Micromachines
·
2023
·Vol. 14
·期 7
·1327
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IF 3.4
Kun Yang,Chenhui Bai,Boyuan Liu,Zhoutong Liu,Xiaojing Cui
Thermogalvanic hydrogel, an environmentally friendly power source, enable the conversion of low-grade thermal energy to electrical energy and powers microelectronic devices in a variety of scenarios without the need for additional batteries. Its toxicity, mechanical fragility and low output performance are a hindrance to its wide application. Here, we demonstrate thermoelectric gels with safe non-toxic, recyclable, highly transparent and flexible stretchable properties by introducing gelatin as a polymer network and SO3/42−as a redox electric pair. When the temperature difference is 10 K, the gel-based thermogalvanic cell achieves an open-circuit voltage of about 16.2 mV with a maximum short-circuit current of 39μA. Furthermore, we extended the application of the Gel-SO3/42−gel to monitor the temperature of hot or cold food, enabling self-powered sensing for food temperature detection. This research provides a novel concept for harvesting low-grade thermal energy and achieving safe and harmless self-driven temperature monitoring.Keywords:hydrogel;thermogalvanic;gelatin;self-powered
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 23
·4238
·
IF 5.719
Wenhang Wu,Zheng Liang,Meng Jia,Yuwei Li,Xiongcong Guan,Yunfeng Zhan,Jinxiu Wen,Jianyi Luo
A flexible thermoelectric device has been considered as a competitive candidate for powering wearable electronics. Here, we fabricated an n-type Ag2Se/Ag composite film on a flexible nylon substrate using vacuum-assisted filtration and a combination of cold and hot pressing. By optimising the Ag/Se ratio and the sequential addition and reaction time of AA, an excellent power factor of 2277.3 μW∙m−1K−2(corresponding to aZTof ~0.71) at room temperature was achieved. In addition, the Ag2Se/Ag composite film exhibits remarkable flexibility, with only 4% loss and 10% loss in electrical conductivity after being bent around a rod of 4 mm radius for 1000 cycles and 2000 cycles, respectively. A seven-leg flexible thermoelectric device assembled with the optimised film demonstrates a voltage of 19 mV and a maximum power output of 3.48 μW (corresponding power density of 35.5 W m−2) at a temperature difference of 30 K. This study provides a potential path to design improved flexible TE devices.Keywords:thermoelectricity;Ag2Se;Ag;composite film;flexible device
研究领域:
材料科学
·
能源技术
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产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2017
·
IF 12.343
Nan Ma,Ya Yang
ABSTRCT Ferroelectric material BaTiO 3 (BTO) with intrinsic spontaneous polarization demonstrates excellent pyroelectric effect that output current/voltage signals can be observed even by slight temperature fluctuation. Here, we report a self-powered 365 nm UV light photodetector by using the light-induced pyroelectric effect in Ag/BTO/Ag device with the response time of about 0.5 s at the rising edge. Moreover, the heating-induced pyroelectric effect has been utilized to enhance the 365 nm light response, where both the corresponding photoconductive gain and responsivity can be dramatically enhanced by larger than 1200% under a temperature variation rate of 2.1 K/s as compared with that of UV light illumination. Our study proposes a feasible method to enhance the 365 nm light response by coupling light and heating-induced pyroelectric effect in BTO, which has potential applications in thermal energy scavenging and self-powered sensor systems .
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yukai Chen,Ruizhe Wang,Ling Zhou,Rulin Dong,Jiahui Kou,Chunhua Lu
Hindering the recombination of photoinduced electron-hole pairs is of significance for enhancing photocatalytic performance. Applying a voltage to separate carriers offers an option to realize it. Thermoelectric materials own the ability to continuously sustain a voltage when a temperature difference exists between its two sides. However, maintaining the thermoelectric effect without wasting additional energy remains a challenge. Herein, a C 3 N 4 /Polyaniline/Poly(vinylidene fluoride) cilia array was fabricated to reach efficient photocatalysis through thermoelectric effect and photothermal effect. The cilia array structure offers more than 40% of light absorbance compared to the film. Hence, the infrared light in sunlight, which was usually omitted in photocatalysis, was transformed into heat. Through the unique design which draws upon the huge difference in thermal conductivity of air and water, a temperature gap was formed between the top and bottom sides of the cilia array by half-submerging it in water. Therefore, the photocatalytic efficiency was improved by 84.4%. This work achieves an energy-saving method to enhance photocatalytic performance by activating thermoelectric effect through infrared light, shedding light on the application of multi-modes enhanced photocatalysis.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Qingtao Zeng,Binglin Wang,Xuejun Lai,Hongqiang Li,Zhonghua Chen,Huali Xie,Xingrong Zeng
Titanium carbide (MXene) nanosheet is one of the most promising early fire-warning materials but limited by its relatively low thermopower. Doping modification is an effective method to improve its thermoelectric efficiency. Herein, a novel enhanced thermopower flame-retardant cotton fabric (HTE@CF) was fabricated by dip-coating of MXene, tannic acid (TA), and calcium chloride (CaCl 2 ) via layer-by-layer assembly. It was found that HTE@CF exhibited high thermopower. When the temperature difference was 120 °C, its maximum thermoelectric voltage was as high as 3.72 mV, and the Seebeck coefficient was more than 39.4 μV/K, which was about 900% higher than those of MXene/TA@CF. HTE@CF displayed accurate temperature response and sensitive fire-warning performance. When being burned, it quickly triggered the fire-warning system within 3 s. More importantly, HTE@CF exhibited outstanding flame retardancy. Its limiting oxygen index (LOI) was as high as 35.3%, and its structure remained stable when exposed to the flame for 60 s. Furthermore, due to the high conductivity of MXene and CaCl 2 , HTE@CF showed good piezoresistive sensing capability. Our work provides new insights for the preparation of multifunctional and smart fire protection cotton fabrics.
