JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2025
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IF 3
Md Mostafezur Rahman,Shuai-Wen Ding,Mohanraj Kumar,Wei Zhang,Jih-Hsing Chang
Magnetic nanoparticles (MNPs) with temperature-dependent heating behavior offer a promising strategy for self-regulated magnetic induction hyperthermia (MIH) in cancer treatment. This study simulates the temperature-dependent heating performance of Al-doped Zn Mn ferrite nanoparticles (Zn 0.5 Mn 0.5 Al x Fe 2-x O 4 ) in a human liver tumor model, using experimentally validated parameters from previous characterization. The model evaluates in-tumor heating under physiological conditions, focusing on temperature rise, spatial uniformity, and thermal stability. The results confirm that MNPs with lower Curie temperatures (T C ) offer better temperature control, while higher-T C particles enable more efficient heating at reduced concentrations. Experimental validation using magnetic hydrogel phantoms demonstrated good agreement with simulation predictions, with temperature deviations within ±1.5 °C. These findings highlight the importance of incorporating temperature-dependent specific loss power (SLP) behavior for accurate modeling of hyperthermia outcomes and provide a practical framework for optimizing MNP selection and dosage for safe and effective treatment.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2025
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IF 2
Song Jianli,Li Yelong,Wang Weiqiang,Wang Linyue
Chromium volatilization and interfacial oxidation are critical challenges limiting the long-term high-temperature service of ferritic stainless steel (FSS) interconnects in solid oxide fuel cells (SOFCs). In this study, a dense (Co,Mn) 3 O 4 spinel coating was fabricated on E-brite FSS substrates via a composite electrodeposition–thermal conversion approach conducted at 800 °C. A homogeneous single-phase spinel was formed with a stable Cr 2 O 3 interlayer that suppressed chromium volatilization and surface degradation. Microstructural and elemental analyses confirmed the structural integrity. After 500 h of oxidation at 800 °C, the coating remained stable without cracking or spallation. The area-specific resistance (ASR) decreased to 7.9 mΩ·cm 2 , an 80.7% reduction compared with the uncoated alloy (41.0 mΩ·cm 2 ), demonstrating improved electrical conductivity under prolonged exposure. This study provides a practical strategy that uses composite electrodeposition and thermal conversion to enhance both oxidation resistance and electrical performance of ferritic interconnects for intermediate-temperature SOFC applications.
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ACS Nano
·
2025
·
IF 16
Anqiang Jiang,Heng Guo,Shan Yu,Fengying Zhang,Xuan Zhang,Limin Xu,Yi Li,Chun Tang,Xin Tu,Ying Zhou
The electron transfer mechanism involving multiple trapping states has great implications for dictating the photoelectrochemical (PEC) hydrogen evolution reaction (HER). Uncovering the ultrafast dynamics of multiple trapping states in defect-rich catalysts to suppress undesirable Shockley–Read–Hall (SRH) recombination and boost electron extraction remains a crucial yet challenging task. Herein, we bypass defect-induced SRH recombination sites and redirect more excited electrons toward the HER by engineering an additional electron transfer channel within Ag–In–S quantum dots (AIS QDs) via Mn doping. Photoluminescence spectroscopic studies indicate effective charge carrier transfer from the band edge to the doping states, inducing a 5.3-fold enhancement in the electron transfer rate. Using ultrafast transient absorption spectroscopy, we reveal that host photoexcitation leads to subpicosecond electron transfer from the conduction band to the empty Mn2+ d-orbitals in Mn-doped QDs, and the resultant charge transfer state shortens the excited-state electron transfer lifetime from 3.73 to 1.19 ns, corresponding to a 300% acceleration of carrier depopulation and enhancing excited electron availability. Moreover, the evolution of the product composition indicates the improved interfacial utilization of holes, as the applied PEC bias relieves kinetic constraints on hole transfer. Consequently, a saturated photocurrent density of 8.6 mA cm–2 at 0.5 V vs RHE was achieved for the as-fabricated PEC device under one-sun irradiation, comparable to the latest bare heavy-metal-free QD-based PEC systems. These results underscore that modulating electron dynamics, previously dominated by intrinsic defects, through intermediate energy levels is a promising strategy to enable high-efficiency PEC solar energy conversion.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Hong-Mei Fu,Xi-Peng Zhang,Shi-Chao Qi,Ding-Hua Liu
The p -chlorotoluene (PCT) and m -chlorotoluene (MCT) are indispensable chemical intermediates in pharmaceuticals, agrochemicals, and material synthesis. However, the similar physical and chemical properties of the PCT and MCT make their efficient separation a severe challenge in the current chemical separation field. In this study, a metal-organic framework named Mn-dhbq (dhbq = 2,5-dihydroxy-1,4-benzoquinone) is employed to achieve highly efficient separation of PCT/MCT in a solvent system with 1,3,5-trimethylbenzene. The Mn-dhbq exhibits the adsorption capacity of 208 mg/g for PCT and 72 mg/g for MCT at 25 °C, with initial concentration of 20 % for both PCT and MCT. Notably, the dual-site Langmuir-Freundlich selectivity is 38 with the concentration of 1 % for PCT and MCT. Density functional theory (DFT) calculations reveal differences in the amount of charge transfer and interaction sites between the framework and adsorbate, and these factors collectively contribute to the selective separation of PCT and MCT by Mn-dhbq.
