Carbon-bonded, oxygen-deficient TiO2 nanotubes with hybridized phases for superior Na-ion storage

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

21 Scopus Citations
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Author(s)

  • Chuanyong Zhao
  • Yi Cai
  • Kaili Yin
  • Haizhao Li
  • Ning Qin
  • Zhouguang Lu
  • Chaoping Liu
  • Hong-En Wang

Detail(s)

Original languageEnglish
Pages (from-to)201-208
Journal / PublicationChemical Engineering Journal
Volume350
Early online date1 Jun 2018
Publication statusPublished - 15 Oct 2018

Abstract

TiO2 shows great potential as anode materials for sodium-ion batteries (SIBs). However, its practical application has been deferred by the sluggish electronic/ionic transport. In this work, we report the controlled synthesis of ultrathin, carbon-bonded TiO2 nanotubes with oxygen vacancies (Vo) and hybridized amorphous/TiO2(B) phases via a hydrothermal reaction and heat-treatment. The introduction of Vo and carbon in TiO2 by C-Ti bonding effectively boosts its electron transport. Meantime, the ultrathin TiO2 nanotubes (with diameter of ∼10 nm and tube thickness of ∼3 nm) enable a large electrode/electrolyte contact interface with shortened Na+ diffusion distance. In addition, the formed coherent amorphous/TiO2(B) junctions further promote the charge transport and transfer at heterointerface. These synergic effects endow the resultant TiO2 material with superior Na+ storage capability in terms of high capacity (191 mA h/g at 0.2 C) and rate property (141 mA h/g at 10 C). Kinetics analysis further discloses a pseudocapacitive Na+ storage exerts a significant contribution to the total capacity. The proposed strategy based on synergic engineering of vacancy defects, chemical bonding and phase composition can pave the way for exploration of novel electrode materials for beyond lithium-ion batteries.

Research Area(s)

  • Chemical bonding, Oxygen vacancy, Pseudocapacitance, Sodium-ion batteries, Titanium dioxide

Citation Format(s)

Carbon-bonded, oxygen-deficient TiO2 nanotubes with hybridized phases for superior Na-ion storage. / Zhao, Chuanyong; Cai, Yi; Yin, Kaili; Li, Haizhao; Shen, Dong; Qin, Ning; Lu, Zhouguang; Liu, Chaoping; Wang, Hong-En.

In: Chemical Engineering Journal, Vol. 350, 15.10.2018, p. 201-208.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review