ACS Omega
·
2024
·
IF 3.7
Yuting Wang,Xiaochen Shi,Wenwen Li,Yajun Wang,Wenqing Yao
The generation of H2O2 through photocatalysis is increasingly recognized as a viable approach for addressing the energy and environmental challenges encountered in industrial production processes. In this research, we synthesized ultrathin (1 nm) poly(heptazine imide) (PHI) nanosheets as a photocatalyst by a one-step KCl molten salt process. The utilization of Fourier transform infrared and X-ray photoelectron spectroscopy substantiated that the interlayer-bonded potassium atoms induce polarization in water molecules, facilitating the attachment of hydroxyl groups on the surfaces of nanosheets. These groups serve as self-sacrificing entities, promoting the reaction that leads to the generation of H2O2. The preparation temperature and KCl doping amount factors for the H2O2 generation rate were investigated, and the mechanism of the KCl-bonded structure on photogeneration charge separation transport was analyzed. Owing to the elevated crystallization and the presence of surface self-sacrificing hydroxyl groups, the rate of H2O2 production reaches 6117.5 and 308.35 μmol·g–1·h–1 under visible-light irradiation (λ ≥ 420 nm) in isopropanol solution and pure water, respectively. These rates are 30 and 18.7 times higher than those observed for bulk g-C3N4, respectively. The photocatalytic kinetic processes for H2O2 formation and decomposition were also calculated to investigate the catalyst activities.
研究领域:
材料科学
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环境科学
·
化学
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DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Jia Zhao,Zhaoting Liu,Wenshuo Liang,Guimin Lu
This present work evaluates the local structure and electrochemical behavior of the LiCl-KCl-SmCl 3 melt to facilitate the efficient reprocessing of spent nuclear fuel (SNF). At 723 K, the radial distribution function, coordination number, and structure factors were adopted to understand the local structure of LiCl-KCl and LiCl-KCl-SmCl 3 based on first-principles molecular dynamics (FPMD) simulation. We found the SmCl 3 slight effect on LiCl-KCl melts in short-range order and its influence on the distribution of Li-Li intermediate-range order. Moreover, the diffusion coefficient of Sm(III) 2.012 × 10 -5 cm 2 /s in LiCl-KCl melts was determined by analyzing the mean square displacement. The electrochemical behavior of Sm(III) was conducted in the temperature range from 673 K to 823 K by a series of electrochemical methods. According to the theory of Matsuda and Ayabe, the Sm(III) + e - = Sm(II) is a quasi-reversible process. The diffusion coefficient of Sm(III) was measured by the chronoamperometry method, which verified the credibility of the FPMD simulation. Furthermore, this work explored the exchange current density of Sm(III)/Sm(II), whose value is between 0.826 × 10 -3 and 2.383 × 10 -3 A·cm −2 , by the linear polarization.
研究领域:
材料科学
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电化学
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核工程
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 13
·D606
·
IF 3.12
Kui Liu,Jiajia Sun,Liqi Zhu,Yuxue Sang,Weiqun Shi,Zhifang Chai,Biao Wang,Mingliang Kang
The aim of this work is to explore the electrodeposition of uranium in low-melting LiCl-KCl-CsCl eutectic. A variety of conventional electrochemical techniques, including cyclic voltammetry (CV), chronopotentiometry (CP), and chronoamperometry (CA), were employed to study the electrochemical and kinetic properties of uranium at different temperatures ranging from 573 to 872 K. First, the electrochemical behaviors and diffusion coefficients of uranium species in the melts were investigated and compared to the published results. The temperature significantly affects the cathodic current response of the U4+/U3+ couple within the low temperature range. Moreover, the nucleation mechanisms of uranium in the electrodeposition process were evaluated, and the results indicated that nucleation and growth tend to occur via the same instantaneous mode at all applied temperatures and overpotential ranges. Finally, metallic uranium was deposited by potentiostatic electrolysis at an overpotential of −100 mV vs. U3+/U at different temperatures, and their morphologies and compositions were characterized by SEM-EDS and XRD, respectively. The results show that from 573 to 773 K, uranium deposits evolve form one-dimensional needle-like to multidimensional dendritic structures. No dendrite-free uranium deposits were obtained in the CsCl-containing melts regardless of the temperature.
