Complementary hybrid electrodes for high contrast electrochromic devices with fast response
Complementary hybrid electrodes for high contrast electrochromic devices with fast response
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DOI：
10.1038/s41467-019-12617-4
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发表时间：
2019-10-25
影响因子：
16.6
通讯作者：
Oesterschulze, Egbert
中科院分区：
文献类型：
--
作者：
Kortz, Carsten;Hein, Alexander;Oesterschulze, Egbert
快速切换的“单色到黑色”电致变色器件目前正在研究中，作为现代应用中的潜在候选者，如电子纸或具有额外功能的相机系统中的超紧凑虹膜或可切换中性滤光片。然而，最近的电致变色装置显示出缺乏对比度或响应时间慢。为了克服这些缺陷，我们重点关注我们设备中着色混合电极的仔细材料组成。我们已经建立了一个纳米多孔Sb掺杂的SnO 2电极作为支持电极的化学吸附电致变色四苯基联苯胺分子，由于其良好的导电性，在氧化还原电位范围内的分子。这种混合电极与改性的纳米多孔TiO 2/紫精电极相结合，以实现高性能的互补电致变色器件。0.5 s的快速切换时间常数和同时在605 nm处的光密度变化Δ OD = 2.04证实了我们成功的概念。达到的440 cm（2）C-1的着色效率超过了迄今为止提出的所有高对比度设备。
Fast switching 'transparent-to-black' electrochromic devices are currently under investigation as potential candidates in modern applications like e-papers or with additional functionality as ultracompact iris or switchable neutral filter in camera systems. However, recent electrochromic devices show either a lack of contrast or slow response times. To overcome these deficiencies we focus on a careful material composition of the colouring hybrid electrodes in our device. We have established a nanoporous Sb-doped SnO2 electrode as supporting electrode for chemisorbed electrochromic tetraphenylbenzidine molecules due to its good conductivity in the redox potential range of the molecule. This hybrid electrode was combined with a modified nanoporous TiO2/viologen electrode to realize a high performance, complementary electrochromic device. Fast switching time constants of 0.5 s and concurrently high change in optical density Delta OD = 2.04 at 605 nm confirm our successful concept. The achieved colouration efficiency of 440 cm(2) C-1 exceeds every high contrast device presented so far.