Crystalline/amorphous tungsten oxide core/shell hierarchical structures and their synergistic effect for optical modulation

D Zhou; D Xie; F Shi; D H Wang; X Ge; X H Xia; X L Wang; C D Gu; J P Tu

doi:10.1016/j.jcis.2015.08.042

Crystalline/amorphous tungsten oxide core/shell hierarchical structures and their synergistic effect for optical modulation

J Colloid Interface Sci. 2015 Dec 15:460:200-8. doi: 10.1016/j.jcis.2015.08.042. Epub 2015 Aug 21.

Authors

D Zhou¹, D Xie¹, F Shi¹, D H Wang¹, X Ge¹, X H Xia², X L Wang², C D Gu², J P Tu³

Affiliations

¹ State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
² State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310027, China.
³ State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310027, China. Electronic address: tujp@zju.edu.cn.

PMID: 26321573
DOI: 10.1016/j.jcis.2015.08.042

Abstract

High-performance electrochromic films with large color contrast and fast switching speed are of great importance for developing advanced smart windows. In this work, crystalline/amorphous WO3 core/shell (c-WO3@a-WO3) nanowire arrays rationally are synthesized by combining hydrothermal and electrodeposition methods. The 1D c-WO3@a-WO3 core/shell hierarchical structures show a synergistic effect for the enhancement of optical modulation, especially in the infrared (IR) region. By optimizing the electrodeposition time of 400s, the core/shell array exhibits a significant optical modulation (70.3% at 750nm, 42.0% at 2000nm and 51.4% at 10μm), fast switching speed (3.5s and 4.8s), high coloration efficiency (43.2cm(2)C(-1) at 750nm) and excellent cycling performance (68.5% after 3000 cycles). The crystalline/amorphous nanostructured film can provide an alternative way for developing high-performance electrochromic materials.

Keywords: Amorphous layer; Core/shell structure; Crystalline nanowire; Electrochromism; Tungsten trioxide.