Scientific Reports
·
2016
·Vol. 6
·期 1
·1-8
·
IF 5.228
Cai Kedi,Yang Rui,Lang Xiaoshi,Zhang Qingguo,Wang Zhenhua,He Tieshi
Gradient Mn-La-Pt catalysts with three-layered structure of manganese dioxide (MnO 2 ), lanthanum oxide (La 2 O 3 ), and Platinum (Pt) for Li-O 2 battery are prepared in this study. The mass ratio of the catalysts is respectively 5:2:3, 4:2:4, and 3:2:5 (MnO 2 : La 2 O 3 : Pt) which is start from the side of the electrolyte. The relationship between morphology structure and electrochemical performance of gradient catalyst is investigated by energy dispersive spectrometry and constant current charge/discharge test. The Li-O 2 battery based on gradient Mn-La-Pt catalysts shows high discharge specific capacity (2707 mAh g −1 ), specific energy density (8400 Wh kg −1 ) and long cycle life (56 cycles). The improvement of the Li-O 2 battery discharge capacity is attributed to the gradient distribution of MnO 2 and Pt and the involvement of La 2 O 3 that can improve the energy density of the battery. More important, this work will also provide new ideas and methods for the research of other metal-air battery.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yifeng Xia,Hua Hao,Cheng Tao,Minghe Cao,Zhonghua Yao,Hanxing Liu
Dielectric capacitors are essential in advanced electronics and power systems due to their high power density and fast charge–discharge rates. However, their application is limited by their low energy storage density and efficiency. Aurivillius-phase ferroelectrics have shown promise as energy storage materials, but their low polarization and significant hysteresis remain critical challenges. In this study, we present a simple and cost-effective defect-engineering strategy to enhance the energy storage performance of SrBi5Ti4FeO18 thin film through Mn doping. Mn incorporation suppresses oxygen vacancy formation and induces tensile chemical stress in the lattice, which simultaneously enhances maximum polarization and reduces the hysteresis. Additionally, the reduction in oxygen vacancies promotes grain refinement, reduces leakage current, and significantly enhances the breakdown strength. The optimized SrBi5Ti3.91Mn0.09FeO18 thin film achieves an ultrahigh energy storage density of 105 J/cm3 with improved efficiency of 70% at 3569 kV/cm. Moreover, it demonstrates good frequency stability (100 Hz to 10 kHz), thermal stability (20–160 °C), and fatigue endurance over 105 cycles. This work provides a feasible method for developing advanced dielectric capacitors with high energy storage performance by the rational design and precise control of defects.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 2
·1286-1296
·
IF 2.599
Cao Sheng,Zheng Jinju,Dai Chencheng,Wang Lin,Li Chengming,Yang Weiyou,Shang Minghui
In this report, doping concentration-dependent photoluminescence (PL) properties of Mn-doped ternary Zn–In–S quantum dots (QDs) were studied by using steady-state and time-resolved PL spectroscopy. The QDs PL was firstly significantly intensified with the increasing Mn doping concentration and then decreased after the doping concentration increased up to 7.5 at.%. However, their decay lifetimes exhibit a monotone decrease with Mn doping concentration ranged from 0 to 10 at.%. It can be concluded that the PL intensity was mainly determined by two factors: one was the increased efficiency of energy transfer from host excitons to Mn 2+ ion accepter, and the other was the decreased efficiency of the emission from a Mn 2+ ion, which was caused by the increased component of exposed Mn 2+ ions on QDs surface and the accelerated interaction between adjacent dopants. The competition of above two exciton relaxation dynamics processes determined the trend of the PL intensity, while the latter was responsible for the monotonously decreased lifetime of the Mn 2+ ion emission with the increasing Mn doping concentration.
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Small
·
2024
·
IF 13
Lili Xu,Jianli Nan,Songxue Han,Zhixuan Yu,Shuangli Wu,Youxing Fang,Shaojun Dong
In nature, active Mn 3+ –ligand complexes produced by laccase catalyzed oxidation can act as the low-molecular mass, diffusible redox mediators to oxidize the phenolic substrates overcoming the limitations of natural enzymes. Learning from the metal–ligand coordination of natural functional units, high-valence Mn metal–organic framework (Mn MOF) is constructed to simulate the catalysis in natural mediator system. Benefiting from the characteristics of nanoscale size, rich metal coordination unsaturated sites, and mixed valence state dominated by Mn(III), Nano Mn(III)-TP exhibits superior laccase-mimicking activity, whose V max (maximal reaction rate) is much higher than that of natural laccase. Referring to natural systems, relevant free radical experiments prove that the material induces the production of active oxygen species with the assistance of carboxylic acid, and active oxygen species further oxidize phenolic substrates. Based on its robust performances, the primary oxidative degradation of an emerging pollutant triclosan (TCS) is creatively applied, an important antiasthmatic medicine terbutaline sulfate (TBT) detection, and the synthesis of non-toxic and black near-natural dyes for dyeing. By simulating the essential mediators of natural enzymatic catalysis, an Mn MOF-based material that demonstrates multiple novel applications is successfully developed, which introduces a new reliable strategy for achieving versatile nature-mimicking catalysis.
