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Scalable free-standing polypyrrole films for wrist-band type flexible thermoelectric power generator

Author

Listed:
  • Bharti, Meetu
  • Jha, P.
  • Singh, Ajay
  • Chauhan, A.K.
  • Misra, Shantanu
  • Yamazoe, Masato
  • Debnath, A.K.
  • Marumoto, Kazuhiro
  • Muthe, K.P.
  • Aswal, D.K.

Abstract

Highly flexible free-standing polypyrrole films were prepared by the interfacial chemical polymerization of pyrrole (in cyclohexane) using aqueous FeCl3 as an oxidant and p-toluene sulphonic acid (PTSA) as a dopant. Morphological characterization revealed the granular morphology of the synthesized films and also suggested a reduction in their thickness with the increase in PTSA concentration. The increase of the doping content in these polypyrrole films, also resulted in the enhancement of electrical conductivity from 4.8 S/cm to 162.7 S/cm without much affecting the Seebeck coefficient ∼4–8 μV/K. The combined results of X-ray photoelectron spectroscopy and Electron spin resonance spectroscopy (ESR) confirms the enhancement of doping content (N+/N content) i.e. formation of charge carriers such as polarons/bipolarons with the increase in PTSA concentration. The synergetic combination of high electrical conductivity along with moderate Seebeck coefficient in the doped free-standing PPy films resulted in the highest average power factor of ∼0.45 μW/mK2. A wrist-band type thermoelectric power generator was also designed by integrating seven number of free-standing PPy films to manifest their potential for practical thermoelectric applications. The fabricated device exhibited maximum open-circuit voltage and current respectively as 336 μV and ∼46 nA, for a temperature difference of 80 °C. The work reveals new avenues towards the development of wearable energy harvesting devices that can be possibly designed using free-standing PPy films.

Suggested Citation

  • Bharti, Meetu & Jha, P. & Singh, Ajay & Chauhan, A.K. & Misra, Shantanu & Yamazoe, Masato & Debnath, A.K. & Marumoto, Kazuhiro & Muthe, K.P. & Aswal, D.K., 2019. "Scalable free-standing polypyrrole films for wrist-band type flexible thermoelectric power generator," Energy, Elsevier, vol. 176(C), pages 853-860.
    • Handle: RePEc:eee:energy:v:176:y:2019:i:c:p:853-860
    DOI: 10.1016/j.energy.2019.04.013
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    References listed on IDEAS

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    1. Ni, Dan & Song, Haijun & Chen, Yuanxun & Cai, Kefeng, 2019. "Free-standing highly conducting PEDOT films for flexible thermoelectric generator," Energy, Elsevier, vol. 170(C), pages 53-61.
    2. We, Ju Hyung & Kim, Sun Jin & Cho, Byung Jin, 2014. "Hybrid composite of screen-printed inorganic thermoelectric film and organic conducting polymer for flexible thermoelectric power generator," Energy, Elsevier, vol. 73(C), pages 506-512.
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