JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 6
·2804-2817
·
IF 3.9
Tang Kai,Chen Siyuan,Wang Xuchun,Zhang Xueru,Zhang Yong,Ke Xiang,Xu Xinru,Wu Tao,Wang Bingxin,Li Shasha
MoO 2 is a promising material for efficient and cost-effective electrocatalytic water splitting, particularly for the oxygen evolution reaction (OER) in alkaline media. Modifying the morphology, composition, or oxidation state of MoO 2 can enhance its active surface area and performance. In this study, Mo-coated carbon paper was used as a substrate to synthesize well-organized MoO 2 nanowires and nanosheets via a one-step CVD method without any catalyst. The nanosheets and nanowires grow perpendicularly to the substrate. MoO 2 nanowire arrays exhibit superior OER performance, characterized by a lower onset potential (1.54 V), a smaller Tafel slope, and enhanced durability compared to nanosheets. This improvement is likely attributed to the increased number of exposed active sites, reduced presence of oxidized Mo 4+ , and smaller crystalline size. Graphical abstract Here, well-organized MoO 2 nanowires and nanosheets have been fabricated on carbon paper using a one-step CVD method by reducing MoO 3 with Mo powder to investigate the intrinsic relationship between morphology, elemental composition and state, and their electrocatalytic properties. The obtained nanosheets presented as a flower-like structure, while nanowires formed into well-aligned arrays. MoO 2 nanowires contained higher amounts of Mo 4+ , were composed of smaller crystal grains, and possessed a lower onset potential for OER (oxygen evolution reaction) at about 1.54 V, a smaller Tafel slope at about 110 mV/dec, and better durability when compared to MoO 2 nanosheets.
研究领域:
材料科学
·
电催化
✓ 已验证
DOI
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 4
·1195-1204
·
IF 8.8
Dong Wei,Zhou Shi-An,Ma Yan,Chi Dian-Jun,Chen Rong,Long Hong-Ming,Chun Tie-Jun,Liu Sheng-Jun,Qian Fu-Ping,Zhang Kui
Designing a heterojunction photocatalyst to improve the separation efficiency of photogenerated electrons and holes is of great significance to improve the hydrogen production efficiency. In this work, we report a rational design to grow ZnIn 2 S 4 on Mo-MOF-derived N-doped C-coated MoO 2 (MOZIS), and it has excellent photocatalytic hydrogen production with triethanolamine (TEOA) as sacrificial agent. N-doped C improves the electron transport efficiency between MoO 2 and ZnIn 2 S 4 . The systematic study shows that MOZIS has good properties to promote the effective separation and transfer of photocatalytic charges, which is attributed to the tight contact interface and good energy band structure between MoO 2 and ZnIn 2 S 4 . The optimized nanocomposites have a high hydrogen production efficiency of 10.89 mmol·g −1 (4 h) under visible light. MOF-derived N-doped C-coated MoO 2 is an effective strategy to improve the photocatalytic hydrogen production efficiency of ZnIn 2 S 4 . Graphical abstract
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 21
·7178
·
IF 4.927
Yan Chen,Ao Li,Xiuli Fu,Zhijian Peng
The difficulty of exposing active sites and easy recombination of photogenerated carriers have always been two critical problems restricting the photocatalytic activity of g-C3N4. Herein, a simple (NH4)2MoO4-induced one-step calcination method was successfully introduced to transform bulk g-C3N4into g-C3N4/MoO2composites with a large specific surface area. During the calcination, with the assistance of NH3and water vapor produced by ammonium molybdate, the pyrolytical oxidation and depolymerization of a g-C3N4interlayer were accelerated, finally realizing the exfoliation of the g-C3N4. Furthermore, another pyrolytical product of ammonium molybdate was transformed into MoO2under an NH3atmosphere, which was in situ loaded on the surface of a g-C3N4nanosheet. Additionally, the results of photocatalytic hydrogen evolution under visible light show that the optimal g-C3N4/MoO2composite has a high specific surface area and much improved performance, which is 4.1 times that of pure bulk g-C3N4. Such performance improvement can be attributed to the full exposure of active sites and the formation of abundant heterojunctions. However, with an increasing feed amount of ammonium molybdate, the oxidation degree of g-C3N4was enhanced, which would widen the band gap of g-C3N4, leading to a weaker response ability to visible light. The present strategy will provide a new idea for the simple realization of exfoliation and constructing a heterojunction for g-C3N4simultaneously.Keywords:g-C3N4;MoO2;exfoliation;photocatalytic hydrogen evolution
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICA B-CONDENSED MATTER
·
2021
·
IF 2.436
Qilin Gong,Qingsong Huang
Recently, the moiré superlattice structure (MSS) has garnered increasing attention thanks to its extensive research potential in condensed matter physics . However, how to create MSSs on non-van der Waals crystal plates is still elusive. In the present study, we propose a new method to prepare MSSs on the MoO 2 (010) surface by soaking MoO 2 in sulfur vapour at high temperature. MoO 2 is 2D non-layered materials and is prepared by annealing MoO 3 with sulfur vapour at 500 °C. The torsional modulation between two stacked monolayers is periodic, which provides additional freedom to change the material properties . Under sulfur vapour, the surface atoms of MoO 2 first change from monoclinic to tetragonal crystals, and the interlayer covalent bonds are broken at the same time. Then, the top layer and buffer layer atoms of MoO 2 form the original MSS, and the top layer continue to rotate into different twisted angles. Our work provides some inspiration and reference to the preparation of MSSs on the surface of the other 2D non-van der Waals crystals. In addition, we further compared the wettability of MSS@MoO 2 and ordinary MoO 2 powder. The results show that the surface of MSS@MoO 2 is strongly hydrophobic (approximately 140°), while that of ordinary MoO 2 is superhydrophilic (4.3°). Our results suggest that MSSs may be a potential application to change the surface wettability of materials.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2014
·
IF 2.129
Hao Gao,Chun-Ling Liu,Yang Liu,Zong-Huai Liu,Wen-Sheng Dong
In this study, novel MoO 2 -loaded porous carbon hollow sphere composite materials were synthesized. The composites consisted of homogeneous hollow microspheres with a size of ∼0.7 ± 0.1 μm and a shell thickness of ∼70 nm; MoO 2 nanoparticles with an average size of ∼12 nm were uniformly dispersed in the shells of the porous carbon hollow spheres (PCHS). The MoO 2 /PCHS composites showed high capacity and excellent capacity retention when they were applied as an anode material for Li ion batteries . The composite containing 44.2% of MoO 2 revealed a reversible capacity of 574 mAh g −1 at a current density of 50 mA g −1 , and a first coulombic efficiency of 61%. After 80 cycles, this composite still retained a capacity of 640 mAh g −1 . The good electrochemical performance could be due to the fact that the MoO 2 nanoparticles were homogeneously embedded in the shells of the porous carbon hollow spheres in the composites, which effectively prevented volume change or aggregation of the MoO 2 nanoparticles during the lithium ion insertion/extraction process. The porous carbon hollow spheres with good electronic conductivity and high surface area offered a large electrode/electrolyte contact area, and a short path length for the Li + transport.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Xuefei Wu,Junxiang Chen,Zhenhai Wen
To explore highly active non-noble electrocatalysts toward full water splitting, the incorporation of other metal elements to the host electrocatalyst is required, especially for previously reported highly efficient MoO2–MoNi4 (MoNi in short). Herein, to lessen the energy cost in full water splitting, the vanadium-incorporated MoO2–MoNi4 (VMoNi in short) hybrid nanoarray self-supported on nickel foam is prepared through a simple way. Compared with the Mo–Ni binary electrocatalyst, vanadium incorporation can obviously boost oxygen evolution reaction (OER) activity while almost keeping the perfect hydrogen evolution reaction (HER) ability, for it merely requires 202 and 17 mV for 10 mA cm–2 working current density toward OER and HER, respectively. Furthermore, it displays outstanding performance toward full water splitting, merely requiring 1.45 V for 10 mA cm–2 and 1.61 V for 100 mA cm–2 in water electrolysis with keeping the voltage stable in tens of hours at 250 mA cm–2. This work highlights the significance in large-scale hydrogen production from water electrolysis with the help of exploring non-noble materials, an important milestone in converting the renewable energy to hydrogen energy.
