A new type of dual-functional poly(5-cyanoindole) (P5ICN)/TiO₂ nanocomposites with porous network structure is prepared by combining the hydrothermal synthesis and electrodeposition. Due to the synergy effect of P5ICN and TiO₂, the prepared P5ICN/TiO₂ nanocomposites have excellent electrochromic and supercapacitive properties. The color of P5ICN/TiO₂ nanocomposites can change between light yellow and dark-green under different voltage. The electron withdrawing -C≡N group decreases the band gap of polyindole, which enable a good band gap matching between P5ICN and TiO₂, thus improving the electron transport capacity of the material. Benefiting from the highly ordered nanorod structure of TiO₂, P5ICN/TiO₂ nanocomposites shows enhanced pseudocapacitive behavior. When the current density is 0.3 mA cm⁻², this material exhibits the highest specific capacitance (36.18 mF cm⁻²). An asymmetric electrochromic supercapacitor device (ESD) is also fabricated by using P5ICN/TiO₂ nanocomposites and poly(3,4-ethylenedioxythiophene) (PEDOT) as anode materials and cathode materials, respectively. This ESD also has a high specific capacitance of 14.7 mF cm⁻² and shows obvious color change from yellow–green to blue-black during the charging and discharging process. Therefore, the level of stored energy for the device can be intelligently monitored by its color change. It is believed that this new ESD will have potential application in the field of smart electronics.

将水热合成与电沉积相结合，制备了一种新型的具有多孔网络结构的双功能聚（5-氰基吲哚）（P5ICN）/ TiO ₂纳米复合材料。由于P5ICN和TiO ₂的协同作用，制得的P5ICN / TiO ₂纳米复合材料具有优异的电致变色和超电容性能。在不同的电压下，P5ICN / TiO ₂纳米复合材料的颜色可以在浅黄色和深绿色之间变化。吸电子的-C≡N基团减小了聚吲哚的带隙，这使得P5ICN和TiO ₂之间具有良好的带隙匹配，从而提高了材料的电子传输能力。受益于TiO ₂的高度有序的纳米棒结构，P5ICN / TiO ₂纳米复合材料显示出增强的伪电容行为。当电流密度为0.3 mA cm ^-2时，该材料表现出最高的比电容（36.18 mF cm ^-2）。还分别通过使用P5ICN / TiO ₂纳米复合材料和聚（3,4-乙撑二氧噻吩）（PEDOT）作为阳极材料和阴极材料来制造不对称电致变色超级电容器器件（ESD）。此ESD还具有14.7 mF cm ^-2的高比电容并且在充电和放电过程中显示出从黄绿色到蓝黑色明显的颜色变化。因此，可以通过其颜色变化来智能地监视设备的存储能量水平。人们相信，这种新的ESD将在智能电子领域具有潜在的应用。