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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Nano Express
·
2020
·Vol. 1
·期 1
·010056
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IF 0
Shuhong Xu,Ruohu Zhang,Hao Wu,Yiping Cui,Chunlei Wang,Haibao Shao
The incorporation of impurity cation as a way of introducing various novel functionalities provides an additional level of control over the electronic and optical properties of perovskite nanocrystals (NCs). However, the conventional post-synthetic cation exchange approaches suffer from large time and energy consumption. In this work, we developed a novel one-pot method to synthesize Mn-doped CsPbClxBr3−x NCs by merit of sonochemical technique, achieving dramatically rapid reduce of time and energy consumption. The localized hot spots with high transient temperature, pressure, and cooling rate, as well as an excellent stirring action of ultrasonic preparation facilitate the diffusion of Mn2+ in perovskite lattice. Besides, further reaction kinetics investigation reveals an apparent decrease of reaction order from original method (2.4) to our ultrasound-assisted method (1.0).
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yingying Xing,Di Li,Longhua Li,Huamei Tong,Deli Jiang,Weidong Shi
Electrocatalytic hydrogen evolution under alkaline media holds great promising in hydrogen energy production. Transition-metal sulfides (TMSs) are attractive for electrocatalytic alkaline hydrogen evolution, yet their catalytic performance is unsatisfactory owing to the sluggish water dissociation kinetics. Herein, a Mn/N co-doping strategy is proposed to regulate the water dissociation kinetics of Co 9 S 8 nanowires array grown on nickel foam thus improve the activity of hydrogen evolution reaction (HER). The optimal Mn/N co-doping Co 9 S 8 (Mn–N–Co 9 S 8 ) catalyst achieves low overpotentials of 102 and 238 mV at 10 and 100 mA cm −2 in the 1 M KOH solution, respectively, remarkably higher than the single-doping Mn–Co 9 S 8 and N–Co 9 S 8 as well as superior to many reported Co 9 S 8 -based HER electrocatalysts . Density functional theory (DFT) calculation results confirm that the water dissociation barrier of the Mn–N–Co 9 S 8 is reduced significantly owing to the synergistic co-doping of Mn and N, which accounts for the enhanced alkaline HER performance. This study offers an effective strategy to enhance the alkaline HER activity of TMSs by accelerating water dissociation kinetic via the cation and anion co-doping strategy.
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MATERIALS RESEARCH BULLETIN
·
2013
·
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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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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DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 4
·1849-1861
·
IF 3.5
Haodi Dong,Changcheng Liu,Que Huang,Yanjun Chen
Nowadays, the poor conductivity and unstable structure have become obstacles for the popularization of Na3V2(PO4)3 (NVP). In the current work, a dual-modified Mn0.1Cl0.3-NVP composite doped with Mn and Cl is prepared by a facile sol–gel method. When Mn2+ with a large ionic radius replaces small V3+, it can improve the stability of the NVP crystal structure. In addition, the replacement of V3+ by Mn2+ in a low valence state can generate redundant hole carriers, which is conducive to the rapid transport of electrons. The substitution of PO43− by Cl−, which is more electronegative, can reduce the impedance and facilitate the movement of Na+. Owing to the synergistic effect of Mn and Cl co-substitution, the structural stability of NVP was systematically enhanced, and the electron transfer and ion diffusion were effectively improved. Consequently, the optimized Mn0.1Cl0.3-NVP sample demonstrated superior electrochemical performance and kinetic properties. It exhibited a high reversible capacity of 109.2 mA h g−1 at 0.1C. Even at 15 and 30C, high discharge capacities of 70.3 mA h g−1 and 68.2 mA h g−1 were observed after 2000 cycles with capacity retention above 80%. Moreover, it delivered remarkable capacities of 77.1 and 73.4 mA h g−1 at 100 and 200C with retained capacity values of 50.3 and 47 mA h g−1, respectively, after 2000 cycles. Furthermore, the assembled Mn0.1Cl0.3-NVP//HC full cell delivered a high value of 94.7 mA h g−1 and lit LED bulbs, indicating its excellent application potential.
