JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Boying Wang,Hao Wang,Jiantao Wang,Chaolong Li,Feng Wang,Chunli Diao,Haiwu Zheng
Dielectric thin film capacitors are expected to be a promising candidate for high-performance energy storage devices due to their high power density, fast charge/discharge speed, and excellent stability. Nevertheless, it remains a challenging endeavor to develop dielectrics with excellent energy storage density comparable to that of commercial batteries. In this work, lead-free 0.8SrTiO 3 -0.2BiFeO 3 (0.8STO-0.2BFO) thin films with coexisting amorphous and nanocrystalline structure were prepared by a sol-gel method. The heat-treatment temperature was adjusted to form polar-nano regions, thereby modulate the breakdown strength and dielectric polarization, and increase the energy storage density. The electric potential, electric field, and current density of the films with different amorphous/crystalline volume fractions were evaluated by the finite element simulation to further verify that the proper crystallization can result in the improved polarization performance and increased breakdown strength of the films, which are beneficial to the enhancement of energy storage performance. Through structural tailoring, the 0.8STO-0.2BFO film annealed at 550 °C demonstrates the optimal energy storage properties with a giant discharge energy storage density of 65 J/cm 3 and high efficiency of 75% at room temperature. Simultaneously, a broad temperature stability (20–160 °C), superb operating frequency stability (20 Hz-2 kHz), and excellent fatigue endurance (6.3 ×10 5 ) are observed without appreciable degradation of the energy storage performance. The excellent energy storage performance indicates a widespread potential of 0.8STO-0.2BFO films in pulse power applications, such as consumer electronics, microelectronics, and medical devices .
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Materials
·
2019
·Vol. 12
·期 22
·3654
·
IF 2.972
Mingxuan Ma,Xiaoyu Ma,Suping Cui,Tingting Liu,Yingliang Tian,Yali Wang
A series of MCM-41 molecular sieves with different molar ratio of template to silicon were synthesized through hydrothermal synthesis method by using cetyltrimethylammonium bromide (CTAB) as the template, diatomite as the silicon source. By using impregnation method, the Mn-Ce/MCM-41 SCR molecular sieve-based catalysts were prepared. The results observed that when the molar ratio of template to silicon was 0.2:1, the MCM-41 as catalyst carrier has the highest surface area and largest pore volume, it also presented typically ordered hexagonal arrays of uniform channels. The denitration catalytic material based on this carrier has a high number of Lewis acidic sites, and the denitration efficiency can reach more than 93%.
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JOURNAL OF COORDINATION CHEMISTRY
·
2012
·
IF 1.547
Li Zhang,Xiu-Ling Wu,An-Qi Wang,Fei Qin,Da-Wei Meng,Xiao-Yang Liu
A manganese(II) coordination polymer [Mn(TMB)2 · H2O]
n
(1) (HTMB = 3,4,5-trimethoxybenzoic acid) has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, powder X-ray diffraction analysis, spectroscopic (IR, solid state UV-Vis), and thermal methods. The crystal belongs to orthorhombic system, space group P212121, with cell parameters a = 7.3001(8), b = 11.4146(13), c = 27.053(3) Å, α = β = γ = 90°, V = 2254.3(4) Å3, Z = 4. In 1, TMB in two different coordination modes bridges six-coordinate manganese(II) centers forming a 1-D infinite chain coordination framework. The spectral and thermal properties of the complexes have also been studied.
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Sustainable Energy & Fuels
·
2024
·Vol. 8
·期 23
·5524-5534
·
IF 5
Yihong Zhu,Juping Zhang,Dongfang Li,Tao Zhu,Xing Zhu
Chemical looping dry reforming of methane (CL-DRM) is an efficient pathway for the conversion of methane and CO2 into synthesis gas ready for the Fischer–Tropsch process, which largely depends on the redox behavior of oxygen carriers. Perovskite-structured metal oxides are promising candidates for CL-DRM due to the structural diversity brought about by elemental doping. Herein, we proposed to fabricate a highly active oxygen carrier via functionally designed Mn-based perovskite oxides via polymetallic doping. Cu-doping in the B-site of SrMnO3−δ reveals a significant anti-coking effect in the high-temperature continuous CH4/CO2 redox process. Ni-doping in the B-site boosts the performance of methane activation resulting in high methane conversion. Moreover, Ce-doping in the A-site elevates oxygen migration and enhances partial oxidation of methane to H2 and CO as well as the re-oxidation of reduced perovskite oxides. Considering the roles of Cu, Ni and Ce doping of SrMnO3−δ, a polymetallic-doped perovskite of Sr0.8Ce0.2Mn0.7Cu0.1Ni0.2O3−δ was synthesized and evaluated in CL-DRM. The optimized perovskite oxide demonstrated exceptional performance with a methane conversion of 85% and a CO selectivity of 93% throughout 30 redox cycles at 850 °C. In the redox reactions, the transition metals of Mn, Cu, and Ni agglomerated during the reduction but could return to a well-dispersed state after re-oxidization with CO2. The perovskite oxide exhibits self-structural-regenerability and the nano-scale agglomeration–dispersion cycle ensures the high structural stability of the material in the successive CL-DRM cycles. This study provides an important insight into the regulation of catalytic activity, oxygen mobility and carbon-resistance via doping of perovskite oxides with various kinds of compatible elements in both A and B sites.
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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Shiyuan Zhu,Peng Liu,Qiongyu Zhou,Qianjun Deng,Yuanyuan Li,Jiacheng Wang,Zuo He,Changchun Tian,Xiaofen Wang
Zn coating is a typical anti-corrosion coating for carbon steel. Considering the sacrificial nature of Zn coating, it is essential to enhance the corrosion resistance for the long-term performance in the practical application. In this work, two-dimensional carbon nanoplatelets (2D-CNs) with nanometer thickness (∼100 nm) and ultra-large lateral size (10–40 μm) and Mn element have been successfully co-deposited with Zn onto low carbon steel by a simple electrodeposition method. Results show that the Zn-Mn/2D-CNs composite coating is composed of Zn phase, ZnMn 3 phase and a small number of 2D-CNs. The Zn-Mn/2D-CNs composite coating exhibits a modified surface quality with ultrafine grains and smaller roughness (Ra = 176 nm, Rq = 131 nm) when compared with that of Zn coatings (Ra = 798 nm, Rq = 684 nm). Besides, the inert 2D-CNs within the composite coating can act as the corrosion barriers. Therefore, the Zn-Mn/2D-CNs composite coating has excellent anti-corrosion performance, owning the lowest corrosion current densities i corr (9.2 μA cm −2 ) and maximum coating resistance R coat (1.2 kΩ·cm −2 ) and charge transfer resistance R ct (3.5 kΩ·cm −2 ), associated with its modified microstructure, Mn element with passivation property, and 2D-CNs barriers. These results demonstrate the desirable potentiality of inert 2D carbon materials in the electrodeposition of Zn-based coating for improving the corrosion resistance.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yuyao Zhang,Tianyi Gao,Jiameng Yu,Yining Zhang,Yue Zhang,Shaojie Chen,Ning Xue,Xinshui Zhang,Qiong Yuan,Luyao Wang,Wei Liu
As a promising solid electrolyte, the NASICON-type Na3Zr2Si2PO12 holds excellent application in solid-state sodium-ion batteries, which are an alternative to lithium batteries. However, its insufficient conductivity is one of the key factors impeding its applications. Herein, we report Mn2+-doped Na3Zr2Si2PO12, demonstrating enhanced ionic conductivity and electrochemical properties. We systematically investigate the effect of doping content on the ionic conductivity. The results show that Na3.4Zr1.8Mn0.2Si2PO12 has an extremely high room-temperature ionic conductivity of 3.3 mS cm–1, which is 4 times that of undoped Na3Zr2Si2PO12. According to the Meyer–Nedle rule, it can be known that as the activation energy decreases, the ionic conductivity shows a gradually increasing trend. Additionally, the Na symmetric batteries using Mn2+-doped Na3Zr2Si2PO12 exhibit improved cycling performance. The quasi-solid-state sodium–metal battery using Na3V2(PO4)3 achieves a high discharge specific capacity of 91.3 mAh g–1 at 0.1C, with a high capacity retention of 92.2% after 260 cycles, far surpassing the counterpart based on undoped Na3Zr2Si2PO12. This work provides an effective strategy for enhancing the performance of Na3Zr2Si2PO12 for its application in sodium–metal batteries.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 5
·2725-2737
·
IF 1.938
Zhou Junxiu,Wu Tianhao,Han Yinghui,Aryana Saman
Manganese and cerium (Mn-Ce) oxides were prepared under nitrogen and high-temperature oxidation via a bath precipitation method as materials for electrode assemblies in supercapacitors. The prepared Mn-Ce oxide composite was demonstrated to have a high specific capacitance of 163.7 F g −1 with 78.4% cyclic stability after 3000 cycles at a current density of 1 A g −1 . Electrochemical impedance spectroscopy confirms that MnO 2 improves the conductivity of CeO 2 . Results from XPS analysis suggest that the introduction of MnO 2 enhances the concentrations of oxygen vacancies. Finally, band structure, density of states and Mulliken population were calculated using density functional theory, and the findings are consistent with the experimental and characterization results. Because of their excellent performances, Mn-Ce bimetallic oxides are promising electrode materials for supercapacitors. Graphic Abstract
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Huixian Xie,Liping Tan,Zhuo Yao,Jiaxiang Cui,Xiaokai Ding,Zuhao Zhang,Dong Luo,Zhan Lin
Li-rich Mn-based layered oxides are proposed to be candidates for high-energy Li-ion batteries. However, their large-scale production is still hampered by poor rate capability and severe voltage decay. It was mainly attributed to the irreversible oxygen loss, which induces transition metal ion migration, electrolyte consumption, and structural evolution. Herein, we propose an effective strategy of phosphorylation, in which the phosphate ion is induced to remove the surface labile oxygen. It urges the Li2MnO3 component to transform to the spinel-like structure and promotes the anionic redox process, thus facilitating lithium-ion diffusion and improving structural stability. As a result, the Li2MnO3 component is more prone to be activated, with the capacity increased by 18% in comparison with the pristine one. It also exhibits a superior capacity retention of 86.1% after 150 extended cycles and better rate performance delivering a capacity of 148.1 mA h g–1 even at 10 C. The effective phosphorylation opens a new way to tune anion redox chemistry and obtain structurally stable materials.
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高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-11
·
IF 14.919
Zuo Wenhua,Liu Xiangsi,Qiu Jimin,Zhang Dexin,Xiao Zhumei,Xie Jisheng,Ren Fucheng,Wang Jinming,Li Yixiao,Ortiz Gregorio F.,Wen Wen,Wu Shunqing,Wang Ming-Sheng,Fu Riqiang,Yang Yong
Layered transition metal oxides are the most important cathode materials for Li/Na/K ion batteries. Suppressing undesirable phase transformations during charge-discharge processes is a critical and fundamental challenge towards the rational design of high-performance layered oxide cathodes. Here we report a shale-like Na x MnO 2 (S-NMO) electrode that is derived from a simple but effective water-mediated strategy. This strategy expands the Na + layer spacings of P2-type Na 0.67 MnO 2 and transforms the particles into accordion-like morphology. Therefore, the S-NMO electrode exhibits improved Na + mobility and near-zero-strain property during charge-discharge processes, which leads to outstanding rate capability (100 mAh g −1 at the operation time of 6 min) and cycling stability (>3000 cycles). In addition, the water-mediated strategy is feasible to other layered sodium oxides and the obtained S-NMO electrode has an excellent tolerance to humidity. This work demonstrates that engineering the spacings of alkali-metal layer is an effective strategy to stabilize the structure of layered transition metal oxides.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Jiajia Chen,Baobao Bai,Juan Lei,Peng Wang,Shuang Wang,Jinping Li
Mn 3 O 4 catalysts have shown great potentials for toluene catalytic oxidation for the spinel structure and weak metal oxygen bonds. In this work, Mn 3 O 4 and Mn 2 O 3 catalysts were obtained by using Mn-MOFs with different ligands as precursors. It was found that the reduction of hydroxyl groups in 2,5-dihydroxyterephthalic acid was favorable for the preparation of Mn 3 O 4 under the proper temperature range. The Mn 3 O 4 -MOF-74–300 catalyst exposed the highest Mn 3+ , O ads /O latt and reducing capacity. Herein, the Mn 3 O 4 -MOFs-74–300 catalyst exhibited excellent performance for toluene oxidation, which could achieve 90% toluene conversion at 218 ℃ (toluene concentration = 1000 ppm and SV = 20000 mL·g −1 ·h −1 ). Moreover, the Mn 3 O 4 -MOFs-74–300 catalyst exhibited high stability, circulation performance and water resistance in the catalytic test.
