Hierarchical NiO microflake films with high coloration efficiency, cyclic stability and low power consumption for applications in a complementary electrochromic device
Hierarchical NiO microflake films with high coloration efficiency, cyclic stability and low power consumption for applications in a complementary electrochromic device
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DOI：
10.1039/c3nr00887h
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发表时间：
2013-01-01
期刊：
影响因子：
6.7
通讯作者：
Li, Yaogang
中科院分区：
文献类型：
--
作者：
Ma, Dongyun;Shi, Guoying;Li, Yaogang
我们已经证明，可以直接在FTO涂层的玻璃基板上使用一个简单的和无模板的水热技术，从纳米叶组装的分层NiO微片的薄膜。这种分层结构具有纳米尺寸的构建块和微米尺寸的组件的优点。因此，由于其高表面积和良好的电化学稳定性，该膜表现出高度增强的电致变色性能和循环稳定性。此外，一个互补的电致变色装置相结合的分层NiO微米片薄膜与自编织的WO 3纳米片薄膜的制备，以进一步提高电致变色性能。结果，互补电致变色器件显示出高的光学调制（在550 nm处为73.2%）、大的着色效率（通过施加-1.0 V的低着色电压，在550 nm处为146.9 cm（2）C-1）和快速的切换响应，着色时间为1.8 s，漂白时间为3.2 s。还观察到，在2000次连续着色/漂白循环后，电致变色性能没有显著降低，使其对于实际应用具有吸引力。
We have demonstrated that thin films of hierarchical NiO microflakes assembled from nanoleaves can be grown directly on FTO-coated glass substrates using a facile and template-free hydrothermal technique. This hierarchical structure holds the advantages of both nanometre-sized building blocks and microsized assemblies. Thus, the films exhibit highly enhanced electrochromic performances and cyclic stability due to their high surface area and good electrochemical stability. Moreover, a complementary electrochromic device combining the hierarchical NiO microflake film with a self-weaving WO3 nanoflake film is fabricated to further improve the electrochromic performance. As a result, the complementary electrochromic device shows a high optical modulation (73.2% at 550 nm), large coloration efficiency (146.9 cm(2) C-1 at 550 nm by applying a low coloration voltage of -1.0 V) and fast switching responses with a coloring time of 1.8 s and a bleaching time of 3.2 s. It is also observed that there is no significant degradation of the electrochromic properties after 2000 continuous coloration/bleaching cycles, making it attractive for practical applications.