Journal of Materials Chemistry A
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2018
·Vol. 6
·期 23
·10947-10957
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IF 9.931
Xiaoqin Sun,Gang Liu,Xiaoxiang Xu
Although SrNbO2N has a promising band gap of ∼1.8 eV for solar water splitting, its photocatalytic activity is generally very poor under ordinary conditions, primarily due to high defect levels caused by synthetic procedures. In this work, we managed to control defect levels inside SrNbO2N by incorporating Mg into the structure, i.e. SrMgx/3Nb1−x/3O2+yN1−y (0 ≤ x ≤ 1). Strikingly, a number of important properties such as band gap value, defect level, nitrogen content and particle size can be tuned by varying the amounts of Mg in the structure. More importantly, efficient photocatalytic water oxidation into oxygen was realized using these Mg modified SrNbO2N. An apparent quantum efficiency (AQE) as high as 5.13% was reached at 420 ± 20 nm for SrMg0.2Nb0.8O2+yN1−y (x = 0.6), which stands as the highest AQE reported to date for SrNbO2N. Mott–Schottky and X-ray photoelectron spectroscopy analyses revealed the shift of valence band maximum of SrNbO2N in response to Mg uptake. Moreover, open-circuit voltage decay measurements confirmed a much prolonged charge lifetime in Mg modified SrNbO2N. Thus, Mg serves not only to tailor band edge positions but also to ameliorate charge separation conditions in SrNbO2N, both of which contribute to the superior photocatalytic activities.
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CHEMICAL ENGINEERING SCIENCE
·
2018
·
IF 3.306
Qing Li,Xiaofang Zhu,Ying Zhang,Zhigang Zak Fang,Shili Zheng,Pei Sun,Yang Xia,Ping Li,Yang Zhang,Xing Zou
Hydrogen assisted magnesiothermic reduction (HAMR) of TiO 2 is a promising new process developed recently to produce Ti metal with low cost and less energy consumption. This work focuses on the understanding and optimization of the reduction process to control the quality of the reduced product. TiO 2 precursor particles with different relative densities were prepared, and the effects of the relative densities on reduction by Mg in H 2 were studied. The changes of oxygen contents vs. reduction time at various temperatures were investigated. The phase transformations during the reduction were analyzed both theoretically and experimentally. The relationship between the morphology of the reduced products and the relative densities of the TiO 2 precursors was analyzed by SEM characterization and the likely reason for the morphology evolution was discussed.
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JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
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2017
·Vol. 38
·期 1
·30-36
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IF 0.938
Sun W. Z.,Cheng J. G.,Huang Z. K.,Jiang Y.,Wu L. E.,Liu L. M.
The present work determined the phase relations in Si-Al-M-O-C (M = Zr, Mg) systems, involving SiC-Al 2 O 3 -ZrO 2 , SiC-Al 2 O 3 -MgO, SiC-SiO 2 -Al 2 O 3 -ZrO 2 and SiC-SiO 2 -Al 2 O 3 -MgO systems by XRD phase analyses of the solid-state reacted samples from powder mixtures of SiC, Al 2 O 3 , ZrO 2 , MgO and SiO 2 . Within these systems, SiC was respectively compatible with other neighboring phases, forming a set of four-phase compatibility tetrahedrons. The subsolidus phase diagrams of the SiC-SiO 2 -Al 2 O 3 -ZrO 2 and SiC-SiO 2 -Al 2 O 3 -MgO quaternary systems were presented.
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JOURNAL OF MATERIALS SCIENCE
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2017
·Vol. 53
·期 5
·3744-3755
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IF 2.599
Xie Zhi-Hui,Shan Shiyao
Self-healing coating based on nanocontainers (NCs) has been emerging as a great strategy to improve the anticorrosion ability of susceptible metal substrate. However, all the research referred to such smart coating to date is focus on organic coating instead of metallic coating. To fill this gap, 2-mercaptobenzothiazole (MBT) loaded porous hollow SiO 2 NCs are synthesized and incorporated successfully into an electroless Ni coating on Mg alloy in this work. The surface morphologies and the loading properties of the NCs are characterized by scanning electron microscopy, transmission electron microscopy, ultraviolet–visible spectrophotometer, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The favorable performance of Ni coating after incorporation of NCs is demonstrated by potentiodynamic polarization (PDP), linear polarization, and electrochemical impedance spectroscopy. Based on the results of PDP test, the corrosion current density ( i
c ) of the MBT@NCs (MNCs)-engineered Ni coating reduces slightly from 6.4 to 5.4 μA cm −2 after immersion in a corrosive media, while the value for MNCs-free coating increases by almost a factor of ten from 6.8 to 67.4 μA cm −2 . Our findings demonstrate the possibility of using corrosion inhibitors loaded NCs to enhance the corrosion resistance of a metallic coating and give new perspectives for functionalization of a metallic coating with nanomaterials.
