Growth behavior of WO<sub>3 </sub>crystal topological structure and its electrochromic properties

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Abstract

In this work, WO ₃crystal structure films are deposited on conductive glass substrates by seed layer assisted hydrothermal reaction method. Through controlling the concentration of hydrochloric acid, oxalic acid, and the hydrothermal postprocessing temperature, the micro-peony, micro urchin-like, and porous petal-like WO ₃crystal structures are obtained respectively. Scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and electrochemical characterization are used to study the formation mechanism of different structures and their effects on the electrochromic properties of WO ₃films. The Cl ^–in HCl has a strong promoting role towards the caxis in WO ₃crystal growth and oxalic acid has a promoting effect towards an aaxis. In terms of color efficiency, the CE value of micro-urchin is 42.37 cm ²/C, far greater than those of two other WO ₃structures, 15.21 cm ²/C and 12.71 cm ²/C. Owing to the cold-water quenching treatment, the CE value of WO ₃micro-peony with porous surface structure is 56.95 cm ²/C, quadruple CE value of the smooth surface structure, slightly better than that of the micro-urchin structure.

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Authors and contacts

Corresponding author:Yu Rui,liuxy@xmu.edu.cn; Liu Xiang-Yang,yurui@xmu.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 12074322), the Fundamental Research Funds for the Central Universities, and the Graduate Student Innovation Fund of Donghua University, China (Grant No. CUSF-DH-D-2019046).

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Vol. 71, Issue 2 - 2022-01-20

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