DALTON TRANSACTIONS
·
2026
·
IF 3.3
Chang-Yuan He,Kun Hu,Jing-Yang Zhou,Long Wu,Jian-Han Zhang
Two new Mo-Te-O compounds, (NH₄)₂MgMo₄Te₂O₁₈ and β-MoTe₂O₇, have been synthesized and structurally characterized as frameworks constructed from distorted MoO₆ octahedra and TeO₃ trigonal pyramids with stereochemically active lone pairs.The two phases feature distinct Mo-O-Te connectivities and dimensionalities, leading to different degrees of optical anisotropy. Polarized optical microscopy measurements reveal that both compounds exhibit moderate birefringence, which is further rationalized by density functional theory calculations.The incorporation of Mg²⁺ in (NH₄)₂MgMo₄Te₂O₁₈ results in a more structurally elaborate framework, and this compound shows a black crystal surface with a white interior, indicative of surface-related electronic effects. Combined experimental and theoretical results highlight the role of cooperative MoO₆-TeO₃distortions and framework connectivity in governing optical anisotropy in Mo-Te-O oxides.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 13
·期 6
·120316
·
IF 7.2
Jiahe Sun,Wenyue Hou,Ziyi Ma,Guojun Yin,Hongying Lü,Zhiguo Zhu
Creating highly active Mo-incorporated zeolites for catalytic applications remains a significant challenge in materials synthesis. Traditional hydrothermal methods often struggle to balance rapid crystallization with effective Mo incorporation and control over the resulting material's porosity. This work introduces a novel synthetic strategy based on rapid structural reconstruction to produce high-performance Mo-Beta zeolites. Full crystallinity is achieved in just 3 h at 140 °C, a significant improvement over the conventional approaches. The resulting Mo-Beta materials feature a hierarchical micro- and mesoporous architecture and a tunable Si/Mo ratio (53–202), allowing for optimized catalytic performance. These zeolites demonstrate exceptional activity in the oxidative desulfurization of dibenzothiophene, accomplishing a remarkable mass-specific activity (1.50 h –1 ) and turnover frequency (20.8 h –1 ) under the optimized reaction conditions (10 mL model oil; DBT concentration of 500 μg mL –1 ; H 2 O 2 /DBT = 3; 45 mg catalyst; 60 °C). These metrics significantly exceed those reported for many other heteroatom-containing zeolite catalysts. Moreover, the synthesized Mo-Beta catalyst exhibits excellent stability at the reaction time of 1 h. However, slight activity loss is observed at a short reaction time of 0.25 h after five reaction runs and the catalytic activity can be regenerated by calcination. This rapid structural reconstruction method offers a promising new route for the efficient synthesis of advanced Mo-zeolites and highlights their potential for sustainable catalytic applications.
研究领域:
材料化学
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催化
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无机合成
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环境化学
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石油化学加工
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CHINESE JOURNAL OF CATALYSIS
·
2021
·
IF 8.271
Xue Chen,Ming-Yu Qi,Yue-Hua Li,Zi-Rong Tang,Yi-Jun Xu
The fabrication of efficient catalysts to reduce nitrogen (N 2 ) to ammonia (NH 3 ) is a significant challenge for artificial N 2 fixation under mild conditions. In this work, we demonstrated that the simultaneous introduction of oxygen vacancies (OVs) and Mo dopants into Bi 5 O 7 Br nanosheets can significantly increase the activity for photocatalytic N 2 fixation. The 1 mol% Mo-doped Bi 5 O 7 Br nanosheets exhibited an optimal NH 3 generation rate of 122.9 μmol g −1 h −1 and durable stability, which is attributed to their optimized conduction band position, suitable absorption edge, large number of light-switchable OVs, and improved charge carrier separation. This work provides a promising approach to design photocatalysts with light-switchable OVs for N 2 reduction to NH 3 under mild conditions, highlighting the wide application scope of nanostructured BiOBr-based photocatalysts as effective N 2 fixation systems.
