Journal of Energy Chemistry
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2022
·
IF 13.599
Xin Wu,Xingyu Xiong,Bin Yuan,Jun Liu,Renzong Hu
A good cycling stability is a prerequisite for the application of metal-based materials in lithium-ion batteries (LIBs). However, an abnormal increase in capacity is often observed, which has rarely been focused on in many studies. In our SnSe-Mo-C composite anode, a high reversible capacity of 737.4 mAh g −1 remained after 5000 cycles at 5 A g −1 between 0.01 and 3.0 V versus Li/Li + . However, a continuous capacity increase occurred in the initial cycles, with 1086.9 mAh g −1 after 1000 cycles and 1216.9 mAh g −1 after 1500 cycles, respectively. Further studies revealed that the electrolyte decomposed at high potentials (2.5–3.0 V) and provided additional capacities. The cut-off voltage and electrolyte filling were controlled, which eliminated the impact of electrolyte decomposition, prevented rapid capacity decay, and provided a stable cycling performance for SnSe-Mo-C anodes in LIBs. This work shows that the composite anode is promising for lithium storage and the findings provide new insights into understanding and controlling the phenomenon of capacity increase with cycling in metal-based anode materials.
研究领域:
材料科学
·
电化学
·
能源存储
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纳米材料
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电池技术
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiao-Hui Yang,Guo-Hua Zhang
In this study, ultrafine borides powders including (W,Mo)B, (W,Mo)B 2.5 and (Mo,W)AlB were successfully fabricated via boronizing ultrafine W-Mo solid solution composite powder with B 4 C as the boron source under the assistance of Ca melt or Al melt. Ultrafine W-Mo solid solution powder was obtained by using a two-stage reduction route to reduce the precursor powder synthesized by spray drying. Meanwhile, the effects of Mo/W ratio on the phase composition, morphological characteristics and particle size distribution of boride solid solution composite powder were thoroughly investigated. The shift of diffraction peak in the XRD spectrum, the linear change of lattice constant and the homogeneous distributions of W, Mo, B and Al in the EDS energy spectrum comprehensively confirmed that the boride solid solution with different Mo/W ratios could be prepared. Due to the essentially insolubilities of W and Mo in Ca melt, the (W, Mo)B grains grew following a template growth mechanism, and inherited the nearly spherical morphology feature of ultrafine W-Mo solid solution composite powder with a particle size of approximately 200 nm. Nonetheless, as a result of the high solubilities of W, Mo, and B in Al melt, the process of dissolution-precipitation led to the formations of flaky (W, Mo)B 2.5 and short rod-shaped (Mo, W)AlB.
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Journal of Materials Research and Technology-JMR&T
·
2019
·
IF 3.327
Guo-Dong Sun,Guo-Hua Zhang,Kuo-Chih Chou
A simple and efficient pathway was developed to synthesize ultrafine grained oxide dispersion strengthened (ODS) Mo alloys doped with nano-scaled oxide particles. Firstly, dispersed La(NO 3 ) 3 or Al(NO 3 ) 3 nanoparticles were introduced into commercial MoO 3 via a solution spraying method. Then, Mo nanopowders containing different amounts of oxides nanoparticles (La 2 O 3 (0%, 0.5%, 1% and 2%) or Al 2 O 3 (0.5%, 1%)) were successfully prepared by reducing the doped MoO 3 with carbon black at 600 °C and 1050 °C, and hydrogen at 800 °C. Due to the high sintering activity of prepared doped Mo nanopowder, after sintering in H 2 at 1300 °C for 3 h, the relative density of sintered products containing 0.5% La 2 O 3 or Al 2 O 3 reached to above 95.4%. Nanostructured ODS Mo alloys with Mo and La 2 O 3 (or Al 2 O 3 ) grain sizes of about 0.5 μm and 75 nm (or 50 nm for Al 2 O 3 ) were successfully prepared at around 1300 °C. The obtained nanostructured Mo-oxides alloys had much high hardness values. For the Mo-La 2 O 3 alloys, the highest value of hardness can reach to 338 HV (1% La 2 O 3 , Mo grain size, 0.51 μm; La 2 O 3 grain size, 71.3 nm; density, 93.0%), while the highest hardness of Mo-Al 2 O 3 alloys reached to 385 HV (1% Al 2 O 3 , Mo grain size, 0.55 μm; Al 2 O 3 grain size, 55.9 nm; density, 94.6%), which were much higher than the ODS-Mo alloys prepared from the traditional methods. This method could also have great potential for industrially producing nanostructured ODS Mo alloys and W alloys.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2022
·
IF 6.044
Mingyong Jia,Fei Chen,Yueqi Wu,Like Xu,Qiang Shen,Nan Jiang,Jian Sun
The metallization of AlN ceramic is a critical prerequisite for applying AlN ceramics to electronic component packaging. In this study, a concept of functionally graded materials (FGMs) was used for the metallization of AlN ceramic. Symmetrical Mo/AlN/Mo FGMs with different composition exponent p ( p =1, p <1, and p >1) were designed and fabricated by hot-press sintering. The influence of the p -value on the shear performance and fracture path of the Mo/AlN/Mo FGMs was investigated. Compared to specimens with p =1, the specimens with p <1 and p >1 show the distribution of Mo-rich and AlN-rich in the graded transition layer, respectively. The shear strength of the specimens reaches a maximum value of 48.0 MPa as p < 1 and 22.5 MPa higher than the minimum value as p > 1. Besides, three fracture paths were found for the Mo/AlN/Mo FGMs with different values of p , including the cracks propagate obliquely along the axis in the graded transition layer, the cracks penetrate through the AlN ceramic and the graded transition layer, and the cracks only propagate horizontally in a single graded layer. The crack initiation of Mo/AlN/Mo FGMs depends on the strength of each graded layer. Moreover, the directions of fracture paths are closely related to the strength of the ceramic interlayer and the composition exponent p .
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Journal of Energy Storage
·
2023
·
IF 9.4
Yifei Li,Zhongzhu Qiu,Meng Qu,Yuedi Wang,Haodong Wang,Junjie Jiang
Supercapacitors have the advantages of high power density, rapid charge and discharge rates, and extended cycling stability. However, their energy density and specific capacity are still inadequate to satisfy the current requirements for energy storage in the industry. The current work demonstrates the synthesis of Mo-ZIF-67/CNT composites through mechanical stirring and co-precipitation. After that, Ni, Co and Mo trimetallic sulfide/CNT composites (Ni-Co-Mo-S/CNT) are produced through further ion exchange/etching and vulcanization processes . The material has multiple valence states of three different metal ions, providing a large number of oxidation-reduction sites. The doping of CNT endows it with a unique coral-like structure, which helps to form its huge specific surface area and larger mesopores. Furthermore, the effect of vulcanization temperature on the electrochemical performance of the material is also studied. According to the results, the Ni-Co-Mo-S/CNT-180, which is vulcanized at 180 °C, exhibits the most outstanding electrochemical performance. The electrode exhibits impressive performance with a specific capacitance of 1728.6 F/g at a current density of 1 A/g. It also has good rate capability, maintaining 55.8 % of the specific capacitance when the current density increases tenfold. Finally, the prepared Ni-Co-Mo-S/CNT-180//AC asymmetric supercapacitor generated a high energy density of 43 Wh/kg at a power density of 735 W/kg. After 2000 charge-discharge cycles at a current density of 1 A/g, it maintains a capacity of 76.42 %. This study serves as a reference for researching multi-metal sulfides as electrode materials for high-performance supercapacitors.
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高影响因子
JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Jiajia Cai,Yongjun Li,Zhi Zhang,Aobo Cui,Zhengxin Cai,Qian Xie,Jianmin Wang
The low sustainable current density in darkness restricts the advancement of photocathodic protection (PCP) for steels in marine environments. A combination of MoO 3 /WO 3 (Mo/WO 3 ) was proposed as an electron storage system to enhance capacitance and charge/discharge rates. Subsequently, incorporating ZnIn 2 S 4 (ZIS) extended light harvesting and improved photocarrier separation efficiency, resulting in efficient round-the-clock PCP performance. Under illumination, the open circuit potential (OCP) of 10Mo/WO 3 @ZIS coupled with 304SS reaches −0.97 V vs. Ag/AgCl, approximately 600 mV and 140 mV more negative than corrosion potential (E corr ) of 304SS and WO 3 @ZIS coupled 304SS, whth photocurrent density of 134 μA/cm 2 . The excellent PCP performance is attributed to superior photocarrier separation and enhanced light-harvesting capability. Notably, in the dark, the OCP of the coupled system remains ca . 0.4 V below the E corr of 304SS, with an average current density of 30 μA/cm 2 , demonstrating the regulated electron storage capabilities of Mo/WO 3 . Furthermore, capacity and charge/discharge rates correlate with Mo/W ratio and electrolyte species. 10Mo/WO 3 @ZIS exhibits a charge capacity of 2.93 mC, nearly 3 times higher than that of WO 3 @ZIS. The innovative application of MoO 3 and WO 3 proves the potential to regulate the electron storage performance, revealing the factors for photoelectron storage/release.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2021
·
IF 5.234
Weiqiang Hu,Lei Wang,Zongqing Ma,Liming Yu,Yongchang Liu
This work proposed an innovative technology to fabricate Mo–La–O nanoparticles strengthened Mo alloys with ultrafine nano grains via freeze-drying and low temperature sintering . These novel nano Mo–La–O particles including La 7 Mo 7 O 30 , La 5 Mo 3 O 16 , La 6 Mo 2 O 15 , La 5 Mo 4 O 12 , La 4 Mo 2 O 11 and La 2 (MoO 6 ) remain coherent or semi-coherent interfaces with Mo matrix to strengthen their phase boundaries. Moreover, nano Mo–La–O particles enriched in excess oxygen absorb nearby impurity oxygen and then lead to the purification of Mo matrix. Furthermore, the low temperature sintered Mo–La x Mo y O z alloys possess high relative density (98.1%), which is due to the high sintering activities of ultrafine powders (56 nm). Comparing with available literature which involves oxide-dispersion-strengthened-molybdenum alloys (ODS-Mo), the freeze-dried Mo–La x Mo y O z alloys in our work possess the finest grain size (440 nm), the finest oxide particle size (mainly <5 nm), the highest hardness (495 HV 0.2 ) and high strength (1201 MPa) at 30% deformation.
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高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 83
·期 2
·435-448
·
IF 1.638
Wu Lang,Luo Zhengwei,Jiang Hui,Zhao Zijian,Geng Wenhua
Fe 3 O 4 nanoparticles-based magnetic Mo(VI) surface ion-imprinted polymer (Mo(VI)-MIIP) was elaborated employing 4-vinyl pyridine as a functional monomer. The adsorbent preparation was confirmed by Fourier-transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectrometry, X-ray diffraction, vibrating sample magnetometer, thermogravimetric analysis, and surface area analysis. Batch adsorption experiments showed that the maximum adsorption capacity of Mo(VI)-MIIP was 296.40 mg g −1 at pH 3, while that of the magnetic non-imprinted polymer (MNIP) was only 147.10 mg g −1 . The adsorption isotherm model was well fitted by the Langmuir isotherm model. The adsorption experiments revealed that Mo(VI)-MIIP reached adsorption equilibrium within 30 min, and the kinetics data fitting showed that the pseudo-second-order kinetics model suitably described the adsorption process. Mo(VI)-MIIP exhibited an excellent adsorption selectivity to Mo(VI) in binary mixtures of Mo(VI)/Cr(VI), Mo(VI)/Cu(II), Mo(VI)/ , Mo(VI)/Zn(II), and Mo(VI)/I – , with relative selectivity coefficients toward MNIP of 13.71, 30.27, 20.01, 23.53, and 15.89, respectively. After six consecutive adsorption-desorption cycles, the adsorption capacity of Mo(VI)-MIIP decreased by 9.5% (from 228.4 mg g −1 to 206.7 mg g −1 at initial Mo(VI) concentration of 250 mg L −1 ), demonstrating its reusability. Magnetic surface ion-imprinted polymer was synthesized for rapid and selective removal Mo(VI) from aqueous solution. The effects of pH value, contact time and initial concentration on the adsorption process were investigated. Mo(VI) adsorption followed the pseudo-second-order kinetics and Langmuir isotherm model. Magnetic surface ion-imprinted polymer showed high selectivity for Mo(VI) in the presence of competitive ions.
