CERAMICS INTERNATIONAL
·
2026
·
IF 6
Baoyong Huang,Xiuyun Zhang,Jianwei Song,Yijie Zeng,Yuyang Tang,Yiqi Sang,Yunyun Zhao,Guisheng Zhu,Laijun liu,Huarui Xu
The microstructure engineering of BaTiO 3 -based ceramic systems serves as an essential prerequisite to attain superior dielectric stability and reliability in modern multilayer ceramic capacitors (MLCCs). In this study, the effects of Ca doping on phase composition, microstructure, defect evolution, and dielectric temperature stability were systematically investigated in a novel BaTiO 3 -1 at%CeO 2 -3 at%MgO- x at%CaCO 3 ( x = 0, 2, 4, 6, 8) ceramic system. The results show that Ca doping promotes the tetragonality of the structure to increase first and then decrease. The addition of Ca 2+ changed the original defect composition of the ceramics: Ca 2+ promotes the conversion of Ce 3+ to Ce 4+ , reduces the reduction of Ti 4+ , and regulates the concentration of oxygen vacancies. The addition of Ca 2+ reduces the grain boundary activation energy ( 1.86 eV to 1.33 eV ), and reduces the carrier concentration to improve the ceramic resistivity. Ca 2+ promotes the enrichment of doped ions at the grain boundary to form a ' core-shell ' structure, which is characterized by broadened and suppressed dielectric peaks. When x = 6 at %, the ceramics meet the X8R specification (|( C T - C 25°C )/ C 25°C ×100%| ≤ 15%, T ∈ [-55°C, 150°C]), the dielectric constant at room temperature is 2802, and the dielectric loss is less than 0.02. This study reveals the Ca 2+ induced multi-ion synergistic regulation mechanism, which provides an experimental basis for the development of high stability and low loss lead-free MLCC dielectric materials that meet the X8R standard.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Yulong Li,Zhijie Xie,Hai-Wen Li,Yongtao Li
Magnesium-based hydrides offer high hydrogen capacity but are often limited by sluggish sorption kinetics and high thermodynamic stability. Herein, transition metal-mediated reactive ball milling (RBM) was adopted to prepare Mg nanograins, with the synergistic size and strain effects for improving kinetics and thermodynamics. Mn, Ti, and Zr were evaluated as milling additives under identical RBM conditions. Mn induces the most pronounced grain refinement where the obtained Mg nanograins exhibit an estimated average characteristic size of ∼45 nm uniformly dispersed within a Mn matrix. The optimized Mg 0.25 Mn 0.75 composites show a better dehydrogenation with onset temperature of 170 °C, accompanied by an apparent activation energy of 110.25 kJ mol −1 and a desorption enthalpy of 73.40 kJ mol −1 H 2 . It reaches a Mg-normalized H 2 absorption capacity of 5.97 wt% at 25 °C and 4.0 MPa in just 11 min, with maintaining capacity of 93% after 50 cycles.
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Results in Engineering
·
2026
·
IF 9.4
Wenbin Fan,Lizhi Jiang,Bingqing Yan,Dahuan Liu,Huifang Li
Salt lake brines, key lithium resources, face challenges in efficient lithium extraction due to high Mg/Li ratios. This study investigated six organophosphorus extractants (OPEs) across neutral and acidic types. Using simulated high Mg/Li brines, it first proposed a "dual-site synergistic coordination model" to clarify how OPEs’ molecular structure, acidity, and coordination mode regulate lithium selectivity. Neutral OPEs (TOP>TIBP>TBP) outperformed acidic ones in extraction efficiency/selectivity by forming stable [LiLn]+[FeCl4]- complexes, while acidic OPEs showed poor performance due to Fe³⁺ chelation and H⁺/Mg²⁺ exchange. TOP enhanced Li⁺ selectivity by 20% vs TBP. This work establishes structure-acidity-performance correlations, guiding commercial extractant optimization and addressing high Mg/Li bottlenecks.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Yunhui Li,Zuoying Cao,Xiwen Zhang,Jialin Qing,Mingyu Wang,Qinggang Li,Shengxi Wu,Xinsheng Wu,Wenjuan Guan,Guiqing Zhang
Efficient recovery of nickel, cobalt, and manganese from Ca- and Mg-rich sulfate leachates is essential for battery-grade precursor production. A synergistic solvent extraction (SSX) system combining N,N-bis(4-thiazolylmethyl)octylamine (NNBT) with acidic organophosphorus extractants was developed to achieve coextraction of Ni, Co, and Mn. Among various combinations, the D2EHPA–NNBT system exhibited the highest selectivity and cost efficiency, enabling complete extraction of Ni, Co, and Mn while suppressing Ca and Mg transfer. Multistage countercurrent and scrubbing operations further reduced impurities, producing high-purity Ni–Co–Mn sulfate solutions suitable for battery applications. Thermodynamic and spectroscopic analyses confirmed that synergism originated from selective coordination and cation-exchange interactions. This study demonstrates a practical and scalable route for selective Ni–Co–Mn recovery from impurity-rich sulfate solutions, contributing to the efficient and sustainable hydrometallurgical processing of battery metals.
