Cheap and eco-friendly synthesis of poh aniline and performance of aqueous Zn-polyaniline battery

Abstract

Polymerized from the abundant and cheap aniline monomer, polyaniline has high stability in air, water and other media, good redox reversibility, and advantages of easy synthesis, which has been widely studied] in recent years. In this paper, a new synthesis method of polyaniline by adding trace ammonium persulfate into the conventional system of H2O2-Fe2+ was used, which achieves a yield of polyaniline higher than 90% in less than 5 hours. More importantly, the waste solution generated in the processes of filtering and washing of polyaniline products can be recovered and recycled for subsequent synthesis, which avoids the problem of waste liquid treatment existed in conventional synthesis route. The infrared absorption peaks of the as prepared polyaniline are consistent with that synthesized in conventional H2O2-Fe2+ system. The specific capacity of the zinc-polyaniline aqueous battery assembled by the polyaniline is as high as 80 mAh • g-1 when charged and discharged at 0.1C. The coulomb efficiency is higher than 93% when the battery is charged and discharged over 800 times at 0.3C. It show's that the batteiy has good redox reversibility and good charge discharge cycle performance. This work provides a low cost synthesis route of polyaniline, which inspires the further development of zinc polyaniline batteiy for commercial application.