AIP Advances
·
2023
·Vol. 13
·期 5
·
IF 1.6
Zhang Lan,Yu Shiyao,Ma Huizhong,Zhu Mingcheng,Zhang Jidong
The fabrication of ZrC–Mo composites with (10–25 vol. %) Mo content using a spark plasma sintering at 1750 °C under 35 MPa was investigated in this research. The effects of adding various Mo contents on the composites were also examined. The microstructure and phase analysis were investigated by scanning electron microscopy, x-ray diffractometer, and energy dispersive spectroscopy. Microscopic analysis revealed that the addition of metal Mo resulted in making the ceramic particles of ZrC finer, the sintered products denser, and the sintering conditions softer. Moreover, a continuous solid solution forms in the composite as the Mo content rises, the (Zr, Mo)C and (Zr, Mo) 2 C start to generate, and thus solid solution strengthens the material. The addition of metal Mo reduced the grain size of the ceramic composite and also lead to fine-grain strengthening. With a relative density of 97.53%, a Vickers hardness of 23.88 GPa, and a flexural strength of 317.55 MPa, the composite possessed the best properties when the molybdenum volume fraction reaches 15 vol. %. The synergistic effect of fine grain strengthening and solid solution strengthening improved the mechanical behavior of the composite.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yijie Wang,Xudong Wu,Dan Chen,Linqian Hou,Dezhi Yang,Hong Li,Yaling Yang
The rapid and sensitive detection of glyphosate herbicide in agricultural products is urgent need. Herein, we develop a photosensitive Fe 3 O v -Mo/P nanozyme with defect-rich rough surface by the co-precipitation method. In particular, the Fe 3 O v -Mo/P nanozyme with high-percentage oxygen vacancy (OV) defects and rough surface exhibited superior peroxidase (POD)-like activity and kinetics. More intriguingly, Fe 3 O v -Mo/P nanozyme with strong optical absorption in near-infrared (NIR) region showed excellent light-promoted POD-like activity. It was found that the defect-rich rough surface is conducive to the adsorption of glyphosate to inhibit the POD-like activity of Fe 3 O v -Mo/P. Under near-infrared laser irradiation, the inhibitory effect of glyphosate on the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by Fe 3 O v -Mo/P was increased by 2.64 times. A colorimetric platform was developed for the detection of glyphosate with a low detection limit of 0.032 mg L -1 and good selectivity. The method was used to determine the residual glyphosate in coffee, and the recovery efficiency was between 91.20–104.00 %. This work that combines the advantage of defect engineering and NIR provides a strategy for developing high-active nanozyme in pesticide assay.
研究领域:
分析化学
·
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bo Yu,Fanming Meng,Muhammad Wasim Khan,Rui Qin,Xingbin Liu
Traditional bulk photocatalysts often experience serious charge recombination and poor visible-light capturing, resulting in inefficient photocatalytic activity. However, proper nanostructure design usually helps to increase the activity of composite photocatalysts. Here, hollow TiO 2 @g-C 3 N 4 /Co 3 O 4 core-shell microspheres are first reported. The hollow structure of the heterostructured will directionally separate the photogenerated carriers, and the photogenerated holes transferred to the surface will be further captured by Co 3 O 4 to achieve an exposed oxidized surface. The novel multi-stage hollow microspheres can simultaneously achieve effective transfer of photogenerated carriers and extended light absorption. Benefiting from these structural and compositional characteristics, the optimized TiO 2 @g-C 3 N 4 /Co 3 O 4 nanospheres have excellent photodegradation activity for tetracycline and MO. Under simulated sunlight, the degradation rates of TC (10 mg/L) and MO (25 mg/L) at 60 min are 91.6% and 97.8%, respectively. At the same time, high activity is maintained after multiple cycles of testing. Possible transfer paths for photogenerated carriers have also been proposed. This work will provide more inspiration for the design of multi-stage hollow photocatalytic systems.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Peishu Yang,Yong Liu,Kaigui Zhu
The selection of elements, tune of compounds types and modification of structure are important ways to improve OER activity of high-entropy alloys. The reconstruction behavior of film electrodes during OER process revealed that Mo element has a strong promoting effect on the reconstruction of FeCoNi-based films. It is shown by first-principles that electron-deficient region could be formed near Mo, and electron-rich region could be formed near surrounding elements of Mo. Charge transfer may be the reason that Mo promotes reconstruction of high-entropy alloys. Compared with FeCoNiCr film electrode, FeCoNiCrMo film electrode, the 2p 3/2 binding energy peaks of Fe/Co/Ni in which are shifted forward, has more oxygen-containing species and oxygen vacancies. The study also revealed the existence of lattice oxygen mechanism during OER process. The deposition thickness of alloy film has a linear relationship with sputtering time and deposition rate of FeCoNiCrMo. There is an optimal deposition thickness of FeCoNiCrMo film electrode for OER. FeCoNiCrMo film electrodes have the most excellent OER performance: the overpotential is 268 mV, and the Tafel slope is 57.6 mVdec −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Zehui Liu,Jinzhao Huang,Feng Jiao,Ke Zhang,Guixin Zhao,Xiaolong Deng
