ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Bala Ismail Adamu,Attia Falak,Yi Tian,Xinghua Tan,Xiangmin Meng,Peipei Chen,Hanfu Wang,Weiguo Chu
High sensitivity, low limit of detection (LOD), and short response and recovery times at room temperature (RT) are critical for gas sensors. For NO2, different binary metal oxide-based sensors were developed to achieve superior performance at elevated temperatures instead of RT. Herein, we report on CuO@CuO and Cu3Mo2O9@CuO sensors with CuO and Cu3Mo2O9 micro/nanorods vertically aligned on the CuO layers, which were directly fabricated using a facile, low-cost, and catalyst-free chemical vapor deposition (CVD) technique. Their sensing performance tests revealed that the Cu3Mo2O9@CuO p–p heterojunction sensors exhibited a high response of 160% to 5 ppm NO2, an excellent sensitivity of 50% ppm–1, a low LOD of 2.30 ppb, a short response time of 49 s, and a rapid recovery of 241 s at RT, obviously better than those for CuO@CuO sensors. The superior performance of Cu3Mo2O9@CuO sensors could be attributed to the Schottky heterojunction formed between p-Cu3Mo2O9 micro/nanorods and p-CuO films, the catalytic effect, and the anisotropic nature of Cu3Mo2O9 micro/nanorods. This study not only provides a simple, low-cost, and batchable fabrication method of homo/heterojunction sensors with micro/nanorods vertically aligned on films but also opens an avenue for sensor design by tuning the Schottky barrier height to enhance RT performance.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-13
·
IF 12.264
Pan Zhengbin,Han Ershuan,Zheng Jingui,Lu Jing,Wang Xiaolin,Yin Yanbin,Waterhouse Geoffrey I. N.,Wang Xiuguo,Li Peiqiang
Flower-like CeO 2 nanoparticles enhance the performance of CuO nanoparticle/Cu.
The system benefits from the heterojunction between p-type CuO and n-type CeO 2 .
The selective reduction of CO 2 to methanol on the target catalyst is studied.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 2
·027515
·
IF 3.1
Xinqin Zhang,Rui Cao,Zehua Chen,Liling Zhou,Peipei Li,Hui Zhang,Ju Wu
Chloramphenicol (CAP), a broad-spectrum antibiotic, has severely impacted human health and the ecological environment, which brings an increasing demand for an efficient monitoring technology for rapid and sensitive antibiotic residue detection. Herein, a highly sensitive and selective electrochemical sensor was developed for detecting CAP, based on the synergistic effect of β-cyclodextrin (β-CD) and CuO-nanomaterials modifying glassy carbon electrode (GCE). Scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD) spectrometry were used for morphological characterization. β-CD/CuO/GCE sensor with high-specific surface area and cavity structure was prepared by modifying GCE for further electrochemical testing. Experimental parameters were optimized using square wave stripping voltammetry. The developed sensor obtains an ultra-wide linear range from 1.0 × 10−7 mol l−1 to 5.0 × 10−4 mol l−1and the limit of detection is 0.5 × 10−7 mol l−1. The sensor displays high sensitivity, remarkable stability, and reproducibility; particularly more convenient than the Liquid chromatography-mass spectrometry (LC-MS) verification method. Furthermore, the applicability of the developed β-CD/CuO/GCE sensor was demonstrated by detecting CAP in food samples.