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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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SUPERCONDUCTOR SCIENCE & TECHNOLOGY
·
2025
·
IF 4.2
Kuan Li,Longfu Li,Lingyong Zeng,Yucheng Li,Rui Chen,Peifeng Yu,Kangwang Wang,Zaichen Xiang,Tian Shang,Huixia Luo
Medium/high-entropy alloys (MEAs-HEAs) and rhenium-based compounds with a non-centrosymmetric (NC) structure have received a lot of attention for offering a fertile soil in search for unconventional superconductivity. Here, five previously unreported NC Re-based MEA-HEA superconductors with an α-Mn lattice are successfully synthesized, with their superconducting transition temperatures (Tcs) ranging from 4 to 5 K. An increase in the superconducting transition temperature (Tc) can be achieved by modulating the valence electron count (VEC) through compositional adjustments. Magnetization measurements confirm that all the synthesized Re-based MEA-HEAs are bulk type-II superconductors. Specific heat analysis reveals that the superconducting state of these HEAs can be well described by a single-gap s-wave model. Our results show that the Kadowaki-Woods ratio (KWR) of these α-Mn MEA/HEA superconductors are close to the typical value of heavy fermion compounds, suggesting the existence of strong electronic correlation. These findings provide promising material platforms to study the role of high disorder in the origin of superconductivity in the NC MEAs-HEAs.
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高影响因子
Defence Technology
·
2025
·
IF 5.9
Mingcheng Ge,Xian Xu,Ze Su,Ye Zhong,Binfang Yuan,Huisheng Huang,Jianguo Zhang,Zhimin Li
Combustion catalyst is a key modifier for the performance of composite solid propellant. To exploit high-efficiency combustion catalyst, a fascinating bimetallic metal-organic framework [MnCo(EIM) 2 (DCA) 2 ] n (1) was constructed by an active dicyandiamide (DCA) linker, Mn 2+ , Co 2+ centers, and an 1-ethylimidazole (EIM) ligand. 1 possesses good thermal stability ( T p = 205 °C), high energy density ( E g = 24.34 kJ/g, E v = 35.93 kJ/cm 3 ), and insensitivity to impact and frictional stimulus. The catalytic effects of 1 contrasted to monometallic coordination compounds Mn(EIM) 4 (DCA) 2 (2) and Co(EIM) 4 (DCA) 2 (3) on the thermal decomposition of AP/RDX composite were investigated by a DSC method. The decomposition peak temperatures of AP and RDX of the composite decreased to 335.8 °Cand 206.4 °C, respectively, and the corresponding activation energy decreased by 27.3% and 43.6%, respectively, which are better than the performances of monometallic complexes 2 and 3. The gas products in the whole thermal decomposition stage of the sample were measured by TG-MS and TG-IR, and the catalytic mechanism of 1 to AP/RDX was further analyzed. This work reveal potential application of bimetallic MOFs in the composite solid propellants.
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CHEMICAL PAPERS
·
2025
·
IF 2.5
Zhao Chun-Yan,Hu Xiu-Li,Zhou Wei
Calcium looping represents a high-temperature method designed to capture CO 2 , making it appropriate for CO 2 capture from flue gases post-combustion in power plants after combustion or for integration with fuel transformation techniques in pre-combustion CO 2 sequestration systems. This method employs solid sorbents of CaO sourced from natural limestone, leveraging the chemical interaction of CaO with CO 2 , which ultimately results in the formation of CaCO 3 , thereby facilitating effective CO 2 capture. In this research, multiple metal-incorporated CaO-based sorbents were produced through the sol–gel method. Notably, the CaO-based sorbent with a Ca/Ce doping ratio of 15 demonstrates exceptional CO 2 capture ability and stability, maintaining 13.20 mmol/g of CO 2 adsorption capacity after 20 carbonation/calcination cycles. Various characterization techniques, including X-ray diffraction (XRD), N 2 physisorption, scanning electron microscopy (SEM), high-angle annular dark field scanning transmission electron microscopy/energy dispersive spectroscopy (HAADF-STEM/EDS), temperature-programmed-desorption with CO 2 (CO 2 -TPD), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) are employed to demonstrate that the presence of nanoscale CeO 2 significantly enhanced the diffusion of CO 2 during the adsorption process.