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ACS Applied Materials & Interfaces
·
2026
·Vol. 18
·期 30
·40660-40671
·
IF 7.8
Jin Zhao,Yao Shunyu,Sun Chang,Zhang Chunqi,Liang Licheng,Liu Yipeng,Yang Qingqing,Liang Fei
The practical deployment of magnesium-based alloys, despite their attractive hydrogen-storage capacity and economical advantage, faces critical barriers in the form of high dehydrogenation temperatures and inadequate sorption kinetics. To overcome these barriers, a two-dimensional layered La x @Ti 3 C 2 -derived catalyst was therefore developed, which exhibits high catalytic activity toward the Mg-4Ni-2Y alloy. The Mg-4Ni-2Y + 10 wt % La 0.2 @Ti 3 C 2 composite not only lowered the onset absorption/desorption temperatures to 23.3 ° C and 265.5 ° C but also enabled the composite to achieve superior sorption kinetics, absorbing 4.80 wt % H 2 in 1 min at 150 ° C and releasing 5.16 wt % H 2 in 4 min at 350 ° C. Furthermore, the apparent activation energy (E a ) was substantially reduced to 85.22 ± 2.38 kJ/mol for the composite, thereby decreasing the dehydrogenation temperature and accelerating the kinetics. Systematic analysis suggests that the catalytic enhancement is primarily associated with highly dispersed Ti 0 species, which are proposed to act as the primary active sites for hydrogen dissociation and recombination. La decoration is suggested to serve as an electronic promoter, modulating the electronic structure of Ti sites and stabilizing the interfacial environment. This synergistic Ti-La interaction facilitates hydrogen activation and interfacial transfer without altering the intrinsic Mg/MgH 2 thermodynamics, thereby significantly accelerating hydrogen sorption kinetics.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Yang Bao,YunJia Ling,ZeYing Ji,Hongru Zhou,Shaoxian Song,Feifei Jia,Jianbo Li,Mildred Quintana
In this study, the incorporation of Mg2+ induced the transformation of MnO2 from the original cubic [MnO6] octahedron to a flattened conformation (FLA-MnO2). The flattened conformation mitigated structural deformation of the [Mn3+·O6] octahedron by inhibiting the J–T aberration during the reduction process of Mn4+, thereby improving the selective adsorption capacity of lithium. When used in hybrid capacitive deionization (HCDI), FLA-MnO2 exhibited a high Li+ adsorption capacity of 30.14 mg g−1 in 32.74 mg L−1 Li+ ion solution, with low energy consumption of 0.45 Wh g−1. Notably, the FLA-MnO2‖AC HCDI cell exhibited high stability, maintaining 82% of its capacity over 100 cycles. This was evidenced by the 82% capacity retention and low Mn loss (1.3%) over 100 cycles. Finally, the excellent selective extraction performance of Li+ ions was demonstrated in Lop Nor, the low-grade original brine of the XieLi salt flats. The calculated separation factors for Li+/Na+, Li+/K+, Li+/Ca2+, and Li+/Mg2+ reached impressive values of 4.37, 3.75, 3.24, and 2.11, respectively, making the Lop Nor a candidate electrode for lithium extraction from low-grade raw brines.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Zheyu Zhang,Yuxiao Jia,Nuo Lei,Fei Chu,Liuhui Zhu,Mengdan Yu,Lixin Chen,Xuezhang Xiao
Developing a strategy for efficiently synthesizing borohydrides with high capacity and favorable reversibility is significant for promoting the development of next-generation energy materials. This work proposes a novel Mg(BH 4 ) 2 –TiNbNiCuO@graphene (Mg(BH 4 ) 2 –TiNbNiCuO@GR) high-entropy system, integrating nanoconfinement and catalytic strategies to significantly enhance the dehydrogenation kinetics and cycling stability of Mg(BH 4 ) 2 . TiNbNiCuO medium-entropy oxide (MEO) were synthesized in situ on a graphene carbon skeleton as catalyst (TiNbNiCuO@GR). Subsequently, Mg(BH 4 ) 2 was slowly infiltrated into the TiNbNiCuO@GR framework, which served as a carrier for nanoconfined Mg(BH 4 ) 2 , forming the Mg(BH 4 ) 2 –TiNbNiCuO@GR. It is demonstrated that the close contact between nanoconfined TiNbNiCuO MEO and Mg(BH 4 ) 2 creates abundant active sites, which facilitates electron transfer to improve dehydrogenation kinetics (dehydrogenation onset temperature at 63.5 °C) with a high capacity of 9.8 wt% H 2 . Notably, high-entropy effect and nanoconfinement boost the structure stability of TiNbNiCuO and prevent the agglomeration of Mg(BH 4 ) 2 , respectively, thereby jointly achieving an enhanced reversibility of the dehydrogenation kinetics, enabling a capacity retention of 81.5% after 10 cycles. The synergistic nanoconfinement-catalytic effect within the Mg(BH 4 ) 2 –TiNbNiCuO@GR offers new insights into the efficient dehydrogenation pathway of Mg-based borohydride systems.
