TCNQ-derived N/S dual-doped carbon cube electrocatalysts with built-in CoS2 nanoparticles for high-rate lithium-oxygen batteries

Yoon Seon Kim, Gwang Hee Lee, Bobae Ju, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Nitrogen/Sulfur dual-doped carbon cubes with built-in CoS2 nanoparticles (CoS2@NS-C cubes) as an electrocatalyst are developed to improve the high-rate and long-term performance of lithium-oxygen batteries. The CoS2@NS-C cubes were synthesized by coprecipitation between a cobalt salt and 7,7,8,8-tetracyanoquinodimethane (TCNQ) and subsequent thermal sulfidation. TCNQ acted as the coordination polymer for a cube shape and as the nitrogen source for nitrogen-dopants. The CoS2@NS-C cubes comprise uniformly distributed CoS2 nanoparticles in a nitrogen/sulfur dual-doped carbon matrix, providing fast catalytic activity for oxygen reduction/evolution reactions. The CoS2@NS-C cubes exhibited a high-rate performance of 5000 mA g−1 as well as long-term performance of > 100 cycles with a current density of 2000 mA g−1. These results confirmed the enhanced performance of the lithium-oxygen battery, with fast charging capability.

Original languageEnglish
Article number129367
JournalChemical Engineering Journal
Volume418
DOIs
Publication statusPublished - 2021 Aug 15

Keywords

  • CoS
  • Electrocatalysts
  • Fast charge
  • Lithium-oxygen battery
  • Nitrogen/sulfur dual-doped carbon
  • TCNQ

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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