Chemistry-An Asian Journal
·
2018
·Vol. 13
·期 6
·641-647
·
IF 3.692
Lifang Xie,Ting Chen,Hang Cheong Chan,Yijin Shu,Qingsheng Gao
Graphical The straight dope : Controlled hydrogen doping into MoO 3 supports by means of H 2 spillover was introduced to vary the metal–support interactions with Ir, thereby achieving efficient hydrogenation of furfural to furfuryl alcohol under mild conditions (see figure). As promising supports, reducible metal oxides afford strong metal–support interactions to achieve efficient catalysis, which relies on their band states and surface stoichiometry. In this study, in situ and controlled hydrogen doping (H doping) by means of H 2 spillover was employed to engineer the metal–support interactions in hydrogenated MoO x -supported Ir (Ir/H−MoO x ) catalysts and thus promote furfural hydrogenation to furfuryl alcohol. By easily varying the reduction temperature, the resulting H doping in a controlled manner tailors low-valence Mo species (Mo 5+ and Mo 4+ ) on H−MoO x supports, thereby promoting charge redistribution on Ir and H−MoO x interfaces. This further leads to clear differences in H 2 chemisorption on Ir, which illustrates its potential for catalytic hydrogenation. As expected, the optimal Ir/H−MoO x with controlled H doping afforded high activity (turnover frequency: 4.62 min −1 ) and selectivity (>99 %) in furfural hydrogenation under mild conditions ( T= 30 °C, P =2 MPa), which means it performs among the best of current catalysts.
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RARE METALS
·
2023
·Vol. 42
·期 5
·1516-1525
·
IF 8.8
Wang Mei-Ling,Zhao Jin,Wang Jin-Jin,Zhang Jun-Ming,Tian Yu-Zhu,Yue Zhi-Zhu,Li Dong,Hu Tian-Jun,Jia Jian-Feng,Wu Hai-Shun
metal oxide electronic interactions in composite electrocatalysts have a considerable impact on their catalytic capability. In this study, we successfully synthesized an electrocatalytic material composed of MoO 3 /C species-supported Pd nanoparticles (Pd-MoO 3 /C) using a convenient hydrothermal method, which exhibited excellent catalytic activities for both ethanol oxidation and oxygen reduction in KOH media. The specific activity of Pd-MoO 3 /C toward ethanol oxidation with MoO 3 loading (40 wt%) was ~ 2.6 times greater than that for the commercial Pd/C (10 wt%) with the same Pd content. In particular, the activity could effectively hold up to ~ 60% of its maximum activity after 500-cycle tests, demonstrating improved cyclical stability. Notably, the fast electron transfer kinetics toward oxygen reduction for Pd-MoO 3 /C (40%) were also comparable to those of commercial Pt/C (20 wt%) catalysts. These superior electrochemical features are primarily derived from the stronger electronic coupling between Pd and MoO 3 through charge transfer, which can supply more active centers and improve the anti-poisoning ability. Meanwhile, the MoO 3 species in the Pd-MoO 3 /C composite may provide additional benefits in terms of electrical conductivity and dispersion. Graphical Abstract
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PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
·
2023
·Vol. 260
·期 4
·2200455
·
IF 1.6
Yijun Wang,Jinhua Li,Kaixi Shi,Fengxue Tan,Wanyu Wang
All-inorganic lead halide perovskite CsPbBr 3 has received a lot of attention in the field of optoelectronic devices due to its high absorption coefficient and photoelectric conversion efficiency. Using a heterojunction as the core of a photodetector (PD) to transform the optical signal into an electrical signal compensates for the deficiencies of using a single material. Here, a simple and efficient chemical vapor deposition (CVD) method is used to fabricate a CsPbBr 3 /MoO 3 /ITO heterojunction PD with superior photoresponse properties, including photoresponsivity of 37.209 A W −1 and detectivity of 1.64 × 10 12 Jones at bias voltage of 3 V. Compared with pure CsPbBr 3 perovskite, the responsivity of the PD is 3.54 times as great. As a photosensitive layer, CsPbBr 3 absorbs photons and releases electrons due to its high optical absorption coefficient. The introduction of MoO 3 plays a role in promoting the separation and transport of photogenerated carriers of the heterojunction structure and improves device performance. This study provides groundwork facilitating the use of CVD for in situ growth of high-performance all-inorganic perovskite heterostructures to realize the prospect of large-scale production of perovskite PDs.
