Lightweight, highly bendable and foldable electrochromic films based on all-solution-processed bilayer nanowire networks
Lightweight, highly bendable and foldable electrochromic films based on all-solution-processed bilayer nanowire networks
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DOI：
10.1039/c6tc01516f
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发表时间：
2016-01-01
影响因子：
6.4
通讯作者：
Li, Yaogang
中科院分区：
文献类型：
--
作者：
Li, Kerui;Zhang, Qinghong;Li, Yaogang
电极材料的机械和电化学稳定性问题一直是制约高柔性电致变色材料发展的长期障碍。本文通过在超薄聚对苯二甲酸乙二醇酯（PET）衬底上构建机械和电化学稳定的双层纳米线网络（bnn），实现了一种轻质、高度可弯曲和可折叠的电致变色（EC）薄膜。这些由银纳米线（AgNWs）和W18O49纳米线(W（18)O(49)NWs）组成的BNNs采用简单、连续的喷涂方法制备。采用海藻酸/聚（多巴胺）复合物（Aa-PDA）和聚（3,4-乙烯二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）层分别作为粘结剂和电荷平衡层，增强纳米线的界面和结构稳定性，防止纳米线的电化学腐蚀。这些优化的高柔性EC薄膜具有良好的光学对比度，高显色效率（高达118.1 cm(2) C-1），即使在500次弯曲或100次折叠循环后，也具有高度增强的电化学稳定性和出色的结构稳定性。此外，EC薄膜每平方厘米的重量小于2.3毫克。喷涂方法易于控制，并允许方便的图案，这是重要的现实生活中的应用。
Mechanical and electrochemical stability issues of electrode materials have been long-standing obstacles restricting the development of highly flexible electrochromics. Herein, a lightweight, highly bendable and foldable electrochromic (EC) film is realized through the construction of mechanically and electrochemically stable bilayer nanowire networks (BNNs) on ultra-thin polyethylene terephthalate (PET) substrates. These BNNs composed of silver nanowires (AgNWs) and W18O49 nanowires (W(18)O(49)NWs) are prepared using a facile and continuous spray-coating method. An alginic acid/poly(dopamine) complex (Aa-PDA) and a poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) layer are used as a binder and a charge balancing layer, respectively, to enhance the interfacial and structural stability of nanowires and prevent the electrochemical corrosion of AgNWs. These optimized and highly flexible EC films exhibit good optical contrast, high coloration efficiency (up to 118.1 cm(2) C-1), highly enhanced electrochemical stability and excellent structural stability even after 500 bending or 100 folding cycles. Moreover, EC films per square centimeter weigh less than 2.3 mg. The spray-coating method is easily controlled and allowed for convenient patterning, which is important for real-life applications.