INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
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IF 4.939
Liuting Zhang,Nianhua Yan,Zhendong Yao,Ze Sun,Xiong Lu,Farai Michael Nyahuma,Ruihan Zhu,Guoping Tu,Lixin Chen
Different nanocrystalline magnesium with carbon layers were successfully synthesized via a facile wet-chemical ball milling method for 20, 30 and 40 h, respectively. Based on Scherrer formula and X-ray diffraction results, the average crystallite size of all the three samples was below 30 nm. TEM observations showed that the hydrogenated Mg particles were covered with carbon layers. Moreover, the 40 h ball milled Mg sample showed outstanding hydrogen storage performance especially in the aspect of hydrogen absorption . The as-prepared sample started to take up hydrogen at nearly room temperature and eventually absorbed 6.8 wt% hydrogen at 200 °C. The apparent activation energy (E a ) of hydrogen absorption for the sample was decreased to 26.7 kJ/mol, much lower than that of other reported systems. For the dehydrogenation experiments, the hydrogenated sample could start to release hydrogen at about 275 °C and 6.5 wt% hydrogen was desorbed in 20 min at 325 °C. Interestingly, the prepared samples showed noteworthy air stability. Been placed in the air for 60 min, the dehydrogenation kinetics and hydrogen capacity of the three samples were basically unchanged, making it possible to be used in future commercial applications.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Weisan Fang,Ying Tang,Junqi Chen,Jie Li,Liang Fang
Two garnet-structured ceramics, Ca 3 B 2 GeV 2 O 12 (B = Mg, Mn), were synthesized using a traditional solid-state reaction method, and their sintering behavior, structures, vibrational spectra, and magnetic and microwave dielectric properties were characterized. Low permittivity ( ε r ) of 9.75 (Ca 3 Mg 2 GeV 2 O 12 ) and 11.06 (Ca 3 Mn 2 GeV 2 O 12 ), quality factor ( Q × f ) of 54,000 GHz (Ca 3 Mg 2 GeV 2 O 12 ) and 30,240 GHz (Ca 3 Mn 2 GeV 2 O 12 ), and temperature coefficient of resonant frequency ( τ f ) of −61.2 ppm/ ° C (Ca 3 Mg 2 GeV 2 O 12 ) and −66.4 ppm/ ° C (Ca 3 Mn 2 GeV 2 O 12 ) were obtained. The ε r value was correlated with the sum of the ionic polarization per unit volume. The Q × f value was associated with the part with a fully filled 3 d orbit, un-paired d electrons of B-site ion, and magnetic loss. The τ f was correlated to the bond valance at the A- and C-sites. Moreover, the fitting analysis of the far-infrared reflectance spectra of Ca 3 Mg 2 GeV 2 O 12 revealed that the active vibration modes in the low wave number range (100 - 400 cm -1 ) contributed mainly to the intrinsic microwave dielectric polarization.
