Issue 14, 2011

Hydrothermally synthesized WO3nanowire arrays with highly improved electrochromic performance

Abstract

A hexagonal WO3 nanowire array film is obtained using a template-free hydrothermal method by adding ammonium sulfate as a capping agent. The WO3 nanowires grown vertically on a FTO-coated glass substrate are woven together at the surface of the film, forming well-aligned arrays at the bottom part and a porous surface morphology. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) reveal that each nanowire is a hexagonal single crystal and their long axes are oriented toward the [0001] direction. Due to the highly porous surface, good contact with the conductive substrate and large tunnels of the hexagonal-structured WO3, a fast switching speed of 7.6 and 4.2 s for coloration and bleaching, respectively, and a high coloration efficiency of 102.8 cm2Cāˆ’1 are achieved for the WO3 nanowire array film.

Graphical abstract: Hydrothermally synthesized WO3 nanowire arrays with highly improved electrochromic performance

Supplementary files

Article information

Article type
Paper
Submitted
14 Dec 2010
Accepted
11 Feb 2011
First published
24 Feb 2011

J. Mater. Chem., 2011,21, 5492-5498

Hydrothermally synthesized WO3 nanowire arrays with highly improved electrochromic performance

J. Zhang, J. Tu, X. Xia, X. Wang and C. Gu, J. Mater. Chem., 2011, 21, 5492 DOI: 10.1039/C0JM04361C

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