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Revisiting N, S co-doped carbon materials with boosted electrochemical performance in sodium-ion capacitors: The manipulation of internal electric field
- Source :
- Nano Research Energy, Vol 3, Iss 1, p e9120098 (2024)
- Publication Year :
- 2024
- Publisher :
- Tsinghua University Press, 2024.
-
Abstract
- Heteroatom doping has emerged as a prevailing strategy to enhance the storage of sodium ions in carbon materials. However, the underlying mechanism governing the performance enhancement remains undisclosed. Herein, we fabricated N/S co-doped carbon beaded fibers (S-N-CBFs), which exhibited glorious rate performance and durableness in Na+ storage, showcasing no obvious capacity decay even after 3500 cycles. Furthermore, when used as anodes in sodium-ion capacitors, the S-N-CBFs delivered exceptional results, boasting a high energy density of 225 Wh·kg–1, superior power output of 22500 W·kg–1, and outstanding cycling stability with a capacity attenuation of merely 0.014% per cycle after 4000 cycles at 2 A·g–1. Mechanistic investigations revealed that the incorporation of both pyridinic N and pyrrolic N into the carbon matrix of S-N-CBFs induced internal electric fields (IEFs), with the former IEF being stronger than the latter, in conjunction with the doped S atom. Density functional theory calculations further unveiled that the intensity of the IEF directly influenced the adsorption of Na+, thereby resulting in the exceptional performances of S-N-CBFs as sodium-ion storage materials. This work uncovers the pivotal role of IEF in regulating the electronic structure of carbon materials and enhancing their Na+ storage capabilities, providing valuable insights for the development of more advanced electrode materials.
Details
- Language :
- English
- ISSN :
- 27910091 and 27908119
- Volume :
- 3
- Issue :
- 1
- Database :
- Directory of Open Access Journals
- Journal :
- Nano Research Energy
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.f982a980bb0f47dcb7309197b73b3e0a
- Document Type :
- article
- Full Text :
- https://doi.org/10.26599/NRE.2023.9120098