Supramolecular Thermo-Electrochemical Cells

Enhanced Thermoelectric Performance by Host-Guest Complexation and Salt-Induced Crystallization

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Thermo-electrochemical cells have potential to generate thermoelectric voltage 1 order higher than that given by semiconductor materials. To overcome the current issues in thermoelectric energy conversion, it is of paramount importance to grow and fulfill the full potential of thermo-electrochemical cells. Here we report a rational supramolecular methodology that yielded the highest Seebeck coefficient of ca. 2.0 mV K-1 around ambient temperatures. This is based on the encapsulation of triiodide ions in α-cyclodextrin, whose equilibrium is shifted to the complexation at lower temperatures, whereas it is inverted at elevated temperatures. This temperature-dependent host-guest interaction provides a concentration gradient of redox ion pairs between two electrodes, leading to the eminent performance of the thermo-electrochemical cells. The figure of merit for this system, zT reached a high value of 5 × 10-3. The introduction of host-guest chemistry to thermoelectric cells thus provides a new perspective in thermoelectric energy conversion.

Original languageEnglish
Pages (from-to)10502-10507
Number of pages6
JournalJournal of the American Chemical Society
Volume138
Issue number33
DOIs
Publication statusPublished - Aug 24 2016

Fingerprint

Electrochemical cells
Crystallization
Complexation
Thermoelectric energy conversion
Salts
Temperature
Ions
Semiconductors
Seebeck coefficient
Cyclodextrins
Encapsulation
Oxidation-Reduction
Electrodes
Semiconductor materials
Electric potential

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

@article{a639570b4b0f493c9bfd46b9ddb6b9a4,
title = "Supramolecular Thermo-Electrochemical Cells: Enhanced Thermoelectric Performance by Host-Guest Complexation and Salt-Induced Crystallization",
abstract = "Thermo-electrochemical cells have potential to generate thermoelectric voltage 1 order higher than that given by semiconductor materials. To overcome the current issues in thermoelectric energy conversion, it is of paramount importance to grow and fulfill the full potential of thermo-electrochemical cells. Here we report a rational supramolecular methodology that yielded the highest Seebeck coefficient of ca. 2.0 mV K-1 around ambient temperatures. This is based on the encapsulation of triiodide ions in α-cyclodextrin, whose equilibrium is shifted to the complexation at lower temperatures, whereas it is inverted at elevated temperatures. This temperature-dependent host-guest interaction provides a concentration gradient of redox ion pairs between two electrodes, leading to the eminent performance of the thermo-electrochemical cells. The figure of merit for this system, zT reached a high value of 5 × 10-3. The introduction of host-guest chemistry to thermoelectric cells thus provides a new perspective in thermoelectric energy conversion.",
author = "Hongyao Zhou and Teppei Yamada and Nobuo Kimizuka",
year = "2016",
month = "8",
day = "24",
doi = "10.1021/jacs.6b04923",
language = "English",
volume = "138",
pages = "10502--10507",
journal = "Journal of the American Chemical Society",
issn = "0002-7863",
publisher = "American Chemical Society",
number = "33",

}

TY - JOUR

T1 - Supramolecular Thermo-Electrochemical Cells

T2 - Enhanced Thermoelectric Performance by Host-Guest Complexation and Salt-Induced Crystallization

AU - Zhou, Hongyao

AU - Yamada, Teppei

AU - Kimizuka, Nobuo

PY - 2016/8/24

Y1 - 2016/8/24

N2 - Thermo-electrochemical cells have potential to generate thermoelectric voltage 1 order higher than that given by semiconductor materials. To overcome the current issues in thermoelectric energy conversion, it is of paramount importance to grow and fulfill the full potential of thermo-electrochemical cells. Here we report a rational supramolecular methodology that yielded the highest Seebeck coefficient of ca. 2.0 mV K-1 around ambient temperatures. This is based on the encapsulation of triiodide ions in α-cyclodextrin, whose equilibrium is shifted to the complexation at lower temperatures, whereas it is inverted at elevated temperatures. This temperature-dependent host-guest interaction provides a concentration gradient of redox ion pairs between two electrodes, leading to the eminent performance of the thermo-electrochemical cells. The figure of merit for this system, zT reached a high value of 5 × 10-3. The introduction of host-guest chemistry to thermoelectric cells thus provides a new perspective in thermoelectric energy conversion.

AB - Thermo-electrochemical cells have potential to generate thermoelectric voltage 1 order higher than that given by semiconductor materials. To overcome the current issues in thermoelectric energy conversion, it is of paramount importance to grow and fulfill the full potential of thermo-electrochemical cells. Here we report a rational supramolecular methodology that yielded the highest Seebeck coefficient of ca. 2.0 mV K-1 around ambient temperatures. This is based on the encapsulation of triiodide ions in α-cyclodextrin, whose equilibrium is shifted to the complexation at lower temperatures, whereas it is inverted at elevated temperatures. This temperature-dependent host-guest interaction provides a concentration gradient of redox ion pairs between two electrodes, leading to the eminent performance of the thermo-electrochemical cells. The figure of merit for this system, zT reached a high value of 5 × 10-3. The introduction of host-guest chemistry to thermoelectric cells thus provides a new perspective in thermoelectric energy conversion.

UR - http://www.scopus.com/inward/record.url?scp=84983637762&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84983637762&partnerID=8YFLogxK

U2 - 10.1021/jacs.6b04923

DO - 10.1021/jacs.6b04923

M3 - Article

VL - 138

SP - 10502

EP - 10507

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 33

ER -