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 journalpeer-review

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Author(s)

  • Yang Xu
  • Changlai Wang
  • Ping Niu
  • Zhiqiang Li
  • Lingzhi Wei
  • And 3 others
  • Ge Yao
  • Fangcai Zheng
  • Qianwang Chen

Detail(s)

Original languageEnglish
Pages (from-to)16150-16159
Journal / PublicationJournal of Materials Chemistry A
Volume9
Issue number29
Online published28 Jun 2021
Publication statusPublished - 7 Aug 2021

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 journalpeer-review