Self-Assembled Polyaniline/Ti3C2Tx Nanocomposites for High-Performance Electrochromic Films

Abstract

Electrochromic materials and devices are attracting intense attention because of their low energy consumption and open-circuit memory effect. Considering the difficult processing characteristics of electrochromic conductive polymers, we developed a facile and scalable strategy to prepare solution processable polyaniline (PANI)-based nanocomposites by introducing two-dimensional titanium carbon nanosheets (MXene) through a self-assembly approach. The PANI/MXene nanocomposite can be fabricated into porous films via spray-coating process, which show an obvious synergetic effect of both materials, leading to superior electrochromic properties. The optical contrast of the optimized PANI/MXene film reached as high as 55% at =700 nm, and its response times were 1.3 s for coloration and 2.0 s for bleaching, respectively. In addition, the composite film also showed excellent cycle stability (after 500 cycles, the ΔT retention was above 87%). The improved electrochromic properties are owed to the high conductivity of MXene and the formation of the porous composite film structure, which promote the electronic/ionic transfer and migration efficiency. This research suggests that the self-assembly method and the conductive polymer/MXene nanocomposites have a potential application in the fields of electronic functional films and devices.

One-Step Method for Fabricating Janus Aramid Nanofiber/MXene Nanocomposite Films with Improved Joule Heating and Thermal Camouflage Properties

“…In the FTIR spectrum of the pristine ANF film, distinctive absorption peaks are observed at the wavenumbers of 1642, 1537, 1496, 1301, 724, and 642 cm –1 , corresponding to the stretching vibrations of CO, the coupling modes of N–H deformation and C–N stretching, the stretching vibrations of CC in the benzene ring, the stretching vibrations of Ph–N, the out-of-plane bending vibrations of N–CO, and the out-of-plane bending vibrations of CO, respectively. ,, In the FTIR spectra of MXene, the O–H stretching vibration is observed at 3455 cm –1 , and the C–O stretching vibration is observed at 1645 cm –1 . The 1390 and 569 cm –1 peaks are assigned to the stretching vibrations of C–O and −OH. ,, Upon comparison with the FTIR spectra of ANF and MXene, no new peaks are observed for the ANF/MXene composite film, suggesting the absence of chemical change during fabrication. Nonetheless, some subtle shifts are evident in the positions of the CO peak (attributed to the group of ANF) and the −OH peak (attributed to the end group of MXene).…”

Development and Characterization of Novel Hybrid Materials Formed from ZnO-SiO2-Modified and Polyaniline for Organic Dyes Adsorption and Electrochemical Supercapacitor Applications

“…Additionally, the N1s spectrum of PANI contains three kinds electronic states of the quinoid imine (= N-) at 398.97 eV, benzenoid amine (-NH 2 ) at 400.36 eV and the cationic radical (-NH + ) at 401.55 eV (Fig. 3-d) [26,27]. Moreover, the N1s corelevel spectrum of PANI@ZnO-SiO 2 (Fig.…”

Recent advances in polyaniline-based micro-supercapacitors

“…PANI materials in different oxidation states usually exhibit different colors, which is the origin of their electrochromic functionality. [172][173][174] For instance, luecoemeraldine PANI becomes white in the solid state and nearly transparent in solution. This is reflected by the prefix ''lueco'' in its name, which means white or colorless.…”