Nitrogen-enriched hierarchical porous carbon with enhanced performance in supercapacitors and lithium-sulfur batteries

Xiaoliang Yu, Jianfeng Zhao, Ruitao Lv, Qinghua Liang, Yu Bai, Zheng Hong Huang, Wanci Shen, Feiyu Kang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)

Abstract

It is quite desirable but challenging to prepare highly active materials for various energy storage applications at low cost. Here, an efficient strategy to produce nitrogen-enriched hierarchical porous carbon (N-HPC) is reported by facile pyrolysis of magnesium citrate and subsequent NH3 treatment. As-prepared N-HPC presents a developed hierarchical micro- and trimodal meso-porosity with a high specific surface area of 1290 m2 g-1 and pore volume of 3.04 cm3 g-1. It also shows an abundant nitrogen doping of 3.6%. When used for electrochemical electrodes in supercapacitors and lithium-sulfur (Li-S) batteries, significantly enhanced performances have been obtained compared with commercially available activated carbon. In supercapacitor testing, the N-HPC electrode shows a specific capacitance of 101 F g-1 in a nonaqueous electrolyte. And the capacitance retains 67% even at a 200-fold charge/discharge rate. Moreover, its performance in Li-S batteries is more outstanding. It enables a very high sulfur loading (76.2% by weight) and the resulting N-HPC/S cathode shows high discharge capacities of 1153 mA h g-1sulfur (or 702 mA h g-1electrode) at 0.2C and 671 mA h g-1 even at 4C. And it still remains 600 mA h g-1 over 300 charge/discharge cycles at 1C with an average coulombic efficiency of 99.0%.

Original languageEnglish
Pages (from-to)75403-75410
Number of pages8
JournalRSC Advances
Volume5
Issue number92
DOIs
Publication statusPublished - 28 Aug 2015
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this