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Nanomaterials
·
2022
·Vol. 12
·期 4
·635
·
IF 5.719
Mi Zhang,Hui Ren,Qingzhong Cui,Hanjian Li,Yongjin Chen
In order to improve thermal conductivity, energy performance, and combustion performance of the aluminum-containing thermite, nanocarbon materials were added to thermite. Aluminum/molybdenum and trioxide/nanocarbon materials (Al/MoO3/NCM) were fabricated by electrostatic spinning technology. The Al and MoO3particles of the nAl/MoO3/NCM thermite are much smaller than nitrocellulose (NC); thus, the two components can be better attached to NC fibers. Results on thermal conductivity demonstrated that the addition of NCM can improve the thermal conductivity of Al/MoO3, and the addition of reduced graphene oxide (RGO) has a more significant impact on thermal conductivity. Energy performance analysis results indicated that the energy performance of Al/MoO3/NCM thermite spinning is the best when the value of combustion oxygen equivalent ratio (Φ) is 0.90–1.00. The combustion performance results show that the addition of NCM can significantly increase the combustion rate of thermites, and the addition of RGO improves its combustion rate the most, followed by carbon nanotubes (CNT) and nanoflake graphite (NFG) being the lowest. By changing the shape of the Al/MoO3/NCM charge and the internal composition of the charge, the sensitivity of the agent can be adjusted, and the matching performance and use performance of the electric igniter can be improved.Keywords:Al/MoO3/NCM;electrostatic spinning;thermal conductivity;energy performance;combustion performance
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ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Yage Li,Sabry M. Shaheen,Muhammad Azeem,Lan Zhang,Chuchu Feng,Jin Peng,Weidong Qi,Junxi Liu,Yuan Luo,Yaru Peng,Esmat F. Ali,Ken Smith,Jörg Rinklebe,Zengqiang Zhang,Ronghua Li
Removal of toxic chemicals from the environment using novel adsorbents is of great concern. In this study, a novel composite of molybdenum trioxide (MoO 3 )-engineered biochar (MoO 3 -BC) was derived from corn straw and synthesized for the removal of Pb(II) from water. The pyrolysis temperature of 600 °C was suitable for the thermal self-assembly of MoO 3 -BC. Although MoO 3 -BC had lower S BET (59.3 m 2 /g) than the pristine BC (157.8 m 2 /g), it had a stronger adsorption affinity to Pb(II). The Pb(II) removal capacity of MoO 3 -BC was 229.87 mg/g at pH 4.0, and the adsorptive removal of Pb(II) was fit using a pseudo-second-order model and the Langmuir model. High temperature favored the removal of Pb(II) by MoO 3 -BC; However, the removal of Pb(II) was inhibited with increasing the ion strength. The MoO 3 -BC revealed an acceptable stability and reusability, since the removal efficiency of Pb(II) remained above 80.7%, even after 8 cycles. The MoO 3 -BC effectively reduced ≥99.9% of Pb(II) in the polluted irrigation water. The Pb(II) removal mechanisms involved surface electrostatic attraction, ion exchange and surface complexation. These findings conclude that the MoO 3 -BC is a novel composite that can be used for the removal of Pb from contaminated water . More studies are needed to investigate the potentiality of MoO 3 -biochar composite for the removal of other metals from water in a mono and competitive sorption system.
