Surfaces and Interfaces
·
2021
·
IF 4.837
Sixun Niu,Xiaobin Dong,Weifen Zhang,Xiansong Li,Shiquan Liu
SiO 2 -Cu x O composites may have potential applications in antibacterial and dye degradation . However, it is still a challenge to prepare SiO 2 -Cu x O films with well crystallized Cu x O nanoparticles and high Cu/Si molar ratios under alkaline condition at relatively low temperature. Herein, by using PVP stabilized alkaline silica sol and ethanolic solution of copper acetate, a series of SiO 2 -Cu x O composite films with high Cu/Si molar ratios were successfully prepared via a facile two-step process of dip coating and annealing. The microstructure and crystalline phase of the composite films were finely controlled by changing the amount of PVP, the concentration of copper solution and the calcination temperature. The results showed that film prepared with 1 mol/L copper acetate solution and calcined at 500 °C exhibited the best antibacterial activity , adsorption and photocatalytic performance toward methylene blue in solutions. The prepared films could be conveniently used in antibacterial field and the treatment of organic wastewater.
研究领域:
材料科学
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环境科学
·
微生物学
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产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Lyu Shuai,Zhang Yuhua,Li Zhe,Liu Xinyue,Tian Zhenfang,Liu Chengchao,Li Jinlin,Wang Li
Metal-support interaction has been one of the main topics of research on supported catalysts all the time. However, many other factors including the particle size, shape and chemical composition can have significant influences on the catalytic performance when considering the role of metal-support interaction. Herein, we have designed a series of CuxO/ZnO catalysts as examples to quantitatively investigate how the metal-support interaction influences the catalytic performance. The electronic metal-support interactions between CuxO and ZnO were regulated successfully without altering the structure of CuxO/ZnO catalyst. Due to the lower work function of ZnO, electrons would transfer from ZnO to CuO, which is favorable for the formation of higher active Cu species. Combined experimental and theoretical calculations revealed that electron-rich interface result from interaction was favorable for the adsorption of oxygen and CO oxidation reaction. Such strategy represents a new direction to boost the catalytic activity of supported catalysts in various applications.
研究领域:
催化化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xue Xu,Huile Jin,Qian Ren,Aili Liu,Jun Li,Dewu Yin,Xin Feng,Xiaomei Dong,Jichang Wang,Shun Wang
The focus of this study is to explore ways of accelerating the corrosion rate of copper anodes for the possible synthesis of copper nano-composites on the counter electrode, and the subsequent applications of such composites as nonenzymatic glucose sensor. Normally, a strong corrosion resistance of copper anodes emerges in alkaline solutions due to the formation of a passive copper hydroxide film, which prevents further corrosion. In this research the presence of sulfide ions in the electrolyte was found to dramatically promote the corrosion process and eventually led to the production of CuxO/Cu2S (where CuxO was consist of Cu2O and CuO) nanocomposites on the counter electrode during the electrochemical corrosion process. When the as-prepared copper nanocomposites electrodes were used to detect the oxidation of glucose, a strongly enhanced anodic process was obtained, in which the detection limit was found to be around 10 uM with a linear range of 10-1000 uM and a detection sensitivity of 2688 uA cm -2 mM -1 .
