Ultrahigh Nitrogen Doping of Carbon Nanosheets for High Capacity and Long Cycling Potassium Ion Storage

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

34 Scopus Citations
View graph of relations

Author(s)

  • Xingqi Chang
  • Xiaolong Zhou
  • Xuewu Ou
  • Jiwei Zhou
  • Yongbing Tang

Detail(s)

Original languageEnglish
Article number1902672
Journal / PublicationAdvanced Energy Materials
Volume9
Issue number47
Online published19 Nov 2019
Publication statusPublished - 20 Dec 2019

Abstract

Potassium-based energy storage devices (PESDs) are promising candidates for large-scale energy storage applications owing to potassiums abundant in nature, the low standard redox potential (−2.93 V for K/K+ vs the standard hydrogen electrode) of potassium (K), and high ionic conductivity of K-ion based electrolytes. However, lack of proper cathode and anode materials hinder practical applications of PESDs. In this work, carbon nanosheets doped with an ultrahigh content of nitrogen (22.7 at%) are successfully synthesized as an anode material for a K-ion battery, which delivers a high capacity of 410 mAh g−1 at a current density of 500 mA g−1, which is the best result among the carbon based anodes for PESDs. Moreover, the battery exhibits an excellent cycling performance with a capacity retention of 70% after 3000 cycles at a high current density of 5 A g−1. In situ Raman, galvanostatic intermittent titration, and density functional theory calculations reveal that the ultrahigh N-doped carbon nanosheet (UNCN) simultaneously combines the diffusion and pseudocapacitive mechanisms together, which remarkably improves its electrochemical performances in K-ion storage. These results demonstrate the good potential of UNCNs as a high-performance anode for PESDs.

Research Area(s)

  • carbon nanosheets, high capacity, long cycling, potassium ion storage, ultrahigh nitrogen doping

Citation Format(s)

Ultrahigh Nitrogen Doping of Carbon Nanosheets for High Capacity and Long Cycling Potassium Ion Storage. / Chang, Xingqi; Zhou, Xiaolong; Ou, Xuewu; Lee, Chun-Sing; Zhou, Jiwei; Tang, Yongbing.

In: Advanced Energy Materials, Vol. 9, No. 47, 1902672, 20.12.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal