DALTON TRANSACTIONS
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2025
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IF 3.3
Kang Wang,Chao Fan,Ruihang Hu,Chen Sun,Yan-Qin Wang
During conventional water electrolysis for hydrogen production, the high theoretical potential of the oxygen evolution reaction (OER) leads to excessive energy consumption. In contrast, the urea oxidation reaction (UOR), with its significantly lower theoretical potential, has attracted considerable attention as an energy-efficient alternative for hydrogen production. In this study, we develop a Ni-doped Mn MOF-74 catalyst Ni-Mn MOF-74 supported on carbon cloth (CC), exhibiting a unique bud-like architecture featuring a petal-surrounded pistil morphology, which exhibits excellent UOR performance in alkaline medium. This catalyst achieves a current density of 100 mA cm-2 at an ultralow potential of 1.40 V (vs. RHE) in 1.0 M KOH + 0.5 M urea electrolyte while maintaining remarkable stability. Importantly, in a urea-assisted hydrogen production electrolyzer composed of Ni-Mn MOF-74 (anode) and Pt/C (cathode), the system delivers a current density of 100 mA cm⁻² at a cell voltage of only 1.49 V in alkaline freshwater and 1.50 V in alkaline seawater, respectively, while remaining excellent stability. The enhanced UOR activity stems from Ni doping, which effectively modulates the catalyst's morphology and electronic structure, the synergism of Ni and Mn strengthening the adsorption of urea molecule and OH- ion, thereby accelerating urea decomposition kinetics.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
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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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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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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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ADVANCED MATERIALS
·
2025
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IF 26.8
Maolin Yang,Tingting Yang,Mingjie Dong,Zhongyuan Huang,Yuguang Pu,Lei Jin,Rui Wang,Yuxi Luo,Tao Zeng,Yonglin Tang,Jun Chen,Rafal E. Dunin-Borkowski,Ziwei Chen,Yu Qiao,Yinguo Xiao
Mn-rich layered oxides (MRLOs) are promising low-cost cathode materials for sustainable sodium-ion batteries (SIBs). However, the low Mn 4+ /Mn 3+ redox potential limits their energy densities, and the Jahn-Teller distortion that occurs surrounding Mn 3+ at low voltages destabilizes the structure. Additionally, complex ordered structures inherently present in MRLOs hinder Na + migration. In this study, new types of cation ordering structures are discovered in common MRLOs. By regulating oxygen vacancy formation, the transition from short-range to long-range cation ordering is disrupted, effectively mitigating cooperative Jahn-Teller distortion and achieving a 95.3% capacity retention over 1 000 cycles at 8 C. The maximum entropy method (MEM) analysis is performed based on neutron diffraction data, which visualizes significantly optimized Na + diffusion pathways in long-range disordered cathode with enhanced Na + diffusion kinetics. Furthermore, the formation of oxygen vacancy elevates the Mn 4+ /Mn 3+ redox potential, resulting in a competitive energy density of 626 Wh kg −1 within 1.5–4.5 V in a half-cell configuration. This work offers a multiscale approach to precise elucidation of the cathode crystal structure and provides a feasible pathway to optimize sodium-ion cathodes by disrupting long-range cation ordering, ultimately facilitating substantial improvements in electrochemical performance.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Kui Yan,Ruixin Chen,Qi Ling,Ziwei Zhao,Zihan Zhou,Xuan Li,Jianguo Lv,Chunbin Cao,Gang He,Zhaoqi Sun,Miao Zhang
This research presents an innovative approach to the in-situ fabrication of Mn-doped NiFe 2 O 4 (Mn-NiFe 2 O 4 ) nanosheet arrays directly on nickel foam substrates. The formation of precursors on the nickel foam substrates is achieved through spontaneous corrosion, followed by a thermal treatment to form the Mn-NiFe 2 O 4 nanosheet arrays. The material's structure and morphology were thoroughly examined, revealing that the addition of Mn transforms the nanoporous structure on the nickel foam into a nanosheet structure. The average thickness of the nanosheets is 30 nm, and their primary composition is Mn-doped NiFe 2 O 4 . The resulting highly porous structure of these nanosheets provides numerous active sites and effective electron and ion diffusion channels, thereby increasing charge density and mechanical stability. Electrochemical assays show that the areal-specific capacity of the synthesized electrode material reaches 4.34 C cm −2 (areal-specific capacitance is 8.68 F cm −2 ) at 1 mA cm −2 . Notably, the constructed hybrid supercapacitor achieves a power density of 544 µW cm −2 at an energy density of 390 µWh cm −2 . Furthermore, capacitance retention is 95.2% after 5000 charging cycles. Additionally, the assembled device delivers robust and sustained energy output for LED displays and electric toy cars. This method streamlines the production flow of electrode materials, reducing energy consumption while significantly enhancing the areal capacitance of supercapacitors. The assembled hybrid supercapacitor structure diagram and the assembled devices provide power sources for electric toy cars and LED displays.
