Highly Optically Adjustable, Cyclically Stable Infrared Variable Emittance Devices Based on PANI Films and Li+ Electrolytes
LI Xiaobai1,2, ZHANG Leipeng2, XU Gaoping2, WANG Bo2, REN Zichen2, LI Yao2
1 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 2 Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
Abstract: The infrared variable emittance devices (IR-VEDs) based on electrochromic polyaniline (PANI) films have attracted increasing interest because of their promising applications in spacecraft intelligent thermal control. Electrolyte as an essential part of the PANI-based IR-VEDs directly affects their properties. However, few studies have focused on the effects of electrolytes on device performance, especially IR adjustment ability. Herein, in order to obtain high-performance IR-VED, the electrochemical behaviors and IR tunability of PANI films when cycling in three commonly used lithium salt electrolytes were investigated. It had been demonstrated that PANI films exhibited significantly different redox beha-viors, response times, and IR modulation ability in these electrolytes. Further, an electrolyte membrane with good ionic conductivity and mechanical integrity was prepared for IR-VED fabrication based on a preferable lithium salt. The resultant flexible IR-VED exhibited fast responses of about 10 s. In addition, high IR emittance changes of 0.39, 0.36, and 0.46 in the wavelength ranges of 2.5—25 μm, 3—5 μm, and 8—14 μm were achieved by the device. More importantly, the IR-VED showed superior IR adjustment stability after 2 000 electrochemical cycles, indicating pro-mising applications in dynamic IR regulation field.
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2021, Vol. 35 
