JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 12
·3315-3324
·
IF 2.5
Kuang Juner,Li Xiang,Li Yisa,Zhong Yu,Gu Changdong,Xia Xinhui,Wang Xiuli,Tu Jiangping
Polyethylene oxide (PEO)-based solid electrolytes, which exhibit ideal extensibility and wide electrochemical window, are considered as one of the most promising candidates for all solid-state sodium batteries (ASSSBs). However, the low mechanical strength and low ionic conductivity hinder their application. Herein, electrospun MgAl 2 O 4 nanofibers are complexed with PEO/NaClO 4 to enhance the mechanical and thermal stability. Determined by 23 Na solid-state nuclear magnetic resonance spectroscopy combined with first-principle calculations, the adsorption energy of ClO 4 − on the MgAl 2 O 4 surface is far higher than that on PEO, which facilitates the dissociation of Na + and ClO 4 − , thereby enabling a fast transport of Na + by the introduction of MgAl 2 O 4 in the polymer electrolyte. The ionic conductivity is enhanced to 1.89 × 10 −4 S cm −1 from 8.46 × 10 −5 S cm −1 at 55 °C, and the Na + transfer number is improved to 0.55 from 0.26 in the composite electrolyte. The Na//(PEO/MgAl 2 O 4 /NaClO 4 )//Na symmetric cell can cycle for over 400 h at a current density of 0.05 mA cm −2 and a cut-off capacity of 0.05 mAh cm −2 while the ASSSBs incorporating the polymer composite electrolyte also exhibit notable rate and cycle performances.
研究领域:
材料科学
·
能源化学
·
纳米技术
·
电化学
·
高分子科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yifan Yang,Mengyao Yang,Zhaohui Huang,Jizeng Zhao,Wei Zhao,Ding'ao Yang,Lin Ren,Xiantang Zhao,Hao Yan,Lei Liu,Lei Gong
With the increasing severity in the service environment of secondary refining furnaces, traditional refractories cannot meet the high requirements. MgO-based fired refractories are subject to the thermal shock effect and slag penetration which are detrimental to their performance. In this study, low-carbon MgO-based refractories are reinforced by an in-situ MgAl 2 O 4 (MA)-TiO 2 dense layer with the addition of low-cost self-prepared titanium carbonitride [Ti(C, N)]. The influence of the addition of as-prepared Ti(C, N) on the properties of low-carbon MgO-based refractories was investigated. The reinforced refractories had no cracks after 190 thermal shock cycles, demonstrating the highest hot modulus of rupture (HMOR) with excellent thermal shock resistance (TSR). After 2.5 h of rotary immersion in a steel slag, the corrosion depth of the composites was only 26.3% of that of commercial MgO-CaO refractories. Based on the thermodynamic analysis, the Ti(C, N) reinforcement mechanism for the low-carbon MgO-based refractories was studied. A MA-TiO 2 dense layer formed during the oxidation process of the composites which enhanced the oxidation resistance . The volume expansion caused by the partial oxidation of Ti(C, N) prevents the penetration of the molten slag to refractories and Ti(C, N) powders forming a protective layer to further effectively protect the composites from slag corrosion owing to its high surface area. In addition, 3CaO·2TiO 2 formed by the reaction between the steel slag and Ti(C, N) further increased the slag corrosion resistance (SCR) of the composites. This research offers a new idea for the material selection for secondary refining furnaces to achieve a green and effective steel-making production route and enriches the understanding of the phase behaviour in the Mg-Al-Ti-C-O-N system under high temperatures.
