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

Hsin Yi Wang, Han Yi Chen, Ying Ya Hsu, Ulrich Stimming, Hao Ming Chen, Bin Liu

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

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.

Original languageEnglish
Pages (from-to)29186-29193
Number of pages8
JournalACS Applied Materials and Interfaces
Volume8
Issue number42
DOIs
StatePublished - 26 Oct 2016
Externally publishedYes

Keywords

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

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