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Materials Chemistry Frontiers
·
2025
·
IF 6.4
Qianrong Jin,Yuexiao Pan,Yali Tang,Suqin Chen,Jun Zou,Yingnuo Chen
The exploration of novel phosphors with excellent properties is of great significance for both fundamental research and practical applications in optoelectronic devices. In this study, we report the synthesis of a new 0 dimensional (0D) organic-inorganic hybrid metal halide (OIHMH), C6H14N2ZnCl4, upon doping with Mn²⁺ ions, it exhibits bright green emission centered at 535 nm, originating from the d-d transition of tetrahedrally coordinated Mn²⁺ ions. The sample achieve photoluminescence quantum yields (PLQYs) of 70% at a doping concentration of 40% and demonstrate good thermal stability, with luminescence intensity restored after a heating-cooling cycle. The as-prepared Mn²⁺-doped C6H14N2ZnCl4 crystals were further utilized to fabricate white light-emitting diodes (WLEDs), which demonstrated good performance with a correlated color temperature (CCT) of 6003 K and a color rendering index (CRI) of 79. Additionally, the bright green emission of the doped crystals was explored for anti-counterfeiting applications, showing promising potential in security marking. This work highlights the potential of Mn²⁺-doped OIHHPCs as high-performance phosphors for optoelectronic applications and security purposes.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yin-Xia Sun,Li-Ping Liu,Xue Bai,Lu-Lu Gao,Wen-Qing Hu,Wen-Yu Han,Yu Sun,Zhe-Peng Deng,Wan-Hong Sun,Jian-Jun Wang,Li Xu
Developing high-sensitivity hydrogen peroxide (H 2 O 2 ) sensors is crucial. Metal organic frameworks (MOFs) are considered one of the ideal materials for developing H 2 O 2 sensors for their adjustable pore size and diverse topological structures. In this work, solvothermal synthesis is utilized CQD@Mn-MOF using carbon quantum dots (CQDs) and two-dimensional Mn-MOF ([Mn(Tib)(H 2 O) 3 ]·(TPA)·3H 2 O, Tib = 1,3,5-triamidazolylbenzene, TPA = terephthalic acid) as precursors. Interestingly, CQD@Mn-MOF as an electrochemical sensor can effectively detect H 2 O 2 with a lower detection limit of 14.7 μM, and higher sensitivity (approximately 5 times that of pure Mn-MOF). CQD@Mn-MOF sensor is capable of detecting H 2 O 2 with high selectivity in the presence of other interfering agents such as proline, ascorbic acid, glucose, and various metal salts. In addition, CQD@Mn-MOF electrochemical sensor has been used to effectively determine the H 2 O 2 content in actual beverages such as fruit juice and beer. The sensing mechanism has been reasonably analyzed that the MnO 2 produced by Mn 2+ + H 2 O 2 = MnO 2 + 2H + reaction acts as a specific catalyst for H 2 O 2 decomposition reaction (MnO 2 + H 2 O 2 + 2H + = Mn 2+ + O 2 + 2H 2 O). This sensing mechanism further ensures the high selectivity of the sensor for H 2 O 2 . Significantly, the introduction of CQD not only improves the conductivity of Mn-MOF, but also can provide more active sites in the catalytic reaction, improve the contact area and reaction rate of the reaction, and improve the catalytic performance of Mn-MOF, further improve the sensitivity.
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