Thermogalvanic Hydrogel for Synchronous Evaporative Cooling and Low-Grade Heat Energy Harvesting

Pu, Shirui; Liao, Yu‐Mei; Chen, Kyle; Fu, Jiahui; Zhang, Songlin; Ge, Lurong; Conta, Giorgio; Bouzarif, Sofia; Cheng, Ting; Hu, Xuejiao; Liu, Kang; Chen, Jun

doi:10.1021/acs.nanolett.0c00800

Cited by 192 publications

(135 citation statements)

References 31 publications

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“…The long-term P MAX /∆T 2 of our optimized device is comparable with reported gel electrolyte systems. [19,23,25,45] Once the p-type cell electrode was optimized, electrodes suitable for use with our developed PVA-FeCl 2/3 electrolytes (n-type) were investigated, with a target of reaching comparable performance to the p-type configuration. Surprisingly, it was found that the single component film electrode of PEDOT/PSS exhibited superior performance surpassing all the other studied carbon-based materials including PEDOT/PSS-EFG, PEDOT/ PSS-CNT, and PEDOT/PSS-EFG/CNT ( Figure S10a, Supporting Information).…”

Section: Electrode Optimization For P-and N-type Cellsmentioning

confidence: 99%

Advanced Wearable Thermocells for Body Heat Harvesting

Liu

Zhang

Zhou

et al. 2020

Advanced Energy Materials

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120

149

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Thermoelectrochemical cells (thermocells) designed for harvesting human body heat can provide constant power output for wearable electronics, supplementing state‐of‐the‐art flexible power storage and conversion solutions. However, a systematic investigation into the optimization of wearable thermocells is lacking, especially with regard to device design, n‐type electrolytes, and electrode/electrolyte integration. Here, a n‐type gel electrolyte: polyvinyl alcohol‐FeCl2/3 with outstanding flexibility and elasticity and exceptional electrolyte/electrode integration into a 3D porous poly(3,4‐ethylenedioxythiophene)/polystyrenesulfonate (PEDOT/PSS) electrode, is produced via an in situ chemical crosslinking method. The integrated n‐type cell shows excellent seebeck coefficients (0.85 mV K−1) and output current density (1.74 A m−2 K−1) that are comparable with an optimized p‐type cell consisting of a carboxymethylcellulose‐K3/4Fe(CN)6 electrolyte with a 3D PEDOT/PSS‐edge functionalized graphene/carbon nanotube electrode (−1.22 mV K−1 and 1.85 A m−2 K−1). The equivalent performance of the n‐type and p‐type cells enables the effective series connection of up to 18 pairs of p–n cells that combines to give an output voltage of 0.34 V (∆T = 10 K). This in‐series device is fabricated into a proof‐of‐concept watch strap, which can harvest body heat, charge supercapacitor (up to 470 mF) as well as illuminate a green light emitting diode, demonstrating the practical applications.

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Section: Electrode Optimization For P-and N-type Cellsmentioning

confidence: 99%

Advanced Wearable Thermocells for Body Heat Harvesting

Liu

Zhang

Zhou

et al. 2020

Advanced Energy Materials

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120

149

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“…However, the low conductivity factor (i.e., the ratio of electrical and thermal conductivity) of the electrolytes leads to poor thermoelectric performance. [ 5 ]…”

Section: Figurementioning

confidence: 99%

Redox Targeting‐Based Thermally Regenerative Electrochemical Cycle Flow Cell for Enhanced Low‐Grade Heat Harnessing

Zhang

et al. 2020

Advanced Materials

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A large amount of low‐grade heat (<100 °C) is produced in electrical devices and mostly wasted. This type of heat without effective dissipation also causes compromised device performance, reliability, and lifespan. To tackle these issues, a redox targeting (RT)‐based flow cell with judiciously designed thermoelectrically active redox materials is demonstrated for the first time for efficient heat‐to‐electricity conversion through a thermally regenerative electrochemical cycle (TREC). Compared with the conventional TREC systems, the RT‐based flow cell not only reveals considerably enhanced thermoelectric efficiency, but the flow of redox fluids also provides a cooling function to the system. In this work, solid material Ni0.2Co0.8(OH)2 and redox mediator [Fe(CN)6]4−/3−, both of which have negative temperature coefficient and share identical redox potential, are paired via RT‐reactions to boost the capacity and meanwhile thermoelectric efficiency of a [Fe(CN)6]4−/3−/Zn0/2+‐based flow cell. Upon operating over the TREC cycle, the RT‐based flow cell converts heat to electricity at an unprecedented absolute thermoelectric efficiency of 3.61% in the temperature range of 25–55 °C.

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“…TENGs is feasible for driving various electronic devices, ranging from light-emitting diodes (LEDs) (Yang et al, 2013d ; Lin et al, 2014 ; Chun et al, 2015 ; Kanik et al, 2015 ; Mao et al, 2015 ; Wu et al, 2016 ) to cell phones (Wang et al, 2012 ; Zhu et al, 2014c ) and from a large number of bio-sensors (Fan et al, 2015 ; Wen et al, 2015 ; Cai et al, 2018 ; Su et al, 2018 , 2020a , b ; Davoodi et al, 2020 ; Meng et al, 2020 ) to pacemakers (Zheng Q. et al, 2014 ). This shows showing their remarkable compatibility with a wide range of application in different settings, displaying that plentiful possibilities are remaining to be further explored (Wang, 2014 ; Hinchet et al, 2015 ; Wang S. et al, 2015 ; Zhang et al, 2015 ; Zhu et al, 2015 ; Zhang B. et al, 2016 ; Pu et al, 2020b ).…”

Section: Introductionmentioning

confidence: 99%

Leverage Surface Chemistry for High-Performance Triboelectric Nanogenerators

Zou

Nashalian

2020

Front. Chem.

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Triboelectric Nanogenerators (TENGs) are a highly efficient approach for mechanical-to-electrical energy conversion based on the coupling effects of contact electrification and electrostatic induction. TENGs have been intensively applied as both sustainable power sources and self-powered active sensors with a collection of compelling features, including lightweight, low cost, flexible structures, extensive material selections, and high performances at low operating frequencies. The output performance of TENGs is largely determined by the surface triboelectric charges density. Thus, manipulating the surface chemical properties via appropriate modification methods is one of the most fundamental strategies to improve the output performances of TENGs. This article systematically reviews the recently reported chemical modification methods for building up high-performance TENGs from four aspects: functional groups modification, ion implantation and decoration, dielectric property engineering, and functional sublayers insertion. This review will highlight the contribution of surface chemistry to the field of triboelectric nanogenerators by assessing the problems that are in desperate need of solving and discussing the field's future directions.

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Thermogalvanic Hydrogel for Synchronous Evaporative Cooling and Low-Grade Heat Energy Harvesting

Cited by 192 publications

References 31 publications

Advanced Wearable Thermocells for Body Heat Harvesting

Advanced Wearable Thermocells for Body Heat Harvesting

Redox Targeting‐Based Thermally Regenerative Electrochemical Cycle Flow Cell for Enhanced Low‐Grade Heat Harnessing

Leverage Surface Chemistry for High-Performance Triboelectric Nanogenerators

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