CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Mengyue Ma,Zhihua Zhang,Yu Huan,Wang Liu,Mingwen Zhao,Tao Wei
Oxide-ionic conductors are broadly used as catalytic, conducting and detecting materials under oxidizing, reducing, inert or mixed environments. However, their current issue is the demand of high work temperatures (> 600 °C) to maintain high oxide-ion conductivity (> 0.1 S cm −1 ). This work develops a Pb 5 CaBi 10 O 21 (PCBO) ceramic, and its low melting point corresponds to the low binding energy of metal-O, which facilitates the generation of lattice oxygen vacancies and the migration of oxygen ions. PCBO lowers the working temperature to 300–500 °C, and demonstrates the highest oxygen-ion transport of ever reported oxide-ionic conductors, showing 0.68 oxide-ionic transport number, 0.353 ml min −1 cm −2 oxygen flux and 0.16 S cm −1 oxide-ionic conductivity (3–5 orders of magnitudes higher than YSZ or SDC at 500 °C). The high oxide-ionic percentage and conductivity were further demonstrated by the voltage/power output of SOFCs with PCBO as electrolyte. The experimental investigation and density functional theory calculation both demonstrate the easy formation and migration of V O in PCBO, explaining its high oxygen-ion transport.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 27
·12146-12152
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IF 2.7
Henan Zhang,Qi Liu,Alena Novoselova,Valeri Smolenski,Kewei Jiang,Yongde Yan,Milin Zhang,Jun Wang
The reactions of oxygen and samarium ions in molten NaCl–2CsCl eutectic in the temperature range of 823–913 K have been investigated by potentiometric titration in an inert gas atmosphere. The activity of oxygen ions in the studied melts was monitored using a standard YZME (indicator) electrode based on Y2O3-stabilized ZrO2 with a solid–electrolyte membrane. The titration of Sm3+ by O2− ions demonstrated the formation of insoluble SmOCl compounds in the investigated region. The mechanism of formation of SmOCl and Sm2O3 was established by the analysis of potentiometric titration curves. Subsequently, the solubility of SmOCl and Sm2O3 in the melt was calculated using the material balance equation and solubility constant equation. Finally, the basic thermodynamic properties of SmOCl and Sm2O3 in molten NaCl–2CsCl eutectic were calculated, and the properties of samarium in the melt were summarized using the Pourbaix-type (E-pO2−) diagram to determine the kinds of stabilized samarium compounds. Furthermore, the optimal chlorination conditions can be obtained from the E-pO2− diagram of Sm.
研究领域:
化学
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材料科学
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
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IF 7.7
Minghui Yang,Ce Sun,Liang Chang,Song Liu,Dingyuan Zheng,Yang Chen,Xiaoxiao Sun,Haiyan Tan,Yanhua Zhang
The generation of negative air ions (NAI) by furniture contributes to indoor air purification and enhances the living environment. However, commercially available furniture typically relies on surface coatings to release NAI. Over time, the degradation of these coatings leads to a significant decline in NAI release performance, presenting a persistent challenge for sustained effectiveness. Here, a novel sustainable wood-based negative air anion generator (SWNG) had been developed, utilizing a cellulose framework as the substrate. The in-situ synthesis of polylactic acid (PLA) within the wood incorporated titanium dioxide (TiO 2 ), tourmaline (TL), and cellulose acetate, firmly anchoring these materials within the wood structure. Compared to the cellulose framework alone, the NAI production of the SWNG had increased by 406.67 %. The impregnation with PLA enhanced the enduring photocatalytic activity of TiO 2 and TL in this innovative wooden NAI generator. After undergoing 200 cycles of testing between −40 °C and 50 °C, it continued to sustain NAI production, demonstrating exceptional antibacterial performance. Overall, this study introduced a novel sustainable wood-based negative air ion generator as a highly stable material with sustainable properties, offering significant potential for applications in improving indoor air quality and in the domain of home construction.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
Advanced Sustainable Systems
·
2022
·Vol. 6
·期 12
·2200346
·
IF 6.737
Xiaohan Sun,Qianqian Yu,Zhaolin Yang,Senwei Hu,Haiyue Yang,Xin Wang,Jiazuo Zhou,Yuan Yu,Chengyu Wang,Yudong Li