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Materials Today Communications
·
2024
·
IF 3.7
Tingyu Zhao,Ruirui Cui,Kaixin Guo,Min Zhang,Xu Wang,Jun Zhang,Chaoyong Deng
In this work, by doping the B-site of BaTiO 3 with Mg elements, we have prepared BaMg x Ti 1- x O 3- x (BM x T) films with superparaelectric behaviors. The microstructures, polarization behaviors, breakdown strength, leakage current density, and energy storage performance are investigated systematically of the BM x T films. The breakdown strength of the film reaches 7.5 MV/cm when x = 0.18, at the same time, excellent energy storage density (67.7 J/cm 3 ) and energy storage efficiency (94.9 %) are obtained, which is attributed to the doping of the acceptor element Mg. By doping Mg with a lower chemical valence state to form defect dipoles in the lattice, the breakdown strength and polarization properties of the film are improved while reducing the crystallinity of the film, forming a hysteresis loop with superparaelectric properties. This work provides a feasible route to design superparaelectric materials with simple compositions for high-performance capacitive energy-storage.
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FUEL
·
2024
·
IF 6.7
Shuai Ma,Hongyu Huang,Haoming Zou,Xijuan Lv,Shuai Zhao,Ting Zhang,Qinghai Shu
The study focuses on resolving moisture-induced oxidative deactivation and Mg/PTFE interfacial bonding challenges in reactive materials by utilizing polydopamine (PDA) to bridge magnesium (Mg) and polytetrafluoroethylene (PTFE). Initially, a 5 % PDA content was set based on FIB-SEM and specific surface area results, yielding a surface area of 18.2794 m 2 /g for Mg@5%PDA. The contact angle reached 76.91°, a 19.62° increase over raw Mg, signifying improved hydrophobicity. Subsequently, analysis of the thermal and combustion behavior of Mg@PTFE indicated continuous improvement with increasing PTFE content, reaching an inflection point at 8 % PTFE. The DSC peak temperature of Mg@PTFE increased with higher PTFE content, indicating enhanced stability. However, the DSC heat release reaches its maximum of 5806 J/g at 8 % PTFE. Meanwhile, ignition delay minimized to 117 ms at 8 % PTFE, a 53.01 % reduction compared to 4 % PTFE. Additionally, the contact angle of Mg@8%PTFE was 96.12°, a 38.83° rise from raw Mg, further improving hydrophobicity. Finally, optimal PTFE content was determined to be 8 %. Hence, the Mg@5%PDA@8%PTFE dual-core shell structure was successfully fabricated, with hydrophobicity tests showing a contact angle of 108.54°, a significant 51.25°increase over raw Mg, demonstrating exceptional hydrophobicity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Xueqin Zhu,Minjian Yang,Chunnian Zheng,Qin Zhu,Zhili Cui,Piaopiao Zhang
Exploiting magnesium-based hydrogen storage materials faces great challenges due to their inherent thermodynamic and kinetic characteristics. However, this issue can be mitigated by employing a catalyst doping modification strategy. In this work, a composite of titanium carbide (Ti 3 C 2 T x MXene)-supported nickel fluoride (NiF 2 ) nanoparticles, known as NiF 2 @Ti 3 C 2 , was fabricated via the hydrothermal approach and utilized to reinforce the hydrogen storage performance of magnesium (Mg). It was shown that NiF 2 @Ti 3 C 2 composites have exceptional catalytic properties for Mg hydrogen storage. The Mg–NiF 2 @Ti 3 C 2 composite, containing 5 wt% of NiF 2 @Ti 3 C 2 , released 3.46 wt% of hydrogen at 300 °C, while pure Mg produced essentially little hydrogen in identical conditions. Additionally, there was a decrease in the activation energy of hydrogen desorption from 135.4 to 77.65 kJ mol −1 . Moreover, the composite offered excellent stability and reversible performance, achieving 95.8% capacity retention after 10 consecutive testing cycles. During the hydrogen uptake and release process, the NiF 2 @Ti 3 C 2 composite interacted with Mg/MgH 2 to produce the metals Ti 0 , MgF 2 , and Mg 2 Ni/Mg 2 NiH 4 , which acted as active species to boost the hydrogen storage performance of Mg.
