Dual surface/bulk engineering of Nb2O5 for high‐rate sodium storage
Abstract Orthorhombic Nb2O5 is a highly promising fast‐charging anode material for sodium‐ion capacitors. However, its poor intrinsic electronic/ionic conductivity limits its performance. Here, we developed a one‐step heat treatment method to create an N‐doped carbon coating on the outside and S‐dop...
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Wiley
2023-11-01
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| Series: | Electron |
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| Online Access: | https://doi.org/10.1002/elt2.15 |
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| author | Yingjun Jiang Xianluo Hu |
| author_facet | Yingjun Jiang Xianluo Hu |
| author_sort | Yingjun Jiang |
| collection | DOAJ |
| description | Abstract Orthorhombic Nb2O5 is a highly promising fast‐charging anode material for sodium‐ion capacitors. However, its poor intrinsic electronic/ionic conductivity limits its performance. Here, we developed a one‐step heat treatment method to create an N‐doped carbon coating on the outside and S‐doped Nb2O5 on the inside (CN‐SCN). Ionic liquids are used as the source of C/N/S, which synergistically enhance the surface and bulk electronic/ionic conductivity. The N‐doped carbon coating on the surface exhibits excellent electronic conductivity and a low ion‐diffusion barrier, thanks to the high nitrogen ratio and extremely low content (<2 wt%). Auger electron spectroscopy analysis confirms that S atoms detach from the carbon chain of the ionic liquids and enter the bulk Nb2O5, resulting in S‐doped Nb2O5, significantly facilitating reaction kinetics. The CN‐SCN electrodes exhibit outstanding rate capability, achieving a capacity of up to 94 mAh g−1 even at a high current rate of 50 C. When paired with activated carbon as the positive electrode, the sodium‐ion capacitor with the CN‐SCN anode exhibits a high‐energy density of up to 59 Wh kg−1 and a long cycle life with 73% capacity retention after 10,000 cycles. This work opens up possibilities for low‐cost and large‐scale production of high‐rate Nb2O5 for sodium‐storage applications. |
| format | Article |
| id | doaj-art-83cf1d2f6c1f4a60bcdf8ece01a37ecb |
| institution | OA Journals |
| issn | 2751-2606 2751-2614 |
| language | English |
| publishDate | 2023-11-01 |
| publisher | Wiley |
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| series | Electron |
| spelling | doaj-art-83cf1d2f6c1f4a60bcdf8ece01a37ecb2025-08-20T02:36:38ZengWileyElectron2751-26062751-26142023-11-0112n/an/a10.1002/elt2.15Dual surface/bulk engineering of Nb2O5 for high‐rate sodium storageYingjun Jiang0Xianluo Hu1State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan ChinaState Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan ChinaAbstract Orthorhombic Nb2O5 is a highly promising fast‐charging anode material for sodium‐ion capacitors. However, its poor intrinsic electronic/ionic conductivity limits its performance. Here, we developed a one‐step heat treatment method to create an N‐doped carbon coating on the outside and S‐doped Nb2O5 on the inside (CN‐SCN). Ionic liquids are used as the source of C/N/S, which synergistically enhance the surface and bulk electronic/ionic conductivity. The N‐doped carbon coating on the surface exhibits excellent electronic conductivity and a low ion‐diffusion barrier, thanks to the high nitrogen ratio and extremely low content (<2 wt%). Auger electron spectroscopy analysis confirms that S atoms detach from the carbon chain of the ionic liquids and enter the bulk Nb2O5, resulting in S‐doped Nb2O5, significantly facilitating reaction kinetics. The CN‐SCN electrodes exhibit outstanding rate capability, achieving a capacity of up to 94 mAh g−1 even at a high current rate of 50 C. When paired with activated carbon as the positive electrode, the sodium‐ion capacitor with the CN‐SCN anode exhibits a high‐energy density of up to 59 Wh kg−1 and a long cycle life with 73% capacity retention after 10,000 cycles. This work opens up possibilities for low‐cost and large‐scale production of high‐rate Nb2O5 for sodium‐storage applications.https://doi.org/10.1002/elt2.15fast reaction kineticsionic liquidsorthorhombic Nb2O5sodium‐ion capacitors |
| spellingShingle | Yingjun Jiang Xianluo Hu Dual surface/bulk engineering of Nb2O5 for high‐rate sodium storage Electron fast reaction kinetics ionic liquids orthorhombic Nb2O5 sodium‐ion capacitors |
| title | Dual surface/bulk engineering of Nb2O5 for high‐rate sodium storage |
| title_full | Dual surface/bulk engineering of Nb2O5 for high‐rate sodium storage |
| title_fullStr | Dual surface/bulk engineering of Nb2O5 for high‐rate sodium storage |
| title_full_unstemmed | Dual surface/bulk engineering of Nb2O5 for high‐rate sodium storage |
| title_short | Dual surface/bulk engineering of Nb2O5 for high‐rate sodium storage |
| title_sort | dual surface bulk engineering of nb2o5 for high rate sodium storage |
| topic | fast reaction kinetics ionic liquids orthorhombic Nb2O5 sodium‐ion capacitors |
| url | https://doi.org/10.1002/elt2.15 |
| work_keys_str_mv | AT yingjunjiang dualsurfacebulkengineeringofnb2o5forhighratesodiumstorage AT xianluohu dualsurfacebulkengineeringofnb2o5forhighratesodiumstorage |