JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Haotian Yu,Zeming Yuan,Qiang Han,Jiaxin Li,Tao Li
Magnesium hydride (MgH₂) is a promising solid-state hydrogen storage material for large-scale applications, owing to its high gravimetric capacity and natural abundance. However, its practical implementation is hindered by high thermodynamic stability and sluggish kinetics, originating from strong Mg–H bonds and limited hydrogen diffusion, which typically require elevated temperatures and prolonged cycling. Moreover, existing catalytic systems frequently suffer from inadequate dispersion, interfacial instability during cycling, and a lack of quantitative understanding of the cooperative effects between oxygen vacancies and multivalent Ce. To address these issues, a Co/CeO₂@C composite catalyst was synthesized through a hydrothermal–calcination method and incorporated into MgH₂ via ball milling. The microstructural characteristics, hydrogen storage properties, and underlying reaction mechanisms were systematically investigated using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Pressure-Composition-Temperature (PCT) tests and Johnson–Mehl–Avrami–Kolmogorov (JMAK) kinetic fitting. Evaluation based on microstructure, hydrogen uptake/release capacities at varying doping levels, and corresponding activation energies revealed that the composite with 6 wt.% Co/CeO₂@C exhibited a hydrogen uptake of 5.74 wt.%. At 300 °C, the 6 wt.% composite released 5.15 wt.% H₂ within 100 min, demonstrating its superior dehydrogenation performance at this doping level. The activation energy decreased from 145.43 kJ·mol⁻¹ to 93.35 kJ·mol⁻¹, and the thickness loss due to interfacial degradation was less than 1 nm. This enhancement is ascribed to a triple synergistic mechanism of “hydrogen spillover–electron transfer–confinement stabilization”. Co offers active sites for hydrogen dissociation, oxygen vacancies in CeO₂ promote hydrogen diffusion, and the carbon matrix suppresses particle agglomeration. This study contributes to quantitatively understanding the synergy between oxygen vacancies and multivalent Ce, establishes a clear “microstructure–catalytic mechanism–macro-performance” correlation, and offers new insights for the practical deployment of Mg-based hydrogen storage materials. It is noted, however, that the key findings presented herein align closely with trends reported in prior literature, highlighting the consistent performance landscape observed for this class of catalytic modifiers.
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2016
·
IF 2.183
Liangjie Pan,Benxue Jiang,Jintai Fan,Pande Zhang,Xiaojian Mao,Long Zhang
Aluminum Garnet (LuAG) precursors were co-precipitated by using ethanol–water as the precipitant solvent. The effect of different volume ratios of ethanol to water ( R ) on the preparation of pure-phase LuAG powders has been mainly studied. The evolution of phase, composition and micro-structure of the as-synthesized LuAG powders were characterized by TG/DTA, FTIR , XRD , BET, and SEM. The BET-equivalent diameter of LuAG nano particles increased with R . The ethanol–water solvent does not change the main composition of the LuAG precursors, but has great influence on the morphology of the final LuAG nano particles . Uniformly dispersed LuAG powders calcined at 1200 °C for 3 h with a particle size of approximately 120 nm were obtained by using ethanol–water solvent with proper R = 1. The mechanism of ethanol in the preparation process was discussed.
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高影响因子
CURRENT APPLIED PHYSICS
·
2020
·
IF 2.281
Yanqun Chen,Chao Wang,Zheng Ma,Lanwei Li,Shuyao Li,Jianli Wang
n-type Mg 3 Sb 2 –Mg 3 Bi 2 alloy shows as a potential new thermoelectric material (TE) and has been widely researched recently. The pure phase n-type Mg 3 · 20 (Sb 0·3 Bi 0.7 ) 1.99 Te 0.01 were prepared by adjusting Mg content with the Bi impurity phase being effectively suppressed. Then, Co element was doped into the pure phase and the electrical conductivity of samples were improved. With a high power factor of 20.3 μ W cm −1 K −2 for Mg 3·185 Co 0·015 (Sb 0·3 Bi 0.7 ) 1.99 Te 0.01 at 525 K. Additionally, it was found that the phonon scattering is enhanced due to the larger atomic mass of Co comparing to Mg and the lattice thermal conductivity is reduced. As a result, a high ZT value of ~ 1.03 at 525 K is achieved for the Mg 3·185 Co 0·015 (Sb 0·3 Bi 0.7 ) 1.99 Te 0.01 .
