Abstract
A large Seebeck coefficient (S e ) of 1.9 mV K -1 was recorded for the I - /I 3 - thermocell by utilizing the host-guest complexation of hexakis(2,3,6-tri-O-methyl)-α-cyclodextrin (Me 18 -α-CD) with the oxidized iodide species. The thermocell measurement and UV-vis spectroscopy unveiled the formation of an Me 18 -α-CD-pentaiodide (I 5 - ) complex, which is in remarkable contrast to the triiodide complex α-CD-I 3 - previously reported. Although the precipitation of the α-CD-I 3 - complex in the presence of an electrolyte such as potassium chloride is a problem in thermocells, this issue was solved by using Me 18 -α-CD as a host compound. The absence of precipitation in the Me 18 -α-CD and I - /I 3 - system containing potassium chloride not only improved the S e of the I - /I 3 - thermocell, but also significantly enhanced the temporal stability of its power output. This is the first observation that I 5 - 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.
| Original language | English |
|---|---|
| Pages (from-to) | 773-780 |
| Number of pages | 8 |
| Journal | Chemical Science |
| Volume | 10 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Jan 1 2019 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
Cite this
Hexakis(2,3,6-tri- : O -methyl)-α-cyclodextrin-I 5 - complex in aqueous I - /I 3 - thermocells and enhancement in the Seebeck coefficient. / Liang, Yimin; Yamada, Teppei; Zhou, Hongyao; Kimizuka, Nobuo.
In: Chemical Science, Vol. 10, No. 3, 01.01.2019, p. 773-780.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hexakis(2,3,6-tri-
T2 - O -methyl)-α-cyclodextrin-I 5 - complex in aqueous I - /I 3 - thermocells and enhancement in the Seebeck coefficient
AU - Liang, Yimin
AU - Yamada, Teppei
AU - Zhou, Hongyao
AU - Kimizuka, Nobuo
PY - 2019/1/1
Y1 - 2019/1/1
N2 - A large Seebeck coefficient (S e ) of 1.9 mV K -1 was recorded for the I - /I 3 - thermocell by utilizing the host-guest complexation of hexakis(2,3,6-tri-O-methyl)-α-cyclodextrin (Me 18 -α-CD) with the oxidized iodide species. The thermocell measurement and UV-vis spectroscopy unveiled the formation of an Me 18 -α-CD-pentaiodide (I 5 - ) complex, which is in remarkable contrast to the triiodide complex α-CD-I 3 - previously reported. Although the precipitation of the α-CD-I 3 - complex in the presence of an electrolyte such as potassium chloride is a problem in thermocells, this issue was solved by using Me 18 -α-CD as a host compound. The absence of precipitation in the Me 18 -α-CD and I - /I 3 - system containing potassium chloride not only improved the S e of the I - /I 3 - thermocell, but also significantly enhanced the temporal stability of its power output. This is the first observation that I 5 - 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.
AB - A large Seebeck coefficient (S e ) of 1.9 mV K -1 was recorded for the I - /I 3 - thermocell by utilizing the host-guest complexation of hexakis(2,3,6-tri-O-methyl)-α-cyclodextrin (Me 18 -α-CD) with the oxidized iodide species. The thermocell measurement and UV-vis spectroscopy unveiled the formation of an Me 18 -α-CD-pentaiodide (I 5 - ) complex, which is in remarkable contrast to the triiodide complex α-CD-I 3 - previously reported. Although the precipitation of the α-CD-I 3 - complex in the presence of an electrolyte such as potassium chloride is a problem in thermocells, this issue was solved by using Me 18 -α-CD as a host compound. The absence of precipitation in the Me 18 -α-CD and I - /I 3 - system containing potassium chloride not only improved the S e of the I - /I 3 - thermocell, but also significantly enhanced the temporal stability of its power output. This is the first observation that I 5 - 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.
UR - http://www.scopus.com/inward/record.url?scp=85060173360&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85060173360&partnerID=8YFLogxK
U2 - 10.1039/c8sc03821j
DO - 10.1039/c8sc03821j
M3 - Article
AN - SCOPUS:85060173360
VL - 10
SP - 773
EP - 780
JO - Chemical Science
JF - Chemical Science
SN - 2041-6520
IS - 3
ER -