MICROPOROUS AND MESOPOROUS MATERIALS
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2014
·
IF 3.209
Ben Qi,Lan-Lan Lou,Yanbing Wang,Kai Yu,Ying Yang,Shuangxi Liu
Manganese containing mesoporous materials Mn-MCM-41 were prepared by template-ion exchange (TIE), in situ reduction (ISR), direct hydrothermal (DHT) and wetness impregnation (WI) methods. The samples were characterized by XRD , N 2 adsorption–desorption, HR-TEM, TG, UV–Vis, H 2 -TPR and ESR techniques, which illustrated that the definite structure of the MCM-41 was retained after introducing Mn into MCM-41 by different method. The catalytic activity and selectivity of the Mn-MCM-41 in the epoxidation of styrene with 30% H 2 O 2 as an oxidant agent were explored. The TIE catalysts showed the highest activity but Mn 2+ was leached during the reaction. The ISR catalysts exhibited high activity for epoxidation of styrene. Furthermore, recycling studies proved the ISR catalysts as heterogeneous catalysts , which did not lose the catalytic activity after four recycles appreciably. However, the DHT and WI catalysts showed poor performance in the catalytic epoxidation of styrene. Various parameters such as different reaction molar ratio of H 2 O 2 /styrene, catalyst amount, and kinds of solvents were studied to optimize the reaction conditions.
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高影响因子
Journal of Energy Storage
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2024
·
IF 8.9
Qingtang Zhang,Qiqi Shu,Fei Lian,Chunyang Du,Pengfei Gao,Ya You
Layered transition metal oxide is considered as one of the most promising cathode materials for sodium-ion batteries due to the abundant reserves of Na, Fe, and Mn. Moreover, the trivalent Fe substitution weakens the Jahn–Teller effect and enhance the crystal structure during the de/intercalation of Na + . Herein, a series of Mn-rich P2-type Na 0.67 Fe 0.1 Mn 0.9 O 2 (NFMO-600, NFMO-700 and NFMO-800) are prepared using combustion synthesis followed by calcinating at 600, 700 and 800 °C, respectively. As confirmed by XRD and SEM , NFMO-700 owns ultrafine high-purity crystal particles with a larger layer spacing and a smaller crystal size. Owing to these unique structures, NFMO-700 exhibits excellent electrochemical performance , delivering an impressive 179 mA h g −1 at 0.2C, with a capacity retention of 84.43 % after 100 cycles at 0.5C.
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Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2019
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IF 1.163
Huayao Chen,Junlong Hu,Hongjun Zhou,Xinhua Zhou,Hua Xu
The triblock copolymer F127 (molecular formula (EO)106(PO)70(EO)106) was adopted as template with TMOS as the silica source. They were hydrolyzed by acidic aqueous solution in which chlorpyrifos (CH) and metal ions (Mn+) were introduced to the products to construct "F127-Mn+-CH" coordination structure in one step. Different sustained release systems were prepared through changing the composition of acidic aqueous solution added during the preparation. The characterization results confirmed the coordination interaction existing among metal ions, mesoporous silica and chlorpyrifos. It was also proved that the chlorpyrifos loaded in the sustained release system existed as amorphous state. According to SEM and TEM observation, the pore of the material presented as face-centered cage-type cubic structure with IM-3M symmetry similar to SBA-16 which is in accordance with N2 adsorption isotherms. The as-synthesized system showed significant pH sensitivity in the sustained release process indicating that the sustained release system can be well stored in neutral environment and activated while sprayed into earth in acid or basic environment. Their sustained release curves can be described by Korsmeyer-Peppas equation in neutral while accords with Higuchi under acid or basic environment.
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RSC Advances
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2018
·Vol. 8
·期 4
·1940-1947
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IF 2.936
Pengchao Wang,Bohua Dong,Zhenjie Cui,Rongjie Gao,Ge Su,Wei Wang,Lixin Cao
Metal-halide perovskite nanocrystals (NCs) are considered to be promising types of optoelectronic and photonic materials. The emission colors of the cesium lead halide perovskite (CsPbX3, X = Cl, Br, I) NCs depend on the joint influence of the emission peaks of the host and its dopant ions. Herein, we report a phosphine-free strategy to synthesize Mn-doped CsPb(Cl/Br)3 NCs to tune their optical properties in a wide color gamut. Colloidal Mn-doped CsPb(Cl/Br)3 NCs were synthesized by injecting Cs-oleate solution into the MnCl2 and PbBr2 precursor solution. The as-prepared Mn-doped CsPb(Cl/Br)3 NCs are highly crystalline and uniform sized nanocubes with two emission peaks, including the host emission around 450 nm and the Mn2+ dopant emission around 600 nm, which are sensitive to the MnCl2-to-PbBr2 molar feed ratio and the reaction temperature. By varying the MnCl2-to-PbBr2 molar feed ratio or the reaction temperature, the relative PL intensities of dual color emission can be manipulated, showing their ability in tunable color output.