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ACS Nano
·
2025
·
IF 16
Shunli He,Robert Scott Young,Xing Shen,Miao Han,Yaoguang Song,Wenyi Dong,Yiming Zhang,Jili Yue,Jingfeng Wang,Rhodri Jervis,Junmei Zhao,Alexander J. E. Rettie
Mn-based layered oxides are promising cathode materials for sodium-ion batteries (SIBs) due to their high capacity and cost-effectiveness. However, their practical application is often hindered by structural instability and Jahn–Teller distortion associated with Mn3+. Herein, an ionic-potential-guided metal-fluoride engineering strategy is proposed to address these challenges by coincorporating AlF3 with transition-metal vacancies into a P2-type Mn-based layered oxide (Na0.76Ni0.225Al0.0167Mn0.75O1.95F0.05). This dual-site tuning elevates total ionic potential from 15.37 to 15.61 by simultaneously enhancing the cationic potential and reducing the anionic contribution, thereby promoting interlayer stability and suppressing Jahn–Teller effects. Multiscale characterization and density functional theory calculations reveal a reversible, solid-solution Na+ (de)intercalation mechanism with a negligible lattice strain (∼0.15%) and suppressed Mn3+ formation. The optimized cathode delivers an average voltage of ≈3.60 V within 2.0 to 4.3 V range, a reversible capacity of 134 mA h g–1, and 83% capacity retention after 100 cycles (2.0–4.3 V, 1C). In contrast, the pristine counterpart shows a lower average voltage of 3.32 V and a rapid capacity drop to ∼50 mA h g–1 by the second cycle. These findings establish the ionic-potential-guided AlF3 incorporation as a robust and scalable strategy for designing highly reversible, high-voltage, and long-life cathodes for next-generation SIBs.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Lin Wang,Yue Wang,Xiao-Jie Shi,Tian-Shun Song,Xiang-Ling Li,Jing-Jing Xie
Background Rapid, low-cost measurement of glutathione (GSH) is valuable for judging food freshness. However, many colorimetric assays depend on natural enzymes or added H 2 O 2 , which limits stability and use in real samples. Results We developed a manganese single-atom enzyme (Mn/SAE) with intrinsic oxidase-like activity to build an enzyme-free, H 2 O 2 -free colorimetric system for GSH. Mn/SAE uses dissolved O 2 to oxidize TMB to blue oxTMB; GSH reduces oxTMB back to TMB, producing a decrease in color and absorbance for readout. Under optimized conditions, both the solution assay and a paper-based analytical device (PAD) provide results within 10 min using smartphone R-channel quantification. The method shows good selectivity and performs well in real samples, tracking the expected decline of GSH in strawberries during storage. Significance This simple, low-cost, and portable approach enables on-site GSH analysis without enzymes or H 2 O 2 . The Mn/SAE colorimetric system offers practical value for freshness monitoring and can be adapted to other redox biomarkers in food-quality assessment.
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