研究领域:
材料科学
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电化学
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核工程
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DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
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2023
·
IF 6
Junlong Mao,Jingjing Fu,Zhengyu Zhu,Danli Jin,Shike Shen,Yanwei Yuan,Yuewen Chen
The effect of ultrasound treatment combined with KCl instead of NaCl on the structure of myofibrillar proteins of semi-dried large yellow croaker was investigated by measuring protein oxidation indicators and observing structural changes. Compared with the fillets treated with NaCl combined with ultrasound, the fillets treated with KCl combined with ultrasound had high carbonyl content, low sulfhydryl content, small particle size, and strong surface hydrophobicity. In contrast, when KCl replaced 50% of NaCl, it was found that the oxidation was effectively alleviated, and intermolecular force was enhanced. According to structural changes, the irregular curvature of myofibrillar proteins accounted for a large number of smaller and more stable structures in KCl substitution with 50% NaCl. In conclusion, partial substitution of KCl for NaCl combined with ultrasound in the preparation of semi-dried rhubarb can protect myofibrillar protein structure and reduce oxidation to some extent.
研究领域:
食品科学
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蛋白质化学
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水产养殖
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yue Wang,Yiting He,Xianglin Ren,Xiaohui Guo,Xiaodong Tian,Chunju Xu,Huiyu Chen
Functionalization and pore engineering are two effective approaches to enhance the electrochemical performance via augmenting the surface area utilization of carbon nanofiber (CNF) mats. Compared with heteroatom-doping, designing the suitable porous structure under a mild and controlled thermal process remains a formidable task. In this work, porous N, O-codoped CNF mats were prepared by using coal tar pitch/polyacrylonitrile (CTP/PAN) precursor and KCl salt template. Notably, the KCl can not only serve as porogen, but also act as a heat scavenger during the heat treatment process to avoid local temperature overheating, which is conducive to the uniform dissipation of organic small molecules, leading to improved ion-accessible area. The sample treated with 0.5 g KCl shows high areal capacitance and excellent rate performance in both 6 M KOH and 2 M ZnSO 4 electrolyte. Furthermore, the assembled Zn-ion capacitor exhibits a high energy density of 505.93 μW h m −2 at the power density of 496.28 μW m −2 , and maintained a maximum power density of 45.94 mW m −2 while retaining an energy density of 313.91 μW h m −2 . The present method is efficient, and cost-effective, and can be extented to the preparation of other electrode materials with superior electrochemical performance.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Hongju Qiu,Yanqiong Zhang,Weiwei Huang,Jinhui Peng,Jin Chen,Lei Gao,Mamdouh Omran,Nan Li,Guo Chen
Tetragonal zirconia nanopowders (3Y-TZP NPs) stabilized by 3 mol % Y2O3 were synthesized by a novel sol–gel–flux method. The effects of calcination temperature, Y2O3 content, and molten salt system (NaCl + KCl binary system and NaCl unary system) on the phase composition and morphology of nanopowders (NPs) were investigated. Meanwhile, the sintering properties of the prepared 3Y-TZP NPs were studied. The 3Y-TZP NPs and sintered ceramics were characterized by thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) analysis, and X-ray fluorescence (XRF) spectroscopy. The results show that the optimum calcination temperature for obtaining dispersed ZrO2 NPs is reduced from 800 to 660 °C when the NaCl unary system is substituted by the NaCl + KCl binary system. 3Y-TZP NPs with a single tetragonal phase are obtained in the NaCl + KCl binary system when Y2O3 content in the raw material is 5 mol %. The average particle size of the obtained ZrO2 NPs is reduced from 47.25 nm in the unary system to 26.18 nm in the binary system because of the lower calcining temperature. Furthermore, the 3Y-TZP NPs obtained in the binary system have narrower particle size distribution and better sintering performance than ZrO2 NPs obtained in the unary system. After sintering for 4 h at 1200 °C, the former generated 3Y-TZP ceramics with higher density and finer grain size. This work produced narrow-distributed well-dispersed 3Y-TZP NPs with quasi-spherical morphology, which are good candidates for the applications, including oxygen sensors and thermal barrier coatings.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Haibo Shi,Ruyi Zhang,Jiabao Zheng,Xianqi Yao,Wei Wang,Igor Tomasevic,Weizheng Sun
