JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 10
·5723-5734
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IF 3.9
Yi Zhong,Yun Wang,Zhenliang Yang,Bingqing Li,Jingkun Xu,Zhiyi Wang,Liang Xie,Limei Duan,Fengyun Hu,Mingfu Chu,Rui Gao,Pengcheng Zhang,Bin Bai
In this work, the sintering kinetics of pure UO 2 and 0.5 wt.%MnO-doped UO 2 was studied by a high-temperature dilatometer heated up to 1500°C. In addition, the sintering behavior of pure UO 2 and 0.5 wt.%MnO-doped UO 2 was studied by pressureless sintering technique. The results showed that MnO doping enhanced the grain boundary diffusion of UO 2 , which can effectively decrease the densification temperature and promote grain growth. The sintering temperature of UO 2 was significantly reduced by about 200°C with the addition of 0.5 wt.%MnO. The microscopic morphology studies showed that there were still fine particles agglomerated, forming sintered spheres in the matrix even if no severe agglomeration and bimodal size distribution were observed in raw UO 2 powder. The microstructure evolution of the sintered sphere and UO 2 matrix during the densification process was studied by isothermal sintering. Finally, the present analyses indicated that the densification of UO 2 matrix can be accelerated by adding MnO or increasing the sintering temperature, thus improving the densification inhomogeneity of UO 2 matrix.
研究领域:
材料科学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chao Zhang,Yi Wang,Yi-Lin Liu,Qingming Zeng,Yanjun Wen,Lulin Guo,Haodong Chen,Xinyi Xie,Qingyi Zeng
An innovative MnO/Ti 3 C 2 MXene heterostructure, consisting of three-dimensional (3D) MnO nanosheet array directly assembled on two-dimensional (2D) Ti 3 C 2 MXene nanosheets, was synthesized via a simple hydrothermal-annealing strategy for uranium elimination. This unique 3D/2D heterostructure derived substantially high specific surface area (311.9 m 2 /g) and exposed considerable amount of surface oxygen groups, including surface lattice M–O and adsorbed –OH. Through a comprehensive exploration encompassing adsorbent dosage, pH, ionic strength, initial U(VI) concentration, and environmental conditions, the MnO/Ti 3 C 2 MXene heterostructure demonstrated an extraordinary proficiency and specificity in the removal of U(VI). This composite exhibited an outstanding adsorption capacity of 862.1 mg/g, with a removal efficiency of 99.7 % and rapid kinetics (above 90 % within 20 s). The kinetic study indicated the adsorption process followed chemisorption dynamics and single-layer adsorption behavior. Comprehensive analyses validated the structural integrity and confirmed the successful uranium adsorption via strong interaction between UO 2 2+ and surface unsaturated oxygen groups. Notably, the MnO/Ti 3 C 2 MXene maintained excellent recyclability, highlighting its potential for large-scale applications. It emerges as a promising candidate for uranium removal, offering insights for optimizing composite materials in diverse environmental conditions and fostering advancements in water purification technologies.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 7
·3536-3544
·
IF 2.371
Zhang Qingtang,Wang Wenwen,Jiang Deqiang,Huang Xiaobing
Mesoporous activated carbon decorated with MnO (MnO/MAC hybrid) was prepared by pyrolysing Mn(CH 3 COO) 2 adsorbed MAC. XRD result proves that typical MnO crystals exist in the MnO/MAC hybrid. The SEM analysis indicates that a lot of pores on the surface of MAC have been filled by MnO. BET result reveals that some pores of MAC are filled by MnO and the MnO/MAC hybrid is a typical mesoporous material. This novel structure ensures the hybrid possesses excellent electrochemical performance. MnO/MAC hybrid delivers a high initial discharge capacity of 1086.1 mAh g −1 and a reversible charge capacity of 600.6 mAh g −1 . In addition, MnO/MAC hybrid also exhibits excellent rate performance and cycling performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Fuyu Chen,Changqing Xiong,Xiangdong Cheng,Ying Shi,Hui Chen,Qinfang Zhang
