MATERIALS LETTERS
·
2017
·
IF 2.572
Tian Yang,Bo Zhang,Qing Zhao,Donglin He,Ping Luo,Aimin Chang
Highly dense and nanograined Mg(Al 1− x Cr x ) 2 O 4 ( x = 0.1, 0.3, 0.5) negative temperature coefficient (NTC) thermistor ceramics have been successfully fabricated by vacuum hot-pressed sintering. The X-ray diffraction analysis has showed that the sintered ceramics crystallize in a cubic spinel structure. The scanning electron microscopy results show the sintered samples to be nanograined with average grain size ranging from 200 to 500 nm. The relative density of the ceramics ranges from 74.2% to 92.3%. The relative density increases and then decreases with increasing Cr content, and reaches its maximum 92.3% at x = 0.3. The values of ρ 500 , B 500/800 and E a are in the range of 5.49 × 10 3 –6.06 × 10 8 Ω cm, 6847–12808 K, 0.591–1.105 eV, respectively, offer some prospects for potential use as high temperature NTC thermistors.
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JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Mingfeng Ma,Leipeng Li,Chongyang Cai,Yixiao Han,Yanmin Yang
Due to the unique outer electronic configuration, Mn 2+ can emit tunable luminescence over a wide wavelength range, which thus has a broad spectrum of applications in many fields such as lighting and anti-counterfeiting. Although the persistent luminescence of Mn 2+ in oxyacid salts has been widely studied, it is, however, rarely mentioned in fluorides, due to the fluorides’ wide band gap which cannot be effectively excited by ultraviolet light. Here, we mainly study the persistent luminescence of MgF 2 :Mn 2+ upon excitation of X-ray source. In addition, we also investigate the influence of Ca 2+ on the persistent luminescence of MgF 2 :Mn 2+ , and successfully achieve luminescence modulation from orange toward green in the CIE chromaticity coordinates. Finally, we show the potential applications of the persistent luminescence of (Mg,Ca)F 2 :Mn 2+ in terms of dynamic security.
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MATERIALS LETTERS
·
2018
·
IF 2.687
Zhilong Fu,Ting Liu,Xirui Kong,Yi Liu,Jie Xu,Bo Zhang,Huimin Chen,Zhaoyang Chen
The Mg-vermiculite (MVerm) with the nano-layered structure was synthesized by a facile hydrothermal method at 300 °C. The concentration of NaOH solution was found to be the most important factor for the formation of layered MVerm, and the optimal concentration was 2.05 mol/L. The structure, morphology and chemical composition of MVerm with layered structure were demonstrated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence (XRF) analysis. The basal spacing among interlayers of the MVerm material characterized by XRD was 1.169 nm. XRF results showed that the chemical composition of the as-synthesized MVerm was closest to the NVerm when the molar ratio of Si/Na was adjusted to 1/2.5. Furthermore, TG-DSC results indicated the as-synthesized MVerm exhibited similar thermal properties with other layered silicate materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·Vol. 47
·期 84
·35737-35746
·
IF 7.139
Heng Lu,Jianbo Li,Tianyu Xie,Yu'an Chen,Yangfan Lu,Zhongqing Liu,Qian Li,Fusheng Pan
While borohydrides , such as NaBH 4 , were often used as supplements to improve hydrogen storage properties of Mg/MgH 2 systems, they have long suffered from high decomposition temperature and irreversible dehydrogenation process. Here, we report that NaBH 4 can reversibly serve as a hydrogen storage host and reactant for Mg/MgH 2 systems under mild reaction conditions with the help of Al/AlH 3 . 90 wt%MgH 2 –5 wt.%AlH 3 –5 wt.%NaBH 4 (M-5AB) has been successfully synthesized using the conventional mechanical alloying technique. The dehydrogenation activation energy and enthalpy are 20% and 9% reduced than those of pure Mg/MgH 2 . After 10 hydrogen absorption and desorption cycles, the hydrogen storage capacity of M-5AB can reach 6.35 wt%. The X-ray diffraction (XRD) and the transmission electron microscope (TEM) measurements revealed that the interface of additives and Mg/MgH 2 decompose to Mg 17 Al 12 , MgAlB 4 and NaH phases. The Mg 17 Al 12 and MgAlB 4 phases reduces the barrier of free energies of hydrogenated and dehydrogenated states, helping NaBH 4 to recover after rehydrogenation. These discoveries indicate that Al species can boost the decomposition and reformation of NaBH 4 , providing a wider degree of freedom for the material design of Mg-based hydrogen storage materials .