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Weihao Ye,Xiaotang Liu,Qiying Huang,Zhiping Zhou,Guangqi Hu
Europium doped Calcium fluoride (CaF 2 :Eu 2+ ) nanoparticles have been synthesized by co-precipitation method using different surfactants, in which anhydrous ethanol was used as solvent and the nanoparticles was sintered in air. The self-reduction was observed in the as-prepared CaF 2 :Eu 2+ nanoparticles and can be explained by charge compensation model based on the substitution. Scanning electron microscope (SEM) and X-ray power diffraction (XRD) showed that the nanoparticles were about 50 nm⿿1 μm and in a single phase. A broad emission centered at 425 nm due to Eu 2+ 4f 7 ⿿4f 6 5d 1 transition has been observed with excitation bands between 337 and 385 nm by the fluorescence spectrometer. The corresponding excitation spectra showed a wide excitation range in the violet region due to 4f 7 ( 8 S 7/2 ) ⿿ 4f 6 5d 1 (t 2g ) The luminescent properties of the phosphor was thoroughly examined. Furthermore, the effect of using different surfactants on the sizes of CaF 2 :Eu 2+ nanoparticles, related mechanisms was also investigated.
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高影响因子
OPTICAL MATERIALS
·
2018
·
IF 2.32
Renping Cao,Wudi Wang,Jinlong Zhang,Yujiao Ye,Ting Chen,Siling Guo,Fen Xiao,Zhiyang Luo
Sr 2 Mg 3 P 4 O 15 :R (R = Bi 3+ , Mn 2+ , and Bi 3+ /Mn 2+ ) phosphors are synthesized by a solid-state reaction method in air. Sr 2 Mg 3 P 4 O 15 :Bi 3+ phosphor with excitation 380 nm shows blue light and its emission band peaking at ∼445 nm is observed. Under excitation at 355 and 416 nm, Sr 2 Mg 3 P 4 O 15 :Mn 2+ phosphor shows red emission with a single broad emission band peaking at ∼630 nm in the range of 500–800 nm owing to the 4 T 1 (G) → 6 A 1 transition of the Mn 2+ ion. The optimal Mn 2+ ion content in Sr 2 Mg 3 P 4 O 15 :Mn 2+ phosphor is ∼0.05 and the lifetime of Sr 2 Mg 2.95 P 4 O 15 :0.05Mn 2+ phosphor is ∼6.17 ms. After Bi 3+ ion is co-doped, emission intensity of Sr 2 Mg 3 P 4 O 15 :Mn 2+ phosphor can be enhanced obviously due to energy transfer (ET) from Bi 3+ to Mn 2+ , which is confirmed by the luminescence properties and lifetimes of Sr 2 Mg 3-x P 4 O 15 :Bi 3+ , Mn 2+ phosphor. Luminous mechanism and ET process of Sr 2 Mg 3-x P 4 O 15 :Bi 3+ , Mn 2+ phosphor are explained by the simple energy level diagram of Bi 3+ and Mn 2+ ions.
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 3
·158
·
IF 1.784
Gao Dong-Sheng,Gao Xiang-Dong,Wu Yong-Qing,Zhang Tong-Tong,Yang Jing-Nan,Li Xiao-Min
Co doped BaSnO 3 films [BaSn 1 − x Co x O 3 (0 ≤ x ≤ 0.50), i.e., BSCO] have been grown on MgO single-crystal substrates via pulsed laser deposition. Effects of the Co-doping level on the crystallinity, the microstructure, and optical properties of the BSCO films are investigated. All the BSCO films are of high crystallinity and grown epitaxially on MgO substrates. The lattice parameter of the (200) plane drops linearly with the increase of the ‘ x ’ value. The Co doping is found to increase the film roughness and the grain size, and a RMS roughness of 8.33 nm and grain size up to 100 nm are observed in the film with x = 0.50. The low Co-doping level ( x = 0.05, 0.1) has slight anti-reflection effects on the incident visible light, and the Co-doping level higher than 0.2 reduces the optical transmittance significantly. The optical bandgap shows a first-rising then falling trend with the increase of the Co content, and the lowest bandgap of 1.94 eV is realized in the BSCO film with x = 0.50.
