Thermo-electrochemical cells empowered by selective inclusion of redox-active ions by polysaccharides

Research output: Contribution to journalArticle

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Abstract

Thermo-electrochemical cells (TECs) are a class of thermoelectric materials that offer high thermoelectric voltage (Seebeck coefficient) with potentially lower costs compared to the conventional thermoelectric materials. To maximize the potential of TECs, we show that the Seebeck coefficient of TECs with a redox pair of I - /I 3 - is enhanced by introducing polymer-ion interactions. Starch and polyvinylpyrrolidone (PVP) are employed as polymeric hosts for I 3 - ions. The effective concentration of free I 3 - ions in the cold cell decreases due to their selective inclusion in host polymers, resulting in an increase of the [I - ]/[I 3 - ] ratio. Meanwhile in the higher temperature cell, the inclusion of I 3 - ions by host polymers is less effective and the [I - ]/[I 3 - ] ratio is mostly determined by the intrinsic equilibrium without polymers. Consequently, the two electrode cells differing in temperature show a considerable difference in the concentration of I 3 - ions, which causes a significant increase of the Seebeck coefficient up to 1.5 mV K -1 . The performance of polymer TECs can be tuned depending on the polymer-I 3 - interactions, and starch showed notable performance as compared to PVP, with increased output power by a factor of two.

Original languageEnglish
Pages (from-to)472-478
Number of pages7
JournalSustainable Energy and Fuels
Volume2
Issue number2
DOIs
Publication statusPublished - Jan 1 2018

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Electrochemical cells
Polysaccharides
Seebeck coefficient
Ions
Polymers
Starch
Oxidation-Reduction
Temperature
Electrodes
Electric potential
Costs

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Thermo-electrochemical cells empowered by selective inclusion of redox-active ions by polysaccharides. / Zhou, H.; Yamada, Teppei; Kimizuka, Nobuo.

In: Sustainable Energy and Fuels, Vol. 2, No. 2, 01.01.2018, p. 472-478.

Research output: Contribution to journalArticle

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abstract = "Thermo-electrochemical cells (TECs) are a class of thermoelectric materials that offer high thermoelectric voltage (Seebeck coefficient) with potentially lower costs compared to the conventional thermoelectric materials. To maximize the potential of TECs, we show that the Seebeck coefficient of TECs with a redox pair of I - /I 3 - is enhanced by introducing polymer-ion interactions. Starch and polyvinylpyrrolidone (PVP) are employed as polymeric hosts for I 3 - ions. The effective concentration of free I 3 - ions in the cold cell decreases due to their selective inclusion in host polymers, resulting in an increase of the [I - ]/[I 3 - ] ratio. Meanwhile in the higher temperature cell, the inclusion of I 3 - ions by host polymers is less effective and the [I - ]/[I 3 - ] ratio is mostly determined by the intrinsic equilibrium without polymers. Consequently, the two electrode cells differing in temperature show a considerable difference in the concentration of I 3 - ions, which causes a significant increase of the Seebeck coefficient up to 1.5 mV K -1 . The performance of polymer TECs can be tuned depending on the polymer-I 3 - interactions, and starch showed notable performance as compared to PVP, with increased output power by a factor of two.",
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N2 - Thermo-electrochemical cells (TECs) are a class of thermoelectric materials that offer high thermoelectric voltage (Seebeck coefficient) with potentially lower costs compared to the conventional thermoelectric materials. To maximize the potential of TECs, we show that the Seebeck coefficient of TECs with a redox pair of I - /I 3 - is enhanced by introducing polymer-ion interactions. Starch and polyvinylpyrrolidone (PVP) are employed as polymeric hosts for I 3 - ions. The effective concentration of free I 3 - ions in the cold cell decreases due to their selective inclusion in host polymers, resulting in an increase of the [I - ]/[I 3 - ] ratio. Meanwhile in the higher temperature cell, the inclusion of I 3 - ions by host polymers is less effective and the [I - ]/[I 3 - ] ratio is mostly determined by the intrinsic equilibrium without polymers. Consequently, the two electrode cells differing in temperature show a considerable difference in the concentration of I 3 - ions, which causes a significant increase of the Seebeck coefficient up to 1.5 mV K -1 . The performance of polymer TECs can be tuned depending on the polymer-I 3 - interactions, and starch showed notable performance as compared to PVP, with increased output power by a factor of two.

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