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高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Aamir Hanif,Mingzhe Sun,Tianqi Wang,Shanshan Shang,Daniel C.W. Tsang,Jin Shang
NO 2 is a potent air pollutant because of its deleterious effects on human beings and other organisms. The state-of-the-art catalysis-based deNO x techniques (e.g., selective catalytic/non-catalytic reduction) are incapable of ambient NO 2 abatement due to their low efficiency at temperatures below 300 °C. It is thus conceivable to directly capture NO 2 from the atmosphere by selective adsorption on porous materials. This work reports the rational development and demonstration of the Mg–Al layered double hydroxides (LDHs) and their derived mixed metal oxides (MMO), using environmentally benign solvents , as high-capacity adsorbents for ambient NO 2 abatement. By boosting the densities of accessible basic sites using layer delamination strategies, the highest NO 2 adsorption capacity of 8.52 mmol/g was achieved by the delaminated LDH material (LDH-AM), which was substantially higher than other popular and robust adsorbents, such as zeolites (0.36–3 mmol/g) and carbon-based adsorbents (2–6 mmol/g). Using Fourier transform infrared spectroscopy and powder X-ray diffraction, it was revealed that NO 2 adsorption occurs on the surface M-OH basic sites and within the layers by simultaneously replacing the interlayer CO 3 2− ions of LDH. This work affords not only promising, durable, and scalable adsorbents for ambient NO 2 removal but also a strategy to develop adsorbents with high density of basic sites for capture of other pollutant acid gases from the environment.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Huimin Shi,Hang Zhang,Zhi Chen,Tao Wang,Lei Wang,Wei Zeng,Guanhua Zhang,Huigao Duan
Titanium nitride (TiN) has been attracting increasing interest as an anode material for electrochemical energy storage and conversion systems due to its superior thermal stability, electrical conductivity and chemical durability. The most commonly used strategy to synthesize TiN nanostructures is nitriding TiO 2 nanostructures using ammonia gas as the nitrogen source, and thus is not environmental friendly. Herein, we report an ammonia-free strategy to synthesize TiN nanomaterials using TiO 2 precursors via a magnesium-assisted nitriding reaction using nitrogen gas (N 2 ) as the nitrogen source. Systematical studies were conducted to reveal the mechanism of magnesium-assisted nitriding process in constructing TiN nanostructures under N 2 atmosphere. The as-synthesized TiN NRs were directly used as the anodes for lithium ion batteries and delivered an excellent reversible capacity of 710 mAh g −1 at the current density of 100 mA g −1 after 200 cycles. In addition, the TiN NRs also exhibited excellent cycling stability and rate capability. Our work provides a low cost, environmental friendly and reliable strategy to synthesize TiN materials from TiO 2 by using N 2 as the nitrogen source, which may facilitate the practical applications of TiN materials in electrochemical/photo-electrochemical energy storage and conversion systems.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Zhanyong Zhao,Rongxia Zhao,Peikang Bai,Wenbo Du,Renguo Guan,Die Tie,Nithesh Naik,Mina Huang,Zhanhu Guo
A new organic chemical reduction method was successfully used to synthesize magnesium-coated graphene (GNPs), and xGNPs/AZ91 nanocomposites with different contents were fabricated by vacuum hot-pressing sintering. The microstructure of the composite was mainly composed of the matrix (α-Mg) and the precipitated phase (β-Mg 17 Al 12 ) with different morphologies such as rods, spindles, and granules. The coarse irregular β phases precipitated along the grain boundaries, while fine rod-like β phases were distributed inside the crystal grains. With the increase of GNPs content, the grain and structure are significantly refined under the action of two mechanisms of increasing the nucleation rate and hindering the growth of grains. The average grain size of the 2.5-wt% GNPs/AZ91 composite dropped from 40.78 µm to 25.39 µm, a reduction of 37.7%. In addition, the orientation relationship (OR) between β-Mg 17 Al 12 and α-Mg was shown as [—3 —1 —1] β-Mg17Al12 )∥[1 —1 0 —1] α-Mg . Further, finer β phases were further precipitated in the grain boundaries and matrix. Moreover, the β precipitated phase and the GNP, as well as the GNP and magnesium-matrix formed a nano-scale contact interface and a diffusion bonding interface, thereby greatly enhancing the interface bonding strength between GNP and the matrix. Compared with AZ91 alloy , the grain refinement and load transfer caused by GNPs increased the microhardness of the composite by 17.6% and the friction coefficient was decreased by 37.4%. The significant improvement in the wear resistance of the composites was due to the effect of the lubricating layer formed by GNPs on the wear surface, which changed from severe delamination wear to slight delamination and abrasive wear behavior.
