Potential Gradient-Driven Fast-Switching Electrochromic Device

作者：Yongxin Luo, Hongrun Jin, Yu-Cheng Lu, Zehao Zhu, Simin Dai, Liwei Huang, Liwei Huang, Xinyan Zhuang, Kaisi Liu, Liang Huang, Liang Huang · 发表于：ACS Energy Letters · 年份：2022 · DOI：10.1021/acsenergylett.2c00452 · 被引用次数：56 · 研究领域：Transition Metal Oxide Nanomaterials、Conducting polymers and applications、ZnO doping and properties

Electrochromic (EC) smart windows are considered one promising energy-conservation and emission-reduction device for green construction. However, conventional EC devices need external power to switch colors, which causes additional energy consumption. Herein, we propose a potential gradient strategy to attain a fast self-chargeable and -dischargeable EC system. In this strategy, the potential difference between Prussian blue (PB) and zinc (Zn) is established to reduce PB to Prussian white (PW) in 1.0 s, while etched carbon paper (ECP) could oxidize PW to its original state in 2.2 s. Moreover, this strategy is shown to be applicable for other high-performance EC systems, including Zn||WO 3 ||ECP, Zn||PEDOT||ECP, Al||PB||ECP, and Zn||PB||ZnHCF. The potential application of large-scale windows is discussed in terms of a prototype 25 cm 2 EC window. Thus, the unique potential gradient strategy provides new insights for developing a fast self-switching EC device, which exhibits great application prospects in both energy conservation and energy storage.