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Article Dans Une Revue Energy Année : 2019

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

Résumé

Highly flexible free-standing polypyrrole films were prepared by the interfacial chemical polymerization of pyrrole (in cyclohexane) using aqueous FeCl 3 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~4e8 mV/K. The combined results of X-ray photoelectron spectroscopy and Electron spin resonance spectroscopy (ESR) confirms the enhancement of doping content (N þ /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 mW/mK 2. 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 mV 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.
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Dates et versions

hal-02933569 , version 1 (08-09-2020)

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Meetu Bharti, P. Jha, Ajay Singh, A.K. K Chauhan, Shantanu Misra, et al.. Scalable free-standing polypyrrole films for wrist-band type flexible thermoelectric power generator. Energy, 2019, 176, pp.853-860. ⟨10.1016/j.energy.2019.04.013⟩. ⟨hal-02933569⟩
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