研究领域:
分析化学
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食品安全
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环境科学
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产品关联
DOI
高影响因子
Frontiers in Energy Research
·
2022
·
IF 3.858
Ye Xiaodong,Jiang Yangyang,Chen Xi,Guo Benshuai,Mao Songbai,Guo Yafei,Zhao Chuanwen
Electrochemical CO2 reduction to CO using copper-based catalysts has been recognized a promising approach to realizing anthropologic carbon cycle. However, copper-based catalysts face the challenges of low reduction activity and poor selectivity in CO2 reduction reaction. Tuning particle size and oxygen vacancy represents an efficient strategy for boosting their activity and selectivity. Herein, we reported the preparation of nanostructured CuO catalysts for selective electrochemical CO2 reduction to CO. Several templates were employed in the template-assisted hydrothermal process to regulate the particle size and oxygen vacancy. Structure-property-activity relationships of the CuO nanostructures depend on the template effect. CuO-PVP and CuO-SDS synthesized using polyvinylpyrrolidone (PVP) and sodium dodecyl sulfate (SDS) as templates exhibited smaller particles sizes and higher concentrations of oxygen vacancy defects. Under the applied potential of −0.93 V vs. RHE, the desired CuO-PVP and CuO-SDS catalysts exhibited good CO2 reduction activity with high electrochemical surface area normalized partial current density of 2.21 and 1.37 mA/cm2 for CO production and outstanding CO selectivity with high faradaic efficiencies of 48.2 and 50.5%. Density functional theory (DFT) calculations indicated that oxygen vacancies in the CuO nanostructures not only promoted CO2 adsorption and activation but facilitated CO desorption from the catalyst surface, and therefore boosted the activity and CO selectivity in CO2 reduction. The results have deepened the understanding of the structure-property-activity relationships of CuO catalysts, and these will provide guidance for designing highly efficient and robust catalysts for electrochemical CO2 reduction to CO.
研究领域:
材料科学
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电化学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yufeng Wu,Shiyang Feng,Kui Yang,Wenjian Yang,Chao Li,Xuejun Cui,Jinxing Ma
Electrochemical ammonia synthesis via nitrate reduction reaction (NO 3 RR) offers a sustainable solution for mitigating nitrate pollution while recovering valuable nitrogen resources. Conventional flow-by/batch systems suffer from slow kinetics and low current efficiency due to a thick boundary layer at the electrode surface, which impairs NO 3 RR activity and selectivity. This study introduces a novel flow-through configuration employing a micron-porous CuO-Co 3 O 4 composite membrane electrode for enhanced NO 3 RR. Computational fluid dynamics simulations revealed a significantly thinner boundary layer (∼10 μm) in the flow-through mode compared to flow-by (>120 μm). Consequently, the flow-through mode exhibited a seven-fold increase in NO 3 RR kinetics, boosting the ammonia Faradaic efficiency (FE) from 7.2 % to 79.8 %. Optimization of the Co 3 O 4 membrane electrode, addressing parameters of Cu/Co loading and pore size, further enhanced performance. This achieved high ammonia selectivity and FE (up to 95.7 % and 88.1 %, respectively) across a broad nitrate concentration range (0.02–1.0 g N L −1 ). Mechanistic investigations, integrating scavenger-quenching experiments, electrochemical analyses, and electron paramagnetic resonance spectroscopy demonstrated that ammonia synthesis primarily followed the dominance of the direct electron transfer (DET) between the flow-through cathode and nitrate/nitrite, while hydrogen species (H*) served an auxiliary function. These results underscore the effectiveness of the flow-through membrane electrode configuration in facilitating efficient electrochemical ammonia synthesis, offering valuable insights for the advancement of electrochemical technologies for pollution control and resource recovery.
研究领域:
环境科学
·
电化学工程
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Yu Xie,Yunhui Yu,Limin Lu,Xue Ma,Lei Gong,Xigen Huang,Guangbin Liu,Yongfang Yu