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120584
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IF 7.2
Jian Wang,Kejia Lu,Wei Wang,Jianjun Yu,Yaqi Peng,Guanghua Xia,Guanjie Wang
Atomic defects in catalysts (such as vacancies, substituted atoms, or interstitial atoms) are the decisive factors in initiating low-temperature catalytic reactions. The study achieved the selective exposure of Mn-doped CeO 2 (111) crystal planes and facilitated the migration of oxygen species at the interface through the regulation of Mn and Ce precursors, thereby enhancing the low-temperature catalytic performance for chlorobenzene (CB). The Mn: Ce precursor ratio strongly influences activity; Mn 1 Ce 1 shows optimal performance with T 50 ≈ 142 ℃ and T 90 ≈ 192 ℃. Structural analyses confirm Mn incorporation into the CeO 2 lattice across multiple facets, optimizing Mn-O v -Ce interfacial sites, increasing surface acidity, and elevating oxygen‑vacancy (O v ) concentration (3.6 ×10 13 spins/g). CB was nearly completely mineralized to CO 2 at 240 ℃, while chlorine was mainly removed as HCl. Oxygen is crucial for the dynamic generation and cycling of O v , effectively replenishing the consumed adsorbed oxygen (O ads ) during catalysis, whereas the presence of water vapor causes competitive adsorption, reducing catalytic activity. In-situ DRIFTS, in-situ EPR, and DFT calculations demonstrated that surface O ads are the primary active oxygen species. CB trapped by O v is sequentially converted into intermediates (e.g., phenol and benzoquinone) and ring-opening products (e.g., maleic anhydride and formic acid) under the action of O ads , ultimately mineralizing into CO 2 . The Mn-doped CeO 2 (111) crystal facet exhibited the lowest CB adsorption energy (-2.4 eV), O v formation energy (1.1 eV), and HCl formation energy (-1.3 eV). Furthermore, Mn serves as a dechlorination site, effectively promoting C-Cl bond cleavage and inhibiting chlorine poisoning at CeO 2 interface.
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Communications Chemistry
·
2025
·Vol. 8
·期 1
·389
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IF 6.2
Han Lei,Tan Jingying,Zhang Yucui
Given the promising prospect of nanozymes in colorimetric test strips, it is essential to eliminate the interferences of their multi-activities and various colors on the test strip. Here, white Mn-based metal-organic frameworks (Mn-MOFs) with ultrathin 2D morphology (3 nm thick) were successfully synthesized by a simple ultrasonic approach. The origin of the white optical property in Mn-MOFs was systematically investigated, revealing that it stems from specific metal-ligand coordination polymerization rather than morphological features or defect states. Mn-MOF nanozymes possessed exclusive peroxidase-mimicking activity rather than oxidase-like activity, effectively resisting O 2 interference during colorimetric assay. Moreover, Mn-MOF nanozymes displayed unique substrate selectivity without additional modification. Unlike other colored nanozymes, the whiteness of Mn-MOF nanozymes enhanced the paper’s whiteness, boosting contrast for colorimetric detection on test strip. This study pioneers a systematic investigation into the origin of whiteness in MOF nanozymes. The coordination-defined properties enable interference-free optical design and O 2 -resistant on-site detection.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Yaqi Wu,Jianhua Qian,Yanan Wang,Jinjuan Xing,Junhua Li,He Huang,Xueming Kang,Jiasheng Xu
