Journal of Solid State Electrochemistry

, Volume 23, Issue 1, pp 33–52 | Cite as

Influence of heat treatment temperature of carbon fiber felt substrate on polyaniline electrosynthesis and its properties

  • Anne Karoline dos Santos Poli
  • Rodrigo Barbosa Hilário
  • Adriana Medeiros Gama
  • Mauricio Ribeiro Baldan
  • Emerson Sarmento GonçalvesEmail author
Original Paper


Polyaniline was electrosynthesized using three voltammetric cycles on carbon fiber felts annealed at 1400, 1600, 2000, and 2300 K. Felts and composites was characterized by scanning electron microscopy, X-ray diffraction, Raman and Fourier transform infrared spectroscopy, and electrochemical impedance spectroscopy. Annealing temperatures increasing provides more crystalline felts. The increase of capacitance is due to presence of functional groups that attract a lot of charge to double layer. Capacitance found for felts treated in 1400 K is larger compared to felts treated in 2300 K. The functional groups presence on annealed felts at lower temperature implies polyaniline growth in several orientations and regions, evidenced by the high heteroatoms ratios which decrease with increasing annealing temperature. Therefore, for higher temperatures, the polyaniline growth occurs at several additional orientations. The polyaniline oxidation degree was close to emeraldine allowing mobile charge presence. Electrochemical impedance spectroscopy confirmed that as temperature decreases, resistance of inner and outer double layer decreases. To 1600 K annealing, polyaniline showed an increase in inner double layer capacitance which can be confirmed by lower ratio between bipolarons and polarons. The tendency to increase energy and power density is most prominent for polyaniline at 2300 K felt.


Carbon fiber felt Heat treatment Polyaniline Electrosynthesis Structure EIS 



The authors would like to thank for technician support or AMR/IAE, AQI/IAE, and LAS/INPE.

Funding information

The authors are grateful for the financial support of FAPESP (project 2016/11462-3). This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) - Finance Code 001.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Instituto Tecnológico da AeronáuticaSão José dos CamposBrazil
  2. 2.Laboratório de Caracterização Físico-Química, Divisão de MateriaisInstituto da Aeronáutica e EspaçoSão José dos CamposBrazil
  3. 3.Laboratório Associado de SensoresInstituto Nacional de Pesquisas EspaciaisSão José dos CamposBrazil

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