Materials Research Express
·
2019
·Vol. 6
·期 12
·126586
·
IF 1.449
Zhuangzhi Wu,Xin Liu,Dezhi Wang
A traditional preparation process of Mo powder is generally time-consuming and leads to coarse particles. In this work, we propose a short-flow strategy, in which the intermediate product of MoO2 is prepared by a one-step self-reduction method in air instead of a mixture of decomposition and hydrogen reduction processes. And the reaction mechanism of self-reduction is investigated and the consequent sintering performance of Mo powder is also compared with the traditional one. The obtained results demonstrate that the finally synthesized Mo–La2O3 powder prepared by the self-reduction strategy are spherical with an average particle size of 2.03 μm, exhibiting an excellent sintering performance with a relative density of 95.3% and a hardness of 260.6 (HV), better than those by a traditional one (93.4% and 232.4 (HV)), which can be attributed to smaller particle size and better shapes. This work provides a new route for the synthesis of Mo–La2O3 powder, indicating a possible industrial application.
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高影响因子
Materials Today Energy
·
2021
·
IF 7.311
Yutong Li,Tianyi Dai,Quanxuan Wu,Xingyou Lang,Lijun Zhao,Qing Jiang
NiFe layered double hydroxide (LDH)-based materials arouse great attention because of their outstanding catalytic activity for oxygen evolution reaction (OER) under alkaline conditions. However, its catalytic activity for hydrogen evolution reaction (HER) under alkaline conditions is relatively poor. Herein, to improve the HER catalytic activity of NiFe LDH under alkaline conditions, we design a heterostructure of NiS and NiS 2 on NiFe LDH and successfully achieve Mo element doping . The catalyst named NiFe-LDH@Mo–NiS–NiS 2 /NF possesses a three-dimensional nano-flower-like structure and shows an outstanding catalytic performance for both HER and OER. Specifically, in 1 M KOH solution, it requires the low overpotentials of 261 and 120 mV to achieve the current density of 50 and 10 mA cm −2 for OER and HER, respectively. Simultaneously, when NiFe-LDH@Mo–NiS 2 –NiS/NF is used as the bifunctional catalysts, it only needs a low voltage of 1.63 V to achieve a current density of 10 mA cm −2 . The outstanding catalytic performance is attributed to its special heterostructure and the synergy between Mo and NiS x , resulting in comparability with most reported non-noble metal-based catalysts. The doping of metal elements and the construction of heterostructures provide new ideas for the structure regulation and performance improvement of bifunctional electrocatalysts .
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Bo Wang,Yanhong Liu,Jinhui Hao,Junbo Zhong,Furong Yu,Kewei Zhang,Hao Shen,Baodong Mao
Earth-abundant metal sulfides attracts large attention in recent years for hydrogen production via electrocatalytic water splitting. However, most works have been limited to the acidic condition, whereas the hydrogen evolution reaction (HER) in alkaline condition has rarely been discussed. Here we present an effective strategy for the growing of Co-Mo-S catalysts on carbon cloth via the controllable incorporation of cobalt into MoS 2 with L-cysteine and phosphomolybdic acid to achieve the synergistic interaction of CoS 2 and MoS 2 . The optimized Co-Mo-S catalysts (Co:Mo=1:2) showed a largely improved HER activity with an overpotential of 92 mV at current density of 10 mA cm -2 and Tafel slope of 82 mV dec -1 . The origin of the activity enhancement was investigated through a series of characterizations, where the synergetic effect of the intrinsic fast HER kinetics of metallic CoS 2 and the high active surface area of MoS 2 plays a crucial role. With appropriate amount of cobalt, the Co-Mo-S catalysts show a relatively uniform distribution on the carbon cloth to ensure the large surface area, whereas