density of 15.3 kW kg−1 and good anti-self-discharge performance. Mechanism investigation reveals that ZHS electrochemistry involves cation adsorption/desorption and Zn4SO4(OH)6·5H2O formation/dissolution at low voltage and anion adsorption/desorption at high voltage on carbon cathodes. The roles of these reactions in energy storage of ZHSs are elucidated. This work not only paves a way for high-performance cathode materials of ZHSs, but also provides a deeper understanding of ZHS electrochemistry.https://doi.org/10.1007/s40820-021-00625-3Zn-ion hybrid supercapacitorCarbon materialFibrous cathodeHierarchical pore structureHigh-energy |
| spellingShingle | Yang Li Wang Yang Wu Yang Ziqi Wang Jianhua Rong Guoxiu Wang Chengjun Xu Feiyu Kang Liubing Dong Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry Nano-Micro Letters Zn-ion hybrid supercapacitor Carbon material Fibrous cathode Hierarchical pore structure High-energy |
| title | Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry |
| title_full | Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry |
| title_fullStr | Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry |
| title_full_unstemmed | Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry |
| title_short | Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry |
| title_sort | towards high energy and anti self discharge zn ion hybrid supercapacitors with new understanding of the electrochemistry |
| topic | Zn-ion hybrid supercapacitor Carbon material Fibrous cathode Hierarchical pore structure High-energy |
| url | https://doi.org/10.1007/s40820-021-00625-3 |
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