Ultrastable Surface-Dominated Pseudocapacitive Potassium Storage Enabled by Edge-Enriched N-Doped Porous Carbon Nanosheets

Fei Xu, Yixuan Zhai, En Zhang, Qianhui Liu, Guangshen Jiang, Xiaosa Xu, Yuqian Qiu, Xiaoming Liu, Hongqiang Wang, Stefan Kaskel

Research output: Contribution to journalArticlepeer-review

176 Scopus citations

Abstract

The development of ultrastable carbon materials for potassium storage poses key limitations caused by the huge volume variation and sluggish kinetics. Nitrogen-enriched porous carbons have recently emerged as promising candidates for this application; however, rational control over nitrogen doping is needed to further suppress the long-term capacity fading. Here we propose a strategy based on pyrolysis–etching of a pyridine-coordinated polymer for deliberate manipulation of edge-nitrogen doping and specific spatial distribution in amorphous high-surface-area carbons; the obtained material shows an edge-nitrogen content of up to 9.34 at %, richer N distribution inside the material, and high surface area of 616 m2 g−1 under a cost-effective low-temperature carbonization. The optimized carbon delivers unprecedented K-storage stability over 6000 cycles with negligible capacity decay (252 mA h g−1 after 4 months at 1 A g−1), rarely reported for potassium storage.

Original languageEnglish
Pages (from-to)19460-19467
Number of pages8
JournalAngewandte Chemie - International Edition
Volume59
Issue number44
DOIs
StatePublished - 26 Oct 2020

Keywords

  • nitrogen doping
  • porous carbon
  • potassium storage
  • ultrastable cycling

Fingerprint

Dive into the research topics of 'Ultrastable Surface-Dominated Pseudocapacitive Potassium Storage Enabled by Edge-Enriched N-Doped Porous Carbon Nanosheets'. Together they form a unique fingerprint.

Cite this