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Jianguang Yuan,Haixiang Huang,Zan Jiang,Yujie Lv,Bogu Liu,Bao Zhang,Youhua Yan,Ying Wu
Borohydride magnesium is widely studied as a promising hydrogen storage material due to its high gravimetric and volumetric density (14.9 wt % and 112 g/L, respectively). Different types of catalysts play a good catalytic role in enhancing the hydrogen desorption rates in borohydride systems. In the present paper, multiwalled carbon nanotubes supported Ni (Ni/MWCNTs) were synthesized by a chemical reduction method, and the catalyst was introduced into Mg(BH4)2 to enhance the dehydrogenation kinetics. The effect of Ni/MWCNTs on the microstructural evolution and hydrogen storage properties of Mg(BH4)2 is studied. The Mg(BH4)2-5wt% Ni/MWCNTs (95M@5NiMWCNTs) sample exhibits the best hydrogen storage performance; it starts to release hydrogen at 93 °C, which is 113 °C lower than that of the primary Mg(BH4)2 sample. Moreover, it takes only 3600 s to desorb hydrogen completely at 300 °C, showing a significant improvement on hydrogen desorption kinetics. In comparison with the primary Mg(BH4)2 sample, the dehydriding apparent activation energy of the 95M@5Ni3MWCNTs2 sample is significantly lowered to 119.5 kJ mol–1. Transmission electron microscopy analysis exhibits that the striking improvement of dehydriding properties of Mg(BH4)2 is mainly due to the synergistic catalysis of Ni and MWCNTs. This work provides a new method for designing and synthesizing high-performance catalysts in borohydride hydrogen storage materials, which is potentially utilized as a hydrogen supplier for hydrogen fuel cells.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·Vol. 39
·期 7
·3313-3319
·
IF 2.93
Jing Lin,Fei Liang,Yaoming Wu,Wanqiang Liu,Limin Wang
We prepared Ti 1.4 V 0.6 Ni ribbons by arc-melting and subsequent melt-spinning techniques. Ti 1.4 V 0.6 Ni + x Mg ( x = 1, 1.5, 2, 2.5 and 3, wt.%) composite alloys were obtained by the mechanical ball-milling method. The structures and hydrogen storage properties of alloys were investigated. Ti 1.4 V 0.6 Ni + x Mg composite alloys contained icosahedral quasicrystalline phase, Ti 2 Ni-type phase, β-Ti solid-solution phase and metallic Mg. The electrochemical and gaseous hydrogen storage properties of alloys were improved with Mg addition. Ti 1.4 V 0.6 Ni + 2 Mg alloy showed maximum electrochemical discharge capacity of 282.5 mAh g −1 as well as copacetic high-rate discharge ability of 82.3% at the discharge current density of 240 mA g −1 compared with that of 30 mA g −1 , and the cycling life achieved above 200 mAh g −1 after 50 consecutive cycles of charging and discharging. The hydrogen absorption/desorption properties of Ti 1.4 V 0.6 Ni + x Mg ( x = 1, 2 and 3, wt.%) alloys were better than Ti 1.4 V 0.6 Ni. Ti 1.4 V 0.6 Ni + 3 Mg alloy also exhibited a favorable hydrogen absorption capacity of 1.53 wt.%. The improvement in the hydrogen storage characteristics caused by adding Mg may be ascribed to better hydrogen diffusion and anti-corrosion ability.