研究领域:
材料科学
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催化
·
光化学
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Energy Technology
·
2023
·Vol. 11
·期 8
·2300118
·
IF 3.8
Peiyao Pan,Qingle Zeng,Xiaoxiao Li,Chao Liu,Jinming Zeng,Tongxiang Liang,Xiaopeng Qi
Electrocatalytic water splitting provides an effective way to store electrical energy (i.e., solar and wind energy) intermittently. It is believed that developing electrocatalysts with excellent stability, high catalytic efficiency, and abundant natural reserves is the key to the industrialization of electrochemical water splitting. Herein, nickel–molybdenum electrocatalyst formed on the surface of a low-cost etched stainless-steel mesh via a one-step electrodeposition method exhibits a low hydrogen evolution overpotential of 53 mV and oxygen evolution overpotential of 261 mV at a current density of 10 mA cm −2 due to the synergistic effect of nickel and molybdenum. Moreover, the as-prepared catalyst demonstrates superior hydrogen evolution reaction (HER) catalytic performance than commercial Pt/C at current density exceed 200 mA cm −2 . The electrocatalyst also shows excellent HER and oxygen evolution reaction stabilities at high current density attribute to the tightly bond between electrocatalyst and the etched stainless-steel mesh, as well as the surface reconstruction of catalyst during the cycle test. The facile electrodeposition method has lower requirements on production equipment, using stainless steel mesh as the basement reduces the production cost, the nickel–molybdenum alloy possesses excellent electrolytic water splitting performance and stability. These results indicate that this work can provide an idea for the industrialization of electrochemical water splitting.
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Nano Research
·
2023
·
IF 9.9
Wang Yaya,Wen Yunzhou,Cheng Yumeng,Chen Xinhong,Zhuansun Mengjiao,Wang Tongbao,Li Jun,Meira Debora,Sun Huarui,Wei Jun,Zhou Jia,Wang Yuhang,He Sisi
The polymer electrolyte membrane (PEM) electrolyzers are burdened with costly iridium (Ir)-based catalysts and high operation overpotentials for the oxygen evolution reaction (OER). The development of earth-abundant, highly active, and durable electrocatalysts to replace Ir is a critical step in reducing the cost of green hydrogen production. Here we develop a Ru 5 Mo 4 O x binary oxide catalyst that exhibits high activity and stability in acidic OER. The electron-withdrawing property of Mo enriches the electrophilic surface oxygen species, which promotes acidic OER to proceed via the adsorbate evolution pathway. As a result, we achieve a 189 mV overpotential at 10 mA·cm −2 and a Tafel slope of 48.8 mV·dec −1 . Our catalyst demonstrates a substantial 18-fold increase in intrinsic activity, as evaluated by turnover frequency, compared to commercially available RuO 2 and IrO 2 catalysts. Moreover, we report a stable OER operation at 10 mA·cm −2 for 100 h with a low degradation rate of 2.05 mV·h −1 .
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Materials Today Chemistry
·
2022
·
IF 7.613
Y. Qu,L. Sun,F. Xie,J. Hu,H. Tan,J. Qian,X. Shi,Y. Zhang
A major challenge faced by NiS as positive electrode material for supercapacitors is the capacity attenuation caused by structural changes in the charging and discharging process. In this article, based on theoretical calculations and experimental studies, it is demonstrated that Mo doping can significantly improve the stability and specific capacitance of NiS for supercapacitor application. Experiments show that compared with original NiS/C, the cycle stability of the doped Mo-NiS/C increases by about 30% after 5,000 cycles, and the specific capacitance achieves 1,852 F/g at 1 A/g. Besides, Mo doping can bring better ion contact and increased reaction site to the original lamellar structure of NiS. The calculation results also show that the bond energy of the doped Mo-NiS/C is lower than that of the original NiS/C, which hinders the structural transformation or other side reactions and achieves a better cycle life. This article verifies the effect of Mo doping on the properties of NiS/C and provides a feasible scheme for the study of metal-doped sulfide.