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MATERIALS CHEMISTRY AND PHYSICS
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2024
·
IF 4.3
Xutong Duan,Yongfei Wang,Ruijie Guo,Baolong Niu,Huifang Wang,Hong Yan
To solve the problems of poor corrosion resistance, low adhesion and poor abrasion resistance of general superhydrophobic coatings, A superhydrophobic nano-SiO 2 /N-doped carbon dots ( N -CDs) was prepared on the surface of AZ31B magnesium alloy. The electrolyte consisted of nano-silica particles and N -CDs dispersion, where nano-SiO 2 particles were innovatively added to improve the abrasion resistance of the coating. After the superhydrophobic modification by 1 H ,1 H ,2 H ,2 H -perfluorooctyltriethoxysilane (PTES), the coating exhibited a water contact angle (WCA) of 154° and a rolling angle (RA) of 7°. The analysis undertaken via potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) demonstrated improved electrochemical performance for the coated magnesium alloy samples when compared with uncoated counterparts. The assemblies formed by the coordination of Mg 2+ with the functional groups of N -CD (−NH 2 , –COOH and –OH) were electrodeposited onto the surface of the magnesium alloy matrix, achieving a dense protective film and thereby slowing down the corrosion rate. At the same time, the abrasion resistance test results indicated that the prepared coating possessed excellent abrasion resistance, possessing the ability to resist damage to the coating caused by friction to a certain extent, proposing a new idea for fabricating superhydrophobic coatings with increased abrasion resistance on Mg alloys.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jiaqi Zhu,Guoli Zhang,Lu Lin,Tong Qiu,Wenchao Fu,Fengzhi Liu,Baihua Qu,Dianxiao Jiang,Xiaopeng Lu,Yu Song,Xiao-Xia Liu,Xiaoyuan Zhou,Xiaoqi Sun
Rechargeable Mg batteries have gained great interest thanks to the abundant resources and high theoretical capacity of Mg metal anode. However, it suffers from severe passivation and extremely poor plating/stripping kinetics. Herein, a simple salt electrolyte system of Mg(OTf) 2 /MgCl 2 -DME is studied, and the poor Mg affinities on typical metal current collectors are revealed as the key factor for rapid cell failure. Accordingly, an interphase modification on Cu current collector by the in situ generation of a magnesiophilic Cu-thiourea (CuTU) complex is presented. It provides active sites for solvated Mg 2+ as well as Mg. This not only homogenizes Mg 2+ flux but also helps with the release of solvated species to lower the desolvation barrier. The high affinity with Mg further enables the dense and uniform growth of Mg deposits. Thanks to these merits, the facile and reversible plating/stripping of Mg is realized. As a result, the symmetric cells with Mg pre-deposited on CuTU-Cu electrodes stably operate for over 2600 h, which is a 34-fold increase in comparison to the standard Mg foil. Full cells coupling the Mg-CuTU-Cu anode and a PDI-EDA cathode with an N/P ratio of 3 deliver a high capacity of 251 mAh g −1 as well as stable cycling.
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MATERIALS AND MANUFACTURING PROCESSES
·
2025
·
IF 4.7
Binfeng Pan,Jie Liu,Zhimin Zhang,Xuchen Lu
The process for preparing high-purity anhydrous yttrium chloride was investigated using a complex salt containing an excess of yttrium oxychloride. By studying the conversion of yttrium oxychloride, it was determined that the key to preparing high-purity anhydrous yttrium chloride lay in the synergistic actions of gas-solid and solid-solid reactions. On this basis, a purity control strategy involving the adjustment of the height-diameter ratio of the sample was proposed to inhibit hydrolysis and enhance the conversion rate. By adopting the purity control strategy, high-purity anhydrous yttrium chloride with a yttrium oxychloride content below 0.1 wt.% was obtained at 600°C when the height-diameter ratio of the samples exceeded 1.42. Finally, the experiments on preparing Mg-Y alloys through molten salt electrolysis validated the impact of the YCl3 purity on the electrolysis process. When the high-purity anhydrous yttrium chloride obtained by this strategy was utilized, the current efficiency could reach 83.7%.