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Biomedical Materials
·
2024
·Vol. 19
·期 6
·065025
·
IF 3.9
Xiaohuan Guo,Qi Fang,Nan Leng,Yuan Liu,Bingbing Cai,Yuzhu Zhou,Changchun Wen
Chemodynamic therapy (CDT) is a new method for cancer treatment that produces highly toxic reactive oxygen species (ROS) in the tumor microenvironment to induce cancer cell apoptosis or necrosis. However, the therapeutic effect of CDT is often hindered by intracellular H2O2 deficiency and the activity of antioxidants such as glutathione (GSH). In this study, a nano-catalyst HCM was developed using a self-assembled Cu/Mn-doped metal-organic framework, and its surface was modified with hyaluronic acid to construct a tumor-targeting CDT therapeutic agent with improved the efficiency and specificity. Three substances HHTP (2, 3, 6, 7, 10, 11-hexahydroxybenzophenanthrene), Cu2+, and Mn2+ were shown to be decomposed and released under weakly acidic conditions in tumor cells. HHTP produces exogenous H2O2 in the presence of oxygen to increase the H2O2 content in tumors, Cu2+ reduces GSH content and generates Cu+ in the tumor, and Cu+ and Mn2+ catalyze H2O2 to produce OH in a Fenton-like reaction. Together, these three factors change the tumor microenvironment and improve the efficiency of ROS production. HCM showed selective and efficient cytotoxicity to cancer cells, and could effectively inhibit tumor growth in vivo, indicating a good CDT effect.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhi Chen,Yingnan Hua,Bing Chen,Jiwen Feng,Gang Liu,Bin Jiang
MOFs (metal–organic frameworks) have large specific surface area, abundant active sites, and tunable pore structures, making them highly attractive anode materials for lithium-ion batteries. However, their inadequate electrical conductivity and rate performance greatly hinder the further applications of MOFs in field of energy storage. In this study, we present a robust Mn-MOF/HA (humic acid) composite anode material with multilayer nano-sheet structures, synthesized via in-situ compositing HA with Mn-MOF in general hydrothermal reaction. The Mn-MOF derived from hydrothermal reaction shows poor electrochemical stability and low electrical conductivity. The incorporation of HA notably elevates electrochemical stability of materials, boosts both electrical and lithium-ion conductivity, and also modulates the microstructure to form ultrathin multilayer nanosheets by rationally adjusting the feed ratio of HA. The resulting HA 20 -Mn-MOF (with a HA feed ratio of 20 %) demonstrates significant improvements in cycling stability and rate performance, with a reversible specific capacity of 1318.7mAh/g at 0.1 A/g after 100 cycles and a substantial capacity of 657.0mAh/g even after 1000 cycles at 1 A/g. An extraordinary V-shaped capacity reversal is observed for HA 20 -Mn-MOF during cycling. Ex-situ EPR (Electron Paramagnetic Resonance) investigation reveals this capacity growth is associated with the reoxidation of active manganese during cycling, in which a notable correlation between the specific capacity and the Mn 2+ signal intensity in EPR spectra is found. These results suggest in-situ compositing HA with MOFs can be a cost-effective strategy in regulating MOFs morphology and in achieving an optimized electrochemical performance for MOFs-based electrode materials in energy storage field.