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CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 20
·38263-38273
·
IF 5.1
Fan Zhang,Junhui Tan,Pengfei Wang,Rongxia Huang,Hua-Tay Lin,Xiong Huang,Jun Yang,Zhenxiao Fu,Xiuhua Cao,Lei Zhang,Shuhui Yu,Rong Sun
Due to the tendency of base metallization of the inner electrodes in BaTiO 3 based multilayer ceramic capacitors (MLCCs), they usually need to be sintered in reducing atmosphere. However, the reducing atmosphere will change the properties of BaTiO 3 based dielectric materials , which will affect their properties and applications. Therefore, in this study, BaTi 1- x Mn x O 3 ( x = 0.003, 0.006, 0.01) ceramics were prepared by solid phase method and sintered in air and reducing atmosphere. The effects of MnO 2 doping and different sintering atmosphere on dielectric properties and reliability of the materials were studied. The results show that the dielectric constant and insulation resistance of the samples decreases with the increase of doping concentration. In addition, the dielectric constant of the samples sintered in air is lower than that in reducing atmosphere, when x = 0.003, the dielectric constant and dielectric loss are 2011, 2205 and 1.5 %, 1.4 %, respectively. This is due to the effect of flippable and non-flippable domain density, which is proportional to the dielectric constant and dependent on the defect dipole. However, the insulation resistivity of samples sintered in air is higher than that in reducing atmosphere, when x = 0.003, it is 3.3 × 10 12 Ω mm and 1.0 × 10 12 Ω mm, respectively. The decrease of insulation resistivity is related to oxygen vacancy and dipole defect. This study provides an important reference for further improving the performance of base metal electrode MLCCs.
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ACS Nano
·
2025
·
IF 16
Huangxu Li,Xu Wang,Fangyan Liu,Yulun Wu,Jingqiang Zheng,Zezhou Lin,Tiancheng Liu,Jin Xiao,Jianzhong Jiang,Haitao Huang
Fe- and Mn-based polyanionic electrode materials are important cathode materials for sodium-ion batteries (SIBs) due to their low cost. However, due to the low redox potential of Fe2+/3+ and the notorious Jahn–Teller (JT) effect, severe lattice distortion that is associated with Mn2+/3+ redox hinders Fe and Mn redox activation, leading to inadequate cycling stability and rate performance. Here, we discover both high Mn2+/3+ and Fe2+/3+ redox activation in a Na4Mn1.5Fe1.5(PO4)2(P2O7) (NMFPP) material. It is revealed that the substitution of Mn reduces the Fe–O bond covalency, elevating the Fe2+/3+ redox potential to improve the energy density. Furthermore, the JT effect is accompanied by Mn eg orbital splitting, with the dx2–y2 and dz2 orbitals being positioned at the top of the valence band and the bottom of the conduction band, respectively, which primary contributes to reduce the material band gap and facilitate electron transfer. Experimental and theoretical studies discover an anisotropic lattice distortion behavior, which enlarges Na+ diffusion pathways, lowering diffusion energy barriers and enabling rapid Na+ migration. As a consequence, high Fe–Mn redox activity is achieved and the NMFPP demonstrates enhanced energy density, rate performance, and exceptional cycling stability for sodium storage. These findings prove that the JT effect and lattice distortion could synergistically make positive impacts on transition-metal redox activation, which is informative for the design of high-performance electrode materials.
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PubMed
高影响因子
Results in Chemistry
·
2026
·
IF 5.8
Xianping Luo,Sihao Yu,Hepeng Zhou,Yongbing Zhang,Jin-Ru Feng
Porous biochar derived from discarded corn stalks was developed as a regenerable adsorbent for treating Tl-containing wastewater. The Tl adsorption capacity of Fe–Mn–Y doped biochar (FMYBC) was significantly enhanced compared to unmodified biochar. The IPD model accurately described Tl(I) adsorption on FMYBC, indicating that intraparticle diffusion is a key controlling step. Removal efficiency remained largely stable over a broad initial pH range of 3–13. Doping with rare earth elements markedly improved the adsorption performance of Fe Mn modified biochar under acidic conditions. However, the presence of coexisting ions (Na + , Mg 2+ , Ca 2+ ) reduced FMYBC's Tl + adsorption capacity. After two adsorption–desorption cycles, MFYBC retained 86.4% of its initial Tl removal capacity, demonstrating good stability and regeneration potential. Based on XPS and FTIR analyses, the primary Tl(I) removal mechanisms include ion exchange, surface complexation, and oxidation.
