INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2024
·
IF 4.2
Xiao Liu,Lu Wang,Zheng-Liang Xue
The hydrogen reduction of MoO 2 is a common method for preparing ultrafine molybdenum powder, which is an important basic material for manufacturing high-performance Mo-based alloys. However, its preparation parameters are usually hard to be controlled. To address this issue, the work conducted the parameter optimization research during the hydrogen reduction process with using central composite design method, and the influence of different parameters such as reaction temperature, yttrium content, and hydrogen flow rate, on the particle size and oxygen content of the prepared molybdenum powder were investigated. The findings showed that the particle size of the prepared molybdenum powder is gradually decreased with the increase of reaction temperature and yttrium content, while gradually increased with the increase of hydrogen flow rate. The oxygen content of the prepared molybdenum powder is gradually decreased with the increase of reaction temperature and hydrogen flow rate, while gradually increased with the increase of yttrium content. Reaction temperature and yttrium content have significant interactions on the particle size and oxygen content are also concluded, and their respective regression model equations are obtained. The result also demonstrated that the particle size and oxygen content of the prepared molybdenum powder had a certain contradictory relationship. Through the comprehensive analysis, the optimal parameters for preparing ultrafine molybdenum powder with a low oxygen content are deduced, that is, reaction temperature: 1200 K, yttrium content: 0.1 mass%, and hydrogen flow rate: 1000 mL/min. Under the conditions, the average particle size and oxygen content of the prepared molybdenum powder are 320 nm and 0.456 mass%, respectively.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Environmental Technology & Innovation
·
2024
·
IF 6.7
Binbin Wu,Zheng Wang,Yannan Jia,Nannan Xu,Lisha Liao,Chenyue Zhang,Zhiwei Wang,Yuanxiang Shan,Wanting Feng,Hongqin Xue
Biochar loaded with bimetallic Fe/Mo (Fe/Mo-BC) was prepared as a cost-effective catalyst for the degradation of organic matter by activated peroxydisulfate, in which MoO 2 was used as a co-catalyst to enhance Fe 2+ /Fe 3+ cycling. The tetracycline-degradation efficiency of the system reached 74.49 % within 10 min, and it showed high removal rates over a wide pH range (3–9). Quenching experiments and electron paramagnetic resonance analyses showed that 1 O 2 , •OH, O 2 • - , and SO 4 • − produced by the Fe/Mo-BC/PDS system are involved in tetracycline degradation, with 1 O 2 and •OH being the dominant active substances. X-ray photoelectron spectroscopy analysis revealed that Mo(IV) reduces Fe 3+ to Fe 2+ and oxidizes itself to Mo(VI). In addition, the Fe/Mo-BC remained stable and could be recycled three times, indicating the feasibility of this system for practical applications. The possible pathways of TC degradation by this system were investigated by LC-MS and DFT calculations. Thus, the present study provides a feasible strategy for the use of biochar-loaded bimetallic materials and PDS for the degradation of organic matter.
