JOURNAL OF COLLOID AND INTERFACE SCIENCE
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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
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Jie Yu,Yuwei Wang,Cong Qi,Wenjie Zhang
Nanoparticles and metal foam are doped with the phase change materials (PCMs) to improve the utilization efficiency of solar energy during the day. In order to investigate the latent heat power generation properties of this hybrid PCM at night, A photothermal conversion experimental platform was built in this paper, the effects of metal foam pore density (PPI=0, 5, 10, 15) and nanoparticle concentrations ( ω = 0%, 0.5%, 0.8%, 1.0%) on the reverse temperature difference properties were investigated. Results indicates that PPI= 15 metal foam and ω = 1.0% nanoparticles can reduce the internal temperature of hybrid PCM by 35.92% and 20.93% respectively compared with pure paraffin. PPI= 15, 10, and 5 metal foam decreases the temperature difference, voltage, and power generation at most by 74.57%, 71.02%, and 74.54% compared with PPI= 0. Compared with ω = 0% nanoparticles, the temperature drop rates of ω = 1.0%, 0.8%, and 0.5% nanoparticles increase at most by 103.0%, 79.69% and 39.84% respectively. To a certain extent nanoparticles and metal foam are not conducive to reverse latent heat power generation although they are beneficial to photothermal performance. This research has reference and guiding significance for reverse latent heat power generation properties of PCMs doped with nanoparticles and metal foam at night.
研究领域:
能源科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2024
·
IF 8.4
Xusheng Liu,Keli Wang,Peng Li,Qiqi Tang,Zhenlong Huang,Yuan Lin,Wu Wang,Binbin Jiang,Jiaqing He
Entropy engineering has emerged as an effective strategy for improving the figure-of-merit zT by decelerating the phonon transport while maintaining good electrical transport properties of thermoelectric materials. Herein, a high average zT of 1.54 and a maximum zT of 2.1 are achieved in the mid-entropy GeTe constructed by Ag, Sb, and Pb alloying. At room temperature, the mid-entropy GeTe tends to be a cubic structure. And the power factor is improved from 7.7 μW·cm −1 ·K −2 to 16.2 μW·cm −1 ·K −2 due to the large increase in effective mass and the optimized carrier concentration. The increasing disorder created by heavy and off-centering Ag, Sb, and Pb atoms induces strong mass/strain fluctuations and phonon scattering to decelerate the phonon transport in GeTe. A low lattice thermal conductivity is obtained in the medium-entropy GeTe-based material. Moreover, a GeTe-based thermoelectric cooler is fabricated with the cooling temperature difference of 66.6 K with the hot end fixed at 363 K. This work reveals the effectiveness of entropy engineering in improving the average zT in GeTe and shows potential application of GeTe as a thermoelectric cooler.
研究领域:
材料科学
·
热电材料研究
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Guoxiang Xie,Yifan Li,Changheng Wu,Mengran Cao,Hongkai Chen,Yujie Xiong,Yang Xu,Huaqing Xie,Wei Yu
Thermochromic smart windows have the capability to intelligently adjust color and light transmission based on ambient temperature and light levels, attracting considerable attention due to their potential to enhance building energy efficiency and residential comfort. However, excessive sunlight exposure can lead to increased heat generation, potentially affecting the service life of the window. In this work, we present the development of an efficient intelligent solar thermal utilization window, incorporating heat collection, temperature regulation, and power generation functionalities. The smart window achieves light modulation by adjusting the glycerol content in the thermochromic hydrogel. In addition, the thermoelectric material is arranged in series and parallel to the smart window functioning as the power generation module. The developed smart window shows excellent sunlight modulation capability (91.2 % visible light transmittance and 99.2 % sunlight shielding rate). Meanwhile, the response temperature of the window can be adjusted from 34.5 °C to 29 °C. The thermoelectric hydrogel can generate continuous and stable current (∼75 µA) with a temperature difference of 40 ℃. The practical application proves that the generated power by the temperature difference can fully meet the switching needs of small electrical appliances. This transformation framework between photothermal-electricity conversion deserves attention in the design of future smart windows.
研究领域:
材料科学
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能源技术
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建筑节能
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-19
·
IF 14.7
Poredoš Primož,Gao Jintong,Shan He,Yu Jie,Shao Zhao,Xu Zhenyuan,Wang Ruzhu
Passive solar membrane distillation (MD) is an emerging technology to alleviate water scarcity. Recently, its performance has been enhanced by multistage design, though the gains are marginal due to constrained temperature and vapor pressure gradients across the device. This makes condenser cooling enhancement a questionable choice. We argue that condenser heating could suppress the marginal effect of multistage solar MD by unlocking the moisture transport limit in all distillation stages. Here, we propose a stage temperature boosting (STB) concept that directs low-temperature heat to the condensers in the last stages, enhancing moisture transport across all stages. Through STB in the last two stages with a heat flux of 250 W m −2 , a stage-averaged distillation flux of 1.13 L m −2 h −1 S −1 was demonstrated using an 8-stage MD device under one-sun illumination. This represents an 88% enhancement over the state-of-the-art 10-stage solar MD devices. More notably, our analysis indicates that 16-stage STB-MD devices driven by solar energy and waste heat can effectively compete with existing photovoltaic reverse osmosis (PV-RO) systems, potentially elevating freshwater production with low-temperature heat sources.
