SOLAR ENERGY
·
2024
·
IF 6
Tong Jiang,Jun Hu,Shiliang Wu,Dekui Shen,Ping Lu
Using coal fly ash (CFA) as the skeleton material and binary sulfates of Na 2 SO 4 -K 2 SO 4 as the phase change material (PCM), high-temperature coal fly ash based phase change thermal storage materials (CPCM) were successfully synthesized. The influences of CFA fractions and types on the morphology, physicochemical properties, and thermal characteristics of the composites were intensively investigated. Results show that the heat storage density and thermal conductivity of CPCMs increase with the PCM content. Particularly, the CPCM60-A composite, comprising 60 wt% Na 2 SO 4 -K 2 SO 4 eutectic and 40 wt% CFA-A, exhibits excellent chemical compatibility and stable shape retention after sintering. Furthermore, CPCM60-A demonstrates the highest phase change latent heat of 60.43 J/g and thermal conductivity of 0.61 W/(m·K). The influence of CFA types reveals that CFA-A with a higher ratio of SiO 2 and Al 2 O 3 , lower carbon content, and a rich porous structure is more suitable to fabricate molten salt heat storage materials. This work demonstrates that CFA, a byproduct of coal-fired industry, is a promising skeleton material for the fabrication of high-temperature CPCM composites, offering a novel approach for enhancing the efficiency and cost-competitiveness of solar power and waste heat recovery systems.
研究领域:
材料科学
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储能技术
·
可持续材料
·
热工工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Rui-Zhi Cui
The experimental solubility of LiCl–Li 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O and KCl–K 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O systems was measured at 288.15 K. The corresponding stable phase diagrams and water content diagrams were plotted by experimental results. Double salt was formed in both two systems. There are six phase fields, nine univariant solution curves and four invariant points in the phase diagram of LiCl–Li 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O system. And the diagram of another system has seven invariant points and eight crystallization regions. By using multiple linear regression method, parameter Ψ Li,Cl,SO4 and the solubility equilibrium constants of double salt KCl·MgSO 4 ·3H 2 O were obtained by solubility data fitting at 288.15 K. The equilibrium solubility of salts in above systems at the same temperature was predicted with Pitzer's electrolyte solution model and mathematical calculation software. The results indicate that the predicted data are in correspondence with experiments.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 11
·1-10
·
IF 2.533
Di Jing,Gai Xikun,Jamakanga Ropafadzo,Lou Jie,Zhu Minzhi,Li Yin,Yang Ruiqin,Ma Qingxiang
To investigate the correlation between electrochemical performance and physicochemical properties, three types of 1D WO 3 nanostructures were fabricated by hydrothermal method using K 2 SO 4 , Na 2 SO 4 , and (NH 4 ) 2 SO 4 as capping agents. Hexagonal phase was obtained with the assistant of Na 2 SO 4 and (NH 4 ) 2 SO 4 , while monoclinic phase was developed using K 2 SO 4 as agent. WO 3 nanostructures prepared by (NH 4 ) 2 SO 4 and Na 2 SO 4 exhibited superior specific capacitance (400 F/g and 388 F/g) relative to WO 3 prepared by K 2 SO 4 (259 F/g), suggesting hexagonal phase is more suitable for energy storage. The nanostructures prepared using Na 2 SO 4 exhibited inferior rate performance compared with those obtained by (NH 4 ) 2 SO 4 due to low specific surface area and high crystallinity. The electrochemical performance demonstrated nanostructures prepared by (NH 4 ) 2 SO 4 was surface-controlled whereas those using Na 2 SO 4 and K 2 SO 4 were battery-type material. These findings raise the prospects of developing tungsten oxide for energy storage. Graphical abstract
研究领域:
材料科学
·
电化学
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纳米技术
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ORE GEOLOGY REVIEWS
·
2024
·
IF 3.2
Chen Chen,Linbo Shang,Yunhe Zhou,Ziqi Jiang,Xinsong Wang,I-Ming Chou,Jianguo Li,Zhenglong Wang
The quantitative study of the sulfate content in natural fluid inclusions (FIs) will help our understanding of the processes of metal transport and related mineralization. The sulfate-rich FIs typically contain several types of sulfates with diverse cations such as Na + , K + , and so on. In order to get the sulfates contents in natural FIs, in situ Raman spectral quantitative calibration method is used to calibrate the Li 2 SO 4 , Na 2 SO 4 , K 2 SO 4 and Cs 2 SO 4 solutions at temperatures ranging from 25 °C to 250 °C in our study. The results show that the A (SO 4 2− )/ A (H 2 O) ratio increases linearly with increasing m SO 4 2− in sulfate solutions containing single cation of Li, Na, K or Cs at the set temperatures, where A is Raman peak area and m is molality (mol/kg H 2 O), and a negative linear relationship exists between k (quantitative calibration coefficient) and temperature for sulfate solutions with specific cations up to 250 °C. Meanwhile, the slopes and the intercepts of the k-T correlation curves are obviously different among sulfate solutions with different cations, and the coefficients k of these sulfate solutions at certain temperature decrease with the increase of atomic number of the cation, in accordance with the following order: Li + > Na + > K + > Cs + . As Na + and K + are the main cations in the natural sulfate-bearing FIs, the quantification of the multi-cation (Na ± K ± Li) sulfate solutions was evaluated by using the Raman quantitative calibration curves of Li 2 SO 4 , Na 2 SO 4 , K 2 SO 4 and Cs 2 SO 4 separately, the errors exist due to the use of calibration curves with different cations; the average concentration errors derived from the use of Na 2 SO 4 or K 2 SO 4 Raman quantitative calibration curves are within about 5 %, while those from the use of Li 2 SO 4 or Cs 2 SO 4 Raman quantitative calibration curves are within about 15 %. Therefore, the acceptable errors suggest that the calibration curves of individual sulfates can be applied to the determination of sulfate content of natural sulfate-bearing FIs.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）