The electrode is crucial for electrochemical reactions, significantly impacting the vanadium flow battery (VFB) performance. However, their relatively low electrochemical activity remains a major obstacle to developing high-performance VFBs. To overcome this limitation, we introduce a catalyst synthesized by integrating pore-forming agents─specifically, poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) triblock copolymer (P123) and polyoxyethylene–polyoxyethylene–polyoxyethylene triblock copolymer (F127)─into MnO@C derived from a metal–organic framework. This study marks the first application of such an approach to VFB enhancement. A comprehensive analysis is conducted to examine the catalyst’s morphology, composition, electrocatalytic activity, and charge–discharge behavior. The results reveal that (i) the prepared catalysts possess a nanoporous structure with MnO nanoparticles uniformly dispersed in amorphous carbon; (ii) pore-forming agent-modified MnO@C, especially P123–MnO@C, exhibits a large specific surface area, an abundance of oxygen-containing functional groups, and exceptional electrochemical activities; (iii) it enhances the energy efficiency of VFBs by 5.7% compared to those utilizing raw carbon felts and by 5.1% over those with MnO@C electrodes at 100 mA cm–2; and (iv) it significantly improves operating voltages, cell capacities, high current density properties, and cycling performance. Thus, this study proposes an innovative electrochemical catalyst for VFBs, enhancing performance and advancing renewable energy storage solutions.
研究领域:
电化学
·
储能
·
纳米材料
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催化
·
电池技术
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产品关联
DOI
高影响因子
Advanced Science
·
2018
·Vol. 6
·期 1
·1801182
·
IF 12.441
Zao Wang,Feng Gong,Ling Zhang,Rui Wang,Lei Ji,Qian Liu,Yonglan Luo,Haoran Guo,Yuehui Li,Peng Gao,Xifeng Shi,Baihai Li,Bo Tang,Xuping Sun
NH 3 is a valuable chemical with a wide range of applications, but the conventional Haber–Bosch process for industrial-scale NH 3 production is highly energy-intensive with serious greenhouse gas emission. Electrochemical reduction offers an environmentally benign and sustainable route to convert N 2 to NH 3 at ambient conditions, but its efficiency depends greatly on identifying earth-abundant catalysts with high activity for the N 2 reduction reaction. Here, it is reported that MnO particles act as a highly active catalyst for electrocatalytic hydrogenation of N 2 to NH 3 with excellent selectivity. In 0.1 m Na 2 SO 4 , this catalyst achieves a high Faradaic efficiency up to 8.02% and a NH 3 yield of 1.11 × 10 −10 mol s −1 cm −2 at −0.39 V versus reversible hydrogen electrode, with great electrochemical and structural stability. On the basis of density functional theory calculations, MnO (200) surface has a smaller adsorption energy toward N than that of H with the *N 2 → *N 2 H transformation being the potential-determining step in the nitrogen reduction reaction.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 9
·3029-3039
·
IF 7.059
Peitao Xie,Yifan Li,Qing Hou,Kunyan Sui,Chunzhao Liu,Xueyan Fu,Jiaoxia Zhang,Vignesh Murugadoss,Jincheng Fan,Yanpeng Wang,Runhua Fan,Zhanhu Guo
One-dimensional wires are the most common building blocks in metamaterials. In this study, zero-dimensional nanoparticles connected by tunneling networks were used to construct metamaterials, thus providing a more flexible alternative for designing the geometrical configuration of metamaterials, particularly in nanodevices. The composites with nickel nanoparticles@MnO were prepared by a bio-gel derived strategy. Nickel nanoparticles were not connected geometrically, but the conductive network had been already formed, which was a tunneling-dominated percolative phenomenon demonstrated by the first-principles calculation. Negative permittivity was achieved in the composites, as the low-frequency plasmonic state could be generated in the tunneling nickel-networks. At the same time, negative susceptibility was observed due to the diamagnetism of the tunneling current loops. Electromagnetic simulations indicate that the composites have the potential for electromagnetic shielding (only 0.25 mm in thickness). It is believed that this study not only fills up the research gap in the influence of the tunneling effect on negative electromagnetic parameters but also opens up another way of preparing metamaterials by using zero-dimensional nanoparticles instead of one-dimensional wires.