The effects of NaCl partially substituted by KCl, MgCl 2 , and KCl/MgCl 2 on the gel characteristics, oral mastication, and in vitro gastric digestion of myofibrillar protein (MP) gel were investigated. The results indicated that partial substitution of NaCl by KCl or MgCl 2 did not cause obvious deterioration of gel properties within 30 % substitution levels. MgCl 2 substitution significantly increased the surface hydrophobicity of MP, and formed homogeneous network structure for effective limitation of moisture loss. The MgCl 2 -substituted gel exhibited relatively lower viscosity and hardness for better swallowing. The high pepsin diffusivity in MgCl 2 -substituted gel (59.57 ± 4.28 μm 2 /s, 30 %-Mg group) improved protein hydrolysis, and produced more shorter peptides due to the loose and relatively uniform structure compared to those of the gels only containing NaCl and partial KCl. Therefore, the changes of textural parameters, microstructure, and water mobility in sodium-reduced gel with different substitution levels could influence the subsequent gastric digestion characteristics.
研究领域:
食品科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Dandan Gao,Dongdong Li,Bin Hu,Wu Li
A temperature-dependent thermodynamic model was developed for representing the solid–aqueous equilibria in the quaternary NaCl + KCl + RbCl + H2O system based on the previous ones for binary and ternary systems. The solid–liquid equilibria in the quaternary system were first predicted by the developed model and then verified by conducting the experiments at T = 298.15 K by an isothermal equilibrium method with equilibration times of 5 and 160 days, respectively. The predicted univariant curve saturated with NaCl(cr) and (K,Rb)Cl(ss) in the system is in good agreement with our experimental data. Moreover, to verify the reliability of the model for the prediction of solid solution composition that coexisted with NaCl(cr), the XRD quantitative analysis technique based on the inverse Vegard approach is used. The experimentally determined solid solution compositions well support the results predicted by the model, indicating that the model can simultaneously predict the compositions of aqueous solution and solid solution that coexisted with a pure salt, i.e., NaCl(cr), in a system under an equilibrium state. Finally, phase diagrams of the quaternary NaCl + KCl + RbCl + H2O system at a temperature range of 273.15–373.15 K were predicted. These diagrams are useful for the future industrial applications.
研究领域:
物理化学
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热力学
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材料科学
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Haitao Zhang,Hailong Kang,Shuang Ma,Qirong Yang,Youping Li,Chenxuan Yan,Xinsong Wang,Yong Dong
Composite chloride salts have become molten salt heat storage materials with high development potential due to their excellent heat storage performance. Since chloride salts are prone to leakage, they need to be adsorbed onto porous materials to prepare composite phase change materials (CPCMs). Changes in the pore size of porous materials will lead to changes in the scale of chloride salts. Currently, there is little research on the impact of scale variation on the thermophysical and phase change characteristics of composite chloride salts, and the underlying mechanisms are not yet clear. With the ZnCl 2 -NaCl-KCl (3:1:1 mol%) eutectic salt as the phase change material (PCM), this study integrates molecular dynamics (MD) simulation with an experimental approach to investigate the impact of scale on the thermophysical properties and phase change properties of CPCM. The inherent influence mechanism of scale effect is analyzed from a microscopic perspective. The results indicate that as the scale increases, the interaction energy between molecules within the system gradually increases, and the system structure becomes more compact. The thermal conductivity first increases and then decreases, reaching a maximum of 0.45 W/(m·K) at 8 nm; the volumetric thermal expansion coefficient gradually decreases. As the scale increases from 3 nm to 15 nm, the melting temperature rises by 8.1 %, while the solidification temperature decreases by 1.73 %, resulting in a significant increase in the degree of supercooling. The latent heat gradually increases with scale, which is consistent with the coordination number.