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ChemistrySelect
·
2024
·Vol. 9
·期 35
·e202402650
·
IF 1.9
Xinyi Wang,Zihan Cheng,Yuting Liu,Li Wang,Lili Chen
Graphical In the study, Mn-functionalized ZIF-67 (Mn@ZIF-67) hybrid material was synthesized using a post-synthesis modification method. Its oxidase-like catalytic activity effect enabled this material to directly oxidize colorless TMB into blue oxTMB without the presence of H 2 O 2 . This color change provided a means for the detection of Art and AA. The work also demonstrated the practical application of this method in analyzing real samples containing AA or Art. Artemisinin (Art) is the first-choice medicine for treating malaria. It also shows good therapeutic effects in antibacterial and antitumor treatment. Therefore, a simple and efficient method for detecting Art is of great significance. Mn-functionalized ZIF-67 (Mn@ZIF-67) hybrid materials were synthesized using a post-synthesis modification method. Due to the introduction of Mn 2+ , Mn@ZIF-67 possesses higher peroxidase/oxidase like dual-mimic enzymes activity than ZIF-67, which can catalyze Art and generate peroxyl radicals. Based on this fact, Mn@ZIF-67 was used to detect Art in the presence of TMB. A good linear relationship between absorption intensities at 652 nm and Art concentrations was obtained in the range of 0–22 μM with a detection limit of 200 nM. Ascorbic acid (AA), due to its reducibility, can inhibit peroxidase/oxidase mimetics activity of Mn@ZIF-67 and the blue Mn@ZIF-67-TMB solution fades gradually with the addition of AA. Mn@ZIF-67-TMB acting as a colorimetric sensor, AA can be sensitively detected ranging from 0–30 μM, and the detection limit is 50 nM. Coexisting substances don't interfere with the detection of Art or AA. This sensing platform provides a highly sensitive and selective colorimetric method for monitoring AA and Art in serum, thereby demonstrating remarkable practicality.
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Coatings
·
2024
·Vol. 14
·期 11
·1392
·
IF 2.9
Yangyang Zhang,Hui Li,Erping Wang,Jingxia Gao,Liqin Yue,Miao Zhao,Ling Zhang
NaNbO3-based ferroelectric composites are regarded as a highly promising typical energy storage material. In this work, 0.02xMnO2−(1−x)NaNbO3−xBi0.5Na0.5TiO3composites were prepared by the solid-state sintering method and their microstructure, energy storage performance, and temperature stability were analyzed. As observed by the SEM images, the addition of Bi0.5Na0.5TiO3to NaNbO3in appropriate amounts can effectively suppress grain growth, which is beneficial for improving the breakdown field strength. Whenx= 0.3, an optimal value of 210 kV/cm is achieved. Meanwhile, as 2θ = 33.2°, the most intense XRD peak can be observed, indicating excellent solid solubility between the phase components. Consequently, 0.006MnO2–0.7NaNbO3–0.3Bi0.5Na0.5TiO3composites demonstrated an impressive discharging storage density of 2.464 J/cm3and a considerable energy storage efficiency of 85.8%. In addition, within the temperature range of 30–80 °C, the fluctuation in energy storage density remains below 10%. All the above performances indicate that this type of material exhibits excellent practicality in the field of pulse power supply.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Ping Zhang,Feiping Zhao,Penggang Li,Junhao Zheng,Weichun Yang,Qingzhu Li,Zhihui Yang
Electrocoagulation (EC) is a facile technique for removing arsenic (As) pollutants from different water matrices with high efficiency. In this work, a novel strategy of Mn-assisted Fe EC was developed to further enhance the removal efficiency of arsenite [As(III)] from wastewater. When 1 mM of MnCl 2 was added to an Fe-EC system, the As removal efficiency reached 99.99%, and the residual concentration was only 9 μg/L, which is lower than the World Health Organization’s limit for drinking water . The characteristics of the generated flocs by four different EC processes in Fe, Fe-Mn, Fe-As, and Fe-Mn-As systems were investigated. The results showed that Mn 2+ promoted the formation of FeOOH, FeO x , MnO x , FeHAsO 4 , and MnHAsO 4 through low crystallinity and a high surface area . Density functional theory simulation and crystal orbital hamiltonian population confirmed that the generated Fe-Mn flocs had a greater adsorption affinity for As(III) and arsenate [As(V)]. The possible reactions in the EC processes and reaction mechanisms were also hypothesised. The current work provides meaningful insights into understanding the mechanisms of Mn-assisted Fe-EC systems, and further confirms its potential for practical applications in As pollution treatment.