Developing transition metal oxide-based catalysts with both high thermal stability and catalytic activity for the effective volatile organic compounds (VOCs) removal remains a major challenge in heterogeneous catalysis. In this work, a series of Cu, Mn, Co and Ni substituted Co 3 O 4 spinel catalysts with a large number of oxygen vacancies were produced as extremely stable and active substances for the oxidation of toluene. The CuCo 2 O 4 catalyst, prepared through transition metal substitution, demonstrated exceptional performance with T 50 , T 90 , and complete conversion temperatures of 204 °C, 220 °C, and 228 °C, respectively. Furthermore, the CuCo 2 O 4 catalyst displayed markedly enhanced thermal stability compared to other catalysts, which was crucial for practical implementation. Its superior catalytic activity originated from electron transfer between Co and Cu cations, facilitated by lattice oxygen, which increased the Co 3+ /Co 2+ ratio. This structural modification strengthened oxygen migration and reducibility within the spinel framework, facilitating efficient regeneration of lattice oxygen and rapid activation of adsorbed oxygen species. Kinetic analyses corroborated these findings, revealing that CuCo 2 O 4 possessed the lowest activation energy ( E a = 40.40 kJ/mol), thereby reducing the energy barrier for toluene oxidation. These results demonstrate that the CuCo 2 O 4 catalyst represents a promising candidate for practical applications, combining high catalytic activity for toluene oxidation with exceptional operational durability and thermal stability.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2025
·
IF 6.2
Ning Lei,Mupeng Zheng,Xinyue Tang,Haowei Wang,Chaofeng Wu,Ke Wang,Yudong Hou
Highly effective piezoelectric hardening is crucial for high-power device applications. In this work, we introduce a novel piezoelectric hardening approach that synergistically combines oxygen vacancies with precipitates for achieving strong pinning of ferroelectric domain walls. In Mn-doped 0.2Pb(Zn 1/3 Nb 2/3 )O 3 -0.8Pb(Zr 0.5 Ti 0.5 )O 3 (Mn-doped PZN–PZT) ceramic, the substitution of Mn 3 + for Ti 4+ or Zr 4+ results in an acceptor doping hardening, whereas the substitution of Mn 2+ for Zn 2+ leads to the formation of ZnO precipitates, leading to a precipitation hardening. Highly effective piezoelectric hardening via oxygen vacancies and ZnO precipitates in 0.9 wt% MnCO 3 -doped PZN–PZT sample is realized, where the mechanical quality factor ( Q m ) and maximum vibration velocity ( v max ) represent 10 times and 1.2 times increase, compared to the undoped samples. Moreover, the synergistic strategy of integrating oxygen vacancies with ZnO precipitates can significantly enhance the stability of Q m , offering substantial potential for the design of high-power piezoelectric ceramics.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yue Yu,Feng Liu,Xuanzhi Liu,Longquan Li,Binhua Zhou,Hanxiao Liao,Pengfei Tan,Jun Pan
The inevitable electrochemical oxidation accompanied with continuous dissolution of Ru triggers structural distortion, causing insufficient catalytic activity and stability of Ru-based electrocatalysts in acidic oxygen evolution reaction (OER). In this work, we propose a Mn doping strategy to obtain Mn doped RuO 2 (Mn-RuO 2 ) for stabilizing the dynamic Ru. X-ray absorption spectroscopy and X-ray photoelectron spectroscopy results indicate that the doped Mn in RuO 2 preferentially replaces the oxidation of Ru by self-oxidation during the OER process, which significantly suppresses excessive dissolution of Ru. Furthermore, in-situ Raman spectroscopy, in-situ electrochemical impedance spectroscopy, the differential electrochemical mass spectrometry measurements combined with density functional theory calculations demonstrate that the Mn doping is able to strengthen the covalency of metal–oxygen bonds, facilitate lattice oxygen mechanism with elevated energy level of O 2p band. Therefore, Mn-RuO 2 catalyst demonstrates remarkable acidic OER performance, only needing an overpotential of 209 mV to achieve the current density of 10 mA cm –2 , 139 mV lower than that of commercial RuO 2 . And Mn-RuO 2 can maintain stable operation for over 180 h, which is about 18 times that of commercial RuO 2 . Notably, when Mn-RuO 2 is used as the anode, the proton exchange membrane water electrolyzers demonstrates stable operation for 40 h at 100 mA cm −2 . This work offers a strategy to alleviate stability issue of Ru-based catalysts for efficient acidic OER process.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Sen Li,Wei Wang,Yixing Zhao,Zhenwei Zhang,Yongyi He,Chuan Wang,Yongchun Guo,Tingfang Tian,Li Wang,Hu Liu