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CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Chenhao Zhu,Liyang Lin,Benrun Shi,Yu He,Shuo Gao,Yan Wang,Tingbo Wang
Most studies on Mn-based NTC thermistors have been limited to fixed or narrow Ni/Co ratios, lacking a systematic investigation of the full compositional range. This gap impedes the rational and precise design of high-performance thermistors. Here, we prepared Co x Ni 1-x Mn 2 O 4 (x = 0, 0.25, 0.5, 0.75, 1) series thermistors via solid-state reaction, achieving single-phase spinel structures across all compositions. The grain size of Co x Ni 1-x Mn 2 O 4 dropped sharply when the Co content reached 0.5, then increased slightly as x was raised further to 1. The Co 0.25 Ni 0.75 Mn 2 O 4 (x = 0.25) thermistor exhibited the lowest resistivity (1.42 kΩ at 25 °C), while Co 0.75 Ni 0.25 Mn 2 O 4 (x = 0.75) delivered optimal comprehensive performance, combining low resistivity (4.16 kΩ) with high sensitivity (B 25-50 = 3.38 × 10 3 K). When the Co content reached the maximum (x = 1), the thermistor exhibited the highest B 25-50 (up to 3.96 × 10 3 K), corresponding to the optimal sensitivity in the temperature measurement range. The resistivity of Mn-Co-Ni based thermistors is mainly determined by the concentration of Mn 3+ /Mn 4+ ion pairs (especially Mn 3+ ) and additionally modulated by the grain size (grain boundary resistance), which establishes a clear structure-performance correlation for the system. This work provides technical references for developing high-performance, precisely designable Mn-based thermistors and lays a foundation for rational Ni/Co ratio regulation in similar spinel NTC systems.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 22
·44876-44882
·
IF 5.1
Xiaqing Jiang,Zhangwen Long,Hao Song,Jingjing Li,Junyi Yang,Yuting Wu,Dacheng Zhou,Yong Yang,Qi Wang,Jianbei Qiu
The orange-red phosphor, which combines persistent luminescence and mechanoluminescence , holds significant importance in advanced bioimaging and optical anti-counterfeiting. However, there are relatively few reports on this type of material currently. In this study, doping CaAl 2 Si 2 O 8 : Mn 2+ phosphor with Pr 3+ ions significantly increases the material's defect density. Under X-ray/UV excitation, the sample displays exceptional orange-red persistent luminescence and superior mechanoluminescence. More importantly, the samples exhibit the above properties in all temperature regions (including low temperature, room temperature (RT) and high temperature). Additionally, the material demonstrates excellent tissue penetration capabilities and dual-mode luminescence (persistent luminescence and mechanoluminescence), highlighting its potential for bioimaging and optical anti-counterfeiting applications.
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高影响因子
Journal of Environmental Sciences
·
2024
·
IF 5.9
Xixian Huang,Bing Yang,Ye Dou,Yang Ding
The abiotic oxidation of divalent manganese (Mn(II)) and the formation of Mn oxides are important geochemical processes, which control the mobility and availability of Mn as well as element cycling and pollutant behavior in soils. It was found that iron (oxyhydr)oxides can catalyze Mn(II) oxidation , but the effects of the coexisting dissolved organic matter (DOM) molecules on the catalysis of different iron (oxyhydr)oxides for Mn(II) oxidation are poorly understood. Herein, we investigated Mn(II) oxidation under the impacts of the interactions between iron (oxyhydr)oxides (i.e., ferrihydrite, goethite and hematite) and DOM molecules. Simultaneously, we elucidated the variations of DOM composition and properties. Our results indicated that the catalysis of iron (oxyhydr)oxides for Mn(II) oxidation was significantly inhibited by DOM. Moreover, DOM had less inhibiting effect on the catalysis of ferrihydrite for Mn(II) oxidation and the formation of Mn oxides (e.g., hausmannite and buserite) relative to goethite and hematite, which was partially because of the higher electron transfer capacities of ferrihydrite. Meanwhile, DOM molecules with high nominal oxidation state of carbon (NOSC), molecular weight, unsaturation and aromaticity were selectively adsorbed and oxidized by Mn oxides , including the oxygenated phenols and polyphenols. The newly formed molecules mainly belonged to phenols depleted of oxygen and aliphatics. Furthermore, NOSC was a key molecular characteristic for controlling DOM composition during DOM adsorption and oxidation by Mn oxides when iron minerals were present. Overall, our research contributes to understanding Mn(II) oxidation mechanisms under heterogeneous systems and behaviors of DOM molecules in the environment.
