Tuning electrochemical properties of carbon nanofiber electrodes with selenium heteroatoms for flexible zinc ion capacitors
The N-doping strategy is considered an effective method to regulate the electronic structure of carbon materials and improve their electrochemical performance. However, how to reasonably regulate the types of N-doping species remains a major challenge. Herein, we reported a self-supporting carbon na...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Tsinghua University Press
2024-12-01
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| Series: | Nano Research Energy |
| Subjects: | |
| Online Access: | https://www.sciopen.com/article/10.26599/NRE.2024.9120131 |
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| Summary: | The N-doping strategy is considered an effective method to regulate the electronic structure of carbon materials and improve their electrochemical performance. However, how to reasonably regulate the types of N-doping species remains a major challenge. Herein, we reported a self-supporting carbon nanofiber electrode codoped with N and Se (N/Se-CNF) for flexible zinc ion capacitor (ZIC). It was found that Se atoms can induce the reduction of Pyrrole-N, which is favorable for Zn ions transfer. Furthermore, ex-situ characterizations and theoretical density functional theory (DFT) calculations have shown that additional Se atoms can provide abundant reaction sites and reduce the adsorption energy of Zn ions. Accordingly, the N/Se-CNF electrode demonstrates impressive rate performance. The N/Se-CNF electrode shows impressive rate performance, retaining 60% capacitance at 20 A·g–1, with an energy density of 95.3 Wh·kg–1 and power density of 160.1 W·kg–1, and a commendable stability cycle, the capacitance retention is 88.1% after 18,000 cycles at a discharge rate of 5 A·g–1. Moreover, a flexible ZIC with N/Se-CNF electrode exhibits a high energy density of 68.8 Wh·kg–1 at 160 W·kg–1. This strategy innovatively regulates N-doping species and offers potential flexible electrodes for advanced energy storage devices. |
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| ISSN: | 2791-0091 2790-8119 |