Phase transitions of polyaniline induced by electrochemical treatment

0488799 - ÚMCH 2019 RIV DE eng J - Článek v odborném periodiku
Tomšík, Elena - Konefal, Magdalena - Kohut, Olena - Ivanko, Iryna - Hromádková, Jiřina - Zhigunov, Alexander - Steinhart, Miloš
Phase transitions of polyaniline induced by electrochemical treatment.
Macromolecular Chemistry and Physics. Roč. 219, č. 7 (2018), s. 1-5, č. článku 1700627. ISSN 1022-1352. E-ISSN 1521-3935
Grant CEP: GA ČR(CZ) GA15-14791S
Grant ostatní: OPPK(XE) CZ.2.16/3.1.00/21545
Program: OPPK
Institucionální podpora: RVO:61389013
Klíčová slova: pseudocapacitors * polyaniline * high charge-discharge rate
Obor OECD: Physical chemistry
Impakt faktor: 2.622, rok: 2018

It is known that semiconducting polymers undergo structural changes only during overoxidation, which is simultaneously connected with the degradation of these polymers. However, if their electrochemical performance is studied within a potential window in which the polymer is stable, no morphological and/or structural changes are observed. It is demonstrated for the first time that polyaniline is able to undergo phase transitions (morphological/structural changes) between the potential cut‐off limits of 0 and 0.7 V, within which no degradation is observed. Scanning electron microscopy measurement provides evidence that the polymer surface changes from porous to smooth film, and differential scanning calorimetry and X‐ray diffraction data are used to investigate and confirm structural changes during the electrochemical treatment. Electrochemical performance is studied for polyaniline before and after phase transitions and is higher for polymer, in which morphological/structural changes occur. These results demonstrate that morphological/structural changes predetermine physical–chemical performance. In particular, the rearrangement of the polyaniline chains during electrochemical treatment has a crucial impact on the ability of the polymer to store energy.
Trvalý link: http://hdl.handle.net/11104/0283546