CERAMICS INTERNATIONAL
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2025
·
IF 5.6
Wentao Huai,Xinyu Fu,Yifan Zhao,Zhenhao Cai,Saiwei Luan,Zhouyi Xu,Huizhan He,Jingxi Wang,Zhenxiao Fu,Xiuhua Cao,Lei Zhang,Rong Sun
Multilayer ceramic capacitors (MLCCs) are used in harsh environments such as automotive electronics, which require high reliability and temperature stability. Therefore, the regulation of Ho/Mg co-doping on the core-shell structure of BaTiO 3 -based MLCCs and the effect on temperature stability and reliability were investigated in this study. Ceramics and MLCCs device with various Ho/Mg molar ratios (1.2–1.8) were prepared using the solid-state reaction method. The study revealed the synergistic effects of Ho/Mg doping on shell concentration, shell thickness, and oxygen vacancy inhibition. The results showed that with the Ho/Mg molar ratio increase, the shell thickness increased from 27.98% to 62.24%. The temperature coefficient of capacitance (TCC) for the sample with Ho/Mg=1.8 satisfied the EIA-X7S (ΔC/C 25°C = ±22%, –55 °C to 125 °C) specification. X-ray photoelectron spectroscopy confirmed that Ho 3+ effectively captured oxygen vacancies by forming defect dipoles, while impedance spectroscopy demonstrated that the shell significantly inhibited carrier migration. Furthermore, the MLCCs device with Ho/Mg=1.8 exhibited a breakdown strength of 96.38 kV/mm and met the more stringent EIA-X7R (ΔC/C 25°C = ±15%, –55 °C to 125 °C) specification. These findings indicate that Ho/Mg co-doping effectively optimizes the core-shell structure, offering valuable theoretical guidance for developing MLCCs with enhanced temperature stability and reliability.
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高影响因子
FUEL PROCESSING TECHNOLOGY
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2025
·
IF 7.7
Yi Lin,Zaixing Wang,Lina Tang,Shi Jiang,Yu Guo,Xiaoqin Liu
Ni-based catalysts supported on composite metal oxides (NiO-Al 2 O 3 , MgO-Al 2 O 3 , Co 3 O 4 -Al 2 O 3 ) were synthesized via coprecipitation followed by Ni impregnation to investigate the influence of support composition on catalyst stability in methane steam reforming. Accelerated deactivation protocols (methane decomposition, high-temperature sintering, hydrothermal oxidation) revealed hydrothermal oxidation as the primary cause of irreversible deactivation. The 10Ni/NiAl catalyst (10 wt% Ni/10 wt% NiO-Al 2 O 3 ) showed remarkable regenerability after 923 K hydrothermal treatment, fully restoring its activity. This was attributed to coexisting reduced Ni species and readily reducible NiO, facilitating rapid reactivation. Other catalysts formed thermally stable NiAl 2 O 4 , leading to permanent deactivation. Methane cracking at 973 K had negligible effect, and 10Ni/NiAl catalyst exhibited the lowest carbon deposition (17.02 %). Under extreme hydrogen purged at 1223 K, only the 10Ni/CoAl catalyst exhibited a minor activity decline. The superior stability of 10Ni/NiAl was attributed to an in situ-formed NiAl composite metal oxides during 973 K calcination, which effectively anchored Ni particles, suppressed sintering, and prevented extensive oxidation.