excessive cobalt results in the formation of the large CoS 2 particles with low HER activity from the low active surface area. Further electrochemical measurements demonstrated that the combination of larger exchange current density of CoS 2 and the high electrochemical double–layer capacitance (proportional to the active surface area) of MoS 2 together contributed to the HER activity enhancement of the Co-Mo-S catalysts. The Co-Mo-S/CC catalysts also show robust stability in alkaline solution. Our work provides a more profound understanding and an interesting view for the design of efficient ternary transition metal sulfide HER catalysts in alkaline condition by synergetic optimization of the intrinsic HER kinetics and the electrochemical active surface area.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mingyong Jia,Qianshun Cui,Yueqi Wu,Chengquan Shen,Qiang Shen,Fei Chen
Given the insufficient wettability and compatibility between ceramic and metal, heterogeneous grain boundaries in particular composites consistently represent the primary failure sites related to both mechanical loading and chemical corrosion. To solve as above–mentioned problem and improve the interfacial bonding of ceramic/metal composites, we performed a novel strategy to modify the grain boundaries of AlN/Mo composites via Ni nanoparticles , which was produced via rotary chemical vapor deposition . Without sacrificing ductility, a substantial 46.1 % increase in bending strength was successful attained arises from the combined influence of grain boundary density and diffusion depth, interfacial structure and electronic properties. In view of the limitations of the traditional blending methods, this study made full use of random nucleation characteristics during the oxidation/reduction process in RCVD to form uniform nanoparticle coating on the surface of AlN powder, thereby avoiding potential risks to AlN/Mo composites, such as brittle intermetallic compounds , localized performance variations.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hongtao Liu,Zekai Qin,Xueli Wang,Maolin Tian,Wenjie Zhang,Lin Li,Jiawei Wen,Guoyong Huang,Shengming Xu
Spent hydrodesulfurization catalysts contain more than 10 ∼ 25 wt% V, Mo and Co, which are not only hazardous materials, but also can be considered as valuable secondary resources. The complete separation of these complex critical metals by solvent extraction still needs to be improved. Here, a selective extraction route for the separation of V/Mo/Co is proposed based on the weak interaction differences between extractants and metal, which is realized by theoretical calculation and experimental verification. This process does not require pretreatment of N1923 and Cyanex272 (C272), thus reduced the consume of acid and base as well as generation of waste water. With the preliminary results of V/Mo, Co/Mo, and V/Co separation, the weak interaction between extractants and metal molecules was revealed by quantum chemical calculations quantitatively. The molecular charge distribution, surface electrostatic potential distribution (ESP) and the average local ionization energy (ALIE) shows the priority reactivity of the metal molecules as: H 6 V 10 O 28 > H 2 Mo 4 O 13 > H 4 V 4 O 12 > H 3 VO 4 > H 2 MoO 4 . The independent gradient model based on Hirshfeld partition (IGMH) show differences in the weak interaction forces as: N1923-V>C272-Mo > C272-V>N1923-Mo > C272-Co. The selective separation process of V/Mo/Co was designed with the guide of above results. The combined recovery of the three metals V, Mo and Co amounted to 83.88 %, 87.08 %, and 99.01 %, respectively. The whole route reduces 3.92 t sulfuric acid and 7.83 t sodium hydroxide per solid, and reduces 1.99 t carbon emissions compared to the conventional route.
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产品关联
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 .