研究领域:
环境科学
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污染控制
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Xiaohu Song,Yaru Ren,Wei Qin,Heng Wang,Yaping Zeng,Ming Li
Lithium-sulfur batteries (LSBs) are regarded as potential candidates for next-generation energy storage technologies, however, their practical applications are limited by the dual constraints of shuttle effect of lithium polysulfides (LiPSs) and slow catalytic reaction kinetics. To address these issues, a metal-organic framework (MOF)-derived composite Co 2 Mo 3 O 8 -MoO 2 heterojunction (Mo-Co@C) loaded on carbon nanorod clusters was designed. The heterojunction showed a low d -band center level and higher d -band density of state (DOS), and the inside built-in electric field can significantly enhance the adsorption of LiPSs and effectively inhibit the occurrence of the shuttle effect. In addition, the nanorod-like cluster formed by the self-assembly process of bimetallic organic framework exhibits a high specific surface area, which not only provided more active centers, but also the transport channel for lithium ions migration, and promoted the enhancement of the redox reaction kinetics simultaneously. The battery with the Mo-Co@C composites as a separator-mediator exhibited initial discharge capacity of 895.7 mAh g −1 at 1 C, and it still maintains a reversible capacity of 402.4 mAh g −1 after 1000 cycles, which corresponds to a capacity degradation rate of 0.055% per cycle. The capacity can still reach 501.3 mAh g −1 at 0.5 C even at a low-temperature of −20 °C. This work provides new insights for the design of catalysts for high-performance lithium-sulfur batteries.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Yanping Xie,Geng Zhao,Dongli Xu,Xiaofeng Yin,Liang Fang
The construction of heterogeneous interface is considered as an efficient approach to improve the intrinsic catalytic activity of hydrogen evolution electrocatalysts. Here, a self-supported heterostructured electrocatalyst (Ni-MoO 2 /WO 2 ) is fabricated by anchoring porous Ni-MoO 2 /WO 2 nanoflakes with a densely intermediate layer of Ni-MoO 2 /WO 2 nanoparticles on Ni foam through a three-step procedure involving corrosion, hydrothermal and annealing treatment. The Ni-MoO 2 /WO 2 heterostructure can modulate the interfacial electronic state and accelerate the reaction kinetics. The middle layer tightly anchors the catalytic layer to the substrate, preventing the detachment of the catalyst under high current density. The Ni-MoO 2 /WO 2 electrode exhibits a low overpotential of 30 mV at 10 mA cm −2 , a small Tafel slope of 63 mV dec −1 and excellent catalytic stability at 50 mA cm −2 beyond 50 h toward the hydrogen evolution reaction in alkaline solution. This work presents a new strategy to develop non-precious electrocatalysts with high performance for alkaline HER.
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高影响因子
ChemSusChem
·
2026
·Vol. 19
·期 15
·e70941
·
IF 5.9
Rahmat Ullah,Jinshan Cheng,Sheraz Muhammad,Sumayya Khan,Huaifeng Li,Ali Aman,Ke Zhang,Tayirjan Taylor Isimjan,Shohreh Azizi,Xiulin Yang
Developing robust, efficient oxygen evolution catalysts is essential to advancing alkaline water electrolysis and sustainable hydrogen production. Herein, we present a vacancy-engineered MoO 2 /Fe 3 O 4 -Mel nanorod composite, grown on nickel foam via a one-step solvothermal strategy. The catalyst possesses abundant oxygen vacancies and strongly coupled MoO 2 /Fe 3 O 4 heterointerface, while the nitrogen-rich melamine framework promotes electronic modulation of Fe active centers. During electrochemical activation, it undergoes surface reconstruction to generate an FeOOH active phase and oxygen vacancies promote interfacial charge redistribution. These structural and electronic features accelerate charge transfer and facilitate the adsorption and conversion of oxygenated intermediates during oxygen evolution reaction (OER). As a result, the optimized MoO 2 /Fe 3 O 4 -Mel catalyst delivers ultra-low overpotential of 217 mV at 100 mA cm −2 , a small Tafel slope of 70 mV dec −1 , and maintains stable operation for 150 h. In situ Raman and in situ Fourier transform infrared spectroscopy reveal vacancy-associated surface reconstruction and dynamic oxygenated intermediate evolution, while tetramethylammonium and pH-dependent studies confirm an adsorbate evolution mechanism. A two-electrode MoO 2 /Fe 3 O 4 -Mel (+) ||Pt/C (−) electrolyzer achieves a low cell voltage of 1.45 V at 100 mA cm −2 with negligible degradation over 100 h. This work highlights the effectiveness of interfacial electronic modulation and oxygen vacancy engineering for high-performance alkaline OER catalysts. Graphical A vacancy-engineered MoO 2 /Fe 3 O 4 -Mel nanorod catalyst was synthesized and delivered good oxygen evolution reaction (OER) activity (217 mV@100 mA cm −2 ), long-term stability, and robust overall water splitting (1.45 V@100 mA cm −2 ). Operando spectroscopic studies reveal oxygen vacancy-assisted dynamic FeOOH reconstruction and active site modulation, while complementary chemical probing suggests that OER proceeds via an adsorbate evolution mechanism.
