Tuning the nitrogen-doping configuration in carbon materials via sulfur doping for ultrastable potassium ion storage
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
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Pages (from-to) | 16150-16159 |
Journal / Publication | Journal of Materials Chemistry A |
Volume | 9 |
Issue number | 29 |
Online published | 28 Jun 2021 |
Publication status | Published - 7 Aug 2021 |
Link(s)
DOI | DOI |
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Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(6a9f4bc3-a4ad-459a-8e33-79eae69aae81).html |
Abstract
Nitrogen doping is a promising strategy to improve the potassium-storage performances of carbon materials. It is found that graphitic-N, pyridinic-N and pyrrolic-N always coexist in nitrogen-doped carbon materials prepared by typical synthesis techniques. However, graphitic-N is demonstrated to be unfavorable for the adsorption of potassium ions (K+). Therefore, achieving high-level nitrogen species of pyridinic-N and pyrrolic-N is still a big challenge. Herein, we successfully tune the nitrogen configuration and achieve high-level (85.0%) pyridinic-N and pyrrolic-N in nitrogen-doped carbon materials via sulfur doping. The resulting sulfur-doped nitrogen rich carbon materials (S/N-CMs) exhibit a high reversible capacity of 441.5 mA h g-1 over 100 cycles at 0.1 A g-1, superior rate capability (160.4 mA h g-1 at 5 A g-1), and long-term cycling stability (283.3 mA h g-1 after 1000 cycles at 2 A g-1). The potassium-storage performances are superior to those of most of the carbon materials for potassium ion batteries (KIBs). Density Functional Theory (DFT) calculations confirm that pyridinic-N and pyrrolic-N improve the adsorption ability of K+ in carbon materials, and sulfur doping can further improve the potassium-storage performances of nitrogen-doped carbon materials, synergistically ensuring high potassium-storage capacity and cycling stability for S/N-CMs.
Research Area(s)
- DOPED POROUS CARBON, HARD CARBON, ANODE, SODIUM
Citation Format(s)
Tuning the nitrogen-doping configuration in carbon materials via sulfur doping for ultrastable potassium ion storage. / Xu, Yang; Wang, Changlai; Niu, Ping; Li, Zhiqiang; Wei, Lingzhi; Yao, Ge; Zheng, Fangcai; Chen, Qianwang.
In: Journal of Materials Chemistry A, Vol. 9, No. 29, 07.08.2021, p. 16150-16159.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review