The demand for improved indoor air quality has grown with improvements in the standards of living worldwide. While wood is widely used to construct furniture since it is a renewable resource and aesthetically pleasing, it is also flammable, which limits its applications. Although there have been extensive research efforts in reducing the flammability of wood products, current approaches often have adverse effects on the environment. In this work, a novel organo-inorganic coordination system is proposed to prepare a fire-retardant and smoke suppression wooden “air purifier” using a vacuum impregnation method. The “air purifier” is composed of tourmaline particles/KH550 (TPs/KH550) and delignified wood. The added TPs give the final composites capable to purify air (1000 psc cm −3 negative oxygen ions [NOIs]). Compared with pristine wood (PW), total heat release (THR), peak heat release rate (HRR), and smoke production rate (SPR) of the wooden “air purifier” are reduced by 47.88%, 11.73%, and 82.81%, respectively, highlighting that the composites have good fire-retardancy and smoke suppression performances. Life cycle assessment (LCA) results indicate the composites have minimal environmental impact (EI) in 15 categories. This green, eco-friendly wooden “air purifier” with fire-retardant and smoke suppression properties has a great potential application in furniture and buildings.
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF CEREAL SCIENCE
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2023
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IF 3.8
Baihui Wang,Jingjing Luo,Qingling Zhang,Xing Cao,Yanjuan Zhang,Zuqiang Huang,Huayu Hu,Tao Gan
Brown rice is susceptible to oxidation of lipids during storage, resulting in the deterioration of cooking quality and the loss of nutrients. The negative oxygen ions (NAIs) have the functions of high permeability, antioxidation, and sterilization, but the application of NAIs for the storage of brown rice is less. In this study, brown rice is stored in a high temperature and humidity (temperature of 42 °C, humidity of 75%) NAIs environment, and its storage and physicochemical properties are investigated. After 12 d of storage in the NAIs environment (NAIs concentration of 2 × 10 4 ions/cm 3 ), the fatty acid value, catalase activity, and viability of brown rice are 10.51 mg KOH/100 g, 0.94 U/mg, and 72%, respectively, which are better than that in high temperature and humidity air environment, showing good storage performance. The internal structure, crystalline shape, and relative crystallinity of brown rice are insignificant broken, and the steaming quality does not change significantly with the extension of storage time. The results show that the NAIs environment has potential to extend the storage time and maintain the eating quality and nutrition of brown rice in storage, which can be used as a green and low-cost storage strategy for crops.
研究领域:
食品科学
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储藏技术
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高影响因子
INORGANIC CHEMISTRY
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2025
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IF 4.7
Gaoqing Hang,Qiulei Li,Alberto José Fernández-Carrión,Sihao Deng,Lunhua He,Xiaojun Kuang,Xiaoyan Yang
Oxide-ion conductors based on tetrahedral anion-related oxides have attracted considerable attention due to their high oxygen-ion conductivity and potential applications in clean energy devices, such as solid-state fuel cells. In this study, we report the improvement of oxide-ion conductivity by Sr2+ doping in isolated tetrahedral zircon-type PrVO4. It is found that Pr0.975Sr0.025VO4−δ features the highest oxide-ion conductivity of 2.62 × 10–3 S·cm–1 at 800 °C under air, with an oxygen transport number of 0.93. The formation and stabilization of oxygen vacancy defects, as well as the oxide-ion migration mechanism in PrVO4, were investigated through combining experimental characterizations and computing simulations. The results indicate that the concentration of oxygen vacancy defects increases with Sr2+ substitution, and the vacancies are accommodated by the formation of corner-sharing V2O7 dimers. Oxygen-ion migration proceeds via a cooperative mechanism involving V2O7-dimer breaking and reforming assisted by synergistic rotation and deformation of neighboring VO4 tetrahedra. The results provide valuable insights for further investigation and optimization of zircon-type oxides as potential oxide-ion conductors for electrochemical devices.