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Maoheng Fei,Zixun Huang,Caiyu Ge,Zhifang Liu,Jiejun Li,Xiang Ye,Yixi Xie,Pengcheng Zhao,Junjie Fei
The development of efficient and sensitive electrochemical sensors for caffeic acid (CA) detection is critical for food safety and human health monitoring. However, conventional metal-organic framework (MOF) derivatives often suffer from particle agglomeration and limited electrical conductivity. Herein, we propose a novel in-situ growth strategy to construct a core-shell Co-MoO 2 @C composite, which is further integrated with multi-walled carbon nanotubes (CNTs) to achieve a “dispersive-supportive-catalytic” trifunctional sensing platform. Specifically, ZIF-67 was grown in situ on MoO 3 nanorods to form a core-shell MoO 3 @ZIF-67 precursor. Upon pyrolysis, this unique structure effectively prevented the agglomeration of Co nanoparticles and generated abundant Co-Mo-O active sites and heterojunction interfaces. The subsequent incorporation of CNTs not only constructed a highly conductive network but also significantly increased the electroactive surface area (3.65 mm 2 ) and adsorption capacity (1.744 nM·cm −2 ) via synergistic effects. The limit of detection (LOD) of the Co-MoO 2 @C/CNTs/GCE sensor for CA was 8.4 × 10 −10 M under the most suitable conditions. This work provides a new paradigm for designing MOF-oxide‑carbon ternary composites for advanced electrochemical sensing applications.
研究领域:
电化学
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材料科学
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传感器与生物传感器
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纳米复合材料
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环境与食品分析
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DOI
高影响因子
ENERGY
·
2021
·
IF 7.147
Yi-Jie Zhang,Yi-Jun Gao,Xiaoge Wang,Qin Ye,Ya Zhang,Yu Wu,Shu-Han Chen,Bo Ruan,Dean Shi,Tao Jiang,Fang-Chang Tsai,Ning Ma
Sodium-ion batteries (SIBs) are highly potential for next-generation electrochemical energy storage because of their abundant resources and low prices. Transition metal dichalcogenides (TMDCs) have an excellent capacity, high electrical conductivity, and diverse structures. However, its volume expansion and tendency to restack during charge/discharge cycles lead to inferior electrochemical properties, limiting its development in the battery field. Herein, we synthesized MoO 2 /NC rods covered with MoTe 2 nanosheets on the surface (MoTe 2 @MoO 2 /NC) by a high-temperature solid-phase synthesis method based on Mo-MOF a sacrificial template for sodium-ion batteries. The MoO 2 core enhances the electron transfer efficiency as a conductive backbone and prevents the volume expansion of MoTe 2 nanosheets. Meanwhile, the MoTe 2 nanosheets are tightly wrapped around the MoO 2 core, significantly reducing the ion diffusion path. Furthermore, the C and N doped substrates with conductivity ensure the integrity of the structure and enhance the conductivity of the electrodes. Benefiting from these advantages, MoTe 2 @MoO 2 /NC delivered a high electrochemical performance with high capacity (∼463.9 mAh g −1 ), superior fast-charge discharge ability (∼294.7, and 258.3 mAh g −1 at 5, and 10 A g −1 , respectively). Even at a high current density of 1 A g −1 , the specific capacity was maintained at about 328.3 mAh g −1 after 100 cycles.