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Small Methods
·
2021
·Vol. 5
·期 11
·2100765
·
IF 14.188
Ruizhe Li,Wujie Dong,Jun Pan,Fuqiang Huang
The transition metal oxides (TMOs) with high volumetric capacities are promising anodes for the future electronics, however, they usually suffer from severe capacity decay and poor rate capability. Carbon hybridization and nanosizing can resolve these challenges, yet these significantly compromise the volumetric capacity. Herein, both high capacity and long cycling stability are simultaneously achieved in the micrometer-sized Mo-based oxide particles by designing the dual conductive MoO 2 /β-MoO 3- x mosaics. The rational combination of the highly electronically conductive MoO 2 with the highly ionically conductive and open-structured β-MoO 3 achieves a promising volumetric capacity of 1742 mAh cm −3 , which is four times higher than the commercial graphite. Simultaneously, both stable cycling performance (87% retention after 500 cycles) and excellent rate capability (outperformed a majority of the MoO 2 -based anodes reported in literature) are obtained in the lithium-ion batteries. For the sodium-ion batteries, the composite exhibits three times higher Na + storage than pure MoO 2 . Moreover, the decisive role of the bond energy on the electrochemical performance of TMOs is also identified. This study may open up new perspectives for choosing and designing the TMO anodes with a high volumetric capacity for the practical applications.
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Materials Research Express
·
2020
·Vol. 7
·期 11
·115009
·
IF 1.929
Jialin Chen,Tao Guo,Miao Yao,Jiaxing Song,Wen Ding,Yiming Mao,Shi Li,Rui Zhu
To investigate the effect of the addition of poly (vinylidene fluoride) (PVDF) on nanothermites, Al/MoO3/PVDF energetic nanocomposites were prepared using electrospraying method. As a control group, Al/MoO3 was also designed. Then, both samples were tested by FE-SEM, XRD and TG-DSC. TG-DSC results showed that the Al/MoO3/PVDF energetic nanocomposites released more than 934.0 J g−1 with two obvious exothermic peaks. Compared with the control group of 800.7 J g−1 heat, it changed the thermal performance to some extent. There were Mo2C among the residues products after the reaction via XRD. The activation energy (Ea) was analyzed using the Kissinger method under different heating rates by DSC. The addition of PVDF reduced the Ea of the thermites. To explore the combustion performance, a preliminary experiment was designed. The Al/MoO3/PVDF energetic nanocomposites were easier to ignite and the burning was more durable, which was significant in solid propulsion and applications requiring extended combustion time.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 24
·30243-30253
·
IF 3.056
Xu Wenqing,Gao Lei,Yang Yang,Zhu Tingyu,Qi Guisheng
The deposition of NH 4 HSO 4 on catalysts is one of the key issues for selective catalytic reduction of NO x . In this study, NH 4 HSO 4 was preloaded on catalysts, and the effects of MoO 3 and CeO 2 doping on the decomposition and reactivity of NH 4 HSO 4 on V 2 O 5 /TiO 2 catalysts are studied. The results show that the introduction of MoO 3 and CeO 2 significantly promoted NO x conversion on the V 2 O 5 /TiO 2 catalysts. Doping with MoO 3 could effectively enhance the S and H 2 O resistance of the catalysts. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis indicate that it is the strong chemical interactions between NH 4 HSO 4 and the catalysts that are adverse to the decomposition of NH 4 HSO 4 . However, doping with MoO 3 apparently inhibits these interactions, which significantly decrease the decomposition temperature of NH 4 HSO 4 . In situ FTIR experiments show that the NH 4 + in preloaded NH 4 HSO 4 could react with gaseous NO on catalysts, and doping with MoO 3 could facilitate the reaction rate.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Hong Yan,Zengwei Zhu,Yumei Long,Weifeng Li
