Synthesis of Isotruxene-incorporated Polyanilines for Application as Electrode Materials of Supercapacitors

• Main Authors: Shang-Yin Lin, 林尚胤
• Other Authors: Jye-Shane Yang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/99177360242326924374

碩士 === 國立臺灣大學 === 化學研究所 === 104 === Supercapacitors have emerged as a new kind of energy storage device with higher energy density than conventional capacitors and with superior power density and cyclic stability than batteries. Among the electrode materials for supercapacitors, polyaniline has been a promising candidate because of its simple synthesis, low cost, controllable electrical conductivity, good redox reversibility, and high environmental stability. However, long-term charge/discharge processes cause structural breakdown and, thus, fast capacitance decay of polyaniline. To improve the performance of polyanilines in supercapacitors, we have introduced the two-dimensional isotruxene scaffold to polyaniline to form a series of new polyanilines, including star-shaped SIP and SIA, as well as crosslinked CI. We also synthesized truxene-incorporated star-shaped STP for comparison. Our results indicate that the morphology of SIP and SIA is similar to that of polyaniline, which contains fibers and granules, but CI shows sphere morphology, attributable to its crosslinked structures. The isotruxene-incorporated polyanilines display higher specific capacitance than the parent polyaniline owing to strong electronic couplings among the branched arms. However, their cyclic stability is similar to parent polyaniline, presumably due to the unchanged intermolecular packing such that no channels are created for the movement of electrolyte ions during charge/discharge processes. Our results show that introduction of large π-conjugated systems to polyaniline could enhance the electrochemical performance. However, to improve the operation stability, the materials might need to possess nonplanar structures, so that channels for penetration of ions could be generated to reduce the structural deformation. This work may be helpful for future modification and application of novel polyanilines as the electrode materials of supercapacitors.