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Catalysts
·
2022
·Vol. 12
·期 5
·493
·
IF 4.501
Gengzhe Song,Qi Wang,Liang Yang,Duohua Liao,Shuang Li
A series of the layered double oxides supported molybdenum oxide catalysts were synthesized and evaluated in the oxidative dehydrogenation of ethane with CO2(CO2-ODHE). The 22.3 wt% Mo/LDO catalyst delivered a 92.3%selectivity to ethylene and a 7.9% ethane conversion at relatively low temperatures. The molybdenum oxide catalysts were fully characterized by XRD, BET, SEM, TEM, UV–vis, Raman TG, and XPS. Isolated [MoO4]2−dominated on the surface of the fresh 12.5 wt% Mo/LDO catalyst. With the increase of the Mo content, the Mo species transformed from [MoO4]2−to [Mo7O24]6−and [Mo8O26]4−on the 22.3 wt% and 30.1 wt% Mo/LDO catalysts, respectively. The redox mechanism was proposed and three Mo species including [MoO4]2−, [Mo7O24]6−, and [Mo8O26]4−showed quite different functions in the CO2-ODHE reaction: [MoO4]2−, with tetrahedral structure, preferred the non-selective pathway; [Mo7O24]6−, with an octahedral construction, promoted the selective pathway; and the existence of [Mo8O26]4−reduced the ability to activate ethane. This work provides detailed insights to further understand the relationship between structure–activity and the role of surface Mo species as well as their aggregation state in CO2-ODHE.Keywords:ethane;oxidative dehydrogenation;molybdenum oxide;CO2;Mo/LDO catalyst
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Catalysts
·
2026
·Vol. 16
·期 6
·503
·
IF 4.5
Yudong Meng,Xing Fan,Zehui Yu,Jianyu Cai
In this study, Pt/N-Mo/TiO2and Pt/Mo/TiO2catalysts were prepared by the two-step impregnation method for catalytic CO oxidation, with the obtained Mo/TiO2pretreated or not with NH3before Pt loading. The Pt/N-1Mo/TiO2catalyst exhibited superior catalytic activity compared to Pt/1Mo/TiO2and Pt/N-xMo/TiO2(x= 0, 0.5, 2, 3, 5), indicating the essential role of N-modification of Mo/TiO2with an optimal MoO3loading. TheT90decreased from 133 °C for Pt/1Mo/TiO2to 105 °C for Pt/N-1Mo/TiO2under a feed gas consisting of 8000 ppm CO, 16% O2, 3% H2O and balanced N2. For both Pt/1Mo/TiO2and Pt/N-1Mo/TiO2catalysts, the H2O in the feed gas showed promotive effects on CO oxidation, while SO2caused some deactivation at low temperatures. Under the same feed gas composition (8000 ppm CO, 16% O2, 10% H2O, 50 ppm SO2and balanced N2) and temperature (185 °C), Pt/N-1Mo/TiO2demonstrated superior SO2resistance compared to Pt/1Mo/TiO2. CO conversion on Pt/N-1Mo/TiO2remained above 99% during a 12-h SO2resistance test, while that on Pt/1Mo/TiO2gradually decreased to 26%. Characterization results show that NH3pretreatment of 1Mo/TiO2significantly improved the dispersion of Pt and enhanced the dissociation of adsorbed H2O into highly reactive hydroxyl (*OH) species, partially explaining the better activity of Pt/N-1Mo/TiO2compared with Pt/1Mo/TiO2. H2O might promote CO oxidation by facilitating the formation of easily decomposable bicarbonate and formate intermediates. SO2impeded the Pt reduction process on Pt/1Mo/TiO2while it hardly affected that on Pt/N-1Mo/TiO2, explaining their difference in SO2resistance.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chenyang Xu,Baosong Li,Zhengwei Liu,Ziwei Yuan,Zhen Zhang,Shengquan Chen