研究领域:
材料科学
·
凝聚态物理
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薄膜制备
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光学材料
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功能氧化物
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DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 27
·14278-14285
·
IF 8.867
Haibo Tang,Xinlong Tian,Junming Luo,Jianhuang Zeng,Yingwei Li,Huiyu Song,Shijun Liao
Transition metal nitrides have recently attracted significant interest as electrocatalysts for the oxygen reduction reaction (ORR) owing to their low electrical resistance and good corrosion resistance. In this paper, we describe the preparation of a Nb-based binary nitride material with a porous nanogrid morphology/structure. The catalyst exhibited good catalytic activity and high stability towards oxygen reduction. We also intensively investigated the effect that doping with a second transition metal had on the performance of the catalyst. We found that the ORR activity of NbN could be enhanced significantly by enriching the d electrons of Nb through doping with a second transition metal, and that doping with cobalt resulted in the best improvement. Our optimal catalyst, Nb0.95Co0.05N, had an ORR activity ∼4.6 times that of NbN (current density @ 0.6 V vs. the RHE). XPS results revealed that Co doping increased the proportion of Nb in a low-valence state, which may be one of the most important reasons for the enhanced performance. Another important reason is the high surface area resulting from the porous nanogrid morphology. As transition metal doping is an attractive way to enhance the activity of nitride catalysts, our work may provide an effective pathway to achieve this.
研究领域:
材料科学
·
电化学
·
纳米科技
·
催化化学
·
能源材料
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Chenwei Xu,Chenxia Li,Degang Deng,Hua Yu,Le Wang,Changyu Shen,Xufeng Jing,Shiqing Xu
A series of new double perovskite structure CaLaMgTaO 6 : Bi 3+ , Eu 3+ phosphors were synthesized by high-temperature solid-phase method. The crystal structure, luminescence characteristics and temperature sensing performance have been systematically studied. The substitution rule of Bi 3+ in CLMT and its luminescence characteristics are described. The decay curve of Bi 3+ further proves the existence of an energy transfer from Bi 3+ to Eu 3+ . They have different thermal quenching behaviors, and their fluorescence intensity ratio (FIR) parameter has tremendous temperature sensing performance. Under 329 nm ultraviolet excitation, the emission peaks at 408 nm and 614 nm are used as the reference signal, the largest absolute sensitivity is 0.0127 K −1 at 573 K, and the maximum relative sensitivity is 1.33%K −1 at 483 K. This indicates that CaLaMgTaO 6 : Bi 3+ , Eu 3+ is a material with excellent temperature measurement performance and applicability in non-contact optical thermometers.
研究领域:
材料科学
·
发光材料
·
光学传感
·
无机化学
·
功能材料
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Yafei Guo,Chang Tan,Peng Wang,Jian Sun,Junjie Yan,Weiling Li,Chuanwen Zhao,Ping Lu
Coal and biomass fly ash was impregnated with tetraethylenepentamine (TEPA) to prepare solid CO 2 sorbent. Experimental CO 2 adsorption capacities of the sorbent in fixed-bed column were fitted to several kinetic equations. The modified Avrami fractional kinetic model could accurately predict the CO 2 adsorption kinetic behaviors of the sorbent under different conditions. CO 2 adsorption rate increases with the increase in temperature, initial CO 2 concentration and gas flow rate, as a result of the decreased CO 2 diffusion resistance. A mathematical model was proposed and demonstrated to well predict the CO 2 adsorption breakthrough curves in the fixed-bed column. Effects of temperature, initial CO 2 concentration and gas flow rate on the mass transfer kinetic behaviors of the desired sorbent were investigated. The positive effect of these factors on promoting the overall mass transfer coefficient and the internal mass transfer coefficient is not significant. The external mass transfer coefficient will be remarkably reinforced with the increase in these operating parameters, due to the change in viscosity and density of the gas phase and the reduced external mass transfer resistance. Internal mass transfer process is determined as the rate-limiting step for CO 2 adsorption. The results will lay the groundwork for future scale-up application of the sorbent in post-combustion CO 2 capture.