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Environments
·
2024
·Vol. 11
·期 7
·136
·
IF 3.5
Junhao Zheng,Mei Jiang,Qingzhu Li,Weichun Yang
Fe/Mn (hydr)oxides are metallic compounds that exhibit significant redox activity in environmental media and play a pivotal role in geochemical processes, thereby influencing the fate of metals in porous media. The morphology of Fe/Mn (hydr)oxides in natural environments and their interactions with trace metals are significantly influenced by the presence of natural organic matter (NOM). However, there is limited understanding regarding the formation, transport, and stability of Fe/Mn (hydr)oxides in the environment. The present study employed humic acid (HA) as a representative NOM material to investigate the positive influence of HA on the formation of Fe/Mn colloids. However, there remains limited comprehension regarding the formation, transport, and stability of Fe/Mn (hydr)oxides in the natural environment. In this study, we investigated the positive effect of natural organic matter (NOM) on the formation of Fe/Mn colloids using humic acid (HA) as a representative NOM material. We comprehensively characterized the chemical and physical properties of HA–Fe/Mn colloids formed under various environmentally relevant conditions and quantitatively analyzed their subsequent aggregation and stability behaviors. The findings suggest that the molar ratios of C to Fe/Mn (hydr)oxide play a pivotal role in influencing the properties of HA–Fe/Mn colloids. The formation and stability of HA–Fe/Mn colloids exhibit an upward trend with increasing initial molar ratios of C to Fe/Mn. Redox and metal–carboxylic acid complexation reactions between HA and hydrated iron/manganese oxides play a pivotal role in forming colloidal HA–Fe/Mn complexes. Subsequent investigations simulating porous media environments have demonstrated that the colloidal structure resulting from the interaction between HA and Fe/Mn facilitates their migration within surrounding porous media while also enhancing their retention in the surface layers of these media. This study offers novel insights into the formation and stabilization mechanisms of HA–Fe/Mn colloids, which are pivotal for comprehending the behavior of Fe/Mn colloids and the involvement of Fe/Mn (hydr)oxides in geochemical cycling processes within porous media.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Changcheng Sun,Lyumeng Ye,Peng Lu,Xianhui Yan,Jianhang Huang,Zhixiong Tang,Dongyao Chen,Chaoping Cen
The key point to broaden the operating temperature window for synergistic control of NO x and oxygenated volatile organic compounds (OVOCs) with high NO x /VOCs conversion and N 2 /CO 2 selectivity relies on development of appropriate catalysts. Herein, a silver-modified Mn/HZSM-5 catalyst was designed, which achieved an effective NO x and acetone co-removal activity and maintained over 90 % N 2 /CO 2 selectivity at a broad temperature range from 293 to 400 °C. The excellent performance of MnAg/HZSM-5 was due to large surface area, plenty of oxygen vacancies and Lewis acid sites, as well as outstanding oxygen mobility and reducibility that derived from the interactions between Mn 4+ /Mn 3+ and Ag + /Ag 0 . NO x reduction followed both Eley-Rideal and Langmuir-Hinshelwood mechanisms, while acetone hardly replaced NH 3 as a reduction agent. Acetone oxidation underwent acetone → acetate → formate → carbonate → CO 2 and H 2 O following a Mars-van Krevelen mechanism. NH 3 participated in acetone oxidation, forming amide and nitrile species, which caused catalyst deactivation and secondary pollution.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shuangjie Xu,Huan Zheng,Chongqi Wang,Kaifeng Li,Xinyue Xu,Hongmeng Zhang,Yanda Ji,Lei Qiu,Hao Yang
Real-time impact monitoring is essential to ensure the safe service and efficient operation of the aircraft structure. By embedding the piezoelectric sensor array within the structure and applying appropriate signal processing algorithms, the impact position can be precisely localized, enabling real-time monitoring of the aircraft structure. With the development of supersonic aircraft, the fuselage skin of the aircraft is often exposed to high temperatures and other harsh environments during flight. However, the relatively low operating temperature significantly limits the application of traditional piezoelectric sensor arrays in high-temperature impact monitoring. The Mn-doped BiFeO 3 -BaTiO 3 ceramics exhibit excellent piezoelectric properties and high Curie temperature ( T c ), making them promising for high-temperature impact monitoring of the supersonic aircraft. In the present work, we fabricated a sensor array based on 0.7BiFeO 3 -0.3BaTiO 3 -0.25 %molMnO 2 (73BFBT-Mn) ceramic, which demonstrates a T c of 478 °C and a piezoelectric charge constant ( d 33 ) of 125 pC/N at room temperature. Significantly, the 73BFBT-Mn ceramic sensor array maintains a good impact localization accuracy from 25 °C to 200 °C combined with the improved path imaging algorithm. This is attributed to the construction of virtual paths within the sensor array and the extraction of impact signal features, which represent the major improvement compared to traditional path imaging algorithms. The 73BFBT-Mn ceramic sensor array exhibits significant prospects for high-temperature impact monitoring, particularly in the monitoring of supersonic aircraft fuselage skins.
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