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CHEMOSPHERE
·
2022
·
IF 8.943
Yi Zhou,Jun Ma,Jianhong Yang,Zhicheng Lv,Zhiyong Song,Heyou Han
With the wide application of nanomaterials (NMs) in agriculture, it is particularly important to assess the impact of these NMs on soil microorganisms . In this study, different varieties of soybean rhizosphere microorganisms (RM) were employed to simulate the alleviate effect of molybdenum nanoparticles (Mo NPs) induced stress in presence of soybean plants. Mo NPs caused serious toxic effects on soybean growth and nitrogen fixation at a concentration of 100 mg kg −1 : plant height and biomass were reduced by 56.4% and 82.8%, respectively, and the ability to fix nitrogen was almostly lost. However, after adding different varieties of soybean RM ( RM-Williams 82 , RM-Youchun 1204 , and RM-Zhongdou 41 ), the stress caused by high concentrations of Mo NPs on soybean plants was significantly reduced. The plant height, root length, biomass, and nitrogen fixation ability were improved by 70.8%, 80.7%, 145.8%, and 349.8%, respectively, following the addition of soybean RM-Williams 82 . High-throughput sequencing revealed that Mo NPs treatment affected the microbial community structure. Among them, Flavisolibacter and Caulobacter genera abundance increased significantly, which might be the key factor in relieving Mo NPs-induced stress on soybean growth. These findings suggest a novel mode of RM as a promising strategy to prevent deleterious effects of stress with NPs on plants in the future.
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高影响因子
FUEL
·
2022
·
IF 8.035
Mingqiang Chen,Wei Dai,Yishuang Wang,Zhiyuan Tang,Hong Li,Chang Li,Zhonglian Yang,Jun Wang
Lignin catalytic depolymerization (LCD) into liquid fuels and aromatic chemicals in supercritical ethanol systems is one of the most effective strategies for efficient utilization of biomass resources. In this study, a series of sepiolite (SEP) supported Mo-Mn catalysts with different Mn/Mo ratios were prepared and applied to LCD. Experimental results for lignin and 2-phenoxy-1-phenyl ethanol (PP) confirmed that Mo/Mn species promoted the breakage of β-O-4 bonds, Mn additive effectively inhibited the alkylation of intermediates, and Mn/Mo ratios distinctly affected the yields of lignin oil (LO) and guaiacols. All as-prepared Mn-Mo/SEP catalysts achieved approximately 100 % conversions of lignin and PP. Various characterization results demonstrated that Mn/Mo ratios could regulate the particle sizes of metal oxides as well as the concentration of oxygen vacancies (O V ) and surface acidic sites. In 3Mn1Mo/SEP, the appropriate interaction among SEP , Mn and Mo species reduced the particle sizes of metal oxides and rendered the crystalline phase structure in a relatively complex state, which undoubtedly generated massive steps/corners on its surface and then enhanced the hydrogenation reaction. Furthermore, the 3Mn1Mo/SEP contained many O V and suitable distribution of Lewis and Brønsted acid sites, which facilitated the adsorption of oxygen-containing intermediates and further hydrogenation and deoxygenation. Therefore, 3Mn1Mo/SEP achieved 45.7 % of LO yield with an HHV of 32.31 MJ/Kg and the highest selectivity to phenols (85.61 %) and yield of guaiacols (308.9 mg/g lignin). In addition, the plausible reaction network for LCD was proposed based on the results of experiments and characterizations.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Dezhi Wang,Dongyang He,Kai Li,Zhuangzhi Wu
The strength enhancement is critical for the application exploration of Mo-based materials. In this work, a secondary phase of WC is introduced into the Mo matrix, and the corresponding phase, microstructure and mechanical properties have been studied. It is found that the addition of WC particles can significantly improve the mechanical properties, leading to a high ultimate tensile strength (UTS) of 591.5 MPa and a hardness of 242.7 HV over the sintered Mo–12%WC composite, which are about 21.2% and 49.5% higher than those of pure Mo, respectively. During the sintering, the additive WC particles react with the Mo matrix to in-situ generate W and Mo 2 C, and the former is dissolved into the Mo matrix to exhibit solid solution strengthening. Besides, the latter hinders the migration of grain boundaries (GBs) to limit the grain growth of Mo, resulting in smaller grain size. More importantly, the Mo 2 C ( 1 ‾ 2 ‾ 1 ) can gain coherent interfaces with Mo ( 1 1 ‾ 0) to intensify the phase boundary. This work paves a way for the design of high-performance composites through the in-situ reinforcement of decomposable additives.
