SOLAR ENERGY
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2020
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IF 4.608
Yongyichuan Zhang,Xuelai Zhang
PV-PCM technology can not only achieve higher photoelectric conversion efficiency, but also has the advantages of energy saving, high efficiency, and economical applicability. In this paper, a new type of CaCl 2 ·6H 2 O-MgCl 2 ·6H 2 O composite PCM for PV-PCM was prepared by physical blending method using calcium chloride hexahydrate-magnesium chloride eutectic mixture as PCM and expanded graphite as carrier. The shape stability, thermal properties and thermal reliability of CaCl 2 ·6H 2 O-MgCl 2 ·6H 2 O eutectic materials under EG conditions were discussed. The change of temperature and output power of PV panel combined with PV-PCM was studied. The experimental results show that the CaCl 2 ·6H 2 O-MgCl 2 ·6H 2 O composite with 8 %EG has high phase change enthalpy (171.4 kJ/kg), suitable phase change temperature (27.1 °C), and negligible supercooling degree (0.11 °C) and excellent thermal conductivity (3.359 W/m·K). After 100 heating–cooling cycles, the modified composite phase change material still has excellent thermal reliability. Surface temperature of photovoltaic panels can be significantly reduced, and the average temperature of photovoltaic panels can be kept below 40 °C. The photovoltaic panel power can work for a long time (3.5–4 h) close to the rated power, keeping the photovoltaic panel power at a high and stable state, and producing 7.9% more power than using only photovoltaic panels to generate electricity.
研究领域:
能源材料
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光伏技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wenjing Miao,Ruixing Quan,Jiaxin Ju,Meng Hu,Hui Cao,Qian Xu,Yaxuan Xiong,Yanqi Zhao,Yulong Ding,Xiang Ling
Battery, as the core of the electric vehicle, needs to be thermally managed and protected to avoid decreased performance and thermal runaway. In this study, calcium chloride hexahydrate based composite phase change materials are developed for passive battery thermal management and thermal protection. The composite phase change materials achieve wide-temperature range thermal management based on their high energy density, including 84.89 ∼ 195.5 J/g for pre-heating between 0 and 10 ℃, 99.93 ∼ 179.2 J/g for operation cooling between 25 and 50 ℃, and 326 ∼ 699.5 J/g for thermal runaway elimination between 50 and 120 ℃. Using ceramic fibre as a support material, strontium chloride hexahydrate as a nucleating agent, and hydroxylated cellulose nanofiber to improve the form stability of calcium chloride hexahydrate, the phase transition temperature is increased to 37.1 °C, which meets thermal management requirements. The unique dendrite structure provided by crystalline phase change material and the cross-linked fibre network enhances the tensile strength of the composite to 2.97 MPa. Compared with typical battery wrapping material, Polyvinyl chloride, the battery module based on the developed composite phase change material can reduce the peak temperature and temperature difference during operation cooling by up to 34.9 % and 50.7 %, respectively. In addition, the composite phase change material also provides excellent flame retardancy, with a limiting oxygen index value of 100 % unburned and UL-94 grade reaching V0. In the case of battery thermal runaway, the composite phase change material can absorb the 37,730 J of energy released by the first battery and eliminate the thermal runaway. The results show that the prepared composite phase change material has high performance thermal management and thermal protection, with the advantage of low cost.
研究领域:
材料科学
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能源工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Longlong Zeng,Xiaoyan Li,Yinjie Chen,Haiping Yu,Zaisheng Cai
Anti-fogging is crucial to applications in harsh cold environment, for which ensuring the clear sight for people and the accuracy of certain precise instruments. Although there have been some studies on frost-resistant coatings in recent years, the duration of their anti-fogging under frost conditions is not long, and the complexity of the preparation process also makes it difficult to put them into practical use. In this paper, anti-fog coatings with good anti-fog and durability properties are prepared in a one-step process using hydroxy propyl methyl cellulose (HPMC), hydroxy ethyl cellulose (HEC), and anhydrous ferric chloride (FeCl 3 ) as materials. The raw materials of the coating and the preparation process are green and environmentally friendly. The light transmittance of the coated glass can exceed 90 % under the harsh fogging environment. The hydrogen-bond effects impart the anti-fogging coating durability for continuous anti-fogging under harsh environments, such as 3000 cycles fabric abrasion and one-year-long term frosting at −20 °C. The presented anti-fogging strategy can be used in daily scenarios and have great application prospects in severe cold environments.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Miao Zuo,Xiaoyu Zheng,Wenrong Che,Kang Wang,Yirou Chen,Xianhai Zeng
The efficacy of green and economical water-choline chloride (ChCl) co-solvent for the production of 5-hydroxymethylfurfural (HMF) from glucose and fructose, using different ion exchange resins as catalysts, was demonstrated under mild conditions in a water/Methyl isobutyl ketone (MIBK) biphasic system. The maximum HMF yield from fructose reached 96.8%. Bifunctional acidic resin catalysts effectively facilitated glucose conversion, with the recyclable and environmentally friendly Amb-15-Al catalyst achieving a 64.7% HMF yield. The mechanistic study and quantitative computational analysis indicated that glucose conversion was more favorable in water-containing systems than in pure deep eutectic solvents (DES). Furthermore, it also demonstrated the catalytic ability and energy barrier differences of Lewis acidic sites Al, Cr, and Sn ions for glucose isomerization in water-ChCl systems. This study presented a combination of a non-toxic and cost-effective reaction strategy and provided a theoretical calculation and experimental validation of the bio-refinery reaction mechanism.