研究领域:
能源工程
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环境科学
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水资源管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Bing Sun,Mengyuan Wu,Xuguang Zhao,Lingfeng Wang,Yuandong Jia,Zhijie Yuan,Haojie Wu,Jibo Diao,Gaohong He,Xiaobin Jiang
Low-temperature differential evaporation constitutes a promising direction for energy-saving desalination. Herein, a novel Janus interfacial structure with well-ordered micro/nanopores is developed. Fabricated Janus interfacial structure can weak the water intermolecular forces and pump water to the hydrophilic–hydrophobic junction. Within well-ordered nanochannels, the increased curvature of the meniscus increases the ratio of thin water layers, thereby enhancing microscale heat transfer at the heated walls; in addition, the smaller nanopores limit the development of microscale vortices at the liquid–gas interface and prevent back mixing of intermediate water at the interface, which possess the nanoscale effect on intensifying the interfacial evaporation. These effects are validated by theoretical and experimental studies. Optimized Janus (20 nm) 95°/25° structure exhibits evaporation fluxes up to 2.4 kg m −2 h −1 at 45 °C (feed side)/25 °C (permeate side, ambient pressure), as the theoretical evaporation enthalpy is only 30% of that for direct evaporation. The unique Janus structure simultaneously inhibits salt accumulation and achieve self-cleaning, thereby maintaining steady performance during 480 h of continuous desalination and 50 cycles of batch operation. This work highlights a promising structural design strategy for separation materials with specific micro/nanoscopic topologies to achieve high performance thermally driven desalination applications.
研究领域:
材料科学
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热能工程
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Xiaodong Wang,Lirong Liang,Haicai Lv,Yichuan Zhang,Guangming Chen
Despite the rapid development for thermoelectrics (TEs) and aerogels , elastic aerogel TE generators (TEGs) with vertical-type architectures have not been found to harvest heat utilizing vertical temperature difference. Herein, an elastic poly(3,4-ethylenedioxytiophene)-tosylate(PEDOT-Tos)/single-walled carbon nanotube (SWCNT) TE aerogel was fabricated via convenient chemical oxidative polymerization, physical mixing and subsequent freeze-drying process. Then, we report the first elastic TEGs consisting of vertical-type aerogel legs, which not only inherit the advantages of ultralight weight and compressibility of aerogels, but also display high TE performance. The output performance can be conveniently adjusted by the number of legs, the temperature difference and compressive strain . An optimum output power of 1967 nW (output power density of 30.73 mW m −2 ) is achieved for the TE generator using 10 unipolar aerogel legs at 50% strain and temperature difference of 50 K. Furthermore, the ultralight and compressible TEG displays excellent capability of harvesting heat under vertical temperature difference and mechanical deformation , such as on hot oil/plate or compression by human body. The results will greatly facilitate the development of TE aerogels and TEGs, and widen the versatile application scenarios.
研究领域:
材料科学
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热电学
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纳米技术
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能量收集
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Tingting Meng,Yimin Xuan,Xiaogang Zhang
Electrical charging and discharging supercapacitors are well-known and invoke plenty of studies. There exist few publications on thermal-driven electrochemical reactions and storing devices, although such devices are in urgent need for efficiently utilizing waste heat and solar heat. In this work, we propose an innovative method of coupling electric double layer and ion intercalation approaches for developing a thermally chargeable hybrid supercapacitor (TCHS) with a high output power density, which can simultaneously convert heat from different available sources directly to electricity and store it in situ. The working principle of a TCHS is fully different from that of an electrically chargeable supercapacitor. We experimentally verify the feasibility of a TCHS. In the case that the developed device operates under a temperature difference of 50 °C, for example, it can generate a temperature coefficient of up to 12.1 mV K–1 and a maximum output power density of 20.4 W m–2, which is the highest level for a thermally chargeable supercapacitor at the moment. Such a device can realize the electric energy storage at the same time and overcome the instability and intermittent restriction of heat energy supply.