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Materials Today Communications
·
2025
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IF 4.5
Xiaojing Liu,Chonghe Xu,Lin Wang,Rongchao Jiang,Liguang Yang,Wenyu Yang,Xuetao Yue
Ceramic fibers have emerged as a promising candidate for advanced thermal insulation applications due to their exceptional thermomechanical properties and chemical resistance. In this work, Mg(-Al/Zr)-Si ceramic fibers were successfully prepared via electrospinning technology using a dual-source precursor strategy, combining magnesium citrate complex and metal chlorides as metal oxides precursors. The crystalline phase formation, thermal decomposition behavior, microstructure, and properties of the fibers were systematically investigated using X-ray diffraction (XRD), thermogravimetric-differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FT–IR), and scanning electron microscopy (SEM). The heterogeneous sol precursor notably influenced the fiber crystallization process and facilitated more gradual thermal decomposition, as evidenced by reduced weight loss rates. Consequently, the Mg(-Al/Zr)-Si ceramic fibers maintained good structural integrity after exposure to 1200 °C. Moreover, the incorporation of aluminum or zirconium enhanced the tensile strengths of fibers (heat treated at 800 °C) to 1.56–1.79 MPa, representing a significant improvement over pure magnesium silicate fibers. Furthermore, the fibers exhibited good thermal insulation performance with low room-temperature thermal conductivity values ranging from 0.0282 to 0.0333 W·m −1 ·K −1 , further highlighting their suitability for high-temperature insulation applications. These findings underscore the significant potential of the developed fibers for use in high temperature thermal management and insulation systems.
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Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 4
·1-15
·
IF 4.3
Guo Yunyu,Wang Yiran,Shao Yuewen,Zhang Shu,Wang Yi,Hu Song,Xiang Jun,Hu Xun
During steam reforming, the performance of a catalyst and amount/property of coke are closely related to reaction intermediates reaching surface of a catalyst. Herein, modification of reaction intermediates by placing Mg-Al-hydrotalcite above Ni/KIT-6 catalyst in steam reforming of glycerol was conducted at 300 to 600 °C. The results revealed that the catalytic activity of Ni/KIT-6 in the lower bed was enhanced with either Mg 1 -Al 5 -hydrotalcite (containing more acidic sites) or Mg 5 -Al 1 -hydrotalcite (containing more alkaline sites) as upper-layer catalyst. The in situ infrared characterization of steam reforming demonstrated that Mg-Al-hydrotalcite catalyzed the deoxygenation of glycerol, facilitating the reforming of the partially deoxygenated intermediates over Ni/KIT-6. Mg-Al-hydrotalcite as protective catalyst, however, did not protect the Ni/KIT-6 from formation of more coke. Nonetheless, this did not lead to further deactivation of Ni/KIT-6 while Mg 5 -Al 1 -hydrotalcite even substantially enhanced the catalytic stability, even though the coke was much more significant than that in the use of single Ni/KIT-6 (52.7% vs. 28.6%). The reason beneath this was change of the property of coke from more aliphatic to more aromatic. Mg 5 -Al 1 -hydrotalcite catalyzed dehydration of glycerol, producing dominantly reaction intermediates bearing C=C, which formed the catalytic coke of with carbon nanotube as the main form with smooth outer walls as well as higher aromaticity, C/H ratio, crystallinity, crystal carbon size, thermal stability, and resistivity toward oxidation on Ni/KIT-6 in the lower bed. In comparison, the abundance of acidic sites on Mg 1 -Al 5 -hydrotalcite catalyzed the formation of more oxygen-containing species, leading to the formation of carbon nanotubes of rough surface on Ni/KIT-6.
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Journal of Energy Storage
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2024
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IF 8.9
Kehan Wang,Zhanglian Hong,Xiuquan Gu,Mingjia Zhi
The design of high-entropy O3-type layered oxides has been considered as an effective method for suppressing multiple phase transitions during cycling and improving stability. Herein, a series of high entropy layered oxides (HEOs) with different Mg:Sn ratios are investigated. It is found that the structural stability and electrochemical performance of these HEOs can be optimized by varying the Mg to Sn ratio. A lower Mg content is conducive to the formation of a single-phase HEO. An optimized HEO composition (namely NaNi 0.1 Co 0.2 Mn 0.2 Fe 0.2 Cu 0.1 Mg 0.04 Sn 0.16 O 2 ) exhibits high specific capacity (137.3 mAh g −1 at 0.1C) and good rate capability (~100 mAh g −1 at 1C). The cycling performance (capacity retention of ~87 % after 200 cycles at 0.5C) is also comparable to the reported O3-type HEOs. Such good performance can be attributed to its good redox activity, low interfacial impedance, higher Na + diffusion coefficient (2.26 × 10 −11 cm 2 s −1 ) and reversible O3-P3 phase transition.
