Li Xuefei, Wang Zhiyang, Chen Ke, Zemlyanov Dmitry Y, You Liyan, Mei Jianguo
Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States.
Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States.
ACS Appl Mater Interfaces. 2021 Feb 3;13(4):5312-5318. doi: 10.1021/acsami.0c19685. Epub 2021 Jan 20.
Conjugated electrochromic polymers hold great promises for next-generation color-changing windows and displays. One of the major roadblocks in their solid-state electrochromic devices is the relatively poor cycling stability. Finding ion-storage materials as a charge-balancing component is critical in improving their electrochemical cycling stability. A key criterion for the selection of ion-storage materials is to match their electroactive voltage windows with the paired electrochromic polymers. Thus, we developed a nanostructured, amorphous vanadium oxide (VO) ion-storage material that exhibits high transmissivity, minimal color interference, and excellent charge-balancing capability in a closely matched electroactive window with the paired electrochromic polymers. High-performance magenta-to-transmissive hybrid electrochromic devices constructed from pairing the polymer with the VO can be reversibly switched for 50 000 cycles with an optical loss less than 5%.
共轭电致变色聚合物在下一代变色窗和显示器方面有着巨大的前景。其固态电致变色器件的主要障碍之一是循环稳定性相对较差。寻找离子存储材料作为电荷平衡组件对于提高其电化学循环稳定性至关重要。选择离子存储材料的一个关键标准是使其电活性电压窗口与配对的电致变色聚合物相匹配。因此，我们开发了一种纳米结构的非晶态氧化钒（VO）离子存储材料，该材料在与配对的电致变色聚合物紧密匹配的电活性窗口中表现出高透射率、最小的颜色干扰和出色的电荷平衡能力。由该聚合物与VO配对构建的高性能品红色到透射型混合电致变色器件可以可逆地切换50000次循环，光损失小于5%。
