Two-Dimensional WO3 Nanosheets Chemically Converted from Layered WS2 for High-Performance Electrochromic Devices

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

7 Scopus Citations
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Author(s)

  • Ashraful Azam
  • Jungmo Kim
  • Junyong Park
  • Travis G. Novak
  • Anand P. Tiwari
  • Sung Ho Song
  • Bumsoo Kim

Detail(s)

Original languageEnglish
Pages (from-to)5645-5651
Journal / PublicationNano Letters
Volume18
Issue number9
Early online date16 Aug 2018
Publication statusPublished - 12 Sep 2018
Externally publishedYes

Abstract

Two-dimensional (2D) transitional metal oxides (TMOs) are an attractive class of materials due to the combined advantages of high active surface area, enhanced electrochemical properties, and stability. Among the 2D TMOs, 2D tungsten oxide (WO3) nanosheets possess great potential in electrochemical applications, particularly in electrochromic (EC) devices. However, feasible production of 2D WO3 nanosheets is challenging due to the innate 3D crystallographic structure of WO3. Here we report a novel solution-phase synthesis of 2D WO3 nanosheets through simple oxidation from 2D tungsten disulfide (WS2) nanosheets exfoliated from bulk WS2 powder. The complete conversion from WS2 into WO3 was confirmed through crystallographic and elemental analyses, followed by validation of the 2D WO3 nanosheets applied in the EC device. The EC device showed color modulation of 62.57% at 700 nm wavelength, which is 3.43 times higher than the value of the conventional device using bulk WO3 powder, while also showing enhancement of ∼46.62% and ∼62.71% in switching response-time (coloration and bleaching). The mechanism of enhancement was rationalized through comparative analysis based on the thickness of the WO3 components. In the future, 2D WO3 nanosheets could also be used for other promising applications such as sensors, catalysis, thermoelectric, and energy conversion.

Research Area(s)

  • electrochromic device, intercalation, Layered material, oxidation, tungsten oxide

Citation Format(s)

Two-Dimensional WO3 Nanosheets Chemically Converted from Layered WS2 for High-Performance Electrochromic Devices. / Azam, Ashraful; Kim, Jungmo; Park, Junyong; Novak, Travis G.; Tiwari, Anand P.; Song, Sung Ho; Kim, Bumsoo; Jeon, Seokwoo.

In: Nano Letters, Vol. 18, No. 9, 12.09.2018, p. 5645-5651.

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