Nonignorable Influence of Oxygen in Hard Carbon for Sodium Ion Storage

Chen Chen, Ying Huang, Yade Zhu, Zheng Zhang, Zhaoxu Guang, Zhuoyue Meng, Panbo Liu

Research output: Contribution to journalArticlepeer-review

196 Scopus citations

Abstract

As an effective method, heteroatom doping is widely used to improve the electrochemical performance of carbon materials. However, the influence of oxygen-containing functional groups in carbon materials is often neglected. Therefore, we use buckwheat hulls as the precursor to prepare oxygen-doped hard carbon by simple carbonization. The buckwheat hull at a pyrolysis temperature of 1100 °C has the highest reversible capacity of 400 mA h g-1 at 50 mA g-1, and the capacity can maintain 96% of the initial capacity after 3000 cycles at 2A g-1. These results confirm that the natural pore structure and proper interlayer spacing of the BPC-1100 contribute to the transport and insertion of sodium ions. In addition, the first principle proves that the role of oxygen atoms cannot be ignored in the storage of sodium ions. In particular, the improvement of the C-O bond is helpful to improve the adsorption capacity of hard carbon to sodium ions and enhance the reversible capacitance.

Original languageEnglish
Pages (from-to)1497-1506
Number of pages10
JournalACS Sustainable Chemistry and Engineering
Volume8
Issue number3
DOIs
StatePublished - 27 Jan 2020

Keywords

  • anode
  • biomass-derived
  • hard carbon
  • oxygen-doped
  • sodium storage

Fingerprint

Dive into the research topics of 'Nonignorable Influence of Oxygen in Hard Carbon for Sodium Ion Storage'. Together they form a unique fingerprint.

Cite this