Zeolite A (LTA)-coated Mn-doped perovskite quantum dot CsPb1–xMnxCl3@LTA (x = 0, 0.2, 0.4, 0.6, and 0.8) composites were fabricated by vapor deposition crystallization. LTA not only improved the water, light, and thermal stability of perovskite quantum dots but also limited the average size of perovskite quantum dots to less than 20 nm. Mn2+ doping improved the exciton lifetime of a perovskite quantum dot matrix. The photogenerated carriers generated by Mn2+ have a decay life of hundreds of microseconds, which effectively improves the photocatalytic efficiency. When x = 0.6, the total yield of CO and CH4 was 1443.25 μmol g–1 (1191.08 μmol g–1 of CO and 252.17 μmol g–1 of CH4). After 5 catalytic cycles, the yields of CO and CH4 remained at 53.77% and 62.27% of their original levels, respectively, indicating that CsPb1–xMnxCl3@LTA has excellent photocatalytic application prospects.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yu Zhou,Molin Sun,Meilan Cao,Yijin Zeng,Mingru Su,Aichun Dou,Xiaochuan Hou,Yunjian Liu
Layered sodium iron manganese oxide cathodes have attracted great interest owing to their high specific capacity and cost-effective metal resources, while the detrimental phase transitions and surface structural degradation severely limit their commercial applications. In this work, the bulk and surface structure stability of a P 2-Na 0.67 Fe 0.5 Mn 0.5 O 2 cathode can be synergically enhanced by a one-step Li/Nb co-doping strategy. Structural characterizations reveal that Li doping promotes the formation of P 2/O3 biphasic structure and makes the unfavorable P 2-OP4 phase transition convert into a smooth solid-solution reaction. Nb doping enhances the mobility of sodium ions and forms strong Nb-O bonds, thereby enhancing the stability of the TMO 2 layer structure. In particular, the Nb element induces the surface reorganization of an atomic-scale NaNbO 3 coating layer, which could effectively prevent the dissolution of metals and surface side reactions. The synergistic mechanism of enhanced electrochemical performance is proved by multiple characterizations during cycling. As a result, the as-prepared Na 0.67 Li 0.1 Fe 0.5 Mn 0.38 Nb 0.02 O 2 exhibits improved capacity retention of 85.4 % than raw material (45.7 %) after 100 cycles at 0.5C (1C = 174 mA g −1 ) within 2.0–4.0 V. This co-regulating strategy provides a promising approach to designing highly stable sodium-ion battery cathodes. Furthermore, a full cell of Na 0.67 Li 0.1 Fe 0.5 Mn 0.38 Nb 0.02 O 2 with hard carbon displays excellent cycling stability (85.1 % capacity retention after 100 cycles), making its commercial operation possible. This synergistic strategy of biphasic structure and surface reorganization is a critical route to accelerate the application of layer oxide cathodes.
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MATERIALS RESEARCH BULLETIN
·
2013
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IF 1.913
L.Z. Pei,Y.K. Xie,Y.Q. Pei,Y.X. Jiang,H.Y. Yu,Z.Y. Cai
Mn vanadate nanosheets have been synthesized via a facile hydrothermal route using ammonium metavanadate and Mn acetate as the raw materials, polyvinyl pyrrolidone (PVP) as the surfactant. X-ray diffraction (XRD) shows that the Mn vanadate nanosheets are composed of monoclinic MnV 2 O 6 phase. Scanning electron microscopy (SEM) observation indicates that the nanosheets have the average thickness of about 50 nm, length of 2–10 μm and width of 800 nm to 2 μm. The growth process of the Mn vanadate nanosheets has also been discussed based on the analysis of the roles of the growth conditions on the formation of the Mn vanadate nanosheets. The nanosheets show good photocatalytic activities for the degradation of methylene blue (MB) under visible light irradiation. About 72.96% MB can be degraded after visible light irradiation for 1 h over 10 mg Mn vanadate nanosheets in 10 mL MB solution with the concentration of 10 mg L −1 .
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危险品化学品经营许可证（带存储）