MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Mingjun Sun,Kuan Ding,Yujie Lu,Xiaopeng She,Yi Chen,Mengqing Wang,Cheng Zou,Xiaoyu Liu,Yong Zhou
Of diverse NH 3 gas-detection strategies applied in the fields of individual healthcare and industrial production, chemiresistive gas sensors gain the most popularity owing to the superior merits of low cost, convenient signal processing and high sensitivity. However, severe challenges still exist such as elevated operation temperature (>200 °C), limited sensitivity and unsatisfactory selectivity especially under low-concentration and high-humidity conditions. To overcome these hindrances, a sensing layer of black phosphorus nanosheets (BP)-modified α-MoO 3 nanoflakes was prepared in this work. After subtle optimization of ingredient composition and operation temperature, the composite sensor S2 could recognize NH 3 gas with the concentration spanning from 0.4 to 25 ppm at 40 °C. In particular, a larger mean response (27 % vs. ∼ 2.3 %) with a response/recovery speed of 275/388 s toward 10 ppm NH 3 and lower detection of limit (LoD, 0.4 ppm vs. 10 ppm) was achieved with respect to pure BP counterpart. In addition, excellent repeatability, selectivity, long-term stability and humidity-tolerant features were demonstrated for Sensor S2 . The improved sensing performance after α-MoO 3 incorporation was primarily ascribed to abundant p-n heterojunctions, excellent conductivity of BP and hydrophilic MoO 3 that mitigated the water corrosion effect on susceptible BP nanosheets. This work offers an alternative strategy for sensitive and low-temperature NH 3 detection, and well cater for the demanding requirements of high sensitivity and low-power consumption in the field of novel gas sensors applicable in the future Internet of Things and exhaled breath-oriented medical diagnosis.
研究领域:
材料科学
·
化学传感
·
生物医学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 36
·16482-16489
·
IF 3.591
Zhenzhen Yang,Bangchong Zhu,Yuhan He,Genlei Zhang,Peng Cui,Jianbo He
In this study, α-MoO3 nanobelts were successfully synthesized by a simple, green and economic hydrothermal method and applied as a bifunctional catalyst for one-step conversion of fructose to DFF under atmospheric air. The structure of the as-prepared α-MoO3 catalyst was characterized in detail by SEM, TEM, EDS, XRD, XPS, H2-TPR and NH3-TPD to better understand the relationship between structure and performance. α-MoO3 nanobelts exhibited high catalytic activities for production of DFF from HMF and fructose in atmospheric air. Under optimized reaction conditions, high DFF yields of 97.2% and 78.3% were obtained by using HMF and fructose as raw materials, respectively. Furthermore, a plausible reaction pathway was proposed for the selective oxidation of HMF to DFF according to the experimental and catalyst characterization results. Importantly, α-MoO3 is a robust catalyst that can be used at least five times without obvious loss in its catalytic activity. In brief, α-MoO3 is an easily-prepared, eco-friendly, low cost and highly effective catalyst which has potential application in one-step conversion of fructose to DFF under atmospheric air.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 15
·6723-6732
·
IF 2.7
Min Sun,Yu Zhang,Zhijun Liang,Rui Zhang,Kai Zhang,Yanhong Lin,Dejun Wang,Tengfeng Xie
Supercapacitors often deliver a significantly high-power density with a long cycling life but low energy density. An exceedingly promising approach is to construct asymmetric supercapacitors (ASCs) reconciling the compromise between power density and energy density. However, ASCs combining transition metal oxides (TMOs) and activated carbon (AC) struggle to improve energy density due to a vast difference in their specific capacitance. To cross this hurdle, we first proposed a new strategy to construct the ASCs with α-MoO3 as the anode and conductive polymer polypyrrole (PPy) as the cathode. The remarkable features of α-MoO3, including its layered structure and ultra-high specific capacitance, along with the stability and fast charge–discharge ability of PPy, have contributed significantly to the augmentation of power density and energy density in ASCs. Taking advantage of these bright features, the operation voltage for α-MoO3//PPy is effectively expanded to 2.0 V, exhibiting a high energy density of 25.9 W h kg−1 at 1538 W kg−1. Furthermore, the energy density presented a remarkable recovery rate, reaching 91.04% of its initial state after undergoing full rate tests. These conclusions reveal that the construction of α-MoO3//PPy can effectively enhance the energy density and power density of supercapacitors.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
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
·
凝聚态物理
·
光电子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yuying Wu,Zhangran Gao,Hao Li,Xiaofan Sun,Dong Li,Gang Zhou,Hong-Ling Cai,Xiaoshan Wu
