Materials Research Express
·
2019
·Vol. 6
·期 5
·055041
·
IF 1.449
Yixue Li,Zhongxiao Song,Yanhuai Li,Sha Li,Hairong Wang,Baorui Song,Bo Gao,Xiaoye Du
In the present work, Mo4O11 @MoO3 nanobelts are successfully prepared by a two-step hydrothermal method. The nanobelts are about several micrometers in length and 200–300 nm in width with Mo4O11 nanoparticle on surface. The introduction of nanoparticles act as the adsorption sites which facilitate the adsorption of O2 and NO2 gas molecules, because of the point defects such as Mo5+ ions and oxygen vacancies inducing to increase the concentration of carriers, which synthetically contribute the sensing performance enhancement. The Mo4O11@MoO3 nanobelts show excellent sensing performance with 6 times enhancement with the decreased working temperature comparing with the pure α-MoO3 nanobelts. This study indicate that this kind of sensor show a promising application in NO2 detection.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
·
2025
·
IF 5.9
Fanli Meng,Weijia Cui,Yang Liu,Yanbai Shen,Zhenyu Yuan
In view of the poor sensitivity and upper detection limit of triethylamine gas sensors, high performance triethylamine sensor was prepared by adjusting the crystalline phase of MoO3. In this work, the orthorhombic phase MoO3 nanobelts were synthesized through hydrothermal method and used for the detection of triethylamine. The experimental outcomes indicate that the orthorhombic phase MoO3 gas sensor exhibits the peak responsiveness, which reaches 774.47 when the concentration of triethylamine is 100 ppm at 220°C accompanied by a theoretical detection threshold as minute as 10 ppb. The orthorhombic phase MoO3 sensor has superior selectivity for triethylamine stemming from the robust Lewis acid-base interplay with MoO3 and triethylamine and the C-N of triethylamine is easily broken. Finally, the sensing mechanism of orthorhombic phase MoO3 gas sensor is deeply analyzed. Since orthorhombic phase MoO3 possesses a narrow band gap and small size effect, and has a high adsorption energy for triethylamine, the gas sensor exhibits excellent performance. The strategic design of crystalline phase modulation serves as a pivotal approach to enhancing the properties of gas sensors.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
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
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-14
·
IF 12.264
Wang Yuanming,Wang Xue,Li Xiaolong,Liu Rong,Bai Yang,Xiao Huanhao,Liu Yang,Yuan Guohui
All-pseudocapacitive and highly deformable MXene hybrid film is successfully fabricated by a facile and efficient vacuum-assisted filtration of ultrathin MoO 3 nanobelts and delaminated MXene nanosheets.
The optimal M/MoO 3 hybrid electrode delivers an ultrahigh volumetric capacitance of 1817 F cm −3 (545 F g −1 ), which exceeds large majority of previously reported MXene-based flexible electrodes.
The symmetric supercapacitor presents excellent energy density of 44.6 Wh L −1 (13.4 Wh kg −1 ), indicating the electrode promising in achieving high-energy-density devices.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Qingting Zhang,Andreas Goldbach,Na Ta,Wenjie Shen
Some of the most active catalysts for the selective oxidation of olefins are based on molybdenum oxides or silver (Ag) systems. Hence, we furnished α-MoO3 nanobelts (NBs) with size-controlled silver nanoparticles (Ag NPs) in order to explore the synergies between these materials. Intriguingly, the components reacted with each other at 350 °C to generate a Ag2Mo4O13 skin on the NBs, which turned them into a very selective catalyst for propylene conversion to acrolein. The selectivity to this aldehyde improved from less than 20% over bare NBs to ca. 75% at 350 °C, in line with the apparent intrinsic limit of other unpromoted molybdates. Propylene oxide formation appears to be completely inhibited because of the encapsulation of residual Ag NPs by silver molybdate. The reaction kinetic characteristics over Ag2Mo4O13 are consistent with a Mars–van Krevelen mechanism. However, the apparent activation energies for reoxidation of silver molybdate (86.9 kJ mol–1) and propylene activation (37.9 kJ mol–1) are considerably lower than those reported for other molybdates. The acrolein formation rate over the coated NBs exceeds that over bulk Ag2Mo4O13 by more than a factor of 10 because of the similarly enlarged surface area. On the basis of the Ag content, the rate gain is even boosted by 4 orders of magnitude because only marginal noble-metal amounts (<0.3 wt %), i.e., Ag2Mo4O13, are needed for optimum catalytic activity of the composite. Altogether, these features render Ag2Mo4O13-coated MoO3 NBs as a prototypal design for highly efficient, nanostructured selective oxidation catalysts.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）