Nanocrystalline Ni–Mo and Ni–Mo–ZrO 2 coatings were designed and successfully fabricated via electrodeposition process in direct current mode. Impacts of molybdate and ZrO 2 nanoparticles , cathodic current density ( i c ) on surface, structure and performance of Ni–Mo alloy were analyzed. Electrochemical behaviors were evaluated by electrochemical impedance method in sodium chloride solution. A more compact and consistent surface morphology was prepared by introducing molybdate in nickel. Grain sizes of Ni–Mo alloy decreased as molybdate increased from 2 to 6 g L −1 , and enlarged as i c increased. After incorporation of ZrO 2 , the grains initially decreased to 12 nm and later increased to 18 nm. The structure of the deposit is a face-centered cubic phase. With the increase of molybdate content, the preferential Ni (220) crystal plane was changed to oriented (111) plane. The Ni–Mo alloy comprises 91 wt% Ni and 5.4 wt% Mo. R a of Ni–Mo–ZrO 2 was 73 ± 4 nm. Ni–Mo alloys obtained at 20 mA cm −2 and 2 g L −1 molybdate possess the best corrosion-resistant behavior. Incorporation of ZrO 2 can strengthen electrochemical stability and anti-wear behavior of Ni–Mo alloy. The inclusion of ZrO 2 refined the grain size from 18 to 12 nm. The Ni–Mo/ZrO 2 coatings electrodeposited under 2–4 g L −1 Na 2 MoO 4 ·2H 2 O, 20–40 mA cm −2 , 10–15 g L −1 ZrO 2 have excellent wear and corrosion resistance.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Xingbo Qi,Lei Ni,Ziyan He,Xu Sun,Hejie Lu,Haiqiang Li,Ruixi Meng,Maosen Fu,Xiao Ma
Cobalt-free, nickel-rich layered oxide cathode material LiNixMn1-xO2 (NM) has attracted much attention due to its high specific capacity and low cost. However, cobalt-free cathode materials have more serious problems such as Li/Ni disorder and structural degradation compared to ternary LiNixCOyMn1-x-yO2 (x ≥0.5, NCM) cathodes. To address these challenges, LiNi0.6Mn0.4O2 (NM64) and a series of Mo-doped Li(Ni0.6Mn0.4)(1-x)MoxO2 (x = 0, 0.01, 0.02, 0.03, 0.04, 0.05) cathode materials were designed and prepared by high-temperature solid-phase method, and the effect of Mo doping on the structure and electrochemical performance of NM64 cathodes was systematically investigated. Mo doping not only suppresses Li/Ni mixing and enlarges interlayer spacing but also effectively inhibits primary particle overgrowth, resulting in refined particle morphology that enhances structural stability and Li+ transport kinetics. Consequently, the Mo-doped NMM cathodes exhibit more stable interface with significantly suppressed side reactions. Li(Ni0.6Mn0.4)0.98Mo0.02O2 cathode exhibited superior capacity retention of 86.83% after 100 cycles at 1.0 C (at 25℃ and 2.8-4.3 V), surpassing the NM matrix by 8.98% and demonstrating the remarkable cycling stability improvement. This work elucidates the structural and interfacial stabilization mechanisms induced by high-valent Mo doping, providing an effective approach to developing high-performance Co-free layered oxide cathodes.
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