Catalysis Science & Technology
·
2014
·Vol. 4
·期 11
·4010-4019
·
IF 4.76
Chao Lin,Kai Tao,Hongbo Yu,Dayin Hua,Shenghu Zhou
Molybdenum-doped mesoporous SBA-15, mesoporous SBA-15-supported MoO3/SBA-15, and traditional silica-supported MoO3/SiO2 were successfully synthesized. Various techniques, such as XRD, TEM, BET, UV-DRS, Raman, XPS and IR, were used to characterize the above obtained materials. The studies of TEM, XRD and BET confirmed that the highly ordered mesoporous structure of SBA-15 was maintained in the doped Mo-SBA-15 whereas supported MoO3/SBA-15 showed a significant reduction in surface area due to the deposition of MoO3 nanoparticles into the SBA-15 channels. XPS studies revealed that a high concentration of Mo5+ species appeared in doped Mo-SBA-15 whereas supported MoO3/SBA-15 and MoO3/SiO2 only contained Mo6+ species. The metathesis reaction of 1-butene and ethene to propene was used to evaluate the catalytic performance of Mo-containing materials. The doped Mo-SBA-15 illustrated a superior catalytic performance over the supported MoO3/SBA-15 and MoO3/SiO2 catalysts. The enhancement of catalytic performance for doped Mo-SBA-15 was assigned to the incorporation of Mo species into the SBA-15 framework. Due to the doping method, Mo-SBA-15 exhibited a well-ordered mesoporous structure, a high surface area, and a high concentration of Mo5+ species, which is beneficial to the catalytic performance for metathesis reactions.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 28
·6720-6726
·
IF 5.066
Xiaolong Lu,Rongguo Wang,Fan Yang,Weicheng Jiao,Wenbo Liu,Lifeng Hao,Xiaodong He
Lots of top-down approaches by weakening the van der Waals interaction between adjacent layers and breaking up the covalent chemical bonds in each layer have been reported to prepare QDs of layered materials due to the stacked structures. However, much attention has been focused on graphene and layered transition-metal dichalcogenides (TMDs), seldomly on layered transition-metal oxides (TMOs). Herein, a modified top-down method combining intercalation and thermal exfoliation is reported to prepare high-yield QDs of layered MoO3. Alkylamine was first intercalated into MoO3 layers to weaken the van der Waals forces. Then, the covalent bonds in each MoO3 layer were broken down under a sudden increase in gas pressure generated by the decomposition of alkylamines after rapid heating. These fractured particles were further incised to QDs by sonication. The as-prepared MoO3 QD dispersion showed a plasmon resonance after simulated solar light illumination. Surprisingly, their plasmon peak red shifted with an extended illumination time, which was different from the reported MoO3 nanosheets. This reported method is expected to extend to other QDs of layered materials providing that their bulk materials can also be intercalated.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
ACS Nano
·
2015
·
IF 12.881
Weiguang Xie,Mingze Su,Zebo Zheng,Yu Wang,Li Gong,Fangyan Xie,Weihong Zhang,Zhi Luo,Jianyi Luo,Pengyi Liu,Ningsheng Xu,Shaozhi Deng,Huanjun Chen,Jian Chen
The hydrogenation process of the layered α-MoO3 crystal was investigated on a nanoscale. At low hydrogen concentration, the hydrogenation can lead to formation of HxMoO3 without breaking the MoO3 atomic flat surface. For hydrogenation with high hydrogen concentration, hydrogen atoms accumulated along the <101> direction on the MoO3, which induced the formation of oxygen vacancy line defects. The injected hydrogen atoms acted as electron donors to increase electrical conductivity of the MoO3. Near-field optical measurements indicated that both of the HxMoO3 and oxygen vacancies were responsible for the coloration of the hydrogenated MoO3, with the latter contributing dominantly. On the other hand, diffusion of hydrogen atoms from the surface into the body of the MoO3 will encounter a surface diffusion energy barrier, which was for the first time measured to be around 80 meV. The energy barrier also sets an upper limit for the amount of hydrogen atoms that can be bound locally inside the MoO3via hydrogenation. We believe that our findings has provided a clear picture of the hydrogenation mechanisms in layered transition-metal oxides, which will be helpful for control of their optoelectronic properties via hydrogenation.