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高影响因子
Journal of Materials Chemistry A
·
2025
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IF 9.5
Dongwei Zhou,Shihao Wang,Jiansen Wen,Jie Mei,Guiyang Gao,Saichao Li,Baisheng Sa,Jie Lin,Laisen Wang,Guoying Wei,Dong-Liang Peng,Qingshui Xie
Li-rich Mn-based cathode materials, single-solvent, nonflammable feature, high voltage stability, solvation structure
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高影响因子
Molecular Catalysis
·
2025
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IF 4.9
Rui Zhu,Fang Gao,Xinglong Li
The development of efficient catalysts for the stepwise oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformyl furan (DFF), 5-hydroxymethyl-2-furancarboxylic acid (HMFCA), 5-Formyl-2-furancarboxylic acid (FFCA) or 2,5-furandicarboxylic acid (FDCA) is critical for biomass valorization. Herein, we reported a bimetallic Co-Mn catalyst anchored on nitrogen-doped porous carbon, which was used for the oxidation of HMF to FDCA, avoiding the use of high temperature and high-pressure oxygen. High FDCA selectivity (>95 %) was achieved through reaction condition optimization. And HMF→DFF→FFCA→FDCA was considered to be the main reaction pathway during the whole oxidation process. Additionally, the chemical environment of the constituent elements of the used catalyst was analyzed by XPS. TEM revealed that the catalyst retained its porous structure and excellent metal dispersion after the reaction. This structural stability was corroborated by sustained >90 % FDCA selectivity over five consecutive reaction cycles. This work established a dual-metal synergy strategy for multi-step oxidation pathways, offering insights into the design of robust catalysts for biomass-derived platform molecule upgrading.
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高影响因子
CATALYSIS TODAY
·
2024
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IF 5.2
Xiaoyu Zhang,Xin Xu,Xinyu Wang,Huibin Liu,Mingli Fu
The improvement of catalytic efficiency is of great significance to the removal of volatile organic compounds (VOCs), a class of key air pollutants leading to ground-level ozone pollution. Herein, a series of micro-spherical Ca-Mn mixed oxides (Ca x Mn y O z ), namely CaMn 3 O 6 , Ca 2 Mn 3 O 8 and CaMnO 3 , were prepared by a two-step precipitation method, and defects were constructed on which by selective dissolution to enhance the low-temperature catalytic performance in the oxidation of propane (C 3 H 8 ) as a representative short-chain alkane VOCs. The synthesized Ca x Mn y O z oxides demonstrated drastically different response to the dissolution modification initiated by acid treatment. Specifically, after acid dissolution, while CaMn 3 O 6 and Ca 2 Mn 3 O 8 maintained largely their original structures, the perovskite-type CaMnO 3 underwent lattice rearrangement and was transformed into γ-MnO 2 -like product with only a tiny amount of Ca. In C 3 H 8 oxidation, the catalytic performance of CaMnO 3 was significantly improved after selective dissolution, as indicated by a significant decrease of T 90 , i.e. the temperature to achieve 90% C 3 H 8 conversion, from 455 °C to 240 °C. Mechanistic investigation by in-depth X-ray photoelectron spectroscopy studies revealed that selective dissolution led to higher Mn 4+ concentrations and more oxygen vacancies on the oxide surfaces, thus facilitated electron transfer and O 2 activation in C 3 H 8 oxidation reactions. This study paves a new path for the design of cost-effective oxide catalysts toward the abatement of short-chain alkane VOCs.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2024
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IF 3.2
Dapeng Li,Jinqiang Wu,Jiangtao Duan,Xiaoxu Liu,Jingjing Gong,Suxiang Ge
Exploring the practical method to grow high quality metal phthalocyanine (MPc) crystals and understanding their growth mechanism is significant for their applications. In this study, manganese phthalocyanine (MnPc) crystals were successfully synthesized using simple substance Mn and dicyanobenzene in the reaction medium of ethanediol without any other chemical reagents. The well shaped quadrangular MnPc crystals more than 500 μm were in situ grown on Mn slice surfaces via a simple solvothermal reaction. XPS analyses show that Mn has the mixed chemical state of +3 and + 4 in MnPc. Ethanediol acted as not only the solvent but also acidic catalyst to boost the ionization of dicyanobenzene. Different from the reported synthesis of MPc crystals, MnPc crystals could be formed at a wide temperature range of 100–190 °C. The reaction time is the only experimental parameter to regulate the crystal growth. To the best of our knowledge, this is the first report on in situ synthesis of the high quality MnPc crystals on Mn substrate by using a simple solvothermal method.
