Mesogenic polymer composites for temperature-programmable thermoelectric ionogels

Park, Sienoh; Kim, Byeonggwan; Cho, Cheol-Hyun; Kim, Eunkyoung

doi:10.1039/d2ta03120e

Cited by 9 publications

(4 citation statements)

References 51 publications

(68 reference statements)

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“…This might be because the addition of PDDA enhanced the selective migration of Ca 2+ . 37 As shown in Fig. 5d and S7,† the difference of the ratio of Cl to Ca at the hot and cold ends of HTIG3 was significantly greater than that at HTIG0, which confirmed the above view.…”

Section: Resultssupporting

confidence: 78%

A high-thermopower ionic hydrogel for intelligent fire protection

Jiang

Lai

et al. 2022

J. Mater. Chem. A

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Section: Resultssupporting

confidence: 78%

A high-thermopower ionic hydrogel for intelligent fire protection

Jiang

Lai

et al. 2022

J. Mater. Chem. A

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“…However, the ionic conductivity of ionogels is not linear to the ionic liquid loading because the ionic liquid loading can also affect the ionic mobilities. 42 The ion concentrations are related to the ion dissociation, as well. The presence of water can facilitate the ion dissociation and, thus, increase the ionic conductivity.…”

mentioning

confidence: 99%

“…The ionic conductivity of an ionic conductor depends on the concentrations ( n + and n – ), mobilities (μ + and μ – ), and valences ( C + and C – ) of the cations and anions, σ i = | en + C + μ + | + | en – C – μ – |. , When an ionogel has a high ionic liquid loading, the ionic concentration is higher, thereby giving rise to a higher ionic conductivity. However, the ionic conductivity of ionogels is not linear to the ionic liquid loading because the ionic liquid loading can also affect the ionic mobilities . The ion concentrations are related to the ion dissociation, as well.…”

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confidence: 99%

Soret Effect of Ionic Liquid Gels for Thermoelectric Conversion

Cheng

Ouyang

2022

J. Phys. Chem. Lett.

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Cations and anions can accumulate at the two ends of an ionic conductor under temperature gradient, which is the so-called Soret effect. This can generate a voltage between the two electrodes, and the thermopower can be higher than that of the electronic conductors because of the Seebeck effect by 1–2 orders in magnitude. The thermoelectric properties of ionic conductors depend on the ionic thermopower, ionic conductivity, and thermal conductivity. Compared with other ionic conductors, like liquid electrolytes and hydrogels, ionogels made of an ionic liquid and a gelator can have the advantages of high thermopower and high stability. Great progress was recently made to improve the ionic conductivity and/or ionic thermopower of ionogels. They can be used in ionic thermoelectric capacitors (ITECs) to harvest heat. In addition, they can be integrated with electronic thermoelectric materials to harvest heat from both temperature gradient and temperature fluctuation, which can be caused by waste heat.

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“…Unfortunately, as compared to cation-selective i-TE, reports on anion-selective i-TEs are very limited in the literature. The scattered efforts to develop negative i-TE include the generation of massive thermovoltages from an ionic hydrogel of polyvinyl alcohol and sodium hydroxide (−37.61 mV K −1 ), 11 PDDAC (−19 mV K −1 ), 12 bisulfate transport in hydrogels 13 (−25 mV K −1 ), FeCl 3 doped poly(3-hexylthiophene) films 14 (−15 mV K −1 ), liquid crystalline ionogels 15 (−5.9 mV K −1 ), calcium ion (Ca 2+ ) coordinated bacterial cellulose (CaBC) 16 (−27.2 mV K −1 ) and PEDOT:PSS (−18.2 mV K −1 ). 17…”

Section: Introductionmentioning

confidence: 99%