研究领域:
材料科学
·
能源转换
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Wanzhe Tong,Yi An,Chongxi Bao,Dong Fang,Mingjun Wang,Jianhong Yi
The strengthening effect of particle-reinforced copper-based composites mainly depends on the interfacial bonding strength and dispersibility of the reinforcement. However, agglomeration of nanoparticles , as a bottleneck, restricts Orowan's strengthening mechanism. Different from the traditional preparation method for stacked nanoparticles, a hydrothermal method was developed to prepare interconnected bridge-like MoO 2 quantum dots . Based on the interconnected structure and the brittleness of MoO 2 , it can be easily broken and uniformly dispersed into copper matrix during the ball milling process. Due to the dispersion strengthening effect and coherence of the interface between MoO 2 and copper, these factors improve the mechanical performance of the composite material synergistically, resulting in simultaneous increases in YS (145.76 MPa), UTS (321.67 MPa), and hardness (94.79 Hv). The effectiveness of YS and UTS enhancement is 234% and 41%, respectively, while maintaining appropriate elongation (20.29%) and conductivity (94.9 IACS). MoO 2 quantum dots are used for the first time in this work as particle reinforcements , and we demonstrate that the addition of oxide quantum dots to metal matrix composites can significantly enhance the mechanical properties of the composites by changing the morphology of the quantum dots.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Liu Shujie,Zhang Zhiguo,Dastafkan Kamran,Shen Yan,Zhao Chuan,Wang Mingkui
Active and stable electrocatalysts are essential for hydrogen production from alkaline water electrolysis. However, precisely controlling the interaction between electrocatalysts and reaction intermediates (H 2 O*, H*, and *OH) remains challenging. Here, we demonstrate an yttrium-doped NiMo-MoO 2 heterogenous electrocatalyst that efficiently promotes water dissociation and accelerates the intermediate adsorption/desorption dynamics in alkaline electrolytes. Introducing yttrium into the NiMo/MoO 2 heterostructure induces lattice expansion and optimizes the d -band center of NiMo alloy component, enhancing water dissociation and H* desorption. Yttrium doping also increases the concentration of oxygen vacancies in MoO 2−x , which in turn accelerates the charge kinetics and the swift evacuation of *OH intermediates from the active sites. Consequently, the Y-NiMo/MoO 2−x heterostructure exhibits notable performance by requiring only 189 and 220 mV overpotentials to achieve current density of 2.0 A cm −2 in alkaline water and seawater, respectively. This work provides a strategy to modulate heterostructure catalysts for scalable, economically viable hydrogen production from low-quality waters.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Rongcai Jia,Liang Guo,Wei Yang,Dezhao Wang,Zhengzhe Li
Hydrogen sulfide (H 2 S) is a highly toxic gas commonly encountered in industrial settings, posing substantial health risks to workers. Therefore, the development of sensors with optimized operating temperatures, rapid detection speeds, and broad measurement ranges is of paramount engineering significance. In this study, ZnFe 2 O 4 /MoO 2 nanocomposites were synthesized using a hydrothermal method, and, for the first time, MEMS-based gas sensors utilizing ZnFe 2 O 4 /MoO 2 nanocomposite films were employed for hydrogen sulfide detection. The structural composition and morphology of the ZnFe 2 O 4 /MoO 2 (2:1) samples were characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The gas sensitivity of ZnFe 2 O 4 /MoO 2 toward H₂S was systematically investigated. Gas sensitivity tests demonstrated that the ZnFe 2 O 4 /MoO 2 composite sensor exhibited a response value of 19.177 at 5 ppm hydrogen sulfide, which is 5.2 times greater than that of ZnFe 2 O 4 , the current dominant material for H₂S detection. Furthermore, the ZnFe 2 O 4 /MoO 2 composite sensor demonstrated a detection limit as low as 1 ppm and exhibited significantly faster response and recovery times (13 s and 11 s, respectively, for 5 ppm H₂S). The ZnFe 2 O 4 /MoO 2 (2:1) nanocomposite sensor exhibited excellent stability, sensitivity, and remarkable selectivity. This enhanced gas-sensing performance is attributed to the formation of n-n heterojunctions between ZnFe 2 O 4 and MoO 2 , as well as the optimized nanomorphology of the composite. Therefore, the ZnFe 2 O 4 /MoO 2 sensor presents a promising solution for hydrogen sulfide detection in industrial applications.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2024
