The synergistic effect of P-doping and carbon coating for boosting electrochemical performance of TiO2 nanospheres for sodium-ion batteries

Zixing Guan, Kaixiang Zou, Xiao Wang, Yuanfu Deng, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

P-doping is an effective way to modulate the electronic structure and improve the Na+ diffusion kinetics of TiO2, enabling enhanced electrochemical performance. However, it is a challenge to prepare TiO2 with a high P-doping concentration starting from TiO2 in a crystalline state. In this work, we design a novel two-step route for constructing a carbon-coated anatase P-doping TiO2 nanospheres (denote as (P-AnTSS)@NC) with high P-doping concentration, by utilizing amorphous TiO2 nanospheres with the ultra-high specific area as P-doping precursor firstly, and followed by carbon coating treatment. Experimental results demonstrate that P is successfully doped into the crystal lattice and carbon layer is well coated on the surface of TiO2, with P-doping and carbon-coating contents of ~ 13.5 wt% and 10.4 wt%, respectively, which results in the enhanced pseudocapacitive behavior as well as favorable Na+ and electron transferring kinetics. The (P-AnTSS)@NC sample shows excellent rate and cycle performance, exhibiting specific capacities of 177 and 115 mAh/g at 0.1 and 1.0 A/g after 150 and 2000 cycles, respectively

Original languageEnglish
JournalChinese Chemical Letters
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Anode material
  • Carbon coating layer
  • Phosphorus-doping
  • Sodium-ion batteries
  • TiO

ASJC Scopus subject areas

  • Chemistry(all)

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