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 6
·3014-3025
·
IF 3.9
Cheng Li-Qian,Pan Jingye,Chen Kai,Hao Xuxia,Xie Xinyuan,Dong Xinrui,Wang Zixuan,Liu Ruiping,Feng Ming
TiNb 2 O 7 (TNO) is a promising anode for lithium-ion batteries owing to its high theoretical capacity, minimal volume expansion, and effective suppression of lithium dendrite formation. Nonetheless, the low electrical conductivity of TNO presents a barrier to practical application. Thus, a Mo 6+ doping strategy was utilized to address the conductivity issue, and TNO- x Mo ( x = 0, 0.05, 0.10, 0.15, 0.20) anodes were prepared by a solid-state method. The incorporation of Mo 6+ ions result in a charge redistribution, which can elevate electronic conductivity and accelerate ion diffusion. What’s more, by precisely controlling the Mo 6+ ion concentration can regulate the morphologies of the TNO, enabling it to expose more fast-ion conducting (020) facets. The synergistic effect of the above two factors significantly enhances the conductivity and electrochemical properties of the TNO anode. As a result, the optimal TNO-0.05Mo with 2D lamellar structure exhibits a high discharge capacity of 347.6 mAh g −1 at 0.1C, superior rate performance, and an excellent cycle lifespan, with retention of 78% after 1500 cycles at 1.5C/1.5C. Meanwhile, the solid-state battery with TNO-0.05Mo as anode also displays improved rate and cycle performance than the liquid-state battery, indicating the great application potential for the next-generation energy storage devices.
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高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Qing-Shuai Zhang,Yu-Le Wang,Li Yue,Yu-Dong Shan,Song-Hai Wu,Yong Liu,Xu Han
Although selective oxidation of benzene to phenol (SOBP) by H2O2 is an important chemical process, overoxidation of benzene by the produced nonselective •OH during the activation of H2O2 inevitably reduces the oxidation selectivity. We, therefore, attempt to mediate the oxidation selectively by using electrophilic KHCO3 in the oxidation system. In this study, Mo–Cu/NC has been successfully synthesized via ball-milling bimetallic Mo–Cu and N-doped carbon, which exhibits high reactivity in SOBP by H2O2 and KHCO3 with a desirable phenol yield of 25.1% and selectivity of 100%. A series of characterizations and DFT calculations reveal that the reaction between H2O2 and KHCO3 produces HCO4–, which is then moderately activated on Mo1Cu2/NC via the nonradical pathway with the formation of Mo-(η2-O2) peroxo. Meanwhile, Ov at Mo1Cu2/NC facilitates the adsorption of benzene, which is then selectively oxidized by Mo-(η2-O2) peroxo to phenol via the oxygen atom transfer pathway. This study provides new insights on the importance of Mo-(η2-O2) peroxo mediated by H2O2–KHCO3 in selective oxidation of aromatic C–H bond via the nonradical pathway.
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yu Liu,Lu Han,Jinhao Zhang,Ruxue Yao,Haoqi Zhan,Huawei Yang,Liangjiu Bai,Lixia Yang,Donglei Wei,Wenxiang Wang,Hou Chen
O2 activation for the green conversion of chemicals has attracted a great deal of attentions in the field of chemistry. Developing catalysts for aerobic oxidation with both prominent instinct activity and desirable micro/nanostructure remains a tough challenge. In this work, hierarchical hollow Co–Ni–Mo–O mixed metallic-oxide nanotubes constructed by ultrathin CoMoO4/NiMoO4 nanosheets were fabricated using a sacrificial template method and employed as catalysts in aerobic oxidative desulfurization (AODS) of a model fuel. With air as the oxygen source, the catalyst demonstrated surprisingly high activity by achieving complete conversion of dibenzothiophene under mild reaction conditions. Besides, the catalyst demonstrated excellent stability on continuous repeated use. A further mechanism study reveals the electron coordination and transfer between different metal species as well as the activation route of O2. Based on the above-mentioned results, the catalyst which allows a good exposure of metal centers, a high concentration of oxygen vacancies, and the desired electronic structure is expected to serve as the high-performance AODS catalyst.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 45
·19868-19879
·
IF 3.288
Sleshi Fentie Tadesse,Dong-Hau Kuo,Worku Lakew Kebede,Lalisa Wakjira Duresa