研究领域:
材料科学
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分析化学
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生物医学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jiping Shi,Liuqing Hua,Lu Ruan,Xingjian Zhang,Zhengdao Li,Fengyun Su,Xin Li,Haiquan Xie,Yong Zhou
The ZnIn 2 S 4 nanosheets were successfully synthesized on the surface of compacted stainless steel mesh using a simple solvothermal method, and further modified with Cu x O nanoparticles to form ZnIn 2 S 4 /Cu x O heterojunction photocatalyst via a wet chemistry approach. These photocatalysts were then utilized for photothermal catalytic CO 2 reduction under full spectrum solar light. The experimental results demonstrated that the deposition of the photocatalyst on the flexible substrate effectively prevented the aggregation of ZnIn 2 S 4 nanosheets. The incorporation of Cu x O nanoparticles enhanced the specific surface area of the photocatalyst, and created a Z-scheme heterojunction with ZnIn 2 S 4 to improve the utilization efficiency of photogenerated electrons. It was noteworthy that the dark red Cu x O exhibited a full spectrum response and excellent photothermal effect, thereby facilitating carrier migration and reducing CO 2 catalytic reaction barriers. Consequently, the optimized ZnIn 2 S 4 /Cu x O exhibited significantly enhanced CO 2 to CO yield of 1515.8 μmol m -2 h −1 and CH 4 yield of 1579.4 μmol m -2 h −1 , which was about 7.5 and 7.6 times higher than those achieved by pure ZnIn 2 S 4 , respectively. Furthermore, this study provided detailed insights into the mechanism of photocatalytic CO 2 reduction over composite material as well as valuable guidance for designing immobilized photocatalysts with high activity for CO 2 reduction.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 50
·31619-31627
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IF 3.108
Yingqiao Xiang,Yingying Li,Xintong Zhang,Annan Zhou,Nan Jing,Qinghong Xu
A series of CuxO–TiO2 hollow nanospherical composites with different mass percents of copper were prepared by an impregnation method, and the TiO2 hollow nanospheres were prepared by hydrolysis of tetraethoxy titanium on the surface of spherical SiO2 nanoparticles and corrosion of SiO2 in NaOH solution. CuxO–TiO2 hollow nanospheres displayed higher photocatalytic activities towards acetaldehyde degradation to CO2 than TiO2@SiO2 nanospheres and TiO2 hollow nanospheres under UV and visible-light irradiation due to the narrowed band gap of TiO2 and enhanced charge separation after copper was introduced. In particular, the CuxO–TiO2 hollow nanospheres show high catalytic activities in degradation under visible-light irradiation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Analytical Methods
·
2015
·Vol. 8
·期 2
·316-325
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IF 1.821
Fugang Xu,Ying Liu,Shi Xie,Li Wang
In this study, a sensitive hydrazine sensor based on CuxO decorated three dimensional poly(3,4-ethylene-dioxythiophene) (3D-PEDOT) was developed. A 3D-PEDOT–CuxO hybrid was prepared through a facile electrochemical deposition and cyclic voltammetry treatment process. The hybrid material was characterized by scanning microscopy (SEM), X-ray energy dispersive spectroscopy (EDS), Raman, and electrochemical methods. It was found that 3D-PEDOT not only acts as a matrix to increase the loading amount of CuxO and enhances the conductivity, but also directly contributes to the catalytic oxidation of hydrazine. Owing to the synergistic interaction between 3D-PEDOT and CuxO, the 3D-PEDOT–CuxO hybrid displayed obviously enhanced catalysis for hydrazine oxidation with lower overpotential and stronger oxidation current compared to single component CuxO or 3D-PEDOT. The hydrazine sensor based on the 3D-PEDOT–CuxO hybrid exhibited a one order of magnitude wider linear range (0.5 μM to 53 mM), ten-fold lower detection limit (0.2 μM) and higher stability compared to those of the sensor based on CuxO. The proposed sensor was also used for the determination of hydrazine in real water samples with a satisfactory recovery.
研究领域:
材料科学
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分析化学
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电化学
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产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 94
·52067-52073
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IF 3.708
Xia Li,Changting Wei,Jinying Fu,Li Wang,Shouhui Chen,Ping Li,Hongbo Li,Yonghai Song
The CuxO micro/nanomaterials with various novel morphologies have been synthesized on the surface of copper foil by a simple electrochemical method. The morphology of the CuxO crystal could be controlled by adjusting the electrolyte solution. The structure and morphology of as-prepared CuxO micro/nanomaterials were determined by scanning electron microscopy, elemental analysis, X-ray photoelectron spectroscopy and X-ray powder diffraction. The formation mechanism of these CuxO micro/nanomaterials was discussed. The CuxO micro/nanomaterial electrodes showed good electrocatalytic activity toward glucose oxidation and the performance of nonenzymatic glucose sensors based on these CuxO micro/nanomaterials was investigated in detail. As a typical representative, the nonenzymatic glucose sensor based on the CuxONaClO4+CoCl2+SDS micro/nanomaterials showed a wide linear range of 0.025–9.05 mM and a low detection limit of 14.3 ± 0.6 μM. The green synthetic method of simply adjusting the electrolyte is not only suitable for synthesis of CuxO with various morphologies, but also provides an easy way to prepare other metal oxide with different morphologies for constructing nonenzymatic glucose sensors.