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高影响因子
Applied Materials Today
·
2026
·
IF 6.9
Jingguang Wang,Zhenze Xie,Nantian Duan,Tao Wang,Chang Du
Repairing critical-sized bone defects, particularly those with irregular geometries, remains a significant clinical challenge. Stem cell-derived exosomes have been shown to promote bone defect repair. However, effective encapsulation and delivery of exosomes are still not well solved. To address this, we developed a composite bioink by encapsulating exosomes within a Pickering emulsion system (Water in oil. Water phase: MgO/exosomes; Oil phase: hydroxyapatite/silica/Poly (D, L-lactide-co-trimethylene carbonate)). This bioink was used to fabricate an exosome-laden MgO composite scaffold (PHS/MgO-EXO) via 3D printing. The PHS/MgO-EXO scaffold featured an excellent hierarchical interconnecting porous structure, capable of sustained release of Mg²⁺ ions and exosomes, which collectively promoted cell proliferation, adhesion, and osteogenic differentiation. Notably, the scaffold exhibited an excellent shape memory effect, enabling it to achieve conformal fitting and repair of irregular defects upon external stimulation. Moreover, the PHS/MgO-EXO scaffold could promote the repair and regeneration of bone defect in rat skull defect experiment. Transcriptome analyses revealed the mechanism: the PHS/MgO-EXO scaffold regulated the osteogenic differentiation of mBMSCs through the Hippo signaling pathways, and promoted tissue regeneration by modulating the immune response through the TNF-α and IL-17 pathways. Taken together, this PHS/MgO-EXO scaffold with shape memory properties can release exosomes and sustain the release of Mg²⁺ ions, which will provide a highly promising strategy for clinical repair of irregular bone defects.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 24
·52228-52239
·
IF 5.1
Dongjiang Wu,Weijie Lv,Zheng Li,Xuexin Yu,Cong Zhou,Bi Zhang,Wei Wang,Huanyue Zhang,Guangyi Ma,Fangyong Niu
High-entropy oxides (HEOs) have attracted extensive research interest due to their unique structural features, customizable elemental compositions, and tunable functional properties. Nevertheless, the complexity, low efficiency, and high cost of the existing HEO synthesis methods place limitations on them. In this study, Laser directed energy deposition (LDED) was employed to synthesize (Mg, Co, Ni, Cu, Zn)O oxides. Additionally, the novelty of applying the LDED process to multicationic systems was emphasized. The comparison between specimens fabricated from mixed powder via LDED(MP) and those fabricated from pre-sintered powder via LDED(SP) encompasses macroscopic morphology, microstructure, and performance. The results showed that SP significantly enhanced the density from 86.44 % to 96.70 % compared to MP. The macro-segregation of Cu and Cu 2 O in the phase composition was observed in MP and SP. High-temperature pre-sintering promoted the solid solution formation of Co and Ni during LDED, leading to more severe micro-segregation of Co and Ni. When employed as anodes in lithium-ion batteries, MP and SP have outstanding long-term cycle stability, according to electrochemical performance studies. At a current density of 100 mAg −1 , these specimens maintained a capacity retention rate of 100 % even after 200 cycles. The initial discharge capacities of MP and SP were respectively 477.73 mAh g −1 and 373.86 mAh g −1 . This study is expected to present a novel approach for the rapid synthesis of (Mg, Co, Ni, Cu, Zn)O oxide ceramics .
