JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Ruihang Li,Luchao Ren,Le Xin,Pengchao Shao,Jia Wang,Zengli Gao,Panpan Lyu,Cuncheng Li,Hui Peng,Mingwei Zhang
This study optimizes the temperature coefficient of resonant frequency (τ f ) in CuMoO 4 ceramics from −36 to −8.82 ppm/°C through W 6+ B-site substitution. XRD analysis confirms the single-phase structure of CuMo 1- x W x O 4 ceramics, while Rietveld refinements reveal an expansion in lattice parameters. W 6+ substitution slightly reduces the relative permittivity (ε r ) due to the changes in sintering density and ion polarizability. Moreover, the internal effects of W 6+ substitution on the Q×f value are systematically investigated by analyzing the Raman peak's full width at half maximum (FWHM) and conducting packing fraction calculations. Additionally, lattice distortion and bond valence analyses elucidate the intrinsic mechanism behind τ f improvement. Consequently, when x = 0.08, CuMo 1- x W x O 4 sintered at 625°C exhibits superior overall performance: ε r = 5.13, Q×f = 65,506 GHz, τ f = −8.82 ppm/°C. Furthermore, it demonstrates good chemical compatibility with Al electrodes making the material more suitable for ULTCC practical applications.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yijie Yang,Yanjun Yu,Yuanhang Wu,Hongyi Chen,Jie Yang,Yu Luo,Yuan Hu,Congshu Huang,Hui Li,Jianzhi Wang
Designing ultrahigh energy density and mass-loading of electrocatalysts for hydrogen evolution is highly desirable but remains a great challenge. Herein, a 3D high-rise architectural structure consisting of dense Ni(OH) 2 nanoparticles on CuMoO 4 nanocube heterostructure arrays on Ni foam (Ni(OH) 2 /CuMoO 4 /NF) is developed via a hydrothermal reaction, calcination and electrodeposition method. Benefitting from the optimized electronic configuration, hierarchical high-rise architecture, and large specific surface area and mesoporous, the Ni(OH) 2 /CuMoO 4 /NF exhibits superior hydrogen evolution reaction (HER) activity in 1.0 M KOH solution. Ni(OH) 2 /CuMoO 4 /NF only requires low overpotential of 70 mV achieving a current density of 10 mA cm −2 with a low Tafel slope of 80 mV dec −1 , and superior long-term stability toward HER. This work provides a new structural design to high-rise architectural structures for efficient catalytic application.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Yanhua Wu,Hong Wang
A CuMoO 4 /MnO 2 /tourmaline (CMT) heterogeneous photocatalyst was successfully constructed by hydrothermal method followed by calcination and applied to activate peroxymonosulfate (PMS) for organic contaminant degradation over a wide pH range under visible light illumination. The CMT catalyst exhibited impressive degradation efficiencies of tetracycline hydrochloride (TC, 93.48%), safranine T (SaT, 100%), acridine orange (AO, 99.46%), methyl orange (MO, 97.47%), neutral red (NR, 94.10%), trypan blue (TB, 93.67%), methylene blue (MB, 90.36%) and rhodamine B (RhB, 89.85%) within 50 min. The influence of related parameters including catalyst dosage, PMS concentration, initial pH value, TC concentration, coexisting ions, humic acid (HA) and different water matrices on TC degradation were systematically investigated. According to quenching experiments and electron paramagnetic resonance (EPR) tests, e − , SO 4 •− , •OH, •O 2 − and 1 O 2 all contributed to TC degradation, and •O 2 − played a predominant role in the photo-Fenton-like process. The reusability of CMT was evaluated by consecutive experiments, and comparable removal efficiencies could be maintained after five cycles. The degradation pathways of TC were deduced and the toxicity of degradation intermediates based on HPLC−MS detection was estimated by Toxicity Estimation Software (T.E.S.T.). Moreover, the catalytic degradation mechanisms of TC in CMT/PMS/Vis system were further proposed and the role of tourmaline was illustrated. This work opens an avenue for the construction of heterogeneous catalysts based on natural minerals in PMS/Vis coupling system for wastewater decontamination .
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 8
·5393-5404
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IF 3.9
Wenjian Wu,Wenzhi Li,Mingwei Wu,Hao Zhang,Chen Zhu,Yihang Jiang
Upgrading methane into methanol or other high value-added chemicals is not only beneficial to mitigate the greenhouse effect, but also provides basic raw materials for industrial production. Nowadays, most research is limited to zeolite systems, and it is a considerable challenge to extend the support to metal oxides while achieving a high yield of methanol. In this paper, we take advantage of impregnation methods to synthesise a novel Cu/MoO3 catalyst, which can convert methane to methanol in the gaseous phase. At 600 °C, the Cu(2)/MoO3 catalyst can achieve a maximum STYCH3OH of 47.2 μmol (g−1 h−1) with a molar ratio CH4 : O2 : H2O = 5 : 1.4 : 10. Consequences of SEM, TEM, HRTEM and XRD substantiate that Cu is incorporated into the lattice of MoO3 to form CuMoO4. And transmission infrared spectroscopy, Raman spectroscopy together with XPS characterization techniques confirm the generation of CuMoO4, which is the main active site provider. This work provides a new support platform for Cu-based catalyst research in the methane-to-methanol system.