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Chemical Engineering Journal Advances
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2026
·
IF 6.9
Wenbin Fan,Lizhi Jiang,Bingqing Yan,Huifang Li
Driven by surging global lithium demand, highly selective lithium separation from magnesium-rich brines is urgently required. This work systematically investigated the structure–performance relationship of four aryl-substituted phosphates (TOP, DPOP, IPPP, TPP). Moderate aryl substitution widened the coordination difference between Li + and Mg 2+ through electron-withdrawing effects, and DPOP exhibited the optimal balance of extraction capacity and selectivity. A ternary synergistic extraction system was fabricated with DPOP as the primary extractant, P204 to immobilize Fe 3+ , and eco-friendly diethyl succinate (DES) as a polar modifier. DES inhibited third-phase formation at DPOP contents of 10–50 vol.% and produced synergistic solvation via carbonyl groups. Under optimized conditions, the single-stage Li + extraction efficiency achieved ∼73%, and the Li/Mg separation factor reached 1630, nearly 80 times that of the traditional TBP–FeCl 3 system. Synergistic coordination of P204 and DES stabilized Fe 3+ in the organic phase, realizing quantitative lithium stripping with deionized water and avoiding concentrated acid and saponification. The organic phase maintained over 80% extraction efficiency after ten cycles. Slope analysis and FT-IR confirmed the extracted complex LiFeCl 4 •2DPOP•0.1DES. This work transforms DPOP into a sustainable, low-cost, closed loop industrial solution for lithium recovery from high Mg/Li brines.
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Catalysts
·
2026
·Vol. 16
·期 4
·312
·
IF 4.5
Xuelai Zhao,Wuyu Wang,Zhenjing Jiang,Xinghua Zhang,Xiuzheng Zhuang,Qi Zhang,Longlong Ma
The homogeneous nature of L-proline organocatalysts restricts their application in aldol condensation due to poor recyclability and stability. Herein, L-proline was heterogenized by ionic intercalation into Mg–Al layered double hydroxides (LDHs), yielding a series of proline-intercalated catalysts with tunable layer structures. Co-precipitation and memory-effect reconstruction strategies were employed to regulate interlayer spacing and proline loading. The resulting catalysts exhibited efficient performance in the aldol condensation of furfural with ketones under mild conditions. The reconstructed catalyst re-Mg4Al1P achieved a furfural conversion of 88.67% and a total product yield of 85.54% at room temperature, with product selectivity exceeding 95%. Structural characterizations confirmed that proline was stabilized within the LDH interlayers via R–COO—Mg electrostatic interaction while preserving the secondary amine active site. Mechanistic analysis indicated that the reaction proceeded through enamine- or enol-mediated pathways depending on water content, while the layered LDH framework imposed geometric confinement that suppressed side reactions. Catalyst deactivation in aqueous systems was mainly attributed to proline leaching rather than structural collapse.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2018
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IF 4.514
Zheng Su,Hua Wang,Xianzhu Ye,Konghu Tian,Weiqi Huang,Jing He,Yulan Guo,Xingyou Tian
In this work, we presented novel cycloaliphatic epoxy resin composites filled with multi-layer graphene (mG)/hexagonal boron nitride (h-BN) with high thermal conductivity and good electrical insulating. Firstly, the h-BN platelets were modified by mussel-inspired method with dopamine chemistry to obtain the modified filler h-BN@PDA. And the attachment of polydopamine molecule improved the interfacial adhesion between polymer matrix and filler. Secondly, the mG with fixed content was mixed with h-BN@PDA and then the hybrid filler mG/h-BN@PDA was added to the cycloaliphatic epoxy resin to obtain the polymer composites . Because of the high aspect of the filler, low viscosity of the polymer matrix , and assistance of the gravity force, the hybrid filler would stack alignment. It was found that the hybridization of the filler and alignment of the hybrid filler resulted in the enhancement of properties of the composites such as the thermal decomposition, mechanical (tensile strength = 5.50 MPa), thermal (through-plane ∼ 1.27 W/m K, in-plane ∼ 1.31 W/m K) and electrical insulating (electrical conductivity < 1.5 × 10 −10 S/cm) properties. The obtained composites could be applied in thermal management area.