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Kaibin Li,Jie Li,Ning Zhang,Xiaolong Gu,Ying Tang,Liang Fang
High-entropy Mg(Mg 0.25 Zn 0.25 Ga 0.5 Ti 0.5 Al 0.5 )O 4 ceramics with disordered spinel structure were prepared at 1420-1500 °C. When sintered at 1480 °C, Mg(Mg 0.25 Zn 0.25 Ga 0.5 Ti 0.5 Al 0.5 )O 4 ceramics exhibited extremely high Q×f of 105,800 ± 300 GHz, improved τ f of –45.3 ± 0.01 ppm/°C, and low ε r of 11.5 ± 0.1, with favorable H v and flexural strength of 11.43 ± 0.01 GPa and 128.1 ± 0.1 MPa, respectively, which were 23.3% and 31.7% higher than those of MgAl 2 O 4 . The measured ε r of Mg(Mg 0.25 Zn 0.25 Ga 0.5 Ti 0.5 Al 0.5 )O 4 ceramics was substantially higher than the calculated εᵣ (C-M) (9.9), due to the underestimated Ti 4+ polarizability and rattling effect. The improved τ f was caused by the decreased τ ε and increased Gibbs free energy. The 1.5 times increase in Q × f stemmed from the increased packing fraction and lattice energy, lowered σ AC , enhanced E a and covalency factor. A cylindrical dielectric resonator antenna was designed with Mg(Mg 0.25 Zn 0.25 Ga 0.5 Ti 0.5 Al 0.5 )O 4 high-entropy ceramic, which can fulfill the communication demands of high-frequency and high-power applications.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 6
·125033
·
IF 7.5
Rui Li,Xinyi Wang,Ying Gao,Yongchao Liu,Li Li,Shiliu Yang,Min Guo
Fe/Mg co-doped MoS 2 nanoflowers were prepared by a hydrothermal method. • Mg doping enlarged the MoS 2 interlayer spacing and enhanced piezo-response. • Mg enhanced H 2 O 2 adsorption on Fe sites and strengthened Fenton activity. • ·OH was confirmed as the dominant species for tetracycline degradation. • 5% Fe 3 Mg 1 -MoS 2 achieved 97.8% TC removal and 95.1% after six cycles. Pristine MoS 2 shows promise for piezo-Fenton degradation of organic pollutants, yet its weak piezoelectric response and sluggish surface reaction kinetics severely limit catalytic efficiency. Herein, Fe/Mg co-doped MoS 2 nanoflowers were prepared by a one-step hydrothermal method, and the Fe/Mg ratio was adjusted to construct a catalyst with both piezoelectric response and Fenton activity. Among the samples, 5% Fe 3 Mg 1 -MoS 2 exhibited the best performance. Under ultrasound alone, it degraded 71.9% of tetracycline within 60 min, with an apparent rate constant of 0.0213 min −1 . In the ultrasound/H 2 O 2 system, the degradation efficiency increased to 97.8%, and the rate constant reached 0.0620 min −1 , about 4.0 times that of p-MoS 2 . Structural and surface chemical analyses showed that Mg enlarged the MoS 2 interlayer spacing, induced local lattice distortion, and promoted fewer-layer structures, providing favorable structural conditions for the piezoelectric response under ultrasound. Fe species provided Fe 3+ /Fe 2+ redox sites and promoted H 2 O 2 activation. Radical scavenging and fluorescence tests indicated that ·OH was the dominant reactive species in the ultrasound/H 2 O 2 system, while ·O 2 - and h + also participated in degradation. DFT calculations further showed that Mg neighboring Fe sites enhanced H 2 O 2 adsorption on Fe sites and regulated the local charge distribution. This study demonstrates that Fe/Mg co-doping improves the piezo-Fenton catalytic performance of MoS 2 through structural regulation and electronic coupling, offering guidance for efficient MoS 2 -based catalysts. Download: Download high-res image (350KB) Download: Download full-size image Fe/Mg co-doped MoS 2 nanoflowers were synthesized via a one-step hydrothermal method and achieved 97.8% tetracycline degradation within 60 min, with a rate constant 4.0 times that of p-MoS 2 .
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jianping Ai,Yaping Shuai,Min Hu,Lihong Cheng,Siling Luo,Wenkui Li,Zhiqin Chen,Liling Hu,Zehua Zhou
A novel class of high-entropy (HE) spinel ferrites (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 , have been successfully synthesized by the solution combustion synthesis method followed by heat-treatment at 500–1500 °C. The resultant spinel ferrites were systematically investigated by various methods including XRD , SEM, TEM, EDS, Raman spectra, etc. It was demonstrated that the entropy drives a reversible transformation between a single-phase state and multiphase. And the entropy predominates the thermodynamic landscape. The as-fabricated high-entropy (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 solid solution is single-phase with homogeneous transition-metal element distribution. Moreover, a trade-off between grain growth and crystallization during heat-treatment process; the average grain size of product is only 352.96 nm after being annealed at 1000 °C for 3 h probably due to “sluggish diffusion effect”. The resultant HE spinel ferrites (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 were first used as a heterogeneous catalyst of peroxodisulfate (PDS). Compared with basic solution condition, the HE spinel ferrite/PDS system exhibited a higher degradation rate for the removal of rhodamine B (RhB) and tetracycline (TC) at initial pH range of 3.0–5.1. Both the hydroxyl radicals and sulfate radicals played an important role on RhB and TC degradation. The high catalytic efficiency and good stability of high-entropy (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 catalyst demonstrates that it is suitable for application in wastewater disposal.
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