Discharging of organic pollutants from industrial activities into the water bodies is a common worldwide problem, which can adversely affect human life and the environment. Recently, many efficient, eco-friendly, and cost-effective photocatalytic methods have been investigated for environmental remediation. In this study, a simple and facile precipitation method at low temperature was proposed for the synthesis of V-doped Mo(O,S)2 oxysulfide. The crystallinity, morphology, elemental composition, and optical and electrical properties of the as-synthesized materials were characterized by XRD, Raman spectroscopy, FT-IR spectroscopy, FE-SEM, TEM, XPS, PL, and EIS. The photocatalytic performance of both bare and V-doped Mo(O,S)2 was evaluated in the degradation of methylene blue (MB) dye. The holes (h+) and hydroxyl radicals (OH˙) were identified as the main oxidative species for MB degradation. V-Mo(O,S)2-10 synthesized with 10% vanadium precursor showed the highest photocatalytic efficiency for MB degradation under visible light irradiation with an apparent rate constant of 0.028 min−1, which was much greater than that of bare Mo(O,S)2 at 0.0098 min−1. Besides, V-Mo(O,S)2-10 had the lowest recombination rate of electron–hole pairs and charge transfer resistance to enhance the photocatalytic activity, as evidenced by PL and EIS analyses. Therefore, V-doped Mo(O,S)2 can be a potential candidate for photocatalytic degradation of organic dyes for environmental remediation.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Miaomiao Xiang,Huihui Liu,Chenxi Huang,Yue Li,Hualing Zeng,Xiang Shao
Molybdenum disulfide (MoS2) has attracted considerable interest due to its superior electronic and optical properties, which have seen promising applications in optoelectronics and catalysis. Chemical vapor deposition (CVD) has been successfully applied in synthesizing MoS2 on various substrates. However, it remains a great challenge to fabricate high-quality MoS2 sheets with well-controlled micro/nano size and homogeneous distribution over the functional substrates such as active metal oxides. Herein, we have developed a two-step synthetic strategy via depositing MoO3 first followed by subsequent vulcanization, to grow single-layer MoS2 on an atomically flat rutile TiO2(110) (r-TiO2(110)) substrate. This method not only very well controls the size as well as the spatial distribution of MoS2 nanosheets over the TiO2 surface but also averts the formation of contaminative species at the heterojunction while maintaining the atomic structure of the substrate surface. The extensive characterizations reveal that the formation of MoS2 derives from the sulfurization of the singly dispersed Mo6+ and Mo5+ species in the surface/subsurface region instead of the aggregated MoO3 patches on top of the TiO2 surface. Such a mechanism may dictate a general way for synthesizing high-quality transition-metal dichalcogenides (TMDs) over a variety of functional substrates.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 6
·2591-2599
·
IF 3.069
Jing Xu,Yue Wang,Yunxiang Cao,Zhengke He,Lianming Zhao,Ubong Jerome Etim,Peng Bai,Zifeng Yan,Pingping Wu
A foam-like mesoporous silica (MCF)-supported gold (Au) nanoparticle (NP) catalyst was prepared by a facile one-pot synthesis strategy. SnOx and MoOx were introduced as promoters by a wet impregnation method to synthesize promoted catalysts Au–SnOx/MCF and Au–MoOx/MCF, respectively. The evaluation of the prepared catalysts in benzyl alcohol oxidation shows that introduction of a low amount of SnOx (0.2 wt%) leads to a higher catalytic activity, while a relatively high amount of SnOx (1.0 wt%) exhibits a lower catalytic activity than the unpromoted Au NP catalyst. Both characterization results and density functional theory (DFT) calculations suggest that the most important effect of SnOx species on gold catalysts is the strong interaction between them which leads to electron transfer and lattice distortion of Au NPs, providing more low-coordinated Au active sites. This structural modification enhanced the chemisorption of reactants and lowered the energy barrier for the dissociation of O2 molecules on the surface of gold catalysts, improving the catalytic performance for benzyl alcohol oxidation. However, a weaker interaction was detected between MoOx and Au NPs on catalysts Au–MoOx/MCF and no lattice modification was observed; thus no improvement in the catalytic activity for benzyl alcohol oxidation occurred on catalysts Au–MoOx/MCF.
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