三苯胺类自供能电致变色材料合成及器件开发

1. a 中国科学技术大学 化学与材料科学学院高分子科学与工程系 合肥 230026;
b 中国科学技术大学 合肥微尺度物质科学国家实验室 合肥 230026
• 投稿日期:2013-01-17 发布日期:2013-03-05
• 通讯作者: 徐春叶,chunye@ustc.edu.cn; Tel.: 0551-63603459 E-mail:chunye@ustc.edu.cn
• 基金资助:

项目受中国科学院百人计划、中组部“千人计划”和国家自然科学基金(Nos. 21274138, 21074125)资助.

Synthesis of a Novel Triphenylamine Derivative and Exploration of Self-powered Electrochromic Device

Chen Meia, Yang Shuweib, Zheng Jianmingb, Xu Chunyea,b

1. a Department of Polymer Science and Engineering, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China;
b Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China
• Received:2013-01-17 Published:2013-03-05
• Supported by:

Project supported by the Hundred Talents Program of Chinese Academy of Sciences, the Thousand Talents Program of Chinese Central Goverment and the National Natural Science Foundation of China (Nos. 21274138, 21074125).

Self-powered electrochromic device is a kind of instrument that can change transmittance with the electricity converting from solar energy. To realise the dual functions of solar energy harvesting and transmittance changing in one material, a novel derivative of triphenylamine (4-((4-(dimethylamino)phenyl)(phenyl)amino)benzyl)phosphoric acid (Ph2ABPA-Me2) is designed and synthesized in this paper. 1H NMR, FT-IR and MS were used to characterize the structure of the compound. Working electrode was made by dissolving the compound in chloroform and then immersing titanium dioxide-coated fluorine-doped tin oxide glass in the solution for 24 h. Its spectroelectrochemical properties were investigated with a UV-vis-IR spectrophotometer and a potentiostat, which allowed us to acquire transmittance spectra under potential control in a solution of 0.1 mol/L lithium perchlorate in propylene carbonate. The experiment was carried out with three electrodes system in which A wire acted as reference electrode and Pt wire as counter electrode. The working electrode shows light yellow with relatively high transmittance at -1.5 V and dark green with low transmittance at +2.5 V. The maximum transmittance contrast between the two states is 64.2% at 629 nm. Meanwhile, to investigate the photovoltaic properties of Ph2ABPA-Me2, Ph2ABPA-Me2-based electrochromic devices were made by sandwiching the working electrode and Pt-based counter electrode together with electrolyte of Iodolyte AN-50. The photovoltaic properties were measured with a solar simulator under 1 sun AM1.5G illumination. Energy conversion efficiency of 0.32% was obtained, with short-circuit current density of 1.32 mA/cm2, open-circuit voltage of 0.44 V and fill factor of 0.54. All the results mentioned above suggest that the compound has dual functions of electrochromism and photovoltaics. Compared with traditional photoelectrochromic devices with both a photovoltaic electrode and an electrochromic electrode, the dual functional Ph2ABPA-Me2-based electrochromic device shows properties of simple construction, cheap to make and friendly to environment, and thus may have potential applications in buildings, vehicles and numerous types of displays.