研究领域:
材料科学
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智能纺织品
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火灾安全工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shouze Li,Zhou Li,Dongyan Xu,Run Hu
Emerging thermocells exhibit a significant potential in low-grade heat harvesting owe to their high mV-scale thermopower, low cost, and high robustness. Fundamentally, three effects contribute to the thermopower enhancement of liquid thermocells, i.e. original concentration effect, solvation effect, and normalized concentration gradient effect. Yet, the contribution of the solvation effects and the normalized concentration gradient in organic solvents remains a subject of debate. In this paper, we integrate experiments, spectral analysis, and electrochemical theory to demonstrate that the normalized concentration gradient dominates the enhancement of thermopower in the investigated organic solvents, whereas the solvation effect is weak. Further, the introduction of ethanol results in a thermosensitive solubility of K 4 Fe(CN) 6 and a minimal concentration at the cold end, which establishes a huge substantial normalized Fe(CN) 6 4- concentration gradient and increases the Seebeck coefficient to 3.4 mV/K. Simultaneously, the precipitation resulting from the introduction of an organic solvent notably diminishes the heat convection within the system. As a result, the optimized TC-35EtOH system yields a ZT value (0.094) and Carnot-relative efficiency (2.52 %) that are 7 times greater than those of its initial counterpart. Additionally, the system’s high power density of 3.64 W/m 2 suggests its potential for harnessing low-grade heat waste energy.
研究领域:
物理化学
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能源材料科学
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DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 16
·6109-6117
·
IF 8.307
Junyu Li,Yousheng Zou,Dawei Hu,Yu Gu,Zeyao Han,Jiaxin Liu,Xiaobao Xu
Terahertz (THz) detection technology is getting increasing attention from scientists and industries alike due to its superiority in imaging, communication, and defense. Unfortunately, the detection of THz electromagnetic waves under room temperature requires a complicated device architecture design or additional cryogenic cooling units, which increase the cost and complexity of devices, subsequently imposing an impediment in its universal application. In this work, THz detectors operated under room temperature are designed based on the thermoelectric effect with MAPbI3 single crystals (SCs) as active layers. With solution-processed molecular growth engineering, the anti-reflection 2D perovskite layers were constructed on SCs’ surfaces to suppress THz reflection loss. Simultaneously, by finely regulating the main carrier types and the direction of the applied bias across the inclined energy level, the thermoelectric effect is further promoted. As a result, THz-induced ΔT in MAPbI3 SCs reaches 4.6 °C, while the enhancement in the bolometric and photothermoelectric effects reach ∼4.8 times and ∼16.9 times, respectively. Finally, the devices achieve responsivity of 88.8 μA W−1 at 0.1 THz under 60 V cm−1, noise equivalent power (NEP) less than 2.16 × 10−9 W Hz−1/2, and specific detectivity (D*) of 1.5 × 108 Jones, which even surpasses the performance of state-of-the-art graphene-based room-temperature THz thermoelectric devices. More importantly, proof-of-concept imaging gives direct evidence of perovskite-based THz sensing in practical applications.