研究领域:
材料科学
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储能
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电化学
·
纳米材料
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Lin Zhang,Yibing Sun,Zhichao Yang,Hongchao Li
MoO 2 has been extensively recognized as an efficient cocatalyst in Fe-based Fenton-like systems. However, current understanding has predominantly limited its functional role to that of a reducing agent. This study elucidates a previously unexplored mechanism involving surface interaction-mediated self-sustained Fe redox cycling in MoO 2 -cocatalytic Fe(III)/peroxymonosulfate (PMS) system. Experimental findings demonstrate the formation of multiple reactive species (i.e., free radicals and high-valent iron-oxo species (Fe IV =O), leading to differential degradation efficiencies for various pollutants (i.e., higher than 96.5 % for sulfamethoxazole, phenol, benzoic acid, atrazine, and carbamazepine, and 28.9 % for p -nitrobenzoic acid). Notably, the observed PMS decomposition efficiency exceeds the stoichiometric reduction capacity of MoO 2 , thereby challenging the conventional perception of its sole function as a sacrificial electron donor. Kinetic analyses further reveal that Fe(II), generated via the reduction of Fe(III) by MoO 2 , accounts for less than 27.8 % of the total PMS decomposition. Instead, the surface-adsorbed Fe(III) (Fe(III) sur ) on MoO 2 is identified as the dominant active site for PMS activation, preferentially yielding Fe IV O as the key reactive intermediate. Based on these observations, we propose that MoO 2 not only serves as a reducing agent but, more importantly, might play as a ‘solid ligand’ that regulates the reaction activity and pathway of Fe(III) with PMS. This work provides critical insights into the design of self-sustaining Fenton-like systems for wastewater treatment.
研究领域:
环境化学
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环境工程
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催化化学
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水污染控制
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材料化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yiyang Mao,Yingying Hu,Jun Shen,Renxin Wang,Huihui Zhang,Ruilin Wang,Pei Zhao,Baofeng Wang
Hybrid Mg 2+ /Li + batteries (MLIBs) are a promising battery system that combines the advantages of fast lithium-ion kinetics and dendrite-free magnesium deposition. Layered molybdenum disulfide (MoS 2 ) has gained increasing interest due to larger layer spacing and weak van der Waals forces in MLIBs. However, poor intrinsic electronic conductivity hinders its practical application. Here, a highly conductive MoS 2 /MoO 2 /reduced graphene oxide (MoS 2 /MoO 2 /rGO) composite synthesized via a facile hydrothermal method is employed as a high-performance cathode material for MLIBs. The high electrical conductivity (7.5 ×10 −3 S cm −1 ) and large specific surface area of MoS 2 /MoO 2 /rGO facilitate the rapid transport of interfacial electrons and provide abundant active sites for Mg 2+ /Li + storage. The optimized MoS 2 /MoO 2 /rGO composite exhibits a high discharge capacity (297.3 mAh g −1 ) and excellent rate performance. Moreover, the composite electrode delivers ultra-long cycle life over 5000 cycles at 1000 mA g −1 , with a capacity degradation rate of only 0.007 % per cycle. The results offer valuable insights for the development of highly conductive MoS 2 -based composites.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
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IF 3.582
Ying Zhou,Shengnan Wei,Siyi Li,Xudong Liu,Xiaoqing Shu,Xu Zhang,Cheng Zhao,Zepeng Qu,Dawei Fang,Zhaohong Zhang,Jun Wang
