Ionic thermoelectric materials and devices

Zhao, Dan; Würger, Aloïs; Crispin, Xavier

doi:10.1016/j.jechem.2021.02.022

Cited by 77 publications

(77 citation statements)

References 119 publications

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“…The interactions on the ions coming from the polymer matrix and the surrounding ionic environment strongly influence the ionic heat of transport ( 6 , 10 , 11 ). Especially in a highly concentrated ionic environment like the IL, ion-ion interactions are prominent and contribute significantly to the heat of transport ( 24 ). It is therefore expected that adding specific salts into the binary ionogel can regulate the ionic environment and, in turn, selectively tune the ion interactions or heat of transport of ions in the system, consequently altering the sign and magnitude of the ionic thermopower.…”

Section: Resultsmentioning

confidence: 99%

Giant and bidirectionally tunable thermopower in nonaqueous ionogels enabled by selective ion doping

et al. 2022

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Ionic thermoelectrics show great potential in thermal sensing owing to their ultrahigh thermopower, low cost, and ease in production. However, the lack of effective n-type ionic thermoelectric materials seriously hinders their applications. Here, we report giant and bidirectionally tunable thermopowers within an ultrawide range from −15 to +17 mV K −1 in solid ionic liquid-based ionogels. Particularly, a record high negative thermopower of −15 mV K −1 is achieved in the ternary ionogel, rendering it among the best n-type ionic thermoelectric materials under the same condition. A thermopower regulation strategy through ion doping to selectively induce ion aggregates to enhance ion-ion interactions is proposed. These selective ion interactions are found to be decisive in modulating the sign and magnitude of the thermopower in the ionogels. A prototype wearable device integrated with 12 p-n pairs is demonstrated with a total thermopower of 0.358 V K −1 , showing promise for ultrasensitive thermal detection.

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Section: Resultsmentioning

confidence: 99%

Giant and bidirectionally tunable thermopower in nonaqueous ionogels enabled by selective ion doping

et al. 2022

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“…The ionic contribution to the Seebeck coefficient can be quantified via S ionic F σT z (i) C (i) D T , where D T is the Soret thermal diffusion coefficient of the ions in m 2 s −1 K −1 [261]. In a conventional ionic TE, the Soret effect [262] creates a voltage on top of the electronic contribution. The large Seebeck coefficients in ionic TEGs could originate from temperature-dependent dissociation of ions [263].…”

Section: Ionic Thermoelectricsmentioning

confidence: 99%

Soft Ionics: Governing Physics and State of Technologies

Tepermeister

Bosnjak²,

Dai³

et al. 2022

Front. Phys.

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Soft ionic materials combine charged mobile species and tailored polymer structures in a manner that enables a wide array of functional devices. Traditional metal and silicon electronics are limited to two charge carriers: electrons and holes. Ionic devices hold the promise of using the wide range of chemical and molecular properties of mobile ions and polymer functional groups to enable flexible conductors, chemically specific sensors, bio-compatible interfaces, and deformable digital or analog signal processors. Stand alone ionic devices would need to have five key capabilities: signal transmission, energy conversion/harvesting, sensing, actuation, and signal processing. With the great promise of ionically-conducting materials and ionic devices, there are several fields working independently on pieces of the puzzle. These fields range from waste-water treatment research to soft robotics and bio-interface research. In this review, we first present the underlying physical principles that govern the behavior of soft ionic materials and devices. We then discuss the progress that has been made on each of the potential device components, bringing together findings from a range of research fields, and conclude with discussion of opportunities for future research.

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“…Recently, ionic TE materials (ITE) such as liquid electrolytes, ionic hydrogels and ionogels emerged as next generation TE materials due to their high TE properties particularly high ionic Seebeck coefficient. 34–37 For example, ionogels consisting of an ionic liquid (IL) can exhibit an ionic Seebeck coefficient of tens of mV K −1 , 38,39 higher than that of the electronic TE materials by 2–3 orders of magnitude. 14,40,41 Additionally, the ionogels using a stretchable gelator can exhibit high mechanical stretchability, 42 and they can be thus used as a wearable energy generator by harvesting body heat.…”

Section: Introductionmentioning

confidence: 99%