研究领域:
材料科学
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电磁波检测
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纳米技术
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半导体物理
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Meng Shen,Zhaoyao Hu,Yaqin Qiu,Shiyong Qiu,Ming-yu Li,Guangzu Zhang,Shujun Zhang,Zhengbao Yang,Fumitaka Kagawa,Shenglin Jiang
The pyroelectric effect provides an efficient route to convert low-grade waste heat into electricity. (Bi 0.5 Na 0.5 )TiO 3 -based ceramic is one of the most attractive lead-free pyroelectric candidates due to its high polarization. However, the low breakdown strength (BDS) restricts its ability to achieve a high polarization, hindering the application for thermal energy harvesting based on the Olsen cycle. In this work, by incorporation of AlN into BNT-BZT ceramics to form the BNT-BZT: AlN composites, the BDS is enhanced from 160 kV cm −1 to 260 kV cm −1 , leading to a high energy density of 1.54 J cm −3 which is ∼5 times that of the pristine BNT-BZT. The reason for the high energy harvesting performance is due to the addition of AlN that can depress the conductivity of the matrix, resulting in the high BDS that permits high electric fields to be applied on the samples to induce high polarization that changes pronouncedly with temperature.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Kai Yan,Jun Wang,Yan Zong,Qunna Xu,Fei Xu,Tongtong Wang
Fabric-based wearable devices have gained significant attention as next-generation flexible electronics. However, traditional fabric sensors are limited by their dense woven structures, which hinder moisture-wicking and self-powered applications. There is an urgent need to develop more portable fabric sensors that combine efficient moisture-wicking with versatile sensing capabilities. In this work, a Janus-structured fabric sensor integrating moisture-wicking (unidirectional wetting) characteristics, superior ionic thermoelectric (i-TE) properties and strain sensing capabilities was developed. The Janus fabric sensor was fabricated through a two-step sequential modification process. First, a layer of conductive polypyrrole (PPy) was synthesized directly on the fabric surface through in situ polymerization. Second, asymmetric surface modification was achieved: an i-TE gel was spray-coated onto one side of the fabric, while 3-(trimethoxysilyl)propyl methacrylate and poly(ethylene glycol) methacrylate were applied to the opposite side to create a hydrophilic surface. The i-TE gel was prepared by incorporating 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide into fluorine-modified polyurethane. The Janus fabric sensor, with its asymmetric architecture, achieved effective moisture-wicking and liquid transport against gravity within 2 s. It exhibited sensitive motion-sensing performance with a gauge factor of 9.37 while simultaneously showing outstanding thermoelectric properties, characterized by a Seebeck coefficient of 4.84 mV K−1 and a power factor of 32.8 μW mK−2. These attributes enabled the monitoring of different human activity stages in a wearable self-powered mode. More significantly, the sensor's rapid response time of 0.2 s to flame exposure enabled common household textiles to serve as fire-warning systems. It holds a great promise as a platform for next-generation smart textiles.
研究领域:
材料科学
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可穿戴设备
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智能纺织品
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产品关联
DOI
高影响因子
Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-13
·
IF 36.3
Du Chunyu,Hu Yue,Xiao Xiao,Manshaii Farid,Liang Lirong,Chen Jun,Chen Guangming
A novel photobase generator is specifically designed for the fabrication of high-resolution sensing devices.
Similarities in pain perception mechanism between thermoelectric-based artificial thermoreceptor and biological nociceptor.
Emulation common nociceptive behaviors and pain response under excessive temperature stimuli.
研究领域:
生物医学工程
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材料科学
·
神经生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Thermal Science
·
2023
·Vol. 33
·期 1
·383-393
·
IF 2.5
Dai Zhaofeng,She Xiaohui,Shao Bohan,Yin Ershuai,Ding Yulong,Li Yongliang,Zhang Xiaosong,Zhao Dongliang
Plastic crystal neopentyl glycol (NPG) exhibits colossal barocaloric effect with high entropy changes. However, their application is restricted in several aspects, such as low thermal conductivity, substantial supercooling effect, and poor springback properties. In this work, multi-walled carbon nanotubes (MWCNTs) with ultra-high thermal conductivity and high mechanical strength were selected for performance enhancement of NPG. The optimal mixing ratio was determined to be NPG with 3 wt% MWCNTs composites, which showed a 6 K reduction in supercooling without affecting the phase change enthalpy. Subsequently, comprehensive performance of the composites with optimal mixing ratio was compared with pure NPG. At 40 MPa, 390 J·K −1 ·kg −1 change in entropy and 9.9 K change in temperature were observed. Furthermore, the minimum driving pressure required to achieve reversible barocaloric effect was reduced by 19.2%. In addition, the thermal conductivity of the composite was increased by approximately 28%, significantly reducing the heat exchange time during a barocaloric refrigeration cycle. More importantly, ultra-high pressure release rate resulted in a 73.7% reduction in the springback time of the composites, offering new opportunities for the recovery of expansion work.
研究领域:
材料科学
·
热力学
·
能源工程
✓ 已验证
DOI
高影响因子
Science Advances
·
2020
·Vol. 6
·期 38
·
IF 13.117
Wei Li,Xin Tang,Liqiu Wang
Precision manipulation of various liquids is essential in many fields. Unlike solid objects, fluids are intrinsically divisible, enriching their fundamental operations with merging, dispensing, and splitting on top of moving. Fluids are sticky as well, calling for their lossless manipulation to prevent mass loss and contamination. We present photopyroelectric microfluidics that meet all the requirements. In response to the irradiation from even one single beam of light, our platform creates a unique wavy dielectrophoretic force field that is remarkably capable of performing desired loss-free (loss being 0.5% of existing one) manipulation of droplets of surface tension from 18.9 to 98.0 mN m−1 and volume from 1 nl to 1000 μl, functioning as a “magic” wetting-proof hand to navigate, fuse, pinch, and cleave fluids on demand, enabling cargo carriers with droplet wheels and upgrading the limit of maximum concentration of deliverable protein by 4000-fold.
研究领域:
生物工程
·
微纳米技术
·
光学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）