研究领域:
材料科学
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固体离子学
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能源材料
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计算材料科学
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电化学器件
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PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 11
·2644-2658
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IF 7.779
Xiaoyan Yang,Xiaoling Zeng,Xing Ming,Li Yang,Alberto J. Fernández-Carrión,Sihao Deng,Lunhua He,Xiaojun Kuang
BiVO4 scheelite is one of the few tetrahedra-based structures able to display vacancy-mediated oxide-ion conduction upon the use of an acceptor-doping strategy, leading to oxide-ion migration. In order to modulate the ionic migration process, it is of utmost importance to understand the different parameters affecting it. Here we review phase formation, oxygen vacancy stabilization, and migration for a wide variety of acceptor metal dopants in scheelite BiVO4. Among them, Ca2+-doped materials present the widest solid-solution range, leading to optimized oxide-ion conductivities at moderately high temperatures (σb: ∼10−3 S cm−1 at 500 °C), mainly as a result of their smaller size mismatch with Bi3+ and lower oxygen vacancy defect energy. The results gathered herein provide a useful guide for designing new oxide-ion conductors and tailoring oxide conductivity through the proper selection of doping agents according to several criteria, such as the oxygen defect formation energy, atom size mismatch, polarizability, and bond-dissociation energy with oxygen.
研究领域:
材料科学
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无机化学
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固体离子学
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能源材料
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电化学
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高影响因子
ANALYTICAL CHEMISTRY
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2025
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IF 6.7
Chenlu Lin,Xiao Yang
Molten CaCl2 is a viable solvent and electrolyte for extracting target elements from their oxides through electrolysis. However, the accumulation of O2– during electrolysis presents a significant challenge for the commercial application of CaCl2-based technologies. Understanding the behavior of O2– in the melt is crucial for optimizing the process. To address this, we developed an electromotive force (EMF) measuring system to monitor O2– behavior during the Si electrodeposition in molten CaCl2. We explored the thermodynamic properties of O2– in molten CaCl2–CaO (XO2– < 0.03) at 1123 K. The relationship between activity and molar fraction of O2– was established as aO2– = XO2–2.2, indicating strong interactions between O2– and other ions in the melt. EMF measurements confirmed the accumulation of O2– during the electrolysis in molten CaCl2–CaO–SiO2, as evidenced by the significant increase in aO2–. Notably, this accumulation becomes more pronounced with larger cathode areas, which leads to greater carbon contamination. Further investigation revealed that solid SiO2 effectively reduces aO2– in molten CaCl2–CaO to lower levels. By immersing solid SiO2 in melt during electrolysis, the accumulation rate of O2– is slowed, thereby inhibiting carbon contamination and improving current efficiency. These findings provide valuable insights into the use of the EMF measuring system as an effective tool for revealing O2– behavior and optimizing electrolysis processes in molten CaCl2.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
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2024
·
IF 5.2
Jun Wang,Jianyu Li,Chunyu Jiang,Jianbo Song,Xing Yang,Xiaolong Ma,Kailiang Luo,Peng Wu,Xiaoyu Chong,Jing Feng
Thermal barrier coatings (TBCs) materials with lowered thermal and oxygen ion conductivity can provide thermal and oxidative protection for high temperature hot-end components in aeronautical engines and gas turbines . The rare-earth tantalate RETaO 4 (RE = Dy, Gd and Sm) ceramics with monoclinic (m) phase were successfully synthesized via spark plasma sintering . Oxygen vacancies responsible for the thermal and oxygen ion conductivities of RETaO 4 were demonstrated by atomic-resolution energy dispersive X-ray and X-ray photoelectron spectroscopy . Among the three samples, DyTaO 4 has excellent oxygen/thermal barrier performance. Compared to the current service thermal barrier coating material ZrO 2 -8 wt% Y 2 O 3 (8 YSZ), DyTaO 4 has an ultra-low oxygen ion conductivity benefiting from low oxygen vacancy concentration and strong stretching force constants. The intrinsic thermal conductivity of DyTaO 4 is 68.2% less than that of 8 YSZ . Additionally, the thermal expansion rate curves indicate that the phase transformation does not happen from room temperature to 1200 °C. The above results demonstrate that high-growth rate thermally grown oxide can be retarded by creating dense DyTaO 4 coating with lowered thermal and oxygen ion conductivity.