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Xinyuan Lyu,Luchao Ren,Le Xin,Zhengxin Li,Xianxin Zhang,Zheng Luo,Pengchao Shao,Yuxiao Zhang,Panpan Lyu,Mingwei Zhang
Fabrication of low-temperature co-fired ceramic (LTCC) densified at a low sintering temperature (<900 °C) is energy saving and environmentally friendly. Here, an interesting attempt has been made to lower the sintering temperature of MgGa2O4 by adding CuMoO4 for LTCC application. The sintering temperature of MgGa2O4 was remarkably reduced from 1410 to 900 °C, which contributed to energy saving. Furthermore, a series of studies on microstructure, sintering behavior, lattice parameters, and microwave dielectric characteristic of the samples were carried out. The occurrence of ion substitution between MgGa2O4 and CuMoO4, which affected the sintering densification, ionic polarizability, and Mg–O bond length, made the composites present various sintering and dielectric properties. Moreover, the full width half maximum (FWHM) value of the T2g peak in Raman spectra and lattice distortion were also analyzed to reveal the intrinsic interaction between structure and dielectric properties. Finally, the 0.5MgGa2O4–0.5CuMoO4 ceramics sintered at 900 °C showed the best comprehensive performance, εr = 6.8, Q × f = 15,800 GHz, τf = −54.2 ppm/°C. These promising properties make the composite more suitable for practical application.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
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2019
·
IF 3.78
Wenzong Xu,Xiaoling Wang,Xiongjie Wu,Wu Li,Chuanming Cheng
Fire safety is very important in the application of epoxy resin (EP). To study the effect of fire safety, a new kind of double-modified graphene (F-RGO-CuMoO 4 ) was synthesized in this work. Firstly, GO was modified with 3-Triethoxysilylpropylamine (KH550) through the amidation reaction between the amino and carboxyl group to obtain organic functionalized graphene F-RGO. Subsequently, CuMoO 4 was introduced onto the surface of F-RGO by the electrostatic interaction . Then the prepared F-RGO-CuMoO 4 was added into EP to prepare an EP composite. The TEM test results of the EP/F-RGO-CuMoO 4 ultrathin section showed that F-RGO-CuMoO 4 was well dispersed in EP, indicating that the dispersion of graphene in EP was obviously improved after double modification. In addition, F-RGO-CuMoO 4 also effectively improved the fire safety of EP. Specifically, the total heat release (THR), peak heat release rate (PHRR), total smoke production (TSP) and smoke production rate (SPR) values of the EP/F-RGO-CuMoO 4 composite were reduced to 33.4 MJ/m 2 , 504 kW/m 2 , 24.5 m 2 and 0.27 m 2 /s, which were 43.7%, 59.9%, 62.3% and 66.7% lower than those of pure EP, respectively. The main fire safety mechanism of F-RGO-CuMoO 4 was explored according to the char residue analysis.
研究领域:
材料科学
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火灾安全工程
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Jia Guo,Hang Li,Qian Ma,Qi Zhang,Yi Wang,Xueying Wang
The construction of tunable oxygen vacancies on the surface of materials has become an emerging approach to develop excellent gas sensitivity, in spite of the critical need for the influencing mechanism. In this paper, novel MoO 3 /CuMoO 4 self-assembled microspheres with superior gas-sensing performance to triethylamine (TEA) have been fabricated by a simple solvothermal route. The introduction of Cu 2+ plays a key role for the surface defects and morphological evolution of MoO 3 -based composites. The sensors based on MoO 3 /CuMoO 4 microspheres exhibit an optimal response of 240.1 toward 100 ppm TEA with fast response and recovery time (45/15 s) at a low operating temperature of 300 °C, together with the low detection limit of 500 ppb, good long-term stability and reliability, and remarkable selectivity for TEA. Actually, abundant oxygen vacancies as active sites greatly contribute to the increasing surface chemisorbed oxygen. The enhanced gas-sensing mechanism can be mainly ascribed from the combination of the formation of MoO 3 -CuMoO 4 heterojunctions , surface oxygen vacancies, and the self-assembled microstructure for the improved electron transfer behavior. The present work provides a new insight into the design of surface oxygen vacancies actuated gas sensors with unique surface/interface reactive process and transport mechanism.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）