研究领域:
材料科学
·
纳米技术
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凝聚态物理
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2013
·
IF 2.672
Guangyu Zhao,Li Zhang,Kening Sun
Porous MoO 3 films are obtained by electrodepositing on Ni substrates. The galvanostatic charge/discharge tests show that, the film cathodes have a reversible capacity of 190 mA h g −1 at a current density of 30 mA g −1 between the voltage limits of 1.5–3.5 V vs. Li + /Li, a much better performance than the pristine MoO 3 powder. More than 75% capacitive contribution in the capacity of porous MoO 3 films is responsible for the high capacity, according to the cyclic voltammetry analysis. Another improved property of the porous MoO 3 films is the rate performance, which still retains 70 mA h g −1 at a current density of 1.25 A g −1 . The chronopotentiometry results reveal that, the prominent rate performances are owing to the high rate ability of the capacitive contribution.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Liang Dan,Long Hu,Hui Wang,Min Zhu
To improve the hydrogen sorption kinetics of MgH 2 , the MoO 3 nanobelts were added into MgH 2 by mechanical milling, leading to fine distribution of MoO 3 in the MgH 2 matrix. Compared to uncatalyzed MgH 2 , the hydriding and dehydriding rates of MoO 3 -catalyzed MgH 2 were significantly improved. The MgH 2 doped with 2 mol% MoO 3 exhibited fast dehydrogenation without activation, and the initial dehydrogenation amount of 5 wt% could be reached within 900 s at 300 °C. The dehydrogenation apparent activation energy is decreased down to 114.7 kJ/mol. The excellent catalytic effect of MoO 3 originates from its specific role as fast hydrogen diffusion pathways. In the hydrogenation process , the MoO 3 transformed to MoO 2 , resulting in the fading of catalytic activity .
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2022
·Vol. 74
·期 7
·2742-2749
·
IF 2.597
Zhang Rui-Hua,Hao Zhen-Hua,Shi Lin-Yuan,Chen Hao-Tian,Shu Yong-Chun,He Ji-Lin
In this present study, carbothermic reduction process of MoO 3 to produce MoO 2 has been carried to investigate the influences of reaction temperature and distance between activated carbon and MoO 3 on phase composition of reduction products by controlling carbon diffusion. Results show that the reduction degree increases with the increase of temperature and the decrease of distance between activated carbon and MoO 3 . MoO 3 can be completely reduced to MoO 2 at 680°C with the carbon distance of 1 mm. It is found that the transformation from MoO 3 to MoO 2 is a process of crystal cracking and growth by observing the phase transition and morphological evolution during the reduction. The massive MoO 3 is first decomposed into a platelet-shaped MoO x (2.75 < x < 3), then the platelet-shaped MoO x changes into a needle-like shape or irregular platelet-like Mo 4 O 11 , and finally Mo 4 O 11 changes into irregular granular or irregular platelet-like shaped crystals, which form MoO 2 powders.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Nannan Zheng,Jia Lu,Jiali Liu,Yinyan Xu,Hongwei Zheng,Xinle Xiao,Chunlei Dong
Phosphorus regulation tunes the electronic environment of g-C 3 N 4 nanotubes. • P-assisted interfacial interaction enhances MoO 3 /PCNNTs charge transport. • MoO 3 /PCNNTs shows reproducible RhB kinetics (0.16706 ± 0.00477 min −1 ). • Post-reuse analyses confirm operational retention and framework preservation. • Combined evidence supports an S-scheme-like working model with ROS generation. Developing efficient photocatalysts with tunable interfacial properties is important for pollutant removal. Here, phosphorus-modified graphitic carbon nitride nanotubes (PCNNTs) were coupled with α-MoO 3 to prepare MoO 3 /PCNNTs heterostructures. CNNTs, PCNNTs, MoO 3 /CNNTs, and MoO 3 /PCNNTs were compared to examine the effects of phosphorus modification and MoO 3 coupling. XPS revealed changes in the P-, Mo-, and O-containing chemical environments after MoO 3 coupling. Among the carbon-nitride-based samples, MoO 3 /PCNNTs showed the largest BET specific surface area (101.2 m 2 g −1 ), the smallest apparent optical band gap (2.72 eV), and the lowest fitted charge-transfer resistance (314.2 Ω). Under white-LED irradiation, the representative apparent pseudo-first-order rate constant of MoO 3 /PCNNTs for RhB removal was 0.1718 min −1 . Five independent experiments gave mean rate constants of 0.1671 ± 0.0048 min −1 for MoO 3 /PCNNTs and 0.1007 ± 0.0057 min −1 for MoO 3 /CNNTs. The composite also showed removal of MB, MO, and TC-HCl with pollutant-dependent responses, and maintained higher RhB removal than MoO 3 /CNNTs over six consecutive reuse cycles. Post-cycling characterization retained the characteristic morphology and bulk structural features, alongside changes in the surface chemical environment. These comparative results associate phosphorus modification and MoO 3 coupling with altered material properties and improved pollutant-removal performance under the tested conditions. Download: Download high-res image (203KB) Download: Download full-size image
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Jiayu Jin,Shuozhen Hu,Xinsheng Zhang,Shigang Sun
Palladium is a promising formic acid electro-oxidation (FAO) catalyst due to its higher initial activity than platinum. However, suffering from the adsorption of hydrogen and CO-like species, the activity and stability of Pd are still unsatisfied. Herein, palladium nanoparticles deposited on carbon supported molybdenum trioxide (Pd–MoO 3 /C) is prepared with MoO 3 as the promoter for FAO. X-ray photoelectron spectroscopy analysis proves the close contact between Pd and MoO 3 , which generates the hydrogen spillover effect and forms the Pd–Mo structure. The hydrogen spillover effect enhances the desorption of hydrogen from Pd and facilitates the FAO activity. Both the spillover effect and Pd–Mo structure contribute to the removal of CO ad and facilitate the durability and anti-CO poisoning ability of the catalyst. With the optimized ratio of MoO 3 to carbon black, the Pd–MoO 3 /C-20 catalyst owns the best specific activity of 5.86 mA cm −2 , which is 1.86 times of Pd/C.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2025
·
IF 17.1
Xinyi Hu,Guan Yu Chen,Liguo Chen,Yange Luan,Li Li,Junya Huang,Yinfen Cheng,Xiao Sun,Tao Tang,Yi Liang,Jinghao Zhuang,Haibo Huang,Mingsheng Ma,Zhifu Liu,Jian Zhen Ou
Photovoltaic effects in two-dimensional (2D) materials leverage atomic-scale quantum phenomena, enabling ultrathin energy-converting architectures beyond the limits of conventional semiconductors. The strong in-plane bonding combined with the interlayer van der Waals interactions in 2D metal-oxide semiconductors facilitates enhanced strain gradients for generating flexoelectric polarization. The polarization-induced built-in electric field further modulates the metal-semiconductor Schottky barrier, thereby controlling the material's photoresponse performances. Leveraging this mechanism, we synthesized single-crystalline 2D MoO 3 via chemical vapor deposition (CVD). Piezoresponse force microscopy (PFM) confirmed its robust flexoelectric properties, while conductive atomic force microscopy (C-AFM) induced large strain gradients to enhance photovoltaic response. This work establishes a pathway for flexoelectricity-driven photovoltaic control and performance augmentation in monolithic materials.