Electrochemical water splitting is considered to be an environmentally friendly and efficient method of hydrogen production. NiFe LDH is a well-known electrocatalyst for oxygen evolution, yet its effectiveness in HER has been suboptimal. In this research, we created a Mo-NiFe LDH@NiS catalyst on carbon cloth via cation doping and heterointerface construction of NiFe LDH. The resulting Mo-NiFe LDH@NiS/CC showed remarkable HER activity. Furthermore, when used as a bifunctional electrode for overall water splitting, Mo-NiFe LDH@NiS/CC operated at a cell voltage of 1.58 V at a current density of 10 mA/cm² and exhibited outstanding durability. This study emphasizes the significant enhancement in HER and overall water-splitting efficiency of NiFe LDH achieved through Mo doping and heterostructure engineering, advancing its potential for effective water splitting applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2020
·Vol. 72
·期 3
·1279-1285
·
IF 2.054
Xia Yang,Zhao Jinlong,Dong Zhaowang,Guo Xueyi,Tian Qinghua,Liu Yong
Cobalt-chrome-molybdenum (Co-Cr-Mo) alloy possesses outstanding strength, wear, and corrosion resistance and is a good material candidate for making dental and orthopedic implants. Spherical Co-Cr-Mo powder for additive manufacturing is usually costly due to the high-temperature melting processes and low yield of the powder with desirable particle size in the conventional melt-atomization process. A novel process for making spherical Co-Cr-Mo alloy powder through a simple meltless granulation and sintering process is described herein. The results indicate that the compositional segregation problem can be overcome and high-temperature operation avoided. Segregation-free powder was obtained after sintering above 1200°C. The powder was purified during sintering in a hydrogen atmosphere. The hydrogen purification mechanism is discussed with the aid of thermodynamic modeling using HSC Chemistry software. The oxygen content in the final powder can be controlled to < 0.2 wt.% for powder with particle size < 107 µ m. The final powder retained good spherical morphology.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Meng Liu,Xiangzhe Yan,Lezhu Su,Hang Dong,Zhan Hu,Yuanqi Peng,Liqian Guan,Junjie Zhang,Zhi Zhou,Yongfa Zhu,Nan Zhou
Pyrolysis technology has been focused on waste plastics for recycling. However, there is rare research for reusing pyrolysis products (carbon nanotubes). Based on pyrolysis technology of waste polypropylene (PP) plastic, carbon nanotube coated Fe–Mo/MgO nanomaterial (CNT@Fe–Mo/MgO) was prepared by chemical vapor deposition to remove Gram-pathogenic bacteria. The addition of Mo and MgO promoted the cracking of PP plastic and the formation of MWCNTs. The as-obtained CNT@Fe–Mo/MgO can stimulate H 2 O/O 2 to produce abundant ·OH, ·O 2 − and 1 O 2 radicals, which probably resulting from the synergistic effect of delocalization of CNTs and REDOX pair of Fe 3 O 4 . Consequently, the removal rate of Escherichia coli and Staphylococcus aureus by CNT@Fe–Mo/MgO composite catalyst can reach 100% within 2h, without the help of any additional energy or active oxidant. At the same time, the material is remarkable stability and reusability with complete removal of pathogens after six cycles. This study not only provides a method for the synthesis of highly effective sterilizers , but also opens up a new direction for the application of functional carbon nanocomposites prepared by pyrolysis of waste plastics.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Weiwen Wang,Jianing Qu,Chaojie Li,Lexin Guo,Xianxin Fang,Guanghui Chen,Jihai Duan
Biomimetic photocatalytic nitrogen fixation is considered as a potential alternative to the Haber-Bosch method, which is an ideal pathway for nitrogen reduction. The development of efficient bionanocatalysts is a serious challenge in the current field of biomimetic nitrogen fixation. Here, we introduced a second metal in the MIL-88A/Fe mesh by metal doping to build a Mo-doped MIL-88A(Fe/Mo)/Fe mesh biomimetic system. The catalyst is a rod-like structure synthesized in situ by hydrothermal method using iron mesh as the substrate, and its rough surface is favorable for the adsorption of N 2 . The introduction of Mo provides a two-electron transfer pathway for the reaction, and the formation of the "MoFe cofactor" effectively promotes charge separation and inhibits the photoelectron-hole complexation. In addition, we kept the catalyst above the liquid surface and provided the proton source through water vapor, which solved the problem of the low solubility of N 2 in water and poor mass transfer efficiency. The results show that the biomimetic photocatalyst has good photoresponsiveness in the whole visible region, and the synergistic effect between the two metals makes the MIL-88A (Fe/Mo 0.017 )/Fe mesh exhibit better photocatalytic performance, and its nitrogen fixation efficiency reaches about 9.6 times that of the original MIL-88A/Fe mesh. This study provides a new idea for the design of photocatalytic ammonia biomimetic photocatalysts.
