Chemical synthesis of polyaniline using sulphanilic acid as ..
Crystal structures of the prepared samples were characterized by X-ray diffraction (XRD) using an X-ray powder diffractometer (Rigaku D/max-2200PC). The weight ratio of the polymer in the samples was analyzed by thermogravimetric analysis (STA409PC), in air with a heating rate of 10 °C min-1. Infrared (IR) spectrum was recorded for KBr dilute sample using a STA449 F3/VERTEX 70/Agilent5977A spectrometer. The sizes and morphologies of the samples were characterized by using a field-emission scanning electron microscopy (FESEM, S-4800) and a transmission electron microscopy (TEM, TecnaiG2F20S-TWIN).
Photochemical Synthesis of Gold Nanorods - Journal of …
Core-shell Li4Ti5O12 @polyaniline composites (labeled as LP) were synthesized by in situ polymerization of aniline on LTO samples with different mole ratios of aniline:LTO (25:1, 50:1 and 100:1) and were named LP-1, LP-2 and LP-3, respectively. Typically, LTO samples and Cetyltrimethyl Ammonium Bromide were added to an aniline solution and were stirred at 0-5 °C for 30 min. Then, a 1 M HCl solution with hydrogen peroxide (mass ratio of hydrogen peroxide to aniline, 2:1) as an oxidant and tungstic acid (mass ratio of tungstic acid to aniline, 0.005:1) as a catalyst was added to the above suspension, and it was kept at 0-5 °C for 12 h. After the polymerization reaction, the termination agent potassium iodide (mass ratio of potassium iodide to aniline, 0.1:1) was added to the mixed solution and it was stirred at 60 °C for 2 h. Finally, the as-prepared samples were washed by deionized water and ethanol for several times, and then were dried for 12 h under vacuum. Pure PANI was also synthesized in the same process without the addition of LTO and Cetyltrimethyl Ammonium Bromide.
Herein, the core-shell Li4Ti5O12 @polyaniline composites (LP) were successfully synthesized by an in situ synthesis. The influences of mole ratios (aniline: LTO) on the microstructure and electrochemical performance of the products were explored, and the LP nanocomposite with a mole ratio of 50:1 aniline to LTO (labeled as LP-2) demonstrated an optimal structure with a PANI layer on the surface. The LP-2 electrode displayed high capacities and excellent rate performances, indicating its promising applications for high power LIBs in the future.