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高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Xinli Wu,Weichao Qi,Hong Zhu,Yuhui Dong,Aocheng Jiang,Huanyang Chen,Hongtan Huang,Lu Han,Yousheng Zou
CsPbX 3 (X = Cl, Br, I) perovskites have been recognized as ideal candidates for light-emitting device applications due to their excellent optoelectronic properties, but the toxicity of lead has raised significant environmental concerns. Mn doping in lead-based perovskite nanocrystals (NCs) has been conducted to mitigate lead toxicity risks while enhancing photoluminescent performance. While high Mn concentrations can increase Mn–Mn defect states, complicating the balance between high photoluminescence quantum yield (PLQY) and low lead. In this study, a PLQY of 85.8% was achieved by precisely controlling the Mn/Pb feed ratio at a concentration of 11.37%. The enhancement in PLQY is attributed to reduced Cl vacancies, which lower defect states and non-radiative recombination rates. Stability was also improved through doping, and white light emitting diode (WLED) utilizing these materials exhibited color coordinates (0.3379, 0.3479) that closely approximate standard white light emission. This work provides a solution for achieving high-quality Mn 2+ doped perovskite NCs, and highlights its potential in solid-state lighting solutions while addressing lead toxicity concerns.
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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Ning-Ya Wang,Yi-Hong Liu,Xiao-Jie Jiang,Hui-Li Guo,Li-Xiao Wang,Bei-Bei Li,Xue Liu,Xiao-Bo Zheng,Jing-Yu Pang,Dong-Bin Dang,Yan Bai
The catalytic activity of single-atom catalysts (SACs) is strongly influenced by their local coordination environment. In this study, a series of Mn-N-C SACs with tunable coordination structures were synthesized via pyrolysis of Mn-doped metal-organic frameworks (MOFs) at different temperatures. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption spectroscopy (XANES and EXAFS) confirmed the atomic dispersion of Mn and the formation of Mn-N 4 moieties as the active sites. Among the catalysts, Mn-NC-1000°C with high Pyridine-N content exhibited the best performance, achieving a maximum Faradaic efficiency (FE) of 94.9% for CO at –0.47 V vs. RHE in an H-type cell, along with a current density of ∼15 mA . cm −2 . And in a flow cell, the current density increased significantly to ∼100 mA . cm −2 while maintaining high CO selectivity (FE CO =95%) and operational stability (24 h). The density functional theory (DFT) studies further reveal that the Mn-NC-1000°C with high Pyridine-N content effectively reduces the reaction barriers for the formation of *COOH and thus accelerates the reduction of CO 2 .This work provides a controllable strategy for regulating the coordination microenvironment of SACs and offers valuable insights for the development of efficient CO 2 electroreduction system.
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高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Lili Song,Chunlian Peng,Fan Yang,Lian Wang,Yinhua Jiang,Yuqiao Wang
The charge transport between layers of layered double hydroxide (LDH) with structural stability is generally considered as a key factor in restricting electrochemical performances. Herein, we report the surface spatial confinement effect on Mn–Co LDH@carbon dots (CDs) to enhance charge transfer and the stable structure for high-performance supercapacitors. The surface confined effect should be characterized as the charge transfer and interaction between Mn–Co LDH and CDs using density functional theory calculations. CDs can improve the density of states near the Fermi level to achieve an enhanced conductivity. The geometric structure can remain stable at room temperature within 200 fs by using ab initio molecular dynamics simulations. The two-electrode device gained the energy density of 79 W h kg–1 and a power density of 666 W kg–1 at 1 A g–1. This design concept will help to design, prepare, and assemble the high-efficiency and long-lifetime electrochemical energy storage devices based on various layered materials.
研究领域:
材料科学
·
电化学
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