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JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Xiubo Xie,Ming Chen,Peng Liu,Jiaxiang Shang,Tong Liu
Nickel sulfides decorated reduced graphene oxide (rGO) has been produced by co-reducing Ni 2+ and graphene oxide (GO), and is subsequently ball milled with Mg nanoparticles (NPs) produced by hydrogen plasma metal reaction (HPMR). The nickel sulfides of about 800 nm completely in situ change to MgS, Mg 2 Ni and Ni multiple catalysts after first hydrogenation/dehydrogenation process at 673 K. The Mg-5wt%NiS/rGO nanocomposite shows the highest hydrogen desorption kinetics and capacity properties, and the catalytic effect order of the additives is NiS/rGO, NiS and rGO. At 573 K, the Mg-NiS/rGO nanocomposite can quickly desorb 3.7 wt% H 2 in 10 min and 4.5 wt% H 2 in 60 min. The apparent hydrogen absorption and desorption activation energies of the Mg-5wt%NiS/rGO nanocomposite are decreased to 44.47 and 63.02 kJ mol −1 , smaller than those of the Mg-5wt%rGO and Mg-5wt%NiS samples. The best hydrogen desorption properties of the Mg-5wt%NiS/rGO nanocomposite can be explained by the synergistic catalytic effects of the highly dispersed MgS, Mg 2 Ni and Ni catalysts on the rGO sheets, and the more nucleation sites between the catalysts, rGO sheets and Mg matrix.
研究领域:
材料科学
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纳米科技
·
能源化学
·
催化化学
·
储氢材料
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Wenjing Zhang,Yun Wang,Hao Xu,Hui Zhang,Xiaoxia Lv,Xiaobo Pan
The development of high-performance aqueous zinc-ion batteries (AZIBs) is hindered by the intrinsic limitations of manganese-based cathodes, such as poor electronic conductivity and structural instability. Herein, we report a rational Mg²⁺/Al³⁺ co-doping strategy to engineer the properties of α-MnO₂. The optimized Mg₁Al₁@MnO₂ cathode exhibits a remarkable Zn²⁺ storage performance, delivering a high reversible capacity of 354 mAh g⁻¹ at 0.1 A g⁻¹ , exceptional rate capability, and outstanding cycling stability with 74.7% capacity retention after 1000 cycles at 2 A g⁻¹ . Comprehensive characterization reveals that the larger Mg²⁺ ions act as pillars to expand the (2 ×2) tunnels, while the similarly-sized Al³⁺ ions substitute for Mn⁴⁺ to reinforce the host framework. This synergistic modification induces a charge compensation effect, generating abundant oxygen vacancies and optimizing the Mn³⁺/Mn⁴⁺ ratio, which collectively enhance the intrinsic conductivity and ion diffusion kinetics. Furthermore, a highly reversible H⁺/Zn²⁺ co-(de)intercalation mechanism is confirmed. This work provides a generalizable design principle for developing durable cathode materials for advanced energy storage systems.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Tian Yuan,Pu Yang,Shiyu Lv,Kerong Fu,Qiuxian Zhang,Xia Yao,Yanli Luo,Feng Wang
A novel Mg-based defect-modified composite material (MOF-Mg(OH) 2 -HP) was prepared using MOF as a precursor, featuring a unique layered structure with abundant oxygen defects and delocalized electrons on its surface. • MOF-Mg(OH) 2 -HP can be activated by natural light, generating a large amount of reactive species through the “light-Fenton-like” pathway. Superoxide radicals (·O 2 − ) and holes (h + ) are the primary reactive species, which simultaneously oxidize non-reactive organophosphorus compounds and recover orthophosphate (achieving a 100% phosphorus removal rate within 90 min). • It demonstrates exceptional multifunctionality in actual aquaculture