Graphitic carbon nitride (g-C 3 N 4 ) with desired microstructure and chemical functionalities has been drawing considerable interests in terms of their potential applications for environmental treatment and clean energy production. Herein, a novel structure of MoO 3-x ―intercalated g-C 3 N 4 (Mo-g-C 3 N 4 ) and the synthesis strategy were demonstrated by using melamine molybdate as a precursor. The single-source precursor of melamine molybdate ensured the homogeneous mixing between MoO 3-x and g-C 3 N 4 at molecular level. Meanwhile, the strongly chemical interaction between melamine and molybdate promoted the in-situ intercalation of MoO 3-x into g-C 3 N 4 interlayer. The intercalation of MoO 3-x not only improved the visible-light absorption ability, but also facilitated charge separation through interlayer pathway for g-C 3 N 4 . As expected, the Mo-g-C 3 N 4 possesses enhanced activity in the photo-degradation of methyl orange and photo-destruction of Escherichia coli ( E. coli ) bacteria illuminated by visible light. The radicals trap experiments revealed that the holes (h + ) are dominant species in the photocatalysis process over Mo-g-C 3 N 4 . Accordingly, a possible photocatalysis mechanism of pollutants over Mo-g-C 3 N 4 was developed. This study opens up a new way for optimizing microstructure of g-C 3 N 4 -based materials with favorable photocatalytic properties.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Cheng Feng,Congting Zhang,Chang Xu,Shuang Lin,Baohua Zhang,Huanxing Wu,Zheng Zhang,Xinming Guo,Haineng Bai,Fuqiang Guo
The detection of H 2 S for biomarkers or special occasions often requires a lower detection limit. In this work, the ppb-level H 2 S sensor based on MoO 3 /CuO/g-C 3 N 4 (MCC) was presented by a simple method. The characterized results show that MCC-2 possesses a larger specific surface area, and has more adsorbed oxygen and oxygen vacancy compared to MoO 3 and MoO 3 /CuO. The gas-sensitive test results show that the response of the MCC-2 sensor to 1000 ppb H 2 S is up to 8.24 at room temperature , which is 1.31 times of MoO 3 /CuO (6.28). More importantly, the theoretical detection limit of the MCC-2 sensor is as low as 1.1 ppb, which is the lowest in the recent H 2 S sensor. In addition, the MCC-2 sensor has reliable repeatability, excellent selectivity to H 2 S, and still maintains a high response after continuous test for 5 weeks. Simultaneously, the MCC-2 sensor also keeps an outstanding response at high relative humidity. The excellent gas sensing properties are due to the larger specific surface area that can enable more gases to be adsorbed on the material surface. In addition, the oxygen vacancy reduces the energy required to adsorb the target gas and the formed heterojunctions by MoO 3 /CuO/g-C 3 N 4 expedite carrier migration.
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APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Qingting Zhang,Andreas Goldbach,Na Ta,Wenjie Shen
Hexagonal molybdates ( h-MoO 3 ) include abundant Mo vacancies that are charge-compensated by cations residing within one-dimensional channels. Hence, they present an intriguing structural motif for Mo catalysis which has been hardly explored for selective oxidation of olefins. We discovered that NH 4 + and Ag + -exchanged h-MoO 3 display surprisingly varied behavior during propylene oxidation. Acrolein and acrylonitrile are the main partial oxidation products with the latter forming due to NH 4 + consumption. The catalytic activity more than doubles upon introduction of Ag + which also enhances selectivity for the main products up to ∼60 %. Unexpectedly, the hexagonal frameworks transform into orthorhombic α-MoO 3 40−60 °C below their reported stability limits already. In addition, Ag 2 Mo 4 O 13 and Ag nanoparticles segregate in case of Ag + -containing h-MoO 3 frameworks. The resulting Ag/Ag 2 Mo 4 O 13 /α-MoO 3 composites catalyze propylene conversion into acrolein with even higher selectivity (∼80 %). Detailed analyses indicate that Ag 2 Mo 4 O 13 drives formation of this oxygenate over these composites.
研究领域:
催化化学
·
材料科学
·
无机化学
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 2
·537-542
·
IF 3.069
Zhenyu Li,Fa Cao,Lei Wang,Zhiwu Chen,Xiaohong Ji
In this article, novel ternary MoS2/MoO3/TiO2 composite catalysts were developed. The photocatalytic performance of the ternary MoS2/MoO3/TiO2 composites was evaluated by photo-degradation of rhodamine B (RhB). It was found that the photocatalytic ability of the composites was strongly dependent on the mass ratio of MoS2–MoO3 to MoS2–MoO3–TiO2. The ternary composite catalyst with optimum composition showed a fast degradation rate (maximum ∼0.138 min−1), which could degrade over 95% of RhB solution (10 mg L−1) within 20 min under visible light (λ > 420 nm) irradiation. The possible photocatalytic mechanism was proposed based on the trapping photocatalytic experiment and band alignment of the composite. The synergistic effect of the strong absorption of the catalyst and the efficient separation of photogenerated electron–hole pairs by the novel ternary composite contributed to the enhanced photocatalytic activity.
研究领域:
材料科学
·
环境科学
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