Materials Today Nano
·
2022
·
IF 13.364
Dongxing Huo,Hua Tian,Weiguang Wang,Gequn Shu
Low-grade heat widely exists in nature and industry processes. Due to the lack of effective recovery technologies, a large amount of low-grade heat is wasted. Thermally regenerative electrochemical cycle (TREC) system can efficiently convert low-grade heat into electrical energy. However, the low power density limits the practical application of TREC system. To improve the power density and heat-to-electricity conversion efficiency, a TREC system with Na/K mixed electrolytes (4 M sodium nitrate [NaNO 3 ] + 1 M potassium nitrate [KNO 3 ]) is proposed. When the temperature difference of the system is 34°C (between 46 °C and 12 °C), the heat-to-electricity conversion efficiency can be as high as 3.9% (relative Carnot efficiency of 36.4%). At the current density of 40.16 mA/g , the power density can reach 23.29 mW/g, increasing to 6.5 times of conventional system, which is the highest level in TREC system. The comprehensive results of electrochemical test and elemental analysis show that K + has superior electrochemical reaction characteristics. The proposed sodium/potassium (Na/K) mixed electrolyte system improves the power density and heat-to-electricity conversion efficiency by reducing the voltage hysteresis and increasing the operating current and voltage.
研究领域:
能源工程
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电化学
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可持续能源
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热能转换
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2022
·
IF 3.119
Song Lin,Yufan Pang,Jingwei Cao,Yueyang Jiang,Houchun Yan,Qingsong Li
For the separation of 2,2,2-trifluoroethanol in water, two alcohols and two ketones were chosen as extractants for experiments at 101.3 kPa and 298.2 K. The liquid–liquid equilibrium data for water + 2,2,2-trifluoroethanol + (4-methyl-2-pentanol, methyl isobutyl ketone, methyl isopropyl ketone, and benzyl alcohol) were measured under these conditions. The separation effects of the four solvents were assessed by the distribution coefficient (D) and the separation factor (S). Meantime, the interaction parameters were obtained by fitting the experimental data using NRTL and UNIQUAC models, and both values of AAD and rmsd were less than 0.43%. The GUI-MATLAB series of topological analysis tools were used to check the accuracy of the measured values with the binary interaction parameters.
研究领域:
化学工程
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热力学
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分离科学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Qi Zhang,Yonghong Hu,Ying Shi,Yang Yang,Limin Cheng,Cuicui Cao,Wenge Yang
Data on corresponding solid–liquid equilibrium of dibenzothiophene (DBT) in different solvents are essential for a preliminary study of industrial applications. In this study, the solubility behavior of DBT in different solvents, such as methanol, ethanol, isopropyl alcohol, butan-1-ol, formic acid, and acetonitrile at temperatures ranging from (278.15 to 328.15) K was investigated. An analytical stirred-flask method was employed to measure the dissolubility of DBT. For the temperature range investigated, the solubility of dibenzothiophene in the solvents increased with increasing temperature. The thermodynamic models, such as the Van ‘t Hoff model, the modified Apelblat model and the Buchowski–Ksiazaczak λh model were investigated to describe the experimental data. It was found that the modified Apelblat model was the most suitable for predicting the solubility behavior of DBT with a temperature increment. The calculated thermodynamic parameters indicated that in each studied solvent the dissolution process of DBT is endothermic.
