Improved electrochromic performance of WO 3 films with size controlled nanorods
Improved electrochromic performance of WO 3 films with size controlled nanorods
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DOI：
10.1016/j.electacta.2017.10.193
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发表时间：
2018
影响因子：
6.6
通讯作者：
G. Yuan;Hua Chenzheng;Shahid Khan;J. Shanshan;Zhizheng Wu;Y. Liu;Jianxun Wang;Chen-lu Song
中科院分区：
文献类型：
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作者：
G. Yuan;Hua Chenzheng;Shahid Khan;J. Shanshan;Zhizheng Wu;Y. Liu;Jianxun Wang;Chen-lu Song
采用湿化学法成功制备了尺寸可控的WO 3纳米棒电致变色薄膜。采用高分辨透射电子显微镜、扫描电子显微镜、X射线光电子能谱、X射线衍射和电化学方法研究了氧化钨纳米棒和氧化钨纳米薄膜的结构和电致变色性能。在表面活性剂的作用下，单分散氧化钨纳米棒的平均长度和直径从38 × 3.2 nm增加到89 × 4.5 nm。结果表明，WO 3纳米棒薄膜的电致变色响应时间与纳米棒的尺寸密切相关。通过简单地改变纳米棒的尺寸，纳米棒薄膜的响应时间可以调节近5倍。电化学阻抗谱的研究表明，这种趋势可以归因于WO 3纳米棒的尺寸效应对H离子扩散动力学的影响。同时，所有的纳米棒膜都表现出良好的电化学稳定性，因为在1000次循环后没有显著的性能下降。在633 nm处的透射率的电致变色调制约为22%-49%。上述结果表明，通过控制WO 3纳米棒的尺寸，可以很容易地调节电致变色性能，特别是响应时间，指示不同场合所需的不同响应时间的潜在值。
Electrochromic WO3films with size controlled nanorods were successfully fabricated by a wet chemistry method. The structure and electrochromic properties of tungsten oxide nanorods and films were studied by High resolution transmission electron microscope, Scanning electron microscope, X-ray photoelectron spectroscopy, X-ray diffraction, and electrochemical methods. The average length and diameter of the monodispersed tungsten oxide nanorods increase from 38 × 3.2 nm to 89 × 4.5 nm with help from surfactants. The results show that the electrochromic response time of WO3nanorod films are strongly dependent on the size of the nanorods. By simply changing the size of the nanorods, the response time of the nanorod films can be regulated nearly by about five times. The electrochemical impedance spectroscopy study showed that such trend can be attributed to the size effect of WO3nanorods upon the dynamics of H ions diffusion. At the same time, all the nanorod films showed good electrochemical stability as there were no significant performance declines after 1000 cycles. The electrochromic modulations of transmittance at 633 nm were around 22%–49%. The above stated results demonstrate that, by controlling the size of WO3nanorods, the electrochromic properties can be easily adjusted, especially the response time, indicating potential values for different response time required at different occasions.