Jump to main content
Jump to site search


Hexakis(2,3,6-tri-O-methyl)-α-cyclodextrin–I5 complex in aqueous I/I3 thermocells and enhancement in the Seebeck coefficient

Author affiliations

Abstract

A large Seebeck coefficient (Se) of 1.9 mV K−1 was recorded for the I/I3 thermocell by utilizing the host-guest complexation of hexakis(2,3,6-tri-O-methyl)-α-cyclodextrin (Me18-α-CD) with the oxidized iodide species. The thermocell measurement and UV-vis spectroscopy unveiled the formation of an Me18-α-CD–pentaiodide (I5) complex, which is in remarkable contrast to the triiodide complex α-CD–I3 previously reported. Although the precipitation of the α-CD–I3 complex in the presence of an electrolyte such as potassium chloride is a problem in thermocells, this issue was solved by using Me18-α-CD as a host compound. The absence of precipitation in the Me18-α-CD and I/I3 system containing potassium chloride not only improved the Se of the I/I3 thermocell, but also significantly enhanced the temporal stability of its power output. This is the first observation that I5 species is formed in aqueous solution in a thermocell. Furthermore, the solution equilibrium of the redox couples was controlled by tuning the chemical structure of the host compounds. Thus, the integration of host-guest chemistry with redox couples extends the application of thermocells.

Graphical abstract: Hexakis(2,3,6-tri-O-methyl)-α-cyclodextrin–I5− complex in aqueous I−/I3− thermocells and enhancement in the Seebeck coefficient

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Aug 2018, accepted on 21 Oct 2018 and first published on 22 Oct 2018


Article type: Edge Article
DOI: 10.1039/C8SC03821J
Citation: Chem. Sci., 2019, Advance Article
  • Open access: Creative Commons BY license
  •   Request permissions

    Hexakis(2,3,6-tri-O-methyl)-α-cyclodextrin–I5 complex in aqueous I/I3 thermocells and enhancement in the Seebeck coefficient

    Y. Liang, T. Yamada, H. Zhou and N. Kimizuka, Chem. Sci., 2019, Advance Article , DOI: 10.1039/C8SC03821J

    This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements