Recent progress on the thermoelectric effect for electrochemistry

Li, Zhipeng; Jiang, Jing; He, Xinrui; Wang, Chao; Niu, Yi

doi:10.1039/d4ta00256c

J. Mater. Chem. A

2024

DOI: 10.1039/d4ta00256c

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Recent progress on the thermoelectric effect for electrochemistry

Zhipeng Li,

Jing Jiang,

Xinrui He

et al.

Abstract: Electrochemical-based energy storage/energy conversion devices still face the challenge of poor performance, and it is urgent to develop a new strategy to address it. Recently, the strategy of thermoelectric effect...

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Cited by 2 publications

References 113 publications

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Exploring Pyrazine‐Based Organic Redox Couples for Enhanced Thermoelectric Performance in Wearable Energy Harvesters

Lee,

Hsu,

Wang

et al. 2024

Small

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Thermoelectric generators (TEGs) based on thermogalvanic cells can convert low‐temperature waste heat into electricity. Organic redox couples are well‐suited for wearable devices due to their nontoxicity and the potential to enhance the ionic Seebeck coefficient through functional‐group modifications. Pyrazine‐based organic redox couples with different functional groups is comparatively analyzed through cyclic voltammetry under varying temperatures. The results reveal substantial differences in entropy changes with temperature and highlight 2,5‐pyrazinedicarboxylic acid dihydrate (PDCA) as the optimal candidate. How the functional groups of the pyrazine compounds impact the ionic Seebeck coefficient is examined, by calculating the electrostatic potential based on density functional theory. To evaluate the thermoelectric properties, PDCA is integrated in different concentrations into a double‐network hydrogel comprising poly(vinyl alcohol) and polyacrylamide. The resulting champion device exhibits an impressive ionic Seebeck coefficient (Si) of 2.99 mV K−1, with ionic and thermal conductivities of ≈67.6 µS cm−1 and ≈0.49 W m−1 K−1, respectively. Finally, a TEG is constructed by connecting 36 pieces of 20 × 10−3 m PDCA‐soaked hydrogel in series. It achieves a maximum power output of ≈0.28 µW under a temperature gradient of 28.3 °C and can power a small light‐emitting diode. These findings highlight the significant potential of TEGs for wearable devices.

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Exploring Pyrazine‐Based Organic Redox Couples for Enhanced Thermoelectric Performance in Wearable Energy Harvesters

Lee,

Hsu,

Wang

et al. 2024

Small

View full text Add to dashboard Cite

show abstract

Construction and application of thermogalvanic hydrogels

Liu,

Fang,

Lyu

et al. 2024

Soft Sci

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Low-grade heat (below 373 Kelvins) is abundant and ubiquitous, yet the lack of cost-effective recovery technologies frequently impedes its effective utilization. The advent of thermogalvanic hydrogel thermocells has garnered significant attention due to their high thermopower, inherent flexibility, low cost, and scalability. Thermogalvanic hydrogels have significantly enhanced their thermoelectric performance, resulting in the development of functional materials that exhibit flexibility, stretchability, self-healing, and frost resistance. However, there are substantial challenges in developing multifunctional thermogalvanic hydrogels that combine high power density and efficiency with practical applicability. This review discusses the synthesis of the novel redox couple, improving the performance of electrolytes to increase thermopower, creating electrodes with extensive surface areas for better current density and flexibility, and optimizing thermocell structure design to improve performance further. This comprehensive review aims to propel progress toward higher performance levels and broader applications of thermogalvanic hydrogel thermocells.

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Recent progress on the thermoelectric effect for electrochemistry

Abstract: Electrochemical-based energy storage/energy conversion devices still face the challenge of poor performance, and it is urgent to develop a new strategy to address it. Recently, the strategy of thermoelectric effect...

Cited by 2 publications

References 113 publications

Exploring Pyrazine‐Based Organic Redox Couples for Enhanced Thermoelectric Performance in Wearable Energy Harvesters

Exploring Pyrazine‐Based Organic Redox Couples for Enhanced Thermoelectric Performance in Wearable Energy Harvesters

Construction and application of thermogalvanic hydrogels

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