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
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Jian Qiao,Yubin Wen
Porous ceramic materials have been broadly applied in various fields due to their multifunctional properties. Optimization of their microstructural characteristics, such as pore morphology, total porosity, and pore size distribution , which determine various properties of the final products, is crucial to improve their performances and thus extend their applications. In this study, single-phase porous MgAl 2 O 4 materials were fabricated by direct foaming–gelcasting. With an increase in the foam volume from 260 to 350 mL, the total porosity and pore size of the porous ceramic increased, and its microstructure varied from mostly closed cells to open cells containing interconnected large pores (40–155 μm) and small circular windows (10–40 μm) in the ceramic skeleton. The total porosity could be tailored from 84.91% to 76.08% by modulating the sintering temperature and foam volume and the corresponding compressive strengths were in the range of 2.8–15.0 MPa. The compressive strength exhibited a power-law relationship with the relative density with indices of approximately 3.409 and 3.439, respectively. Porous MgAl 2 O 4 ceramics exhibited low dielectric constants in the range of 1.618–1.910 at room temperature, which are well matched with theoretical calculations on account of a modified Bruggeman model. The porous MgAl 2 O 4 ceramics with good mechanical and dielectric properties controlled easily by various sintering temperatures and foam volumes are promising for practical applications.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 7
·428
·
IF 3.8
Weiying Wang,Changlin Chen
Tetrahydrofurfuryl alcohol, a cost-effective biomass derivative, offers a sustainable path for synthesizing 1,5-pentanediol through hydrogenolysis. To develop the efficient production of 1,5-pentanediol from this alcohol, we have prepared a series of MgAl2O4-modified Pt/WOx/γ-Al2O3catalysts with varying compositions via impregnation–calcination methods. The physicochemical properties of these catalysts were subsequently characterized using diverse techniques. Characterization revealed that magnesia–alumina spinel modification enhanced Pt particle dispersion, CO adsorption on Pt/WOx/γ-Al2O3, reduced Pt particle reduction temperature, diminished the acid content in the catalysts, and increased the surface oxygen vacancy concentration. These alterations appear to influence the catalyst performance, though other factors cannot be ruled out. Catalytic activity tests demonstrated that magnesia–alumina spinel modification improved tetrahydrofurfuryl alcohol hydrogenolysis activity and the 1,5-pentanediol selectivity of Pt/WOx/γ-Al2O3. Optimal performance was achieved at 12% magnesia–alumina spinel loading, with a tetrahydrofurfuryl alcohol conversion of 47.3% and 1,5-pentanediol selectivity of 88.4%.
研究领域:
化学工程
·
催化科学
·
生物质转化
✓ 已验证
产品关联
DOI
高影响因子
InfoMat
·
2025
·
IF 22.3
Gaochao Liu,Zhan Xiong,Weibin Chen,Shuai Zhang,Yuzhen Wang,Zhiguo Xia
High-power broadband near-infrared (NIR) light sources have attracted extensive interest toward emerging non-invasive imaging and detection applications. However, exploring highly stable luminescent materials with targeted broadband NIR emission remains a great challenge. Here, MgAl 2 O 4 :Cr 3+ translucent ceramics have been designed and fabricated by a spark plasma sintering method, and a giant redshift of the emission band occurs from 686 to 928 nm due to the decreasing local structural symmetry around the isolated Cr 3+ ions induced by the abundant cation vacancies. As Cr 3+ content increases, MgAl 2 O 4 :6%Cr 3+ ceramic realizes the optimized external quantum efficiency of 73% with broadband NIR emission centered at 890 nm and a full-width at half-maximum of 315 nm under 450 nm excitation. The next-generation laser-driven light source containing NIR ceramic provides an output power exceeding 2 W and a light conversion efficiency of 22% when pumped with a blue laser of 10 W·mm −2 . The proof-of-concept demonstrations in imaging and detection reveal the advantages of high-power and high-efficiency laser-driven broadband NIR light sources and promote future development in the chemical design of NIR emitters.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
PHYSICS AND CHEMISTRY OF MINERALS
·
2026
·Vol. 53
·期 1
·2
·
IF 1.6
He Jinze,Liu Zhaodong,Ishii Takayuki
An alumina-rich silicate phase of calcium ferrite-type (CF) phase is a major mineral in crustal rocks subducted into the lower mantle. However, its chemical composition with increasing pressure and temperature remains unclear yet. In this study, phase relations in the CaAl 2 O 4 -MgAl 2 O 4 system were determined at 15–25 GPa and 1100–2000 °C by using a multi-anvil apparatus. In the pressure-temperature range, CaAl 2 O 4 -rich CF phase coexisted with another alumina-rich silicate of hexagonal (NAL) phase in the (1-x)CaAl 2 O 4 -xMgAl 2 O 4 system (x = 5–70 mol%). The solubility of the MgAl 2 O 4 component in the CF phase increases with pressure and temperature, from 3.8 mol% to 23.9 mol%, while the composition of the NAL phase was almost constant. In the MgAl 2 O 4 -rich system, we found