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Journal of Energy Storage
·
2024
·
IF 8.9
Yuxuan Wu,Yinda Li,Yunhao Lu,Jicheng Jiang,Aijun Zhou,Bo Xu,Xiongwen Xu,Jian Tu,Bin Pan,Xinbing Zhao,Jian Xie
Among some practical O3-type layered oxide cathodes, NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM) features a high specific capacity and moderate cyclability. However, sluggish Na + transfer kinetics, low structural stability, and rapid capacity loss during long-term cycling, are still posing a challenge to commercial applications of this material. In this work, we propose a Mg and Cu co-doped O3-type NaMg 0.02 Cu 0.02 Ni 0.33 Fe 0.27 Mn 0.36 O 2 (MC-NFM) with a stable structure and good cycling stability. It was found that the Mn O bonds in MC-NFM are obviously reinforced by synergistic doping with small amounts of Mg and Cu, leading to enhanced structural robustness, decreased Na + migration barrier, and delayed O3-P3 phase transition. As a result, longer cycle life and enhanced rate performance are achieved. MC-NFM can yield a specific capacity of 142.1 mAh g −1 at 0.1C and 116.0 mAh g −1 at 5C, and maintain 83.6 % of its initial capacity after 400 cycles at 1C. This work provides a promising design of O3-type cathode for sodium-ion batteries.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Jingwei Wang,Zejia Zhao,Ravi Muchakayala,Shenhua Song
The highly stretchable pure poly(vinyl alcohol) (PVA) membranes with high amorphicity and large ductility are prepared based on an N-methylpyrrolidone (NMP) solution. Meanwhile, the PVA based gel electrolyte membranes doped with magnesium trifluoromethanesulfonate (Mg(Tf) 2 ) and plasticized with 1-ethyl-3-methylimidazoliumtrifluoromethanesulfonate (EMITf) are fabricated with the NMP as the solvent. For the plasticized membranes, the 60PVA-40Mg(Tf) 2 + 10EMITf electrolyte system exhibits the highest room-temperature ionic conductivity (1.2 ×10 −3 S cm −1 ), excellent thermal performance and satisfying strength and flexibility. This system is applied for the fabrication of electric double-layer capacitors (EDLCs), acting as both separator and electrolyte. The EDLC shows a specific capacitance of 118 F g −1 with an excellent stability and almost 100% coulombic efficiency over 1000 charge-discharge cycles when charging at 0.85 V under a current density of 313 mA g −1 . When the charging voltage is increased to 2 V, the stability of the EDLC somewhat decreases but the coulombic efficiency is still near 100%. Additionally, the CV curves exhibit symmetrical and ideal rectangular shapes without the presence of redox peaks at low scan rates even for 1000 cycles. Consequently, this polymer electrolyte system should be an excellent candidate for ion device applications.
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JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Jian Fan,Chunyan Cao,Lan Shang,Liangjie Yuan
High-nickel layered oxide LiNi 0.9 Co 0.1 O 2 is a promising cathode material for lithium-ion batteries due to its high specific capacity and low cost. However, the internal stress generated during deep delithiation can cause microcracks, giving rise to rapid capacity decay and deteriorated thermal stability. In this work, Mg and Al ions are incorporated into the bulk phase of LiNi 0.9 Co 0.1 O 2 via high-temperature solid-state reaction. We demonstrate that Al 3+ doping enhances charge transfer between transition metal (TM) and oxygen layers, strengthening TM-O bonds and stabilizing the structure, thereby alleviating structural distortions under deep delithiation. More impressively, Mg 2+ doping significantly improves structural stability through a pillaring effect, effectively suppressing irreversible phase transitions during charge-discharge cycling. Consequently, Mg-Al co-doping optimizes the overall structural integrity of the high-nickel cathode, enhances its stability, and inhibits lattice oxygen release during long-term cycling. The Mg-Al co-doped LiNi 0.9 Co 0.1 O 2 delivers a remarkable capacity of 177.3 mAh g −1 after 100 cycles with capacity retention of 93.5 %, demonstrating outstanding cyclability. This Mg-Al co-doping strategy provides a simple and practical approach to enhance the electrochemical performance of high-nickel layered cathode materials.
