Modulation of Crystal Surface and Lattice by Doping : Achieving Ultrafast Metal-Ion Insertion in Anatase TiO2

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

22 Scopus Citations
View graph of relations

Author(s)

  • Hsin-Yi Wang
  • Han-Yi Chen
  • Ying-Ya Hsu
  • Ulrich Stimming
  • Hao Ming Chen

Detail(s)

Original languageEnglish
Pages (from-to)29186-29193
Journal / PublicationACS Applied Materials and Interfaces
Volume8
Issue number42
Publication statusPublished - 26 Oct 2016
Externally publishedYes

Abstract

We report that an ultrafast kinetics of reversible metal-ion insertion can be realized in anatase titanium dioxide (TiO2). Niobium ions (Nb5+) were carefully chosen to dope and drive anatase TiO2 into very thin nanosheets standing perpendicularly onto transparent conductive electrode (TCE) and simultaneously construct TiO2 with an ion-conducting surface together with expanded ion diffusion channels, which enabled ultrafast metal ions to diffuse across the electrolyte/solid interface and into the bulk of TiO2. To demonstrate the superior metal-ion insertion rate, the electrochromic features induced by ion intercalation were examined, which exhibited the best color switching speed of 4.82 s for coloration and 0.91 s for bleaching among all reported nanosized TiO2 devices. When performed as the anode for the secondary battery, the modified TiO2 was capable to deliver a highly reversible capacity of 61.2 mAh/g at an ultrahigh specific current rate of 60 C (10.2 A/g). This fast metal-ion insertion behavior was systematically investigated by the well-controlled electrochemical approaches, which quantitatively revealed both the enhanced surface kinetics and bulk ion diffusion rate. Our study could provide a facile methodology to modulate the ion diffusion kinetics for metal oxides. © 2016 American Chemical Society.

Research Area(s)

  • doping modulation, lattice expansion, metal-ion diffusion, surface kinetics, TiO2 nanosheets

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Modulation of Crystal Surface and Lattice by Doping: Achieving Ultrafast Metal-Ion Insertion in Anatase TiO2. / Wang, Hsin-Yi; Chen, Han-Yi; Hsu, Ying-Ya et al.
In: ACS Applied Materials and Interfaces, Vol. 8, No. 42, 26.10.2016, p. 29186-29193.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review