By using TiO 2 and Ta 2 O 5 colloids, a stable and efficient visible-light driven photocatalyst , Er 3+ :Y 3 Al 5 O 12 /TiO 2 Ta 2 O 5 /MoO 2 composite membrane , was successfully prepared via sol–gel dip coating method at room temperature . The XRD , FTIR, SEM , TEM and EDX results confirm that approximately spherical Er 3+ :Y 3 Al 5 O 12 nanoparticles were embedded in TiO 2 Ta 2 O 5 matrix. UV–vis absorption and PL spectra of Er 3+ :Y 3 Al 5 O 12 were also determined to confirm the visible absorption and ultraviolet emission. The photocatalytic hydrogen generation was carried out by using methanol as sacrificial reagent in aqueous solution under visible-light irradiation. Furthermore, some main influence factors such as heat-treated temperature, heat-treated time and molar ratio of TiO 2 and Ta 2 O 5 on visible-light photocatalytic hydrogen generation activity of Er 3+ :Y 3 Al 5 O 12 /TiO 2 Ta 2 O 5 /MoO 2 composite membrane were studied in detail. The experimental results showed that the photocatalytic hydrogen generation activity of Er 3+ :Y 3 Al 5 O 12 /TiO 2 Ta 2 O 5 /MoO 2 composite membrane heat-treated at 550 °C for 3.0 h was highest when the molar ratio of TiO 2 and Ta 2 O 5 was adopted as 1.00:0.50. And that a high level photocatalytic activity can be still maintained after four cycles. In addition, a possible mechanism for the visible-light photocatalytic hydrogen generation of the Er 3+ :Y 3 Al 5 O 12 /TiO 2 Ta 2 O 5 /MoO 2 membrane was proposed based on PL spectra.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
Small Methods
·
2021
·Vol. 5
·期 11
·2100765
·
IF 14.188
Ruizhe Li,Wujie Dong,Jun Pan,Fuqiang Huang
The transition metal oxides (TMOs) with high volumetric capacities are promising anodes for the future electronics, however, they usually suffer from severe capacity decay and poor rate capability. Carbon hybridization and nanosizing can resolve these challenges, yet these significantly compromise the volumetric capacity. Herein, both high capacity and long cycling stability are simultaneously achieved in the micrometer-sized Mo-based oxide particles by designing the dual conductive MoO 2 /β-MoO 3- x mosaics. The rational combination of the highly electronically conductive MoO 2 with the highly ionically conductive and open-structured β-MoO 3 achieves a promising volumetric capacity of 1742 mAh cm −3 , which is four times higher than the commercial graphite. Simultaneously, both stable cycling performance (87% retention after 500 cycles) and excellent rate capability (outperformed a majority of the MoO 2 -based anodes reported in literature) are obtained in the lithium-ion batteries. For the sodium-ion batteries, the composite exhibits three times higher Na + storage than pure MoO 2 . Moreover, the decisive role of the bond energy on the electrochemical performance of TMOs is also identified. This study may open up new perspectives for choosing and designing the TMO anodes with a high volumetric capacity for the practical applications.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
Chemistry-An Asian Journal
·
2022
·Vol. 18
·期 2
·e202201139
·
IF 4.839
Fengyun Su,Zhishuai Wang,Mengzhen Tian,Chunxia Yang,Haiquan Xie,Chenghua Ding,Xiaoli Jin,Jiaqi Chen,Liqun Ye
Graphical MoO 2 /g-C 3 N 4 composites were prepared, in which MoO 2 synergetic with Pt photo-deposited during H 2 evolution reaction worked as unilateral dual cocatalyst to improve the photocatalytic activity. The deficient MoO 2 not only promoted visible light absorption of g-C 3 N 4 , but also worked as a “electron pool” to capture and transfer electrons to Pt. Pt is usually used as cocatalyst for g-C 3 N 4 to produce H 2 by photocatalytic splitting of water. However, the photocatalytic performance is still limited by the fast recombination of photo-generated electrons and holes, as well as the poor absorption of visible light. In this work, MoO 2 /g-C 3 N 4 composites were prepared, in which MoO 2 synergetic with Pt photo-deposited during H 2 evolution reaction worked as unilateral dual cocatalyst to improve the photocatalytic activity. Within 4 hours of irradiation, the hydrogen production rate of MoO 2 -Pt dual cocatalyst modified g-C 3 N 4 reached 3804.89 μmol/g/h, which was 120.18 times of that of pure g-C 3 N 4 (GCN, 31.66 μmol/g/h), 10.98 times of that of MoO 2 modified g-C 3 N 4 (346.39 μmol/g/h), and 9.18 times of that of Pt modified g-C 3 N 4 (413.64 μmol/g/h). Characterization results demonstrate that the deficient MoO 2 not only promoted visible light absorption of g-C 3 N 4 , but also worked as a “electron pool” to capture and transfer electrons to Pt.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）