研究领域:
材料科学
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金属功能材料
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储能材料
·
物理化学
·
电化学
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INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
·
2026
·
IF 6.2
Baihe Hanqi,Guodong Xia,Wenbin Zhou,Hualin Ma
Surface modification for boiling heat transfer enhancement can boost the operational efficiency of energy systems and resolve thermal management challenges in electronic devices. However, the concurrent optimization of critical heat flux (CHF) and heat transfer coefficient (HTC) remains challenging. This is because it demands a delicate balance between facilitating bubble nucleation and suppressing detrimental bubble coalescence. To address this, concurrent improvement of the two parameters during boiling was achieved by spraying AgNWs (Ag nanowires) synthesized through a modified polyol method onto a microgroove substrate, thereby preparing Ag nanowire-coated microgroove surfaces (MG-AgNWs). The pool boiling characteristics, capillary wicking and bubble dynamics of MG-AgNWs under atmospheric pressure were systematically investigated. The as-prepared MG-AgNWs surface achieves a CHF of 349.9 W cm −2 and an HTC of 26.2 W cm −2 K −1 , corresponding to enhancements of 269.4% and 759.8% compared with the plain copper surface, respectively. Benefiting from the enhanced capillary performance of AgNWs and the excellent nucleation activity of MG, the MG-AgNWs surface exhibited significantly increased nucleation density, reduced bubble departure diameter, and accelerated bubble departure frequency compared with plain copper substrates. Capillary wickability tests on various surfaces demonstrated a strong linear correlation between wicking velocity and CHF. These results confirm that capillary-driven liquid replenishment inhibits dry spot expansion, leading to improved CHF. Collectively, such hierarchical surface presents a viable approach to creating efficient boiling heat transfer surface for advanced thermal control applications.
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Nature Chemistry
·
2026
·
IF 24.5
Wang Nan,Cui Chunyu,Xu Runjing,Wang Xiaofang,Wu Chaoxin,Pu Qihao,Wang Wentao,Cao Yongjie,Liao Mochou,Wang Fengmei,Wang Yonggang,Chen Yuhui,Ji Xiao,Xia Yongyao,Wang Fei
Magnesium–oxygen (Mg–O 2 ) batteries are considered promising candidates for next-generation energy storage systems due to their high specific energy, low cost and intrinsic safety. However, poor rechargeability remains a critical barrier, largely due to the lack of suitable electrolytes and undesired irreversible cathode reactions. Here we report a rechargeable non-aqueous Mg–O 2 battery enabled by a tailored electrolyte featuring a cage-like Mg 2+ solvation environment. We find that varying ether solvent chain lengths, alongside a tridentate chelating agent, can act coordinately to form a dynamic solvation microreactor. This solvation environment is consistent with the reversible formation of nanocrystalline magnesium peroxide at the cathode and remains compatible with reversible magnesium plating/stripping. The resulting Mg–O 2 batteries achieve a high initial discharge voltage approaching 2.0 V, an ultralow overpotential of 0.35 V, a remarkable round-trip energy efficiency of 80% and over 450 stable cycles. These results highlight a solvation-structure-guided strategy for enabling rechargeable Mg–O 2 batteries and potentially other multivalent metal–air systems.
