Ion Exchange Induced Efficient N‐Type Thermoelectrics in Solid‐State

Zhou, Ying; Yao, Canglang; Lin, Xiangxin; Oh, Jiyeon; Tian, Jinjin; Yang, Wei; He, Yongjie; Ma, Yue; Yang, Ke; Ai, Bin; Sun, Kuan; Fu, Zhengping; Lu, Yalin; Li, Feng; Yang, Changduk; Chen, Shanshan

doi:10.1002/adfm.202214563

Cited by 17 publications

(3 citation statements)

References 47 publications

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“…In this section, the structure-property correlation of the PPET-P sample is discussed by taking the substrate and hot-pressing effect into consideration. As demonstrated in the previous works, EMIM:TCM would interact strongly with the PEDOT:PSS via ion exchanges [37,38], which enables the structural rearrangement of PEDOT chains that form long-range ordered conductive paths when they are dried in glass or silicon substrates. The long-range ordered conductive paths of PPET-G have been revealed by the synchrotron radiation small-angle X-ray scattering and micro-Fourier transform infrared spectroscopy results, as demonstrated by Li et al [4].…”

Section: Resultsmentioning

confidence: 76%

Highly Flexible and Foldable Paper-Based Thermoelectric Generator Prepared with Post-Treatment-Free PEDOT:PSS Hybrid Ink

Chen,

He,

Liu

et al. 2023

Polymers

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Paper-based thermoelectric (PTE) generators have recently emerged as a green technology that can help alleviate environment pollution and the energy crisis. In this work, a PTE generator was prepared by coating a post-treatment-free thermoelectric ink consisting of poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate (PEDOT:PSS) doped with 1-ethyl-3-methylimidazolium:tricyanomethanide (EMIM:TCM) onto the card paper. By tuning the molar concentration of the EMIM:TCM to 0.17 M and with hot-pressing, the PTE generator showed a decent power factor (PF) value of 6.82 μW m−1 K−2, which was higher than the values of PTE in the literature. This phenomenon could be attributed to the synergistic effect of high-performance thermoelectric ink (i.e., PF = 175 μW m−1 K−2 when deposited on glass slide) and the hot-pressing. The hot-pressing enhanced the packing density of cellulose fibers and the associated PEDOT:PSS hybrid, which enabled the formation of long-range conductive paths. In addition, the PTE had good mechanical stability, indicated by no significant change of the power factor values after cyclic folding 10,000 times. Moreover, the structure of as-prepared PTE could be easily tuned into different shapes that are promising for the preparation of flexible wearable thermoelectric generators.

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Section: Resultsmentioning

confidence: 76%

Highly Flexible and Foldable Paper-Based Thermoelectric Generator Prepared with Post-Treatment-Free PEDOT:PSS Hybrid Ink

Chen,

He,

Liu

et al. 2023

Polymers

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“…22−25 Furthermore, in the research conducted by Sun et al, significant breakthroughs have been made in the use of ion thermoelectric hydrogels relying on the Seebeck effect, showcasing the remarkable efficiency of thermoelectric hydrogels. 26,27 These quasi-solid-state thermoelectric coupler hydrogel electrolytes, through the manipulation of electrodes and electrolytes, have shown a certain level of efficiency in recovering thermal energy. 28,29 The primary research focus should be on the costeffectiveness of preparing thermoelectric hydrogels and their subsequent thermal energy absorption efficiency, as these are vital factors in the development of functional products for thermal energy recovery.…”

Section: Introductionmentioning

confidence: 99%

“…In previous studies, Hu et al have demonstrated the viability of thermoelectric hydrogels as thermal recovery generators . Zhang et al have focused on the sensing capabilities of thermoelectric couple hydrogels and have proven their wide range of applications in medical and daily life, offering new directions for smart living. − Additionally, Ma et al have successfully utilized thermoelectric hydrogels for thermal management, providing assistance in monitoring and protecting various heat-generating electronic devices. − Furthermore, in the research conducted by Sun et al, significant breakthroughs have been made in the use of ion thermoelectric hydrogels relying on the Seebeck effect, showcasing the remarkable efficiency of thermoelectric hydrogels. , These quasi-solid-state thermoelectric coupler hydrogel electrolytes, through the manipulation of electrodes and electrolytes, have shown a certain level of efficiency in recovering thermal energy. , The primary research focus should be on the cost-effectiveness of preparing thermoelectric hydrogels and their subsequent thermal energy absorption efficiency, as these are vital factors in the development of functional products for thermal energy recovery. An increase in heat absorption at the hot end of thermoelectric coupler hydrogels results in a greater temperature difference between the hot and cold ends, leading to enhanced power output .…”