Extraction or injection of charges through the interface in hybrid catalysts is a fascinating strategy for steering charge carrier transfer in solar energy conversion applications. Instead of interfacial charges regulation, we adopt intrinsic spontaneous polarization-modulated internal electric field to drive photo-generated carriers separation and transfer in both the bulk and surface for photocatalysis. Herein, we first report a series of nano-composites made of perovskite ferroelectric BiFe 0.9 Mn 0.1 O 3 and orthorhombic phase α-MoO 3 semiconductor (BFMO- x M, x = 0, 5%, 10%, 15%) via two-step thermal synthesis method. With × = 10%, the heterostructure exhibits significantly enhancement of optical response and photo-decomposion tetracycline capacity under sunlight compared with pure BFMO and M. The improved photocatalysis is attributed to the superimposed actions of the Z-scheme charge transfer through interface and the polarization field in BFMO for the anti-recombination of photo-excited electron-hole pairs. This work indeed offers a strategic design over multicomponent catalyst by consider the synergy of polarization charges and interfacial charge transmission for solar energy conversion.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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
Catalysts
·
2020
·Vol. 10
·期 3
·306
·
IF 3.52
Chunling Wu,Yang Luo,Kai Zhao,Xiaobing Yu,Xian Zhang,Xuqiang Guo
In this paper, direct coal liquefaction residue was prepared from Shen-dong coal, and the solubility of the residue in five organic solvents was studied. Then, an experimental device was set up to recover molybdenum (Mo) compounds from the direct coal liquefaction residue after extraction, and the influences of sublimation temperature and duration on recycling efficiency were examined. The recycled Mo-based products were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and a thermal analyzer. The results reveal that the optimum extraction conditions were obtained through ultrasonic extraction with a quinoline solvent and the highest recycling efficiency occurred for sublimation at 900 °C for 30 min. The recycled products are identified to be α-MoO3crystals. Moreover, the α-MoO3crystal is thermally stable before the temperature reaches its melting point.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Qingliang Feng,Kaiyue Duan,Hong Xie,Muyin Xue,Yongling Du,Chunming Wang
Two dimensional (2D) transition metal dichalcogenides have attracted intense potential application in catalytic because of its fantastic physical and chemical properties. But, how the metal oxide affects the catalytic performance of transition metal dichalcogenides was not clear yet, which always exists as main byproduct in the synthesized process of hydrothermal method . Herein, we report synthesis of 2H-MoSe 2 nanoflower and 2H-MoSe 2 /α-MoO 3 heterostructure by hydrothermal method. The chemical composition , morphology and crystalline structure of nano-composite were characterized by field-emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The 2H-MoSe 2 nanoflower shows more positive onset overpotential around −150 mV and a current density of 32.5 mA cm −2 at −300 mV. The smaller Tafel slope of 2H-MoSe 2 nanoflower is around 69 mV dec −1 reveals the Volmer-Heyrovsky mechanism for HER. The results of linear scan voltammetry (LSV) curves demonstrated that both of them displayed good stability. This work demonstrated that the metal oxide can reduce the catalysis performance of transition metal dichalcogenides towards HER.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xin-Yang Yue,Jing Zhang,Dong Chen,Xue-Jiao Xu,Hai-Tao Wu,Yong-Ning Zhou,Zheng Liang
Spatial hindrance of lithium polysulfide (LiPS) diffusion by inserting a barrier interlayer has been deemed as an effective strategy to restrict the shuttle effect in lithium–sulfur batteries (LSBs). However, the extra interlayer without reversible capacity production inevitably reduces the actual energy density of the battery. Herein, a freestanding α-MoO3 nanobelt interlayer with the decoration of TiN nanoparticles and carbon nanotubes (denoted as MCT) is established. To investigate the capacity compensation effect of the MCT during cell operations, X-ray absorption near-edge spectrometry is conducted. It is revealed that MoO3 can sustain a reversible Li intercalation/deintercalation in a voltage range of 1.8–2.8 V, providing 180 mAh g–1 of extra capacity for compensating sulfur cathode. In addition, the adsorption of the lithiated α-MoO3 toward LiPSs is further evaluated. By matching a high-loading sulfur cathode (3.0 mg cm–2), a superior capacity of 713.3 mAh g–1 can be retained after 100 cycles under the MCT assistance.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
✓ 已验证
DOI
高影响因子
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
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2021
·Vol. 30
·期 5
·3484-3491
·
IF 1.819
Gao Yong,Zhang Haibo,Xu Zengshi
Molybdenum trioxide holds the promise of high-performance cathodes for lithium-ion batteries. This study introduces a facile one-step method for large-scale synthesizing B, C co-doped α -MoO 3 single crystals by simultaneous decomposition of boric acid, carburization and vapor deposition on a molybdenum substrate. Experimental characterizations indicate that the B and C co-doping promotes the carrier mobility by inducing impurity states near the Fermi level. Additionally, when subjected to the high voltage, the Mo-C and Mo-B bonds become the controlling factors for enhancing the structural stability through the reduced interplanar spacing which facilitates the restriction of transition-metal ion migration. The target material delivers a high discharge capacity of 305 mAh g −1 with initial Coulombic efficiency of 98%, and shows remarkable cycle stability with a specific capacity of 280 mAh g −1 after 80 cycles. This study sheds light on a new strategy for designing and controlling of the doping activity in other transition-metal-oxides for next-generation lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）