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产品关联
DOI
高影响因子
RARE METALS
·
2025
·Vol. 44
·期 4
·2805-2814
·
IF 11
Chen Xu-Dong,Zhao Si,Feng Xin-Fu,Huang Jin,Wang Yan,Qiu Zhen-Chun,Wang Jian-Biao,Huang Yi-Yin,Zheng Li-Tuo,Wei Ming-Deng,Hong Zhen-Sheng
Graphic abstract
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DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 48
·
IF 12.5
Wenbo Liu,Lu Li,Menggang Li,Zongqiang Sun,Youxing Liu,Shaojun Guo
Mg-CO 2 battery has emerged as a promising battery technology by harnessing greenhouse gas as an active material. However, its development is greatly hindered by sluggish CO 2 conversion kinetics, resulting in high overpotentials and poor reversibility. Herein, we report a class of 2,2,6,6-tetramethylpiperidoxyl (TEMPO) homogeneous catalyst to regulate CO 2 adsorption and optimize reaction pathways through a quantum tunneling effect induced by electron transfer from the TEMPO free radical to CO 2 that classical electron transfer mechanisms cannot overcome. This quantum tunneling effect not only enables CO 2 reduction at lower voltage but also regulates the CO 2 adsorption environment, leading to the alternated reaction pathway for the formation of flower-like MgC 2 O 4 as the discharge product, rather than the dense MgCO 3 typically formed in traditional models. The TEMPO-based Mg-CO 2 batteries achieve an exceptional discharge voltage of 1.1 volts and a charge voltage of 1.3 volts, with stable cycling performance for over 450 hours, representing the best-reported performance among Mg-CO 2 battery systems to date.
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Mengdan Ma,Anning Zhou,Tao Hong,Xinyu Jia,Moxuan Liu
Metal-organic frameworks (MOFs) are promising materials for CO 2 adsorption and capture. The unique crystal structure and the open porous structure of MOFs are key factors affecting their CO 2 adsorption performance, but the precise tuning of MOF structures remains a challenge. Herein, we applied the Kamlet-Taft method to investigate the effect of solvent proton-supplying/accepting capaity (β/α parameters) on the structure and CO 2 adsorption performance of Mg-MOF-74 by tuning the reaction solvent polarity. It was found that the ratio of the nucleation rate/growth rate of Mg-MOF-74 could be effectively controlled by adjusting the β/α value of the solvent, realizing the regulation of the crystal structure and morphology of Mg-MOF-74. In addition, the size of solvent molecules played a crucial role in the pore size of Mg-MOF-74. Interestingly, the solvent molecules were competitively coordinated with ligands and participate in the growth of Mg-MOF-74 upon decreasing the β/α value. The crystal structure, morphology and pore size of Mg-MOF-74 could be precisely regulated by the β/α value and molecular size of the reaction solvent, and the highest performing Mg-MOF-74 exhibited a CO 2 adsorption capacity of 7.38 mmol/g.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Wanli Zhao,HongLi Suo,Shuo Wang,Lin Ma,Lei Wang,Qiuliang Wang,Zili Zhang
MgB 2 superconductor pellets were synthesized through Mg gas infiltration method using nanosized- and microsized B powders. There was a marked difference in the superconducting properties of the two samples, particularly in the pinning force and dominant pinning mechanism. The microstructures of the samples were observed using HR-TEM and STEM-HAADF, and the results showed that the primary reason for the difference in the superconducting properties is the distribution of the nanosized second-phase particle MgO. Additionally, a feasible reaction model for the Mg gas infiltration method was established. Compared to the Mg liquid infiltration method, the gas infiltration showed better penetrability ability with a small amount of residual Mg. This study presents a novel synthesis process to fabricate an MgB 2 pellet with superior density and superconducting properties. This method can be used in multiple applications such as superconducting bearings, compact superconductor magnets, and magnetic shielding.
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