Section: Introductionmentioning

confidence: 99%

A Superhydrophobic Self-Cleaning Flexible Hydrogel for Solar Thermoelectric Power Generation

Yang,

Wang,

et al. 2024

Energy Fuels

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Solar energy is one of the most promising energy sources, and its effective use has been continuously attracting widespread attention. Here, a solar-power thermoelectric system with self-cleaning capability was introduced based on a hydrogel. The hydrogel is formed through the polymerization of acrylic acid and acrylamide, resulting in the formation of compact ion channels within its structure. The mixed solvent of dimethyl sulfoxide and ethylene glycol plays a crucial role in this process by generating a significant number of hydrogen bonds, which enables the hydrogel to retain water and possess exceptional strength. Based on the coupling effect of the aforementioned two characteristics, the hydrogel exhibits a stable and remarkable electrochemical reaction facilitated by the synergistic action of NaCl and Fe(CN) 6 3−/4− . By leveraging the unique reaction mechanism within the hydrogel, we achieved significant improvements in multiple aspects of the system, including high Seebeck coefficient (2.1 mV K −1 ), excellent thermoelectric figure of merit (9.84 × 10 −3 ), good electrical conductivity (1.6 S m −1 ), and low thermal conductivity (0.251 W m −1 K −1 ). Furthermore, the integration of superhydrophobicity using fluoridated carbon nanotubes endows the system with photothermal and self-cleaning capability simultaneously. Particularly, the power density can reach 3.3 mW m −2 , which could lit the LED easily. Thus, this self-cleaning thermoelectric system represents a promising option for solar-energy-dependent outdoor solar energy utilization.

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Strong Tough Ionic Organohydrogels with Negative‐Thermopower via the Synergy of Coordination Interaction and Hofmeister Effect

Hu,

Li,

Chen

et al. 2024

Adv Funct Materials

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Ionic thermoelectric (i‐TE) gels have attracted widespread attention in flexible electronics due to their flexibility, leakage‐free, low toxicity, and converting low‐grade waste heat into electricity. For practical application, it is strongly desirable to fabricate negative‐thermopower (n‐type) i‐TE gels with excellent mechanical performances, which is still a big challenge. Herein, a multi‐hierarchical network structure is proposed to simultaneously improve the TE and mechanical performance. Such structure including hierarchical hydrogen bonds, coordination bonds, and dense polymer chains is realized via the synergy of the coordination effect of polymer to cations and the Hofmeister effect of anions to polymer. As a result, the optimized gel exhibits not only negative thermopower up to −3.69 mV K−1 with a conductivity of 0.15 S m−1 at room temperature, but also outstanding tensile strength (>6.7 MPa), elongation at break (>1100%), and toughness (>43 MJ m−3), which is the toughest n‐type i‐TE gel reported to date. In addition, these n‐type i‐TE gels present good freeze tolerance (−58.53 °C) and dry resistance. Furthermore, the application potentials of the i‐TE device are proven in converting human thermal power into electricity. These findings provide a new way to obtain high‐performance n‐type i‐TE materials by synergistic anion and cation action on polymers.

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Ion Exchange Induced Efficient N‐Type Thermoelectrics in Solid‐State

Cited by 17 publications

References 47 publications

Highly Flexible and Foldable Paper-Based Thermoelectric Generator Prepared with Post-Treatment-Free PEDOT:PSS Hybrid Ink

Highly Flexible and Foldable Paper-Based Thermoelectric Generator Prepared with Post-Treatment-Free PEDOT:PSS Hybrid Ink

A Superhydrophobic Self-Cleaning Flexible Hydrogel for Solar Thermoelectric Power Generation

Strong Tough Ionic Organohydrogels with Negative‐Thermopower via the Synergy of Coordination Interaction and Hofmeister Effect

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