研究领域:
环境科学
·
化学工程
·
能源工程
·
大气污染控制
·
碳捕集与封存
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Juping Ma,Yan Sun,Fei Yu,Tianfeng Xue,Lili Hu
Tb 3+ ions doped optical materials have emerged as gain media for green fiber lasers. Dy 3+ ions were proposed as a sensitizer of Tb 3+ ions in glasses to increase the excitation efficiency, yet a systematic understanding of the impact of Dy 3+ doping on spectroscopic and physiochemical properties of glasses remains lacking. Here, using Tb 3+ /Dy 3+ doped fluoride glass as a model system, we reveal that Dy 3+ doping not only enhances Tb 3+ emission intensity, but also increases the thermal stability of fluoride glasses. Detailed spectroscopic characterizations indicate that co-doping Dy 3+ ions boosts visible luminescence intensity of Tb 3+ ions in fluoride glasses due to sensitization of Tb 3+ by Dy 3+ ions. Importantly, we deeply research the energy transfer process , ascertain several important factors affecting energy transfer efficiency and propose optimal doping concentrations of Tb 3+ and Dy 3+ ions for visible emission. We envisage that our finding provides a new perspective for the synthesis of Tb 3+ -doped fluoride glasses with enhanced thermal stability, and may be extended for the fabrication of Tb 3+ -activated optical fibers .
研究领域:
光学材料
·
无机非金属材料
·
光子学
·
稀土掺杂玻璃
·
光纤激光器
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 7
·8450-8459
·
IF 2.478
Zhang Pengfei,Ma Weibing,Wang Shenghui,Guo Jingdong,Hong Jingnan,Ba Ruiqing,He Xinghui,Li Jing
Aurivillius-type piezoceramics, Na 0.15− x Li x Bi 2.85− x Ce x Ti 0.7 Nb 1.3 O 9 (NBTN-LC100 x ; x = 0, 0.02, 0.04, 0.06), were fabricated by the solid-state reaction method. The crystal structure, surface microstructure, and electrical properties of NBTN-LC100x ceramics were studied systematically. The XRD revealed that the (LiCe) co-doping induced lattice distortion and the orthogonality of ceramics were weakened. The grain size decreased obviously from 23.1 to 9.1 µm and the Curie temperature ( T C ) decreased from 877 to 853 °C as the increase of (LiCe) content. As x = 0.04, the NBTN-LC100 x (NBTN-LC4) ceramics had the best performance, its T C , tanδ at 500 °C, E C , and P r were 861 °C, 7.61%, 62 kV/cm, and 3.4 µC/cm 2 , respectively. The piezoelectric property was enhanced significantly and optimal d 33 value was about 20.7 pC/N at x = 0.04 for NBTN-LC100 x ceramics. In addition, the NBTN-LC4 ceramics possessed a good thermal stability after annealing at 850 °C for 2 h. The high d 33 , high T C , low tanδ, good thermal stability of NBTN-LC4 ceramics make it is potential candidate in high-temperature electronic devices.
研究领域:
材料科学
·
陶瓷
·
压电材料
·
固态化学
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 8
·期 1
·149-158
·
IF 1.5
Zhenhua Yan,Min Wang,Baoxu Huang,Renmin Liu,Jinsheng Zhao
High catalytic activity of Pt-Co/G (15 wt% Pt) alloy particles are synthesized on reduced graphene oxide (RGO) and reduced by simple ethylene glycol (EG). The results of X-ray diffraction and transmission electron microscopy analysis show that the average size of metal particles is ca. 4.1 nm, and the metal particals are highly dispersed on the graphene. The cyclic voltammogram was used for evaluating the electrocatalytic activity of the catalyst. In addition, the performance of this catalyst was investigated in microbial fuel cells (MFCs). It produced a maximum power density of 1378 mW/m 2 , which was quite close to that with a Pt/C (20 wt% Pt) cathode (1406 mW/m 2 ); the Coulombic efficiency reaches 71.6%, which was better than that of the Pt/C (52.0 %). And the total cost of Pt- Co/G catalyst were lower than that of Pt/C catalyst. Thus, the Pt-Co/G probably provides a new solution for finding effective cathode materials for MFC.
研究领域:
材料科学
·
电化学
·
能源工程
·
纳米技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）