用于具有超大光学调制的电致变色智能窗的层叠 NiO 纳米线/纳米片同质结构,Nanoscale

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用于具有超大光学调制的电致变色智能窗的层叠 NiO 纳米线/纳米片同质结构
Nanoscale ( IF 5.8 ) Pub Date : 2023-04-14 , DOI: 10.1039/d3nr01211e
Yi Gao ₁ , Pengyang Lei ₁ , Siyu Zhang ₁ , Huanhuan Liu ₁ , Chengyu Hu ₁ , Zhu Kou ₁ , Jinhui Wang ₁ , Guofa Cai ₁

Affiliation

纳米级活性材料的结构工程对于提高电致变色器件的性能至关重要。然而，不充分的结构设计不可避免地导致电子/离子传输受限和电致变色性能不足。在此，提出了一种新型的层叠纳米线/纳米片同质结构，用于增强过渡金属氧化物薄膜的电致变色性能。受益于纳米线和纳米片结构的一锅式集成，具有独特同质结构的 NiO 薄膜在 550 nm 处提供高达 93.4% 的超大光学调制和 72.1 cm 2 C −1 的^高着色^效率与 NiO 基材料相比。此外，该薄膜在 1000 次着色和漂白过程中保持其 91% 的光学调制。_{此外，通过将NiO薄膜与TiO 2}离子存储层集成在具有电致变色和储能双重功能的组装智能窗中，验证了该器件的高性能。作为概念证明，太阳能电池与电致变色器件的集成展示了自供电智能窗户对于节能的重要意义。为此，这种电致变色薄膜的结构设计策略将为研究高性能电致变色系统提供独特的途径。

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A layer-stacked NiO nanowire/nanosheet homostructure for electrochromic smart windows with ultra-large optical modulation

The structural engineering of active materials at the nanoscale level is crucial to improving the performance of electrochromic devices. However, an insufficient structural design inevitably results in limited electron/ion transportation and inadequate electrochromic performance. Herein, a new type of layer-stacked nanowire/nanosheet homostructure is proposed for enhancing the electrochromic properties of transition metal oxide films. Benefiting from the one-pot feature integration of nanowire and nanosheet structures, the NiO film with a unique homostructure delivers ultra-large optical modulation up to 93.4% at 550 nm and a high coloration efficiency of 72.1 cm² C⁻¹ in comparison with NiO-based materials. In addition, the film maintains 91% of its optical modulation over 1000 cycles of coloration and bleaching processes. Furthermore, the high performance of the device was verified by integrating the NiO film with the TiO₂ ion storage layer in assembled smart windows with a dual function of electrochromic and energy storage. As a proof of concept, the integration of solar cells with electrochromic devices demonstrates the great significance of self-powered smart windows for energy-saving. To this end, such a strategy of structural design for electrochromic films would offer a distinctive pathway toward studying high-performance electrochromic systems.

更新日期：2023-04-14

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