wastewater, effectively eliminating 92.84% of Escherichia coli and 98.69% of Chlorella pyrenoidosa , providing a green synergistic solution for integrated water purification and resource recovery strategies. The low-cost and harmless treatment of dairy wastewater is a focal point in agricultural development today. This study innovatively utilizes hydrogen peroxide to modify Mg-MOF-derived oxides, preparing a series of hydrogen peroxide-modified composite materials rich in defects. For the first time, an integrally formed composite material consisting of Mg(OH) 2 with O 2 2− on the outside and MgO on the inside is synthesized. Compared to modified materials prepared using commercially available MgO as the raw material, this material possesses unique Mg(OH) 2 /MgO heterojunctions, a larger specific surface area, abundant oxygen defects, and higher active oxygen content. Starting from the current issues of poor universality, high energy consumption, and difficulties in simultaneous harmless treatment of wastewater in organic phosphorus oxidation materials, we designed an efficient degradation of various organic phosphorus compounds and resource recovery of orthophosphorus using sunlight. This is mainly achieved through the synergistic effect of surface O 2 2− hydrolysis (Fenton-like pathway) and the generation of oxidizing active species through photoexcitation at oxygen vacancies (photocatalytic pathway), resulting in efficient degradation of organic phosphorus and simultaneous recovery (with a removal rate of 100% in 90 min).This material is the first to demonstrate the ability to simultaneously kill 92.84% of Escherichia coli and 98.69% of Chlorella pyrenoidosa during phosphorus removal, proposing a novel collaborative solution for green recovery and harmless treatment of pollutants. Download: Download high-res image (163KB) Download: Download full-size image
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Jiaru Wei,Beichen Sun,Wenbiao Ma,Fengfeng Gao,Xiaowei An,Xiao Du,Xiaogang Hao
Spinel LiMn 2 O 4 is a promising electrode for electrochemically switched ion exchange (ESIX) lithium extraction, but its sluggish solid-phase diffusion and severe Mn dissolution limit its application in high-Mg 2+ /Li + salt lake brines. Herein, we report a clear size effect that regulates Li + intercalation kinetics and Mg 2+ /Li + separation by comparing hydrothermally synthesized nano-sized N-LiMn 2 O 4 (20–100 nm) and commercial micron-sized LiMn 2 O 4 (∼10 μm). Nanosizing induces preferential exposure of thermodynamically stable (111) facets, effectively suppressing surface reconstruction and Mn dissolution. In-situ distribution of relaxation time (DRT) reveals that the rate-limiting step changes from pure solid-phase diffusion in micron LiMn 2 O 4 to surface-diffusion co-control in N-LiMn 2 O 4 , reducing solid-phase diffusion resistance by 75% and charge-transfer resistance by 78.6%. Benefiting from kinetic optimization, the N-LiMn 2 O 4 /C/PVDF electrode maintains a Li + /Mg 2+ separation factor > 100 even at an ultrahigh Mg 2+ /Li + ratio of 500, far exceeding the micron counterpart. After optimization (wet film thickness = 200 μm, adsorption potential = 1.0 V), the electrode retains >90% capacity after 10 cycles in 200 mg·L −1 LiCl solution. This work clarifies the size-dependent kinetic transition mechanism and provides a rational design strategy for high-selectivity electrodes toward efficient lithium extraction from high-Mg/Li brines.
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危险品化学品经营许可证（带存储）