研究领域:
材料科学
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电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Jian Pan,Junchao Qian,Zhengying Wu,Chengbao Liu,Yiyang Liu,Yucheng Qian
The increasing demand for power storage device with high energy density forces the scientists to design new materials as electrodes. In this work, hollyhock stalks were converted into porous carbon host for growth of MnO and CeO 2 nanocrystals hydrothermally. The obtained biocarbon with macro-meso-micro porous structure provides excellent electron transport properties, while the nano-size MnO-CeO2 (<10 nm) on it grants high capacitance. Due to the unique nanostructure of carbon skeleton and ultra-large surface areas (514.4 m 2 g −1 ), the MnO-CeO 2 nanocrystals/porous carbon displays excellent electrochemical capacitance performance (162 F·g −1 at 0.5 A·g −1 ) and cycle stability. The specific capacity remains 99.3% efficiency after 1000 cycles at 500 mA·g −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Sinan Zheng,Zhihui Zeng,Jing Qiao,Yue Liu,Jiurong Liu
The C/MnO/Co nanocomposite fibers were prepared via a facile electrospinning and subsequent carbonization process. Co acting as the magnetic nanoparticles and MnO nanoparticles serving as impedance modulator were introduced, effectively inhibiting the agglomeration of carbon fibers during annealing. This optimizes the microstructure and significantly improves the microwave absorption performance of the nanocomposites with diameters of 250–350 nm and rough surface morphologies . The nanocomposite fibers with equal MnO and Co molar contents exhibited the minimum reflection loss of − 71.7 dB at a frequency of 14.1 GHz and an absorber thickness of 2.3 mm, and the effective absorption bandwidth reached at 6.3 GHz at a thickness of 2.6 mm. The high microwave absorption performance can be attributed to the synergistic coactions of conduction loss, magnetic loss, interfacial polarization, and multiple scatterings derived from the rational design of the constituents and microstructure of the nanocomposites.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 12
·1676
·
IF 4.034
Pianpian Ma,Na Lei,Bo Yu,Yongkun Liu,Guohua Jiang,Jianming Dai,Shuhong Li,Qiuling Lu
La-based perovskite-type oxide is a new type of supercapacitor electrode material with great potential. In the present study, LaMnO3/MnO (LMO/MnO) nano-arrays supported by carbon cloth are prepared via a simple one-step electrodeposition as flexible supercapacitor electrodes. The structure, deposit morphology of LMO/MnO, and the corresponding electrochemical properties have been investigated in detail. Carbon cloth-supported LMO/MnO electrode exhibits a specific capacitance of 260 F·g−1at a current density of 0.5 A·g−1in 0.5 M Na2SO4aqueous electrolyte solution. The cooperative effects of LMO and MnO, as well as the uniform nano-array morphology contribute to the good electrochemical performance. In addition, a symmetric supercapacitor with a wide voltage window of 2 V is fabricated, showing a high energy density of 28.15 Wh·kg−1at a power density of 745 W·kg−1. The specific capacitance drops to 65% retention after the first 500 cycles due to the element leaching effect and partial flaking of LMO/MnO, yet remains stable until 5000 cycles. It is the first time that La-based perovskite has been exploited for flexible supercapacitor applications, and further optimization is expected.Keywords:perovskite-type LaMnO3/MnO;supercapacitor flexible electrode;electrochemical properties;carbon cloth;electrodeposition
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Healthcare Materials
·
2025
·
IF 9.6
Hua Chai,Renpeng Xia,Nan Ouyang,Jingyu Yao,Jiukun Hu,Minxuan Sun,Peng Miao
Reactive oxygen species (ROS) mediated cell damage is one of the most popular and effective ways for cancer therapy. However, overexpressed antioxidant of reduced glutathione (GSH) is always activated in tumor cells, which maintains redox equilibrium. Attempts to deplete GSH and elevate ROS levels can be potent therapeutic strategies. Herein, tumor cell membrane-encapsulated Fe 3 O 4 @MnO and 2′,3′-cyclic GMP-AMP (cGAMP) are prepared as the nanocatalyst for cancer therapy. The ionized Fe 3+ /Fe 2+ redox couple is utilized to initiate the Fenton reaction. Intracellular GSH level can thus be efficaciously controlled, and peroxide oxidation is catalyzed to produce excessive ROS. Meanwhile, cGAMP is released to trigger the cyclic GMP-AMP synthase (cGAS)-stimulator of interferon genes (STING) signaling axis. This targeted activation enhances the recruitment of macrophages, stimulates the secretion of critical pro-inflammatory cytokines, and consequently bolsters the efficacy of innate immune responses within the tumor microenvironment.