研究领域:
化学热力学
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溶解度工程
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分离过程
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物理化学
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DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Yao Lu,Miaoyan Song,Jieyou Huang,Le Zhang,Binyu Zhao,Wenwei Wu,Xuehang Wu
Charging P2-type Na 0.66 Ni 0.33 Mn 0.67 O 2 (NNM) to a high upper cut-off voltage of 4.3 V (vs. Na + /Na) can yield a competitive discharge voltage (3.6 V-class) and capacity. However, achieving stable cycling for NNM under this condition remains challenging owing to an unfavorable phase transition and a large lattice-volume change. Herein, a dual-site doping strategy is used to simultaneously realize a pinning effect at the Na and transition metal sites. Incorporating pinned K + and Zn 2+ ions considerably enhances the structural stability of NNM, affording a complete single-phase reaction with ultralow strain (only 0.54 % variation in volume) during Na + insertion/extraction. The synergistic contributions of dual-site doping to the enhanced electronic conductivity , lowered Na + migration barrier, and increased Na + diffusion coefficients are confirmed via theoretical calculations. Consequently, the K + /Zn 2+ dual-site-doped Na 0.63 K 0.03 Ni 0.26 Zn 0.07 Mn 0.67 O 2 delivers satisfactory discharge capacities of 118.6 and 63.2 mAh g −1 at 10 and 2000 mA g −1 , respectively, and achieves an excellent capacity retention of 81.2 % after 200 cycles at 500 mA g −1 . This study provides a promising method to strengthen the stability of the Ni − Mn-based layered framework and optimize other high-voltage and high-capacity layered oxide cathode materials .
研究领域:
材料科学
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电化学
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储能技术
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电池技术
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无机化学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2023
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IF 3.6
Mingsheng Cai,Tianchun Lang,Shuangqiang Fang,Tao Han,Damir Valiev,Houjiang You,Chong Liu,Jing Yu,Peng Su,Xiaolong Jing,Guanghui Ge,Bitao Liu,Elena F. Polisadova
Fluorescent materials are widely used for anti-counterfeiting of information security and commodities. However, the increasing requirements for fluorescent anti-counterfeiting technology urgently require the development of novel fluorescent materials with multicolor fluorescence, single component, and excellent stability. Herein, a color tunable Ba 0·94 Ca 0.06 ScO 2 F: Eu 2+ , Bi 3+ , K + perovskite with dependence of excitation wavelength for high-level anti-counterfeiting is reported. The fluorescence spectra of Ba 0·94 Ca 0.06 ScO 2 F: Eu 2+ , Bi 3+ , K + perovskite show the tunable emission band with the peak between 479 and 509 nm. It is worth noting that the peak intensity ratio at 479 and 509 nm changes with the dependence of the excitation wavelength. Meanwhile, the snowflake pattern is designed to demonstrate the potential applications in anti-counterfeiting, which obviously shows four different color patterns under the sunlight, 320 360, and 415 nm excitation, respectively.
研究领域:
材料科学
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光学材料
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防伪技术
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发光学
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光子学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 37
·9545-9551
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IF 5.256
Jian-Min Li,Jie Fang
An anthracene vapor-assisted inverse transport growth mechanism of unsupported ultrathin two-dimensional (2D) superconducting single-crystal niobium (Nb) and niobium diselenide (NbSe2) nanoplates (thickness ∼2.5 nm) using anthracene and NbSe2 powders as precursors is reported. Besides the whisker-like counterparts, the anthracene vapor hierarchical invasion into NbSe2 leads to 2D Nb nanoplates with a {110} surface and 2D few-layered {0001} NbSe2 nanoplates grown in the high-temperature residual region, while sub-millimeter selenium whiskers are found in the low-temperature transporting region. Direct magnetization measurements demonstrated that superconductivity at ∼3.3 K was clearly observed in the unsupported ultrathin Nb and NbSe2 nanoplates. These findings may offer a new way to produce freestanding single-crystal 2D superconductors and elemental 2D metallic nanoplates.