In this work, a copper oxide nanoparticles (CuO-NPs) electro-catalyst was prepared on three-dimensional graphene (3DGR) and used as non-enzymatic sensing platform for malathion detection. The structural and morphological properties of the CuO-NPs/3DGR nanocomposite were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). 3DGR framework with pleated structures provided a large surface area for high dispersion of the CuO-NPs. The obtained CuO-NPs/3DGR nanocomposite was noted to possess high affinity towards malathion, and thus the redox reaction of CuO could be hindered. This feature was utilized to design as a simple strategy for electrochemical detection of malathion. The experimental parameters including accumulation time, pH value of buffer solution, and the volume of modified composite were optimized. Under optimal conditions, the CuO-NPs/3DGR modified electrode could detect malathion down to 0.01 nM on the basis of the suppressed signal measurements. The high sensitivity can be ascribed to the fact that the 3DGR worked as high-surface-area substrate to anchor CuO-NPs and provided excellent conductive pathways to promote electron transfer. Furthermore, for the determination of malathion in real samples, the sensor showed good recovery, stability, and selectivity.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2024
·
IF 4.4
Xiaojing Song,Libin Yang,Xinyu Chang,Songsong Miao,Hao Zhang
The Na LTA zeolite confined CuO catalyst CuO@Na LTA was prepared via the method of ligand protected in situ with Cu 2+ -glycine complex as Cu source, and characterized by multiple characteristic techniques. The results revealed that CuO nanoparticles were highly dispersed on Na LTA zeolite, and the catalytic properties of CuO@Na LTA were investigated in the alkene epoxidation with H 2 O 2 as oxidant in dioxane. For styrene oxidation, catalyst CuO@Na LTA exhibited excellent catalytic activities with 83 % conversion and 63 % selectivity to styrene epoxide, and could be easily recycled several times without obvious activity loss. The excellent catalytic activities could be attributed to the highly dispersed active CuO species. Besides, multiple electronic effects and coordinative interactions exited in Cu ion and the Si-Al zeolite skeleton framework played a key role in the catalytic recyclability.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 22
·2101179
·
IF 6.147
Tingting Meng,Jianhong Zhang,Huichao Wang,Nuo Fu,Mengpei Wang,Weishang Li,Ruixin Shi,Bo Peng,Peng Li,Ziwei Deng
The complex pollutants in wastewater including insoluble oils, organic dyes, and bacteria, have caused severe environmental problems, which are harmful to ecosystems and human health and are complex and difficult to achieve wastewater purification with one material or single procedure. Herein, a facile, yet environmentally benign strategy is proposed to fabricate a superhydrophilic/underwater superoleophobic CuO-coated mesh for all-in-one wastewater treatment. In this strategy, the hierarchical micro/nanostructured CuO-coated mesh is fabricated via an oxidation–dehydration process, which simultaneously endows the mesh with superwetting ability, remarkable photocatalytic degradation ability, and excellent photodynamic antibacterial activity. This CuO-coated mesh first exhibits the special underwater superoleophobicity, superior durability, reusability, and high antifouling capability, which ensures its high separation efficiency for oil/water mixtures. Then, this CuO-coated mesh is underwater superoleophobic, possessing the remarkable photocatalytic degradation performance of organic dye contaminates in water and excellent photodynamic antibacterial activities against Escherichia coli and Staphylococcus aureus under visible-light irradiation. As such, it plays a multi-role in wastewater remedy, significantly simplifying the implementation and saving the cost in practice. This work suggests a promising approach for the design of multi-functional materials in environmental remedies.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
COMBUSTION AND FLAME
·
2021
·
IF 4.185
Kaiwen Shi,Xiaode Guo,Ling Chen,Shanshan Huang,Linlin Zhao,Jie Ji,Xiang Zhou
Metastable intermolecular composites (MICs), also called nanothermites, are attracting wide attention mainly due to the increased interfacial contact area of the fuels and oxidants therein. In this study, an alcohol-thermal technique is adopted to synthesize approximately core-shell structured Al@CuO MICs, in which process copper acetate is used as the precursor of CuO while Al powder with a wide size distribution (50 nm−5 µm in diameter) is used as cores. The energy-release characteristics of the materials are studied by performing thermal analysis, constant-volume combustion cell tests, and high-speed camera imaging of the combustion process . The results show that Al nanoparticles are surrounded by CuO nanoparticles that are with an average diameter of about 10 nm, while micron-sized Al particles are coated by a continuous layer of nanoplatelets that are assembled from CuO nanoparticles. Benefiting from the enhanced interfacial contact compared with that of ultrasonically mixed counterpart, Al@CuO shows a lower apparent activation energy of solid-state interfacial reaction, a higher light intensity, a shorter burning time, a larger pressure output, and a higher pressurization rate. It is also found that equivalent ratio has a great effect on the combustion process, and a slightly fuel-rich formulation is preferred in this study. The synthesis method developed in this study may also be adapted to the preparation of other core-shell structured MICs.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Yiqing Zeng,Weilong Rong,Shule Zhang,Yanan Wang,Qin Zhong