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RARE METALS
·
2025
·
IF 11
Zhen-Xuan Ma,Jia-Guang Zheng,Mei-Ling Lv,Cong Li,Chang-Hai Wu,Pan-Pan Zhou,Chao Su,Lei Ge
en This research uncovered the influence of nitrogen-doped MXene Ti 3 CN on the reversible hydrogen storage properties of Mg(BH 4 ) 2 . The Mg(BH 4 ) 2 -20Ti 3 CN composite began releasing hydrogen at a temperature of 80°C. In addition, the composite discharged over 8.8 wt% hydrogen at a comparatively lower temperature of 270°C, whereas the pure Mg(BH 4 ) 2 emitted merely 5.9 wt% hydrogen under identical circumstances, which exhibited remarkably enhanced dehydrogenation kinetics. Furthermore, upon completion of four cycles, Mg(BH 4 ) 2 -20Ti 3 CN retained a reversible hydrogen storage capacity of 4.5 wt%, representing an 80% improvement over the undoped Mg(BH 4 ) 2 . In the course of the dehydrogenation phase, the boron atoms in Mg(BH 4 ) 2 were anchored by nitrogen atoms in Ti 3 CN to form B-N bonds, which helped suppress the formation of MgB 12 H 12 . During the subsequent rehydrogenation process, the B-N bonds broke, and the boron atoms reparticipated in the reversible transformation into [BH 4 ] − clusters. Meanwhile, the formation of Ti 0 by the reaction of Mg(BH 4 ) 2 with Ti 3 CN weakened the B-H bond energy, and the layered structure provided an effective way for hydrogen spillover. These factors collectively improved the reversible hydrogen storage capabilities of Mg(BH 4 ) 2 . 摘要 zh 本研究揭示了氮掺杂MXene Ti 3 CN对Mg(BH 4 ) 2 可逆储氢性能的影响。Mg(BH 4 ) 2 -20Ti 3 CN复合材料在温度80°C时开始放氢。此外,在270°C的较低温度下,该复合材料的氢排放量超过8.8 wt%,而在相同的条件下,纯Mg(BH 4 ) 2 的氢排放量仅为5.9 wt%,脱氢动力学显著增强。在完成四个循环后,Mg(BH 4 ) 2 -20Ti 3 CN保留了4.5 wt%的可逆储氢容量,比未掺杂的Mg(BH 4 ) 2 提高了80%。在脱氢过程中,Mg(BH 4 ) 2 中的硼原子被Ti 3 CN中的氮原子锚定形成B-N键,有助于抑制MgB 12 H 12 的形成。在随后的再氢过程中,B-N键断裂,硼原子重新参与可逆转化为[BH 4 ] − 簇。同时,Mg(BH 4 ) 2 与Ti 3 CN反应生成Ti 0 ,削弱了B-H键能,层状结构也为氢溢出提供了有效路径。这些因素共同提高了Mg(BH 4 ) 2 的可逆储氢能力。
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Sanyang Guo,Zhichao Yu,Yuan Li,Yaokun Fu,Zhuohan Zhang,Shumin Han
Magnesium hydride (MgH 2 ) is a promising hydrogen storage material with high weight and volume hydrogen capacity. However, higher operating temperature and reversible hydrogen capacity decay inhibit its wide application. To address these issues, Mg-Mg 2 Ni/C was obtained by ball milling magnesium and nickel-Metal Organic Framework (Ni-MOF), and following calcinations . Initial dehydrogenation temperature of the composite is 530 K, 70 K lower than that of MgH 2 , and the apparent activation energy of the composite is 77.6 ± 2.1 kJ/mol, which is only 50% of MgH 2 . At 423 K, the hydrogen capacity of the composite is about 6 wt% within 3600 s, and keeps unchanged after ten cycles. The carbon material introduced by Ni-MOF inhibits the agglomeration of Mg, and Mg 2 Ni/Mg 2 NiH 4 acts as a “hydrogen pump” in de/hydrogenation process. The carbon coating and “hydrogen pump” lead to the improvement of the ab/desorption kinetics and cycling stability. This attempt paves a potential way to achieve high performance Mg-based composite hydrogen storage materials.
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