Ion regulation in double-network hydrogel module with ultrahigh thermopower for low-grade heat harvesting

Liu，Chang1,2; Li，Qikai1,3; Wang，Sijia1; Liu，Weishu3; Fang，Nicholas X.2; Feng，Shien Ping1

2022-02-01

10.1016/j.nanoen.2021.106738

Nano Energy   影响因子和分区

2211-2855

2211-3282

Harvesting low-grade heat as source of electrical power has emerged as a research frontier for self-powered wearable devices, as a promising route to overcome challenges associated with limited access to grid power. However, such promise is compromised by current attainable thermopowers and constraints of rigid or complicated thermoelectric systems. We report an ultrahigh thermopower of 19.32 mV K on a stretchable thermoelectric module by the assembly of porous electrodes and hybrid hydrogel, containing 1-ethyl-3-methylimidazolium and tetrafluoroborate ions and polyethylene glycol. The anions act as charge carrier; for the first time, distinct ion mobilities are directly measured by 2D-diffusion-ordered nuclear magnetic resonance spectroscopy. By regulating ion transport via the synergy of selective ion-localization and thermo-osmotic mechanism, such design provides an effective strategy to increase thermopower, and our device is endowed with high output power density, tailorable architecture, and excellent stretchability, which is showcased in a thermoelectric wristband for body heat recovery.

2D-diffusion-ordered spectroscopy double-network hydrogel ion transport ionic thermoelectric systems low-grade heat harvesting thermopower

SCI ; EI

英语

其他

General Research Fund of the Research Grants Council of Hong Kong Special Administrative Region, China[17206519,17206518]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000722125500002

ELSEVIER

20214611179709

Electrodes ; Hydrogels ; Ions ; Nuclear magnetic resonance spectroscopy ; Thermoelectric power ; Waste heat

Energy Losses (industrial and residential):525.4 ; Colloid Chemistry:801.3 ; Chemical Products Generally:804 ; Agricultural Methods:821.3

2-s2.0-85119074604

Scopus

1.Department of Mechanical Engineering,The University of Hong Kong,Pokfulam Road,999077,Hong Kong
2.Department of Mechanical Engineering,Massachusetts Institute of Technology,Cambridge,02139,United States
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Liu，Chang,Li，Qikai,Wang，Sijia,et al. Ion regulation in double-network hydrogel module with ultrahigh thermopower for low-grade heat harvesting[J]. Nano Energy,2022,92.

Liu，Chang,Li，Qikai,Wang，Sijia,Liu，Weishu,Fang，Nicholas X.,&Feng，Shien Ping.(2022).Ion regulation in double-network hydrogel module with ultrahigh thermopower for low-grade heat harvesting.Nano Energy,92.

Liu，Chang,et al."Ion regulation in double-network hydrogel module with ultrahigh thermopower for low-grade heat harvesting".Nano Energy 92(2022).