Ammonia selective catalytic reduction (NH 3 -SCR) technique for nitrogen oxide (NO x ) elimination of low temperature flue gas (<200 °C) requires huge energy consumption and operation costs. In this work, a CuO modified V 2 O 5 -WO 3 /TiO 2 (Cu/VWTi) catalyst are constructed to achieve the aim of enhancing the temperature of flue gas via using the heat released by CO oxidation, thereby promoting the NH 3 -SCR of NO x reaction. Benefiting from the synergistic effect between CuO and VWTi in the adsorption and activation of reactants, Cu/VWTi catalyst shows high NO x (>90%) and CO (>90%) removal efficiency at the temperature range of 225–270 °C and a GHSV of 40,000 h −1 . Moreover, it is found that the completely oxidation of 2000 ppm CO can increase the flue gas temperature by about 20 °C. Therefore, developing catalyst that can achieve simultaneously NH 3 -SCR of NO x and CO oxidation is a feasible method to deduce the energy consumption and operation costs of NH 3 -SCR of NO x system in low temperature flue gas. Finally, the reaction process and SO 2 deactivation effect over Cu/VWTi catalyst was studied via in-situ DRIFT. This work might provide some guidance for the design of catalysts to eliminate multiple pollutants.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
高影响因子
Science Bulletin
·
2023
·
IF 18.9
Ye Wang,Ming Xu,Xi Wang,Ruixiang Ge,Yu-Quan Zhu,An-Zhen Li,Hua Zhou,Fengen Chen,Lirong Zheng,Haohong Duan
Electrocatalytic oxidation of renewable biomass (such as glucose) into high-value-added chemicals provides an effective approach to achieving carbon neutrality. CuO-derived materials are among the most promising electrocatalysts for biomass electrooxidation , but the identification of their active sites under electrochemical conditions remains elusive. Herein, we report a potential-dependent structure evolution over CuO in the glucose oxidation reaction (GOR). Through systematic electrochemical and spectroscopic characterizations, we unveil that CuO undergoes Cu 2+ /Cu + and Cu 3+ /Cu 2+ redox processes at increased potentials with successive generation of Cu(OH) 2 and CuOOH as the active phases. In addition, these two structures have distinct activities in the GOR, with Cu(OH) 2 being favorable for aldehyde oxidation, and CuOOH showed faster kinetics in carbon–carbon cleavage and alcohol/aldehyde oxidation. This work deepens our understanding of the dynamic reconstruction of Cu-based catalysts under electrochemical conditions and may guide rational material design for biomass valorization.
研究领域:
电化学
·
催化
·
材料科学
·
可再生能源
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Bo He,Lixian Song,Zixuan Zhao,Weibao Liu,Yingtang Zhou,Jiangwei Shang,Xiuwen Cheng
In this study, we used the hydrothermal method and high-temperature calcination method to attach CuFe 2 O 4 to CuO for the first time. The (1 1 1) plane of CuO and (1 1 2) plane of CuFe 2 O 4 formed surface heterojunction, which acts as the interface for adsorbing PMS. Meanwhile, the most stable form of CuFe 2 O 4 /CuO, charge transfer and charge density in CuFe 2 O 4 /CuO/PMS system are proposed by combining density functional theory (DFT) and transmission electron microscope (TEM). The experimental data from electron spin resonance (ESR) determinations and active species capture demonstrated that both nonradical singlet oxygen ( 1 O 2 ) and active radicals (•OH, •SO 4 - ) participate in CIP degradation. The degradation pathways and the intermediates are proposed by Fukui index and liquid chromatography-mass spectrometry (LC-MS). Based on the T.E.S.T program (Toxicity Calculation Software), the bioaccumulation factor, acute toxicity, mutagenicity, and development toxicity of intermediates are proposed. Also, CuFe 2 O 4 /CuO demonstrated good reusability and stability. The findings within this work offered deep insights into the mechanisms of organic pollutants degradation via SR-AOP over Fe-Cu catalyst. Besides, verification of the experimental results indicated that the CIP removal of 86.67% and the mineralization efficiency of 47.17% under optimal conditions. Finally, chemical oxygen demand (COD) and fluorescence spectra in a three-dimensional excitation-emission matrix (3D EEMs) are used to characterize the potential performance of catalyst CuFe 2 O 4 /CuO-500 in medical wastewater.
研究领域:
环境科学
·
材料科学
·
计算化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）