that almost no CaO was incorporated into MgAl 2 O 4 phases in the present pressure-temperature range. MgAl 2 O 4 spinel (Sp) transformed to decomposition phases of periclase (Per) or Mg 2 Al 2 O 5 (mLd) phase and corundum (Crn), and then the CF phase formed at higher pressures, showing phase assemblages of NAL + Sp, NAL + Crn + Per or mLd, and NAL + CF with increasing pressure. An additional experiment in the NaAlSiO 4 -CaAl 2 O 4 system at 20 GPa and 1400 °C showed both Na- and Ca-rich CF phases incorporated Ca 2+ and Na + , respectively. These results together with previously determined phase relations in NaAlSiO 4 -MgAl 2 O 4 can explain limited CaO contents of CF phases in crustal materials subducted into the lower mantle. In addition, pressure-temperature changes in the MgAl 2 O 4 solubility of CF-type CaAl 2 O 4 can be used as a new pressure calibrant in the multi-anvil experiments.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 50
·期 5
·7346-7354
·
IF 5.2
Songtong Xuan,Xiangchen Kong,Jianying Hao,Xiaojun Wang,Yuming Tian
MgO–MgAl 2 O 4 composites are arising as promising candidates for high-temperature industrial applications. For this reason, the in-situ synthesis of such types of composites with spinel structure has attracted the attention of the scientific community. Along these lines, in this work, magnesia and bauxite were used as raw materials to fabricate MgAl 2 O 4 composites. The mass proportion in the composites was also adjusted by using the solid-phase sintering method at 1400–1650 °C to enhance its mechanical properties and densification. XPS and SEM measurements were conducted, indicating that the MA50 sample with the mass ratio of 50:100 (MgAl 2 O 4 :MgO + MgAl 2 O 4 ) exhibited the best properties at 1550 °C, in terms of uniformity of the grains’ growth morphology, optimal densification of the matrix structure, and achieving a maximum flexural strength of 113.23 MPa. From our analysis, it was demonstrated that the non-equivalent displacement of Al 3+ and Mg 2+ could easily lead to the formation of the (Mg 1-x Al x/2 )Mg x/4 O solid-solution during the similar crystal structure, which enhanced mechanical strengthening between the micro-grain and framework. Meanwhile, the existence of a certain liquid phase not only effectively increased the mass transfer during the processing of interdiffusion between Al 3+ and Mg 2+ , but also promoted the distribution of crystallite and microstructure.
研究领域:
材料科学
·
陶瓷
·
高温材料
·
材料力学性能
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 8.2
Yanan Li,Xiang-Xiang Pan,Hui-Yu Zhang,Wan-Ming Li,Changqing Liu,Cheng-Xin Li
Development of a highly conductive interlayer with good multilayer interfacial compatibility is critical for achieving high-performance inert ceramic-supported flat-tubular segmented-in-series solid oxide fuel cells (FT-SIS-SOFCs). In this study, a high-performance MgO-MgAl2O4 (MMA)-supported solid oxide fuel cell is prepared by developing an innovative 70 vol % NiO-30 vol % MgAl2O4 interlayer via a cosintering process. The NiO-MgAl2O4 interlayer effectively suppresses MgO diffusion from the MMA substrate, limiting the diffusion distance to 25 μm. Additionally, the conductivity of the fabricated interlayer exceeds 3400 S cm–1 at the operational temperature. It exhibits excellent cosintering compatibility with the other functional layers. When the thickness of the NiO-MgAl2O4 interlayer is approximately 40 μm, the MMA-supported SOFC single cell shows an open circuit voltage (OCV) of about 1.07 V and a power density of 760 mW cm–2 at 850 °C, as well as excellent long-term stability. Moreover, the 16-cell FT-SIS-SOFCs show an OCV and maximum output power at 850 °C of 17 V and 15 W, respectively.
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Songtong Xuan,Yuming Tian,Xiangchen Kong,Jianying Hao,Xiaojun Wang
The tuning of the properties of MgAl 2 O 4 -based materials has aroused great attention in the field of engineering technology. Along these lines, magnesia and alumina were used as raw materials to prepare spinel by the solid-phase sintering method at 1500–1600 °C. Particularly, the impacts of the different MgO/Al 2 O 3 molar ratios on the microstructural densification, sintering process and mechanical property of the fabricated materials were systematically studied. The results showed that the stoichiometric spinel with the highest concentration of ion diffusion possessed the best densification. And the magnesium-rich spinel displayed the better densification following with the formation of solid-solution, while the aluminum-rich spinel exhibited the worst ability in forming the solid-solution. Moreover, the different molar ratios changed the microstructure of the spinel, which induced the optimal sintering temperature of stoichiometric spinel to be at least 50 °C below that of the others. Specifically, in stoichiometric spinel, spinel grains grew up and formed obvious structure, which made the sintering process arrive at the end point and made the performance reach the best. Specifically, the flexural strength was 112.62 MPa and apparent porosity was 0.44%. However, no grown or developed spinel grains were observed for magnesium-rich/aluminum-rich spinels, which delayed the sintering process.