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DOI
PubMed
高影响因子
Materials Today Chemistry
·
2026
·
IF 7.4
Cuicui Li,Siyi Tian,Yufeng Zhang,Wanlong Wu
Rechargeable Mg batteries are considered one of the most promising next-generation energy storage devices. However, their safety is of growing importance and needs to be considered during their practical applications. Herein, we present a safer Mg battery utilizing a non-flammable and chloride-free electrolyte consisting 0.5 m Mg(TFSI) 2 in hexamethylphosphoramide (HMPA) with 2-methoxyethylamine (MOEA) as the additive. This electrolyte promotes the construction of P, N-rich solid electrolyte interphase on Mg anode, exhibit highly reversibly deposit Mg, as well as exhibits no ignition under open-flame testing. Experimental and theoretical calculations indicate that the introduction of MOEA decrease HMPA coordination numbers in the solvation structure. Consequently, the Mg||Mg symmetric cell delivers a lower overpotential and stably cycled over 700 h at a current density of 0.1 mA cm −2 and a capacity of 0.1 mAh cm −2 . Moreover, the cell coupling the Mg anode and Mo 6 S 8 cathode deliver a capacity of 48.3 mAh g −1 after 500 cycles at 100 mA g −1 with a high average coulombic efficiency close to 100%. Our work provides a novel electrolyte design for the development of high safety rechargeable Mg batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Rujie Li,Yangyang Wang,Yi Jing,Shanxu Han,Xinyu Gao,Yajuan Liu,Chencan Du,Zhiyong Zhou
Lithium's critical role in energy storage drives demand for efficient recovery from high Mg/Li mass ratio brines. Traditional liquid-liquid extraction techniques face limitations in mass transfer and operational performance. In this study, we propose a continuous countercurrent microdroplet-based extractor integrating a T-junction microdisperser with a millimeter-scale column, utilizing a TCPP/NaBPh 4 /2-octanone system for selective Li + recovery. Systematic investigation of microdroplet dynamics revealed stabilized diameters of 145 μm (with a 20% column holdup) during extraction and 160 μm (with a 25% column holdup) during stripping. Optimized operation achieved >99% Li extraction and > 95% stripping efficiency, while reducing Mg/Li mass ratio from 274 to 0.44 in the organic phase. Remarkably, within a column height of 25 cm, the number of theoretical stages achieved for the extraction and stripping were 2.13 and 2.29, respectively. The volumetric mass transfer coefficient reached 0.119 s −1 , representing an improvement of one to two orders of magnitude compared to conventional devices. This microreactor approach demonstrates that precise microdroplet size control enhances mass transfer intensification, offering an efficient solution for strategic lithium recovery from high Mg/Li brines.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Muhammad Rashad,Hongzhang Zhang,Muhammad Asif,Kai Feng,Xianfeng Li,Huamin Zhang
Potentially safe and economically feasible magnesium batteries (MBs) have attracted tremendous research attention as an alternative to high-cost and unsafe lithium ion batteries. In the current work, for the first time, we report a novel room-temperature approach to dope the atomic species sodium between the vanadium oxide crystal lattice to obtain NaV3O8·1.69H2O (NVO) nanobelts. The synthesized NVO nanobelts are used as electrode materials for MBs. The MB cells demonstrate stable discharge specific capacity of 110 mA h g–1 at a current density of 10 mA g–1 and a high cyclic stability, that is 80% capacity retention after 100 cycles, at a current density of 50 mA g–1. Moreover, the effects of cutoff voltages (ranging from 2 to 2.6 V) on their electrochemical performance were investigated. The reason for the limited specific capacity of MBs is attributed to the trapping of Mg ions inside the NVO lattices. This work opens up a new pathway to explore different electrode materials for MBs with improved electrochemical performance.
研究领域:
储能
·
材料科学
·
电化学
·
纳米材料
·
电池技术
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Hui Liang,Jing Li,Xinhui Shen,Benliang Cao,Junxiang Zhu,Baozhang Geng,Sihang Zhu,Wenjiang Li
Amorphous catalysts have a large number of catalytic active sites. Here, we report a magnesium composite trace lanthanum catalyst (La@Mg), in which La and Mg layers form amorphous Mg–La compound on the surface of layered Mg. The test shows this La@Mg has hydrogen storage capacity of about 7.6 wt% and hydrogen desorption of 7.2 wt%, higher than that of crystalline La@Mg and sole Mg, rapid absorption/desorption kinetic and stable reversible absorption/desorption cycles. La@Mg exhibits an optimistic hydrogen storage performance than Mg-based materials previously reported in the literature. Combined with theoretical calculations, it is shown that the amorphous Mg–La has an catalysis on hydrogen storage performance of La@Mg system, which contributing to the dispersion of Mg and providing channels for hydrogen diffusion, facilitating hydrogenation by accelerating H atoms diffuse between the subsurface and the surface. This work provides experiment and mechanism guidance for the development of efficient hydrogen storage materials.
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高影响因子
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