研究领域:
能源材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 9
·3771-3776
·
IF 3.288
Zhigang Peng,Chen Chen,Qian Feng,Yong Zheng,Huan Liu,Chunyang Yu
Because of the contradiction between the safe thickening time of cement slurry and over-retarding at the top in the cementing of a long sealing section with large temperature difference, we synthesized a quaternary copolymerization retarder with 2-acrylamide-2-methyl propane sulfonic acid (AMPS), acrylic acid (AA), diallyl dimethyl ammonium chloride (DMDAAC) and allyl polyoxyethylene ether (APEG). The structure of the retarder was characterized by FTIR and 1H NMR and its thermal stability was tested by TG-DSC. The results showed that the molecule contained the designed functional groups, the initial pyrolysis temperature was 364 °C, and its performance was stable in the temperature range of 90–150 °C. There was no “bulge” or “step” on the thickening curve, and the thickening time could meet the safety requirements of pumping at high temperatures. It can also ensure the development of compressive strength of cement in the low-temperature section and has excellent temperature adaptability. Through the study of its retardation mechanism, it was found that the retarder molecules formed an adsorption layer of a certain thickness on the surface of cement particles by adsorption, and the concentration of Ca2+ in the solution was reduced by complexation, so as to prevent cement hydration and prolong the thickening time. Generally speaking, the large temperature difference adaptability of retarders was mainly manifested in the decrease of molecular adsorption capacity and performance at low-temperature and the improvement of molecular adsorption capacity and performance at high-temperature.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Jianing Li,Zhaosu Wang,Saeed Ahmed Khan,Ning Li,Zhiquan Huang,Hulin Zhang
In recent years, an increase in the use of wearable electronics has been observed in daily life due to the rapid development of personal medical health systems and the Internet of Things . Environment-friendly quasi-solid-state thermogalvanic hydrogels are enabled to convert low-grade heat into electricity and expected to be used for signal conversion in smart medical applications. However, existing wearable models in nursing are not entirely applicable for aphasic patients. Herein, we introduced a thermogalvanic interpenetrating network hydrogel (TG-IPNH) with [Fe(CN) 6 ] 3- /[Fe(CN) 6 ] 4- as a redox pair and KCl as a ion provider for thermodiffusion , which not only has good flexibility but also prominent thermoelectric property with the thermal current up to 124 μA at the temperature difference of 10 K. Relying on the gel’s sensitive correlative thermoelectric response to temperature triggered by a finger and in combination with Morse Code , a self-powered gel wristband for information conversion has been developed to provide real-time help and assistance to aphasic patients. This gel-based wristband device can be potentially applied as a supplementary interaction route for them who have language impairment, especially in intelligent healthcare and emergency rescue.
研究领域:
材料科学
·
生物医学工程
·
智能医疗
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Luomeng Chao,Changwei Sun,Lihua Peng,Jiaxin Li,Miao Sun,Lihong Bao,Jia Liu,Yonghong Ma
Transparent heat-shielding (THS) glass based on selective absorbing materials has great application prospects in reducing building energy consumption. However, the heat generated by absorbing near-infrared light will also increase the indoor temperature, meanwhile, a single energy-saving material often causes obvious indoor temperature differences. This paper presents an energy-saving building room based on Cs x WO 3 @TiO 2 coated glass (CG) and polyethylene glycol (PEG)/halloysite nanotubes (HNTs) energy storage cement (CP/F). The Cs x WO 3 (CWO) nanoparticles coating with TiO 2 enhanced the stability of THS materials. The PEG/HNTs energy storage material exhibits a desirable phase change temperature of 28.70 °C, and relatively high latent heat of 74.84 J/g. The test room result shows that the combination of CG and CP/F can reduce the room temperature by about 10 °C, which is greater than the sum of CG and CP working alone owing to the synergistic effect of two materials, that is, CP/F can absorb part of the heat from CG. The combination of CG and CP/F made the indoor temperature distribution more uniform, with the maximum temperature difference decreasing from 6.7 °C to 3.1 °C. The annual energy saving of CP/F-CG in Changsha and Hong Kong is 14.7 % and 23.4 % respectively, and the economic payback period is 6.57 and 4.82 years respectively. The experimental results provide a new perspective on the development of energy-saving buildings.
研究领域:
建筑材料
·
能源工程
·
建筑环境与设备工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ling Liu,Jia Fu,Xueyan Hu,Dengsen Yuan,Jin Wang,Qingwen Li
A large number of areas on earth is suffered from large-temperature fluctuation (LTF) during the days or over the seasons. However, current strategies for adaptive thermal management in the LTF environment are limited. In this study, we developed a simple and cost-effective strategy to synthesize ultrafine and nearly monodispersed silica aerogel microspheres (SAM) with an average diameter of 1.9 μm. The aerogels possess low thermal conductivity of 0.039 W·m −1 ·K −1 and can preserve heat by reducing heat dissipation in cold environments. Meanwhile, IR emissivities range from 0.13 to 0.98 and a relatively high solar reflectance of 0.65, leading to an impressive sub-ambient cooling of 9.1 °C in a hot daytime. Additionally, a theoretical carbon emission analysis of the aerogels' daytime cooling and night warming suggests a carbon emission reduction of 13.6 tCO 2 eq. This study develops a strategy to synthesize ultrafine SAM and provides a strategy for passive cooling and passive warming by SAM with the combination of passive cooling and thermal insulation, which could help to achieve global carbon neutrality and sustainability, and solve the problems of thermal management with large temperature-fluctuation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）