CAS / MDL:
研究领域:
材料科学
·
热能工程
·
储能技术
·
分子动力学模拟
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产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Buju Guo,Yaowu Wang,Ruoyu Li,Yifei Li,Boxiong Zhang,Jianping Peng,Yuezhong Di,Ke Wang,Chang Wang
Scrap aluminum (Al) alloy recycling is critical for energy conservation and decreasing carbon emissions. Conventional remelting process does not remove alloying elements, severely limiting the value and applications of recycled Al. To overcome this limitation, this study develops an efficient process for recovering pure Al from scrap Al alloys via soluble anode electrolysis in a designed MgCl 2 -KCl-NaCl (MKN) molten salt system. Real-time monitoring of the electrolysis process, time-dependent characterization of cathodic deposits, and electrochemical analyses reveal a three-stage cathodic deposition mechanism in the MKN molten salt system: initial underpotential deposition of Mg 2+ transitions to co-deposition of Mg 2+ and Al 3+ , and ultimately to exclusive reduction of Al 3+ , which is driven by progressive Al 3+ accumulation. The introduction of AlCl 3 proves pivotal, simultaneously enhancing Al 3+ deposition efficiency while effectively suppressing Mg 2+ co-reduction. Systematic optimization identifies 12.5 wt% AlCl 3 addition, 500 °C, and 0.15 A/cm 2 as the ideal operational parameters, achieving recycled Al with 99.84 wt% purity. The soluble anode electrolysis process in the MKN molten salt system represents an efficient and scalable alternative to conventional remelting. The developed process is capable of producing recycled Al with purity comparable to that of primary Al while addressing critical sustainability challenges in the Al industry.
研究领域:
材料科学
·
冶金学
·
电化学
·
可持续技术
·
回收工程
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 4
·1353-1365
·
IF 1.6
Wang Zhaoyang,Shen Yubo,Zhang Yinshan,Liu Yuhui,Dong Zhimin,Quan Meiyang,Yu Fengtao,Cao Xiaohong,Zhang Zhibin,Wang Yingcai,Liu Yunhai
In order to improve the utilization of spent fuel, electrolysis is used to recover fissile elements from nuclear waste samarium. The electrochemical behaviors of Sm(III) and Pb(II) were examined by CV, SWV, and OCP techniques in LiCl–KCl molten salts at 773 K. The redox mechanism of Sm(III) ions on the liquid Pb thin film electrode was analyzed. The results demonstrate that Sm(III) electro-reduction at the inert W electrode only occurred in a soluble–soluble electrochemical transition Sm(III)/Sm(II). Additionally, the kinetic parameters of samarium and lead ions were computed. The activation energies of diffusion for Sm(III) and Pb(II) were 32.92 kJ mol −1 and 35.21 kJ mol −1 , respectively. SmPb 3 and Sm 2 Pb intermetallic compounds were derived using constant potential electrolysis and constant current electrolysis at the Pb electrode in a molten salt system. The cathodic deposition output was characterized by XRD and SEM–EDS. The ICP-AES results showed that the average extraction ratio of Sm on the Pb electrode was about 94.23%.
研究领域:
核化学
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电化学
·
材料科学
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DOI
高影响因子
Metals
·
2023
·Vol. 13
·期 8
·1436
·
IF 2.9
Jialong Kang,Yaoran Cui,Dapeng Zhong,Guibao Qiu,Xuewei Lv
Due to TiAl alloys’ excellent properties, TiAl alloys have received widespread attention from researchers. However, the high energy consumption and lengthy process of traditional preparation methods have always limited the large-scale application of TiAl alloys. This article develops a new method for preparing TiAl-based alloy powder via the magnesium thermal reduction of TiO2in AlCl3-KCl molten salt. In this study, the proportion of AlCl3&KCl molten salts was determined. We conducted phase analysis on the final product by studying the changes in temperature and time. It was found that the TiAl3alloy powder could be obtained by being kept at 750 °C for 2 h, with an oxygen content of 3.91 wt%. The reaction process for the entire experiment was determined through thermodynamic calculations and experimental analysis, and the principles of the reduction process are discussed.Keywords:TiAl alloy;magnesium reduction;AlCl3-KCl;TiO2
研究领域:
材料科学
·
冶金学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）