研究领域:
凝聚态物理
·
纳米能源材料
·
半导体器件物理
·
表面与界面科学
·
功能材料学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiaxin Yuan,Jianrui Feng,Gang Li,Yinghao Song,Na Yu,Xi Chen,Guanjie He,Yeshu Tan,Meng Ni
Developing efficient electrocatalysts for pH-universal hydrogen evolution reaction (HER) is particularly appealing due to the growing demands of clean and renewable energy. Herein, a facile electrodeposition method to construct Rh nanoclusters supported by molybdenum trioxide micro sheets (Rh/MoO 3 ) was developed. The use of MoO 3 support can enhance hydrogen production due to the accelerated electron transfer by Mo. The interaction between the interface of Rh and MoO 3 modulates the hydrogen adsorption energies. The interfacial electron transfer from Rh to Mo optimizes H 2 O adsorption, adjusts the d-band center, and fine-tunes the hydrogen binding energy, hence increasing the inherent hydrogen-evolving activities. Therefore, the Rh/MoO 3 catalyst shows outstanding performance with very low overpotentials of only 34, 49, and 29 mV at a current density of −10 mA cm −2 in 1.0 M PBS, 0.5 M H 2 SO 4 , and 1.0 M KOH electrolytes, respectively. Our findings also help to create effective catalysts for pH-universal HER by leveraging particle-support interactions.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2012
·Vol. 48
·期 3
·1328-1332
·
IF 2.105
Guangyu Zhao,Naiqing Zhang,Kening Sun
Porous MoO 3 films with an ultra-short relaxation time used for supercapacitors have been prepared in acid peroxo-polymolybdate solution by electrodepositing on Ni foam directly in this study. Electrochemical measurements indicate that, the films behave an ideal supercapacitor characteristic in Na 2 SO 4 electrolyte. The electrochemical impedance spectroscopy results demonstrate that, the films have a very low relaxation time constant (1 ms), which reveals a potential application prospect in filtering voltage ripple.
研究领域:
材料科学
·
电化学
·
储能
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenbin Wei,Hao Sun,Xiaofei Dong,Qiong Lu,Fangxia Yang,Yun Zhao,Jiangtao Chen,Xuqiang Zhang,Yan Li
Self-rectifying memristor with integrated excellent bio-synaptic behaviors are great potential to realize high-density memristor neuromorphic networks with self-inhibition of stealth current effect, but it’s still inferior and challenging yet achievable. Here, optoelectronic memristor in accordance with p-n heterostructured Cu 3 SnS 4 -MoO 3 (CTS-MoO 3 ) is developed. The Ag/CTS-MoO 3 /Mo memristor exhibits stable nonvolatile resistive switching with excellent spatial uniformity and high self-rectifying characteristics (rectification ratio >4000), which is beneficial to implement crossbar memristive synapse architectures. The memristor demonstrates not only concentrated Set/Reset voltage distribution (variation < 0.04 V/0.01 V), high On/Off ratio (>10 3 ) and long retention time (>10 4 s), but also continuously modulable conductance by applying electric pulses (triangular and square-wave) or various light (470–808 nm) stimulus. This behavior makes such memristor the ability to emulate vital bio-synaptic functionalities including excitatory and inhibitory, short-/long-term plasticity, spike-timing-dependent plasticity, as well as the learning-forgetting-learning process and Ebbinghaus forgetting rule. Moreover, the recognition rate for MNIST handwritten digits in such memristor based artificial neural network model is verified to be 89.3 % for neuromorphic simulations. The results dramatically facilitate the development of self-rectifying optoelectronic artificial synapse for future neuromorphic applications.
研究领域:
神经形态工程
·
材料科学
·
光电子学
·
非易失性存储器
·
人工智能硬件
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）