研究领域:
材料科学
·
环境科学
·
生物化学
✓ 已验证
DOI
高影响因子
Materials Reports: Energy
·
2023
·
IF 0
Xiu-Qing Qiao,Wenxuan Chen,Chen Li,Zizhao Wang,Dongfang Hou,Bojing Sun,Dong-Sheng Li
Photocatalytic water splitting on noble metal-free photocatalysts for H 2 generation is a promising but challenging approach to realize solar-to-chemical energy conversion. In this study, Mo/Mo 2 C nanoparticles anchored carbon layer (Mo/Mo 2 C@C) was obtained by a one-step in-situ phase transition approach and developed for the first time as a photothermal cocatalyst to enhance the activity of ZnIn 2 S 4 photocatalyst. Mo/Mo 2 C@C nanosheet exhibits strong absorption in the full spectrum region and excellent photo-thermal conversion ability, which generates heat to improve the reaction temperature and accelerate the reaction kinetics. Moreover, metallic Mo/Mo 2 C@C couples with ZnIn 2 S 4 to form ZnIn 2 S 4 –Mo/Mo 2 C@C Schottky junction (denoted as ZMM), which prevents the electrons back transfer and restrains the charge recombination. In addition, conductive carbon with strong interfacial interaction serves as a fast charge transport bridge. Consequently, the optimized ZMM-0.2 junction exhibits an H 2 evolution rate of 1031.07 μmol g −1 h −1 , which is 41 and 4.3 times higher than bare ZnIn 2 S 4 and ZnIn 2 S 4 –Mo 2 C, respectively. By designing novel photothermal cocatalysts, our work will provide a new guidance for designing efficient photocatalysts.
研究领域:
材料科学
·
能源化学
·
纳米技术
✓ 已验证
DOI
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Wangqiong Xu,Beituo Liu,Shubiao Xia,Lijuan Chen,Ruijuan Qi,Qiling Li,Shimei Guo,Feixiang Cheng,Rong Huang,Zhe Li
Mo doping plays a striking role in the stability enhancement of LiMn 2 O 4 cathode materials. However, the underlying microscopic mechanism is still unclear. Here, we elucidate that the relationship between the atomic position of Mo doping in LiMn 2 O 4 and the stability enhancement of Mo-doped LiMn 2 O 4 by utilizing the spherical aberration-corrected scanning transmission electron microscopy (Cs-STEM). It exhibits that the part of Mo 6+ ions occupy empty Mn 16c site to form a surface reconstructed layer of rock-salt like phase on the outermost surface and other Mo 6+ ions dope into the Mn octahedral 16d sites to form LiMo x Mn 2-x O 4 in bulk, which is beneficial for inhibiting the parasitic side reactions. Concomitantly, this dual modification of bulk structure and surface can significantly enhance electrode reversibility and Li + diffusion. As a result, excellent long cycling stability of the as-designed optimal LiMo 0.01 Mn 1.99 O 4 after 1500 cycles with 61.61 % capacity retention at 10 C (1 C = 148 mAh g −1 ) is presented, with an initial discharge capacity of 88.30 mAh g −1 . Our research provides a clever approach for regulating the surface structure/bulk architecture in LiMn 2 O 4 cathode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Huang Meng,Huang Wenbin,Li Anqi,Yang Han,Jia Yijing,Yu Zhiqing,Xu Zhusong,Wang Xiaohan,Zhou Yasong,Wei Qiang
Experiments were carried out to research the different contents of Ga2O3 modification effects on the hydrodesulfurization (HDS) performance of 4,6-dimethyldibenzothiophene (4,6-DMDBT) catalyzed by the stepwise impregnation method. Characterization techniques such as XRD, BET, HRTEM, NH3-TPD, and Py-FTIR were performed to determine the effects of each modification of the catalyst by Ga on the properties of the prepared supports and catalysts. The catalytic effect of gallium is reflected in the fact that the empty d-orbitals of Ga elements participate in the formation of molecular orbitals in the active center and change their orbital properties, thus generating a direct desulfurization active phase suitable for complex sulfides for endpoint adsorption. The characterization results indicated that the introduction of Ga2O3 with appropriate content (2 wt.%) promoted Ni and Mo species to disperse uniformly and doping of more Ni atoms into the MoS2 crystals, which also increased the average stacking number and the length of MoS2. As a result, more NiMoS active phases were favored to form in the system. The specific surface area and the amounts of acid sites were increased, facilitating the adsorption of reactant molecules and the HDS reactions. The HDS results also suggested the effects of Ga modification play a very important role in the catalytic performance of the corresponding catalysts. The catalyst Ga–Ni–Mo/Al2O3 exhibited the highest conversion rate towards 4,6-DMDBT HDS when the amount of Ga2O3 loading was 2 wt.% with an LHSV of 2.5 h−1 at 290°C and Ga modification also can effectively improve the direct desulfurization (DDS) route selectivity in varying degrees.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
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.
研究领域:
材料科学
·
航空航天工程
✓ 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）