研究领域:
生物化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS AND MANUFACTURING PROCESSES
·
2025
·
IF 4.7
Binfeng Pan,Jie Liu,Zhimin Zhang,Xuchen Lu
The process for preparing high-purity anhydrous yttrium chloride was investigated using a complex salt containing an excess of yttrium oxychloride. By studying the conversion of yttrium oxychloride, it was determined that the key to preparing high-purity anhydrous yttrium chloride lay in the synergistic actions of gas-solid and solid-solid reactions. On this basis, a purity control strategy involving the adjustment of the height-diameter ratio of the sample was proposed to inhibit hydrolysis and enhance the conversion rate. By adopting the purity control strategy, high-purity anhydrous yttrium chloride with a yttrium oxychloride content below 0.1 wt.% was obtained at 600°C when the height-diameter ratio of the samples exceeded 1.42. Finally, the experiments on preparing Mg-Y alloys through molten salt electrolysis validated the impact of the YCl3 purity on the electrolysis process. When the high-purity anhydrous yttrium chloride obtained by this strategy was utilized, the current efficiency could reach 83.7%.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Ziye Ling,Junwan Liu,Qianhao Wang,Wenzhu Lin,Xiaoming Fang,Zhengguo Zhang
MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectic has a proper melting point and high latent heat for solar water heating systems with latent heat storage . In this paper, the exact composition of the eutectic and the corresponding phase change temperature are determined by measuring the phase change characteristics of mixtures of MgCl 2 ·6H 2 O and Mg(NO 3 ) 2 ·6H 2 O in various ratios. MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectics, the melting temperature of which is around 58 °C, can be obtained with the mass fraction of MgCl 2 ·6H 2 O ranging from 35% to 50%. The eutectics are composited with porous fumed silica to improve its thermo-physical properties. The eutectic/SiO 2 composite retains a similar melting point of the pure eutectic, is of no liquid leakage even after melting while the SiO 2 weighs more than 15 wt%, and the specific enthalpy reaches 88.13 kJ kg −1 . The eutectic/SiO 2 composite has a thermal conductivity 5% higher than pure eutectics and better thermal stability and cycle stability. The thermogravimetric analysis shows its weight loss is 8.03% less than pure eutectic at 300 °C. And the eutectics suffers a decrease in phase change enthalpy after 100 thermal cycles by 9.2%, much lower compared with the 37.23% for pure eutectics due to the phase separation during the thermal cycles. Thermo-physical properties and stability of MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectic have been enhanced by fumed silica.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Meizhen Jiao,Jie Lu,Jinguang Hu,Jian Du,Yanna Lv,Jinwen Hu,Yehan Tao,Haisong Wang
In this study, we introduce a novel two-step method for efficiently separating and utilizing reed biomass. The process involves seawater and ammonium chloride (SW/AC) pretreatment followed by high solid-phase ethanolamine (ETA) pretreatment. During the SW/AC pre-processing stage, metal ions and chloride ions in seawater facilitated the depolymerization of hemicellulose into xylo-oligosaccharides (XOS), yielding 44.71 %. Subsequently, the two-step SW/AC-ETA pretreatment achieved a lignin removal rate of 80.34 % and rose to yields of glucose (99.10 %) and xylose (84.95 %). Characterization via FTIR, XRD, and SEM analyses revealed significant disruption of the lignin-carbohydrate complex structure in the reed, thereby increasing cellulose accessibility from 136.99 mg/g in raw material to 526.32 mg/g. This study offers a novel, environmentally friendly, and efficient strategy for separating reed components.
研究领域:
生物化学工程
·
可再生资源利用
✓ 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）