Electrocatalytic properties of polyaniline–TiO2 nanocomposites

Abstract

An efficient methodology of polyaniline-TiO 2 nancomposite (PAniTNC) was developed through various proportions of ceramic added by chemical polymerization at room temperature. The chemical polymerization reactions were carried out using potassium perdisulphate as an oxidizing agent. The particle size of PAniTNC was found in the range of 8-15 nm as analysed by transmission electron microscopy. The Ti-O characteristic stretching bands at 630 and 558 cm-1 , indicating the presence of TiO 2 in polyaniline matrix was confirmed by fourier transform infrared spectroscopy. The characterization of the nanocomposite crystalline shape was carried out using X-ray diffraction method. Thermogravimetric and differential scanning calorimetry analyses indicate high thermal stability. SEM analysis showed mixed granular nature of the polymer-ceramic nanocomposites. EDX analysis shows the presence of Ti, C and N in composites. Cyclic voltammetric studies exhibit good adherent behaviour on the electrode surface at pH 1.0. It reveals the presence of oxidation peak at 0.417 V and reduction peak at 0.285 V. It has been observed that PAniTNC-modified GCE has good oxygen reduction ability, and also enhances methanol reduction.

Hybrid Material of PANI with TiO2‐SnO2: Pseudocapacitor Electrode for Higher Performance Supercapacitors

“…), 2917 cm −1 is due to (aromatic C−H stretching vibrations), 1565 (C=C str., quinonoid ring), 1477 cm −1 (C=C str., benzenoid ring), 1303 cm −1 (C−N str., quinonoid ring), 1240 cm −1 (C−N str., benzenoid ring), 1110 cm −1 (N=Q=N vibration, where Q represents the quinonoid ring), 802 cm −1 (1,4‐disubstituted benzene) and 507 (C−H out‐of‐plane bending vibration). The FT‐IR spectra ofPANI‐SA•SnO 2 (Figure b) PANI‐SA•TiO 2 (Figure c), PANI‐SA•TiO 2 ‐SnO 2 (Figure d) are very similar to that of the FT‐IR spectrum of PANI‐SA, except a slight shift in the absorption peaks, due to changes in the electron density in the quinonoid ring of the polyaniline salt …”

Fabrication of (C4H9)4NPZnW11‐TiO2/PANI as an Efficient Nanocatalyst for Dye Degradation

“…When (C 4 H 9 ) 4 NPZnW 11 ‐TiO 2 catalysts are added on the surface of TiO 2 , the restrictive effect of titanium dioxide nanoparticles compromises the degree of crystallinity of PANI . By comparing the XRD patterns of (C 4 H 9 ) 4 NPZnW 11 ‐TiO 2 /PANI composite with that of the balk form of (C 4 H 9 ) 4 NPZnW 11 , TiO 2 and PANI, it could be seen that the sharp peaks at 24.70°, 38.22°, 47.60°, and 54.11° are due to (110), (101), (111), and (211) crystal planes of anatase titanium dioxide and POMs revealed at 7–45°, showing the presence of TiO 2 and TBAPW 11 Zn in PANI . In addition, the XRD patterns of the hybrids (C 4 H 9 ) 4 NPZnW 11 ‐TiO 2 /PANI are matched with the primary (C 4 H 9 ) 4 NPZnW 11 , revealing that the Keggin structure remains intact in the hybrids (Figure 5c).…”

Preparation and Investigations of Structural, Optical and Conductivity Properties of Polyaniline/Titanium Dioxide Nanocomposites

“…Shows that the selected area electron diffraction pattern (SAED) of PANI/TiO 2 nanocomposites. The amorphous structures of the nanocomposites leads to it have a corresponding less pronounced diffuse rings in the SAED pattern [20]. However, when the 5 wt % TiO 2 NPs concentration, there is not regular arrangement of NPs can be observed.…”