Tailoring Intermolecular Interactions Towards High‐Performance Thermoelectric Ionogels at Low Humidity

Zhao, Wei; Sun, Tongming; Zheng, Yiwei; Zhang, Qihao; Huang, Aibin; Wang, Bijia; Jiang, Wan

doi:10.1002/advs.202201075

Cited by 42 publications

(29 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ionogels should have a high ionic conductivity and high ionic Seebeck coefficient to have high thermoelectric properties. A couple of methods were recently reported to increase the ionic conductivity and/or the ionic Seebeck coefficient. − The ZT i value of ionogels was rapidly increased to >6 …”

mentioning

confidence: 99%

Soret Effect of Ionic Liquid Gels for Thermoelectric Conversion

Cheng

Ouyang

2022

J. Phys. Chem. Lett.

View full text Add to dashboard Cite

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.

show abstract

mentioning

confidence: 99%

Soret Effect of Ionic Liquid Gels for Thermoelectric Conversion

Cheng

Ouyang

2022

J. Phys. Chem. Lett.

View full text Add to dashboard Cite

show abstract

“…In comparison, integrate performance reported previously is summarized in Figure 4f. [37][38][39][40][41][42][43] Hydrophilic polymer cannot prevent ions from leaking out because water molecules tend to combine with polymer matrix and replace the mobile ions. [38,40,41] Although hydrophobic polymer avoids penetration of water, some of them lack interactions with ions, so that the easily hydrated ions tend to be dissolved in the water.…”

Section: Mechanical and Electrical Properties Of Puf-ilmentioning

confidence: 99%

Highly Conductive and Underwater Stable Ionic Skin for All‐Day Epidermal Biopotential Monitoring

Chen

Guo

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Epidermal biopotential monitoring is an essential part of wearable healthcare. For 24 × 7 h detection of electrophysiological signals, commercialized gel electrodes cannot satisfy the demands, in particular for monitoring in humidity or underwater. Epidermal electrodes that can be stable and operated underwater are required. Here, a highly conductive and optically camouflaged ionic skin for epidermal biopotential monitoring under aquatic circumstances is designed. There is a fluorine‐dipole interaction system consisting of fluorine‐rich segment in the polyurethane backbone and fluorine‐cation bonded 1‐ethyl‐3‐methylimidazolium bis(trifluoromethyl‐sulfonyl) imide ([EMIM]+ [TFSI]−) ion pairs distributed in the polymer matrix. Benefitting from the fluorine‐cation interaction, the ionic skin gains remarkable ionic conductivity (1.04 × 10−3 S cm−1), high optical transmittance (92%), and improved mechanical strength (3.1 MPa of Young's modulus). Via cations caught by fluorine‐rich segments, its ionic conductivity can keep stable even by rinsing or fierce washing in water. The epidermal electrode based on such ionic skin can accurately measure a variety of electrophysiological signals undboth atmospheric and aquatic environments, exhibiting robust and excellent signal quality. As the first demonstration of ionic skin‐based electrophysiological electrodes, the ionic skin paves a new way for all‐day wearable healthcare.

show abstract

“…Generally, higher ILs loading in an IL/polymer system would enhance both α and σ i due to the increasing carrier concentration (Figure 4a). [22,28,36,37] In some cases, the α of binary ionogels has a more complicated behavior with IL loading varying. For instance, the α of EMIM-DCA/PVDF:HFP ionogel exhibited a V-shape dependence on the IL loading, which reached a minimum of 12.3 mV K −1 and a maximum of 26.1 mV K −1 at the IL loading of 50 and 80 wt.%, respectively (Figure 4b).…”

Section: Ionic Liquid and Hybridsmentioning

confidence: 99%

Ionic Organic Thermoelectrics with Impressively High Thermopower for Sensitive Heat Harvesting Scenarios

Pai

Tang

Zhao

et al. 2022

Advanced Energy Materials

View full text Add to dashboard Cite

As the worldwide energy crisis is worsened, thermoelectric materials that can harvest low‐grade waste heat and directly convert it into electricity provide promising alternative energy sources. Emerging ionic thermoelectrics (iTEs) have recently attracted widespread attention thanks to their impressively high thermopower that can reach hundreds of times more than conventional electronic thermoelectrics (eTEs). Based on the Soret effect, the performances of iTEs depend on the thermo‐diffusion of mobile ions in electrolytes, resulting in electrical characteristics distinct from eTE materials and opening up additional potential applications of thermoelectrics. Among these materials, organics‐based iTEs (i‐OTEs) provide unique advantages such as low‐cost, light‐weight, and eco‐friendliness, thereby offering more promising application scenarios that can utilize dissipated heat, for example, from human bodies or mobile devices. This concise review begins with the comparison of iTE and eTE, and then discusses their different mechanisms and applied devices in detail. Next, the recent advances of i‐OTEs will be in‐depth highlighted, including the merits and weaknesses of representative types of materials, effects of additives, and effective strategies for performance optimization. Finally, the state‐of‐the‐art achievements of i‐OTEs are summarized, and an overview is provided of the existing challenges and an outlook of prospective development and applications in future efforts.

show abstract

Tailoring Intermolecular Interactions Towards High‐Performance Thermoelectric Ionogels at Low Humidity

Cited by 42 publications

References 44 publications

Soret Effect of Ionic Liquid Gels for Thermoelectric Conversion

Soret Effect of Ionic Liquid Gels for Thermoelectric Conversion

Highly Conductive and Underwater Stable Ionic Skin for All‐Day Epidermal Biopotential Monitoring

Ionic Organic Thermoelectrics with Impressively High Thermopower for Sensitive Heat Harvesting Scenarios

Contact Info

Product

Resources

About