·Vol. 18
·期 4
·2300346
·
IF 2.5
Dingbang Yang,Xiao Guo,Junjie Jiang,Yongsong Wang,Yuedong Wang,Jindong Bai,Haipeng Xie,Jin Li,Fangping Ouyang,Han Huang
Interfacial interactions, including interfacial charge transfer and strain, play important roles in the applications of 2D layered materials. Recently, MoO 2 have been widely used as precursors or substrates for growth of high-quality MoS 2 . Herein, photoluminescence (PL) and Raman spectroscopy are used to investigate the dependence of epitaxial monolayer MoS 2 PL properties on MoO 2 nanoflakes in different thicknesses on c-sapphire. On all MoO 2 nanoflakes, the trion exciton of MoS 2 disappears due to the interfacial charge transfer from MoS 2 to MoO 2 . The neutral exciton of MoS 2 exhibits a ≈60 meV redshift on thick MoO 2 nanoflakes compared to those either on c-sapphire or on thin MoO 2 nanoflakes, which is attributed to the relaxation of c-sapphire-induced compressive strain in MoO 2 over a critical thickness. Temperature-dependent PL measurements reveal a stronger electron–phonon interaction in MoS 2 on MoO 2 than on c-sapphire. The findings provide an easy way to tune the properties of MoS 2 via tuning the thickness of MoO 2 buffer layer on c-sapphire.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Applied Materials Today
·
2019
·
IF 8.013
Chao Fang,Peijian Yan,Zhaohui Ren,Yifan Wang,Xiujun Cai,Xiang Li,Gaorong Han
A variety of approaches have been investigated in the development of photothermal (PTT) and photodynamic (PDT) therapies for cancer treatment. However, when used in isolation, both PTT and PDT suffer from intrinsic drawbacks, resulting in unsatisfactory therapeutic efficacy. We describe here, a multifunctional nanoplatform, enabling the effective combination of PTT and PDT, triggered by a single 808nm-NIR light. This platform is based on MoO 2 nanoparticles, which can effectively transform NIR light into heat. By attaching molecules of indocyanine green (ICG), a hydrophilic and biocompatible NIR-mediated photosensitizer, to the surface of the particles, both photothermal and photodynamic effects can be achieved. Using an in vitro study with 4T1 cancer cells, we have demonstrated that irradiating the particles with 808nm NIR can trigger ROS production and create heat within cells. Both mechanisms acting synchronously are likely to result in superior in vivo efficacy in tumor phototherapy.
研究领域:
肿瘤学
·
纳米医学
·
生物材料学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Haochun Chen,Yin Wang,Shuxing Zhou,Nianpeng Li,Xijun Liu,Abdukader Abdukayum,Lei Zhang,Guangzhi Hu
The development of water-separation-performing, noble-metal-free, and cost-effective electrocatalysts is of the utmost importance. This work outlines the preparation of ordered, macroporous MoS 2 –Fe 2 Mo 3 O 8 /MoO 2 electrocatalysts with heterogeneous structures using pyrolysis and sulfidation methods. The resulting macroporous and heterogeneous structures feature more active sites and facilitate ion diffusion, thereby effectively improving the overall performance. The catalyst demonstrated excellent performance in both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) in a 1 M potassium hydroxide solution, requiring overpotentials of 213 and 60 mV, respectively, to achieve a current density of 10 mA cm −2 . Moreover, the MoS 2 –Fe 2 Mo 3 O 8 /MoO 2 -based electrolyzer only requires an output voltage of 1.49 V, exhibiting superior performance and long-term stability compared to commercial catalysts. This study introduces a novel approach for achieving a heterogeneous macroporous structure that can enhance electrocatalysis .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）