研究领域:
材料科学
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凝聚态物理
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纳米技术
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超导物理
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二维材料
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DOI
高影响因子
Journal of Chemistry
·
2021
·Vol. 2021
·期 1
·4541213
·
IF 2.506
Zhenzhen Jiang,Chi Ma,Gaoling Liu,Kangrui Sun,Mingli Li,Yafei Guo,Lingzong Meng,Tianlong Deng
To effectively develop the rare earth elements resources from the geothermal waters, it is essential to understand the volumetric properties of the aqueous solution system to establish the relative thermodynamic model. In this study, densities of YCl 3 (aq) at the molalities of 0.08837–1.60639 mol·kg −1 from 283.15 K to 363.15 K at 5 K intervals and ambient pressure were measured experimentally by an Anton Paar digital vibrating-tube densimeter. Based on experimental data, the volumetric properties including apparent molar volume ( V ϕ ) and the coefficient of thermal expansion of the solution ( α ) of the binary systems (YCl 3 + H 2 O) were derived. The 3D diagram ( m i , T , V ϕ ) of apparent molar volumes against temperature and molality was plotted. On the basis of the Pitzer ion-interaction model of electrolyte, the Pitzer single-salt parameters ( , , and ) for YCl 3 and temperature-dependence equation F ( i , p , T ) = a 1 + a 2 ln(T/298.15) + a 3 (T-298.15) + a 4 /(620-T) + a 5 (T-227) as well as their coefficients a i ( i = 1–5) in the binary system were obtained for the first time. The values of Pitzer single-salt parameters of YCl 3 agree well with the calculated values corresponding to the temperature-dependence equations, indicating that single-salt parameters and temperature-dependent formula obtained in this work are reliable.
研究领域:
溶液化学
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热力学
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无机化学
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稀土资源
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地热化学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Yongyi Li,Wei Li,Zhigang Shao,Huiyang Xu,Shuanglong Li,Bo Wang,Xiaorui Huang,Shichao Jiao,Zhiwei Li
Photocatalytic production of hydrogen peroxide from water is regarded as an environmentally benign technology for energy storage and supply. Herein, a disordered K&Na-C 3 N 5 photocatalyst co-intercalated with K + &Na + and modified by cyano/hydroxyl groups is successfully fabricated via alkali-activated thermal-polymerization. Alkali activation effectively anchors cyano and hydroxyl active groups on the surface: hydroxyl groups enhance the material's hydrophilicity and promote proton transfer, while cyano groups exhibit electron-attracting characteristics to localize photogenerated electrons. Simultaneously, interlayer intercalation of K + &Na + forms electron transport channels, synergistically facilitating surface proton transfer and optimizing charge distribution. This multi-component modification strategy significantly enhances the adsorption capacity of O 2 , effectively modulates the 2e − ORR pathway, and improves the selectivity of H 2 O 2 , demonstrating its excellent bifunctional properties. Experimental data show that the optimally alkali-activated K 3 &Na 3 -C 3 N 5 achieves a remarkably high H 2 O 2 production rate of 26,920.49 μmol g −1 ·h −1 — a 90.3-fold increase over unmodified C 3 N 5 . This work pioneers alkali activation as a universal and scalable paradigm for engineering surface-active sites to enable performance amplification through functional group-metal ion cooperativity, and it provides a design blueprint for advanced carbon nitride-based photocatalysts to boost H 2 O 2 fuel cell performance.
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Shihua Dong,Weizhen Sun,Yueyang Jiang,Bing Jia
Liquid-liquid equilibrium (LLE) data for {water + furfuryl alcohol + solvent (isopropyl ether, tert-butyl methyl ether, dichloromethane and methyl isobutylcarbinol)} ternary systems were determined at T = 298.2 K and p = 101.3 kPa. The distribution coefficients and separation factors were evaluated and the results showed that those solvents can effectively for furfuryl alcohol recovery from aqueous solutions. The Othmer-Tobias, Bachman and Hand equations were employed to validate the reliability of the experimental LLE data. Additionally, the experimental LLE data were correlated using the NRTL and UNIQUAC models and the binary interaction parameters were optimized. The root mean square deviations (RMSD) between the correlated data by NRTL and UNIQUAC models and the experimental LLE data were less than 0.36%, which demonstrated that both models can correlate experimental LLE data successfully.
