Enhanced thermo-electrochemical power using carbon nanotube additives in ionic liquid redox electrolytes

Salazar, Pablo F.; Stephens, Sai T.; Kazim, Ali Hussain; Pringle, Jennifer M.; Cola, Baratunde A.

doi:10.1039/c4ta04749d

Cited by 54 publications

(37 citation statements)

References 22 publications

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“…On the other hand, direct measurements of thermoelectric voltage in charged colloidal suspensions have rarely been reported. 14 Here, we investigate one such charged colloidal suspension, namely, ionically stabilized ferrofluid in dimethyl sulfoxide (DMSO). Ferrofluid was chosen not only because of the high Soret coefficients 13,15 of NPs among other colloidal suspensions with nanometric particle size but also because of their magnetic nature which may offer an additional parameter (magnetic field 16,17 ) to control the thermoelectric property of colloidal suspensions.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectricity and thermodiffusion in charged colloids

Huang

Roger

Bonetti

et al. 2015

The Journal of Chemical Physics

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The Seebeck and Soret coefficients of ionically stabilized suspension of maghemite nanoparticles in dimethyl sulfoxide are experimentally studied as a function of nanoparticle volume fraction. In the presence of a temperature gradient, the charged colloidal nanoparticles experience both thermal drift due to their interactions with the solvent and electric forces proportional to the internal thermoelectric field. The resulting thermodiffusion of nanoparticles is observed through forced Rayleigh scattering measurements, while the thermoelectric field is accessed through voltage measurements in a thermocell. Both techniques provide independent estimates of nanoparticle's entropy of transfer as high as 82 meV K(-1). Such a property may be used to improve the thermoelectric coefficients in liquid thermocells.

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Section: Introductionmentioning

confidence: 99%

Thermoelectricity and thermodiffusion in charged colloids

Huang

Roger

Bonetti

et al. 2015

The Journal of Chemical Physics

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“…[ 18 ] Ionic liquid, especially composited with redox couple additives, could also play an important role in thermoelectric applications. [ 19,20 ] However, rarely attention has been paid to the utilization of pure ionic liquid on thermoelectric devices under low grade heat (lower than 130 °C), [21][22][23] which is widely distributed as forms of geothermy, waste heat derived from highly heat dissipative apparatus and automobile exhaust pipe, [ 24 ] and even as the form of biological heat source, mainly on the basis of homoiothermous skin and tissue temperature. [ 25 ] Without the participation of chemical redox reaction on the interface between pure ionic liquid and electrode, Seebeck effect of ionic liquid is mainly caused by the rearrangement and migration of ions on the wileyonlinelibrary.com confi rming the reliability and repeatability of thermoelectric device.…”

mentioning

confidence: 99%

Flexible and Self‐Healing Thermoelectric Converters Based on Thermosensitive Liquids at Low Temperature Gradient

Jia

Tao

Wang

2016

Adv Elect Materials

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electrode surface. The mechanism of thermal harvesting is similar with thermal charge of ionic solution, which is confirmed by previous researches on non-redox ionic thermally capacitive cells. [26,27] It is of importance that Seebeck coefficient (S), power factor (PF), and thermoelectric figure of merit (ZT) are three important parameters used to evaluate the thermoelectric performance of potential thermoelectric materials. To maximize the thermoelectric performance, lower thermal conductivity ( ) κ , higher electrical conductivity (σ), and S are needed according to Equation (1)Herein, we designed a flexible and self-healing thermoelectric converter based on thermosensitive liquids with low temperature gradient. Ionic liquid acting as a thermosensitive fluid was employed owing to their intrinsic merits of liquid materials. The converter generates thermoelectric potential variation of tens of millivolt under low temperature gradient on account of asymmetrically heating. Notably, ionic liquids could also be integrated with flexible substrates or functional nanoparticles to render thermoelectric converter possessing the performance of flexibility, self-healing property, and photo-thermo-electric (PTE) conversion.Four imidazolium cations with different alkyl side chain and two anions including inorganic and organic species were combined to investigate thermoelectric performances of seven ionic liquids, excluding 1-ethyl-3-methyl imidazolium hexafluorophosphate ([EMIm][PF 6 ]) behaving as solid at room temperature. A measurement setup for monitoring the realtime change of open-circuit potential of ionic liquid thermoelectric converter (ILTE converter) was constructed to evaluate the S as shown in Figure 1a,b. The ILTE converter placed on two Peltier devices was heated at left end and kept the other end unheated at room temperature (25 °C). Temperature gradient between two ends of ILTE converter was well maintained owing to poor thermal conductivity of ionic liquid, confirmed by the measured thermal conductivity and thermal imaging of infrared camera (Table 1, Figure S8 and Movie S1, Supporting Information). Typical ILTE converter filled with [EMIm][Tf 2 N] was tested for potential variation generated from alternate heating and cooling of Peltier device (Figure 1c). The potential of left electrode immediately decreases when heated left end of converter. Clearly, this phenomenon results from the different ionic mobility, and cation-anion, ion-metal interactions. With unchanged ionic arrangement on right unheated electrode, ionic rearrangement, and migration on heated end lead to the change of open-circuit potential. The potential variation of converter as the value of 42.2 mV shows the approximately same value under fixed temperature gradient of 26.3 K for six cycles, Concerns of urgent global issues on energy crisis and sustainable development have pushed researchers to find new energy sources and novel strategies to utilize the waste energy in the ambient surroundings. Thermoelectric materials are a kind of promising...

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“…Однако если экспериментальных и теоретических работ по исследованию явления термодиффузии в коллоидных растворах и суспензиях в настоящее время известно много, то термоэлектрические явления изучаются достаточно редко. Помимо работ [9,10] можно отметить [14,15]. Интерес к термоэлектрическим свойствам коллоидных систем обусловлен прежде всего перспективами их применения в термоэлектрохимических генераторах [16].…”

Section: экспериментальные результаты и их обсуждениеunclassified