研究领域:
肿瘤学
·
免疫学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemical Engineering Journal Advances
·
2021
·
IF 0
Zheng Liu,Xiaodan Wang,Fengyu Lai,Chao Wang,Nan Yu,Hongxia Sun,Baoyou Geng
A three-dimensional MnO/C nanocomposite is fabricated through a simple route of immersion and subsequent calcination. The carbon content and morphology of the sample are adjusted by adjusting the calcination temperature. This material combines the excellent lithium storage performance of MnO and the good stability of carbon. Because MnO is embedded in the three-dimensional carbon networks, it can provide proper space to alleviate the volume effect during discharging and charging. The unique architecture and large surface area enable the composites to exhibit remarkable lithium storage properties with outstanding rate performance, high reversible capacity, and cycle life. The optimized sample (MnO/C-750) has excellent performance of 1067.95 mAh g −1 at 0.2 A g −1 over 200 cycles and 722.32 mAh g −1 at 1 A g −1 over 600 cycles.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zifen Fan,Jiaxin Ren,Huiying Bai,Panpan He,Liang Hao,Ning Liu,Bingyu Chen,Ran Niu,Jiang Gong
The integration of freshwater and electricity cogeneration through photothermal effect is regarded as a new and promising strategy for high-efficiency solar energy utilization. However, the central issue is the design of low-cost, flexible photothermal materials to efficiently utilize solar energy. Herein, flexible MnO/C nanoparticle-based solar evaporators are constructed to realize simultaneously interfacial solar evaporation and thermoelectricity generation. The MnO/C nanoparticle is facilely fabricated by pyrolysis of Mn-MOF, which is synthesized from discarded poly(ethylene terephthalate) bottles in one-pot solvothermal method. By altering pyrolysis temperature of Mn-MOF from 400 °C to 700 °C, the morphology of MnO/C nanoparticle is readily tailored from cube to sphere, octahedron and polyhedron. Owing to the fast water transport, strong sunlight absorptivity, high solar-to-heat conversion efficiency, and low evaporation enthalpy, the hybrid solar evaporator presents the high evaporation rate of 2.38 kg m −2 h −1 and solar-to-vapor conversion efficiency of 98.4% under 1 Sun irradiation, surpassing many advanced photothermal materials. More importantly, integrated with a thermoelectric module, the bifunctional solar evaporator recovers low-grade heat from water evaporation to perform thermoelectric conversion, achieving the maximum output voltage of 330 mV under 3 Sun irradiation. This work highlights the potential of flexible and durable solar evaporators for freshwater and power cogeneration, not merely contributing to achieving carbon neutrality and upcycling of waste plastics, but also opening opportunities for giant electricity supply from sustainable solar energy.
研究领域:
能源材料
·
环境科学
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）