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CATALYSIS LETTERS
·
2022
·Vol. 153
·期 2
·1-11
·
IF 2.936
Jilei Liang,Mengmeng Wu,Nianqing Zhu,Xinxing Gao,Guanxing Zhu,Tingting Huang,Yunqi Liu,Chenguang Liu
With the help of hydrogen bonding and π⋯π stacking, the small molecular clusters in the impregnating solution was induced to self-assemble and form a new Ni–Mo polyoxometalate based on octamolybdate with a molecular formula of [Ni(pyz) 6 ] [Mo 8 O 26 (pyz) 2 ]⋅10H 2 O (pyz = pyrazole). The polyoxometalate was structurally characterized detailed by various technologies, and its sulfide was also characterized to make a preliminary study to explore the use of it as a potential NiMoS active phase precursor. Much more NiMoS active phase and higher catalytic activity of the Ni–Mo sulfided catalyst was found, and the structure-directing effects can account for the phenomenon. The results show the Ni–Mo polyoxometalate [Ni(pyz) 6 ] [Mo 8 O 26 (pyz) 2 ]⋅10H 2 O can make a superior precursor to prepare the hydrodesulfurization catalyst, and it provides a new preparation methodology to the rational design and controllable preparation of superior hydrodesulfurization catalysts. Graphical Abstract
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Qian Qi,Wei Ji,Qiunan Li,Wanjun Li,Jinyong Zhang,Weimin Wang,Zhengyi Fu
The materials used in astronautics fields are usually designed to withstand severe thermal stress induced by large temperature differences. Compared with homogenous materials, functionally graded materials (FGM) possess gradient properties and can be applied in harsh operating conditions. In this study, ZrC–Mo multilayer FGM were designed and prepared with three gradient compositions. The as-produced ZrC–Mo FGM exhibited the dense and homogeneous morphology and excellent interlayer bonding without visible defects such as cracks and pores. The results of oxyacetylene ablation tests indicated that compared with homogeneous ZrC-based composites, the ZrC–Mo FGM could better maintain integrity and avoid catastrophic damage. An effective property transition was established by the gradient design, which could relieve the stress caused by the difference in thermal expansion coefficient between ceramic and metal materials. The FGM in the composition of quadratic function nonlinear with higher Mo content show the optimized overall performance. The study provides a new strategy for developing promising candidate materials under ultra-high temperature conditions.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zhi Dong,Songhua Chen,Shaocun Liu,Zongqing Ma,Liming Yu
As a promising route to prepare ultrafine-grained or nanocrystalline materials, powder metallurgy has long been used to produce some metal materials with desirable microstructure. However, the challenges of rapid grain growth and torpid densification during this process always frustrate the endeavor. Especially, for the oxide dispersion strengthened (ODS) alloy, although grain growth is suppressed greatly by the traditional oxide addition, the densification of metal matrix is also hindered, especially at low temperature. To overcome such limitation, exploring a kind of oxide that can be used as both grain growth inhibitor and sintering accelerator for metal matrix will be significant. In this work, it is found that accelerated sintering can be achieved in Mo-ZrO 2 system at low temperature. The kinetic simulation results indicate that although the volume diffusion has been found to be the dominant sintering mechanism for Mo-ZrO 2 system, a significant contribution from grain boundary diffusion is also identified, which is the essential mechanism behind the accelerated sintering of this system at low temperature. Besides, the grain boundary migration also can be significantly restricted by the intergranular ZrO 2 particles. After sintering at only 1480 °C in the absence of external pressure assistance and subsequent hot forging , nanocrystalline microstructure with an average grain size of 480 nm can be obtained. The ZrO 2 second-phase particles are uniformly distributed at grain interior and grain boundaries, enhancing the recrystallization temperature and microstructural stability of metal matrix, which renders the prepared Mo-ZrO 2 alloy a stable high-strength performance characteristic even under high temperatures.
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