研究领域:
环境地球化学
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土壤化学
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水文地球化学
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有机-矿物相互作用
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元素生物地球化学循环
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ULTRASONICS SONOCHEMISTRY
·
2026
·
IF 10.2
Ruida Li,Huaxing Li,Fafeng Xia,Chunyang Ma,Zhongmin Xiao
To overcome the challenge of building stage-wise energy storage devices with tunable charge distribution, a novel electrodeposition method was developed using ultrasonic disruption. This technique enabled the fabrication of nickel–cobalt–manganese (Ni-Co-Mn) ternary oxide electrodes with vertically graded structures. The gradient was created by sequentially depositing four layers under varying ultrasonic power densities (10–40 W·cm −2 ) and substrate tilt angles (15°-45°). By precisely adjusting these parameters, a series of vertically graded NCM-x electrodes was synthesized. Among them, the NCM-11 sample, prepared using a power density ( P ) equal to 30 W·cm −2 and a tilt angle of 35°, revealed the most favorable morphology and electrochemical performance. Characterization using TEM and XPS confirmed the uniform distribution of NiO, Co 3 O 4 , and MnO 2 phases. BET analysis exhibited a specific surface area equaling 56.97 m 2 ·g −1 . Electrochemical measurements revealed that NCM-11 delivered a high specific capacitance equal to 1430.7F·g −1 at 1 mA·cm −2 , retaining 1334.9F·g −1 even at 15 mA·cm −2 , with excellent cyclic stability, maintaining 93.3 % of its capacitance following 5000 cycles. When assembled into an asymmetric supercapacitor (NCM-11//AC), the device achieved an energy density equal to 45.6 Wh·kg −1 at P = 830.7 W·kg −1 , and 30.8 Wh·kg −1 at P = 2440.3 W·kg −1 . It also demonstrated exceptional long-term stability, maintaining 96.2 % of its capacitance following 5000 cycles. These findings showcase the prospective value of ultrasonic-assisted, gradient-controlled electrodeposition for developing high-performance supercapacitor electrodes.
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高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Xu-yang Guo,Renagul Abdurahman,Xing-hong Pan,Rui Zhang,Ling-hua Zuo,Rui-hong Xu,Tao Li,Xue-Bo Yin,Ming Guan
First synthesis of Mn-CeO 2 @ZnGa₂O₄:Cr³⁺, Eu³⁺ composite. • Trimodal sarcosine detection using phosphorescence, peroxidase mimicry, and photothermal TMB. • Smartphone-based mobile tool enables on-site sarcosine detection. • Paper-based chip sensor simplifies sarcosine detection, making it facile and convenient. Prostate cancer (PCa) is the second most common cancer in men, while sarcosine levels have profound implications for the state of prostate cancer. Herein, we have designed a smart paper-chip sensor based on Mn-CeO₂ nanozyme@persistent luminescent nanoparticles (PLNPs) for trimodality fluorescence, colorimetric, and photothermal detection of sarcosine. The PLNPs were prepared as ZnGa₂O₄: 0.5% Cr 3+ , 1.5% Eu 3+ and then integrating Mn-CeO₂ nanozyme. The composite was integrated onto a polypropylene (PP) substrate as the paper chip. In pa1rticular, PLNPs exhibited the afterglow emission for eliminating the interference from the autofluorescence of biological samples; In the presence of both sarcosine and sarcosine oxidase, red phosphorescence is restored, for phosphorescence detection. The nanozyme of Mn-doped CeO₂ exhibit enhanced peroxidase activity, rapidly converting colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into a blue form as oxidized TMB, which also possesses photothermal conversion capabilities, enabling both colorimetric and photothermal detection. Using a smartphone, this sensor enables on-site detection of sarcosine in serum with a detection range of 0–10 μM with extremely low limits of detection (LOD) as 1.88 μM for fluorescence; 0.08 μM for colorimetry; and 1.88 μM for photothermal mode, with all RSD below 5%. Overall, we have successfully designed for the detection of sarcosine in serum. The sensor's low cost, high sensitivity, and portability have been validated, thereby improving treatment success rates and survival rates for patients with early-stage prostate cancer. Scheme 1. Schematic illustration of a smartphone-based Mn-CeO₂@persistent luminescence nanoparticles (PLNPs) paper-based sensor for triple-mode detection of sarcosine. ZnGa₂O₄: Cr 3+ , Eu 3+ (ZCEGO) was fabricated as PLNPs featuring red emission at 700 nm. The PLNPs were surface-functionalized with Mn-CeO₂ nanozymes as peroxidase mimics, and the resultant nanocomposite was further incorporated onto a paper-based substrate. In the presence of sarcosine and sarcosine oxidase (SOX), H₂O₂ is generated. In Zone 1 (yellow section), the PLNPs are exposed, enabling phosphorescence detection. Meanwhile, in the presence of TMB, TMB in Zone 2 (white section) is oxidized to oxTMB, enabling colorimetric detection. The oxTMB can be used for photothermal detection upon irradiation with an 808 nm laser. Quantitative analysis of sarcosine is achieved using a smartphone. Download: Download high-res image (102KB) Download: Download full-size image
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