基于快速响应f-La_(2)O_(3)/PANI电致变色薄膜的制备与性能表征

Preparation and characterization of electrochromic thin films based on fast response f-La_(2)O_(3)/PANI

基于电致变色薄膜在军事伪装、建筑节能、汽车等工业领域具有重要研发前景,研究通过硅烷偶联剂KH-550对氧化镧(La_(2)O_(3))表面进行修饰(f-La_(2)O_(3)),并与导电聚合物聚苯胺(PANI)复合制备f-La_(2)O_(3)/PANI电致变色材料。利用XRD、FTIR、SEM-EDS、UV-vis、电化学工作站对f-La_(2)O_(3)/PANI电极与纯PANI电极进行对比分析,重点研究f-La_(2)O_(3)掺入量对PANI结构形貌、电化学性能及电致变色性能的影响。研究结果表明:f-La_(2)O_(3)的掺入使PANI纤维有向细小化方向变化的趋势,其复合材料较纯PANI具有更高的结晶度和分子链取向;f-La_(2)O_(3)会打破PANI的网络交联结构导致复合材料的电化学性能有所降低,但可以加快PANI质子化和脱质子化的转变进程,并有效抑制薄膜电致变色过程中PANI的氧化降解;当镧胺比1∶3.5时,fLa_(2)O_(3)/PANI复合材料的电致变色性能达到最佳,波长570 nm处的着色效率(CE)为22.81 cm^(2)·C^(-1),褪色、着色响应时间(τ_(b),τ_(c))分别为1.29 s、1.33 s,经320次着褪色循环后薄膜电化学活性保持在初始的50%左右。

Based on the fact that electrochromic films have important research and development prospects in military camouflage,building energy saving,automobiles and other industrial fields,the surface of La_(2)O_(3)was modified by silane coupling agent KH-550 and compounded with conductive polymer polyaniline(PANI)to prepare f-La_(2)O_(3)/PANI electrochromic material.Comparative analysis of composite electrode and pure PANI electrode by XRD,FTIR,SEM-EDS,UV-vis,and electrochemical workstation.The effect of f-La_(2)O_(3)addition on the structure,morphology,electrochemical properties and electrochromic properties of PANI was investigated.The results show that the incorporation of f-La_(2)O_(3)makes the PANI fibers tend to be smaller,and the composite material has higher crystallinity and molecular chain orientation than pure PANI;f-La_(2)O_(3)will break the network cross-linking structure of PANI,resulting in a decrease in the electrochemical performance of the composite,but it can accelerate the transition process of PANI protonation and deprotonation,and effectively inhibit the oxidative degradation of PANI during the electrochromic process of the film;When f-La_(2)O_(3)/aniline molar ratio is 1∶3.5,the electrochromic performance of f-La_(2)O_(3)/PANI composite reaches the best,the coloration efficiency(CE)at 570 nm is 22.81 cm^(2)·C^(-1),and the fading and coloring response time(τ_(b),τ_(c))are 1.29 s and 1.33 s,respectively.After 320 cycles of fading,the electrochemical activity of the thin films remains about 50%of the initial value.