研究领域:
化学工程
·
热力学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 43
·17104-17110
·
IF 8.262
Wenzhe Li,Jiangwei Li,Jiaoli Li,Jiandong Fan,Yaohua Mai,Liduo Wang
The poor stability of hybrid organic–inorganic perovskite is one of crucial problems limiting the practical application of the perovskite solar cells (PSCs). All-inorganic lead-free perovskite materials, with Cs replacing the organic cations and Sn replacing Pb, have shown great potential in achieving high thermal stability. However, tin-based perovskites have inevitably suffered from severe bulk recombination, attributed to Sn vacancies. In this work, we obtain CsSnIBr2 thin films with low Sn vacancy assisted by the addition of hypophosphorous acid (HPA). The HPA additive here as complexant is demonstrated to be capable of speeding up the nucleation process while inhibiting the formation of Sn4+ during the formation process of CsSnIBr2 thin films. With a mesoscopic architecture, the CsSnIBr2 PSCs exhibit efficiency-loss free in 77 days and remarkably stable power output within 9 hours at high temperatures up to 473 K.
研究领域:
材料科学
·
光伏技术
·
无机化学
·
能源材料
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DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 2
·450
·
IF 3.9
Muhammad Naeem Younis,Zhiheng Ren,Chunshan Li,Erqiang Wang,Jie Li
The advancing effects of various alkali and alkaline earth metals (inclusive of K, Ca, and Sr) modified Cu/SiO2catalysts, prepared with a modified precipitation-gel method, were investigated for the production of ethanol via hydrogenation of methyl acetate. Our results showed that Sr-doped catalysts exhibited the best and most consistent results during catalytic tests. A series of techniques, including X-ray diffraction technique, Raman spectroscopy, N2adsorption/desorption, N2O titration method, FTIR spectroscopy, and H2temperature, programmed desorption and reduction (TPD and TPR), and X-ray Photoelectron Spectroscopy, which was used to check the detailed characterization of Sr modification in the catalyst and its structural impacts on the properties of the catalyst. These results demonstrated that the addition of 5%Sr could strengthen the intrinsic stability of the catalyst by formulating the appropriate ratio of Cu+/(Cu0+ Cu+) to facilitate catalytic outcome improvement. The addition of 5%Sr-30%Cu/SiO2under the most favorable conditions, resulting in the peak conversion of MA (95%) and ethanol selectivity (96%), indicates its magnificent catalytic stabilizing effects. Furthermore, the best performing catalyst was compared and tested under various conditions (LHSV and temperatures) and a 300 h long life run.Keywords:hydrogenation;methyl acetate;ethanol;strontium
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Lijie Chen,Yuan Gao,Junjie Lian,Le Li,Dexin Ding,Zhongran Dai
Photocatalytic reduction of soluble hexavalent uranium to insoluble tetravalent uranium is a promising strategy for uranium-containing wastewater treatment, while this method generally requires anaerobic conditions and/or the addition of sacrificial agents. Obviously, providing anaerobic environment and sacrificial agent will not only increase the cost but also causes secondary pollution. Thus, efficient removal of U(VI) by photocatalytic techniques under air atmosphere without sacrificial agents is an urgent task and great challenge. In this work, a novel O, K co-doped g-C 3 N 4 (OKDCN) photocatalyst was synthesized by a simple thermal reaction for the photoreduction removal of U(VI) under air atmosphere without sacrificial agents. Batch experiments show that the OKDCN-2 can nearly completely remove U(VI) in the solution within 120 min at pH 5.0. In addition, the OKDCN showed excellent reusability and selectivity in the process of photocatalytic reduction of U(VI). Further mechanism studies show the doping of O and K can improve the photogenerated carrier transfer and separation efficiency of OKDCN, and then improve the performance of photocatalytic reduction of uranium. These results provide a reference for breaking through some bottleneck issues in the research field of photocatalytic removal of U(VI).
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产品关联
DOI
高影响因子
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