研究领域:
材料科学
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电化学
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传感器
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2014
·Vol. 17
·期 1
·563-574
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IF 4.198
Enyan Guo,Longwei Yin
We report on high-performance dye-sensitized solar cells (DSSCs) based on nitrogen doped anatase TiO2–CuxO core–shell mesoporous hybrids synthesized through a facile and controlled combined sol–gel and hydrothermal process in the presence of hexadecylamine as the structure-directing agent. The matching of band edges between CuxO and TiO2 to form a semiconductor heterojunction plays an important role in effective separation of light induced electrons and holes, providing a promising photoanode for DSSCs because of its wide absorption spectrum, high electron injection efficiency, and fast electron transference. DSSCs based on the mesoporous TiO2–CuxO core–shell hybrids show a high short-circuit current density of 9.60 mA cm−2 and a conversion efficiency of 3.86% under one sun illumination. While DSSCs based on the N-doped mesoporous TiO2–CuxO hybrids exhibit the higher short-circuit current density of 13.24 mA cm−2 and a conversion efficiency of 4.57% under one sun illumination. In comparison with un-doped TiO2–CuxO hybrids, the doping of nitrogen into the lattice of TiO2 can extend the light absorption in the ultraviolet range to the visible light region and effectively decrease the recombination rate of photo-generated electrons and holes. The presented N-doped mesoporous TiO2–CuxO hybrids as photoanodes could find potential applications for high performance DSSCs.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Kangfu Wang,Meiru Lv,Tian Zhou,Zehuan Zhang,Xingkun Liang,Huaying Liu,Huan Li,Xiaoning Tang
Bacterial infections pose a severe threat to human health and the living environment. Photodynamic antimicrobial strategies have attracted attention since they are not affected by the development of drug resistance by the organisms. Cuprous oxide (Cu 2 O) is a promising material for application in the photocatalytic antimicrobial field due to its excellent photo responsiveness. However, the fast recombination of photogenerated carriers and poor stability limit the application of Cu 2 O. This paper uses the advantages of the exceptional strength of copper oxide (CuO) and the photocatalytic potential of tungsten trioxide (WO 3 ) to design a photocatalytic antimicrobial WO 3 /Cu x O composite agent. The structure of the composite material reveals that CuO particles and WO 3 nanosheets are grown in-situ on octahedral Cu 2 O crystals, with the outermost layer primarily consisting of WO 3 . Simultaneously, the ternary composite structure utilizes interfacial interactions to regulate the electronic structure, which acts as the conduit for electron transfer. The killing effect of WO 3 /Cu x O on Escherichia coli ( E. coli ) after visible-light irradiation reaches 100.00%, which is 2.57 times higher than that of Cu 2 O and 34 times higher than that of WO 3 . The outstanding antimicrobial ability is attributed to the constructed stepped double Z-type heterojunction structure, which realizes multi-channel transfer of carriers and retains the carriers with superior redox capacity, increasing the quantum yield of reactive oxygen species (ROS). The ROS generated by photoexcitation of WO 3 /Cu x O is the main reason for the superior antibacterial performance. The detection results indicate that ROS oxidizes the bacterial physiological structure, resulting in noticeable depressions, wrinkles, and ruptures in Escherichia coli. Meanwhile, during the mixing and collision process between bacteria and the material, metal ions can denature protein structures, and the bacterial cell surface can be punctured or even torn. These factors collectively affect bacterial activity. This work provides effective ways and methods for designing efficient antimicrobial agents.
研究领域:
材料科学
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微生物学
·
光催化技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 30
·16470-16478
·
IF 12.732
Dan Xu,K. C. Chan,Hanjie Guo,Hong Zhong,Lin Lu
Electrochemical water splitting is an attractive strategy to realize hydrogen harvesting. Exploring highly efficient electrocatalysts based on non-precious materials is of great significance to break the dilemma of using noble metal-based materials for large-scale commercial hydrogen production. Currently, studies on nano-structured non-precious electrocatalysts mainly focus on improving the catalytic efficiency and durability. However, conventional methods to synthesize these materials are generally time-consuming and complex, which badly hinder the progress for large-scale applications. Herein, in this study, an ultrasmall-sized CuxO nanoparticle immobilized on porous laser-induced forward transfer (LIFT) graphene dispersed on Ni foam was successfully fabricated via a fast one-step laser deposition method. This fabricated composite exhibited an impressive performance towards the hydrogen evolution reaction (HER) in 1 M KOH solution. A low overpotential of 149.6 mV was achieved to reach an area current density of 10 mA cm−2, and a Tafel slope of 157 mV dec−1 was obtained. A 10 h chronoamperometry test of the as-prepared electrode under a fixed potential showed an ignorable degradation of the HER activity. This study shows the great potential of a facile preparation method of a highly efficient and inexpensive electrocatalyst for scalable hydrogen production.
研究领域:
材料科学
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电化学
·
能源技术
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Dun Fu,Tonni Agustiono