研究领域:
材料科学
·
无机非金属材料
·
陶瓷工艺学
·
固态化学
·
结构陶瓷
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 133
·期 1
·55-71
·
IF 2.081
Yu Jun,Liang Jiezhen,Chen Xiaopeng,Wang Linlin,Wei Xiaojie,Qin Yanmin,Li Youqi,Ling Youkang
The reaction pathway and kinetics of cellulose hydrogenolysis to ethylene glycol (EG) catalyzed by nickel and tungsten combined with copper supported on magnesium aluminum spinel (NiO x -WO y -Cu/MgAl 2 O 4 ) were studied. Cellulose was hydrolyzed to glucose, which followed either the retro-aldol condensation to glycolaldehyde and erythrose or isomerized to fructose followed by retro-aldol reaction to dihydroxyacetone and glyceraldehydes. The derived glucose can also be hydrogenated to sorbitol. The intermediate products were subsequently converted to EG, erythritol, glycerol and 1,2-propanediol. The cellulose conversion, yields of EG and C 2,3 polyols were achieved 100, 53.1 and 62.7%, respectively. The simplified kinetic models were proposed and validated with the experimental results, indicating that the simpler first-order model could perfectly describe the hydrogenolysis of cellulose in the catalytic system. Hydrolysis of cellulose was demonstrated as the rate determining step independent of the reaction pathway, and high temperatures were favorable to the hydrolysis of cellulose to glucose. Activation energies results showed that high temperatures were favorable to the hydrolysis of cellulose to glucose.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Kai Shi,Yang Deng,Xia An,Xu Wu,Xianmei Xie
This work focused on optimizing the synergistic effect between CeO 2 and Ni in CeO 2 modified Ni/MgAl 2 O 4 . Six catalysts for ethanol steam reforming (ESR), including NiCeMgAl, CeO 2 /NiMgAl, Ni/CeMgAl, Ni-CeO 2 /MgAl 2 O 4 , Ni/CeO 2 /MgAl 2 O 4 and CeO 2 /Ni/MgAl 2 O 4 , were synthesized by sol–gel and/or impregnation methods, which controlled the introduction order of Ce(NO 3 ) 3 . Ni/CeMgAl showed a satisfactory stability with 90.6 % of ethanol conversion after 100 h test, 66.9 % of H 2 concentration in product, and an excellent anti-coking ability with 0.72 mg c /(g cat ·h). The optimal catalytic performance of Ni/CeMgAl benefits from the unique distribution of components, which provides adequate Ni 0 active sites for C-C bonds scission, maintains a stable particle size of metallic Ni, and suppresses the side reactions and carbonization of intermediates on CeO 2 sites. This work illuminates the important of coordinating the ability of Ni and CeO 2 for ESR and presents a new insight into the design of low-cost and high-performance catalysts in practical applications.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Jun Yu,Jiezhen Liang,Xiaopeng Chen,Linlin Wang,Xiaojie Wei,Youqi Li,Yanmin Qin
Nickel and tungsten, combined with copper, were incorporated into a magnesium aluminum spinel to form a multifunctional catalyst (Ni–W–Cu/MgAl2O4). Characterization results suggested that the adjacent Cu not only facilitated the reduction of W6+ to W5+ with substantial oxygen vacancies but also promoted the reducibility of the Ni species. Besides, the incorporation of Ni, W, and Cu into the support enhanced the catalytic acidity, as well as the L acid sites. The catalyst exhibited a strong synergistic effect between the three metals and the support, resulting in higher catalytic activity for the one-pot hydrogenolysis of cellulose to ethylene glycol. High cellulose conversion (100%) and ethylene glycol yield (52.8%) were obtained, even under a low H2 pressure of 3 MPa.
研究领域:
催化化学
·
可再生能源
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）