研究领域:
材料科学
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航空工程
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2023
·
IF 4.6
Yun Liu,Yueyue Rui,Bingyan Yu,Lihu Fu,Gang Lu,Jie Liu
Negative air ions are becoming increasingly popular as they purify the air by adsorbing dust and hazardous substances, which are beneficial to people's health. The ternary composites of tourmaline and monazite with graphene, germanium , cerium oxide , lanthanum oxide, and titanium oxide were prepared by the ball milling process, and the release of negative oxygen ions was investigated. The enhanced mechanism of tourmaline is analyzed systematically by hysteresis loop with monazite and other substances. The results indicate that monazite relies on its thorium element to generate radioactive energy to excite negative ions . It was discovered that the T/10%M/15%CeO 2 composites exhibited the optimum negative ion release performance of 6580 ions/cm 3 , which is approximately 5–6 times compared to tourmaline. The results of conductivity and hysteresis loop tests demonstrate that tourmaline stimulates negative oxygen ions due to its spontaneous polarization effect and the formation of a polarized electric field. The spontaneous polarization effect of tourmaline is positively correlated with the release amount of negative oxygen ions.
研究领域:
材料科学
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环境科学
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物理学
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Dewang Zeng,Yanzhi Li,Zhenwu Zhang,Chen Luo,Tong Liu,Qingfeng Kong,Rui Xiao
Oxygen-ion conduction is generally considered the rate-determining step during the chemical looping combustion process, which is vital for the design of the oxygen carriers. However, the redox reaction is heavily influenced by gas diffusion, making it very difficult to derive convincing intrinsic kinetic data. This work aims to establish a methodology to evaluate the intrinsic kinetics of oxygen carriers for chemical looping combustion by using an ultra-thin oxygen conducting membrane to exclude the influence of gas diffusion. From mass balance and Fick's second law, a mathematical kinetics model describing the intrinsic oxygen conduction performance was established. The intrinsic activation energy took value of 77.84 kJ/mol for pure Fe 2 O 3 . The kinetics parameters can be used for the high throughput design and screening of oxygen carriers.
研究领域:
材料科学
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化学工程
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高影响因子
Energy & Environmental Science
·
2025
·
IF 30.8
Weicheng Feng,Geng Zou,Tianfu Liu,Rongtan Li,Jingcheng Yu,Yige Guo,Qingxue Liu,Xiaomin Zhang,Junhu Wang,Na Ta,Mingrun Li,Peng Zhang,Xingzhong Cao,Runsheng Yu,Yuefeng Song,Meilin Liu,Guoxiong Wang,Xinhe Bao
While the effects of Sr segregation on the performance and stability of perovskite electrodes in solid oxide electrolysis cells (SOECs) have been widely studied, most attention has been focused on surface Sr segregates, with the impact of the resulting Sr deficiencies within the bulk phase of the electrodes largely ignored. Here, we report our findings from an investigation into the impact of Sr deficiencies in the SrCo0.7Fe0.3O3−δ (SCF) lattice and surface Sr segregates on the electrochemical behavior of well-controlled anode materials. Results demonstrate that Sr deficiencies in the perovskite lattice significantly enhance bulk oxygen ion transport, while surface Sr segregates suppress oxygen vacancy formation at interfaces, resulting in a reduced rate of oxygen exchange and lower surface electrical conductivity. Our study provides critical insights into the roles of bulk Sr deficiencies and surface Sr segregates, particularly their effects on oxygen vacancy formation, electrical conductivity, oxygen ion transport, and the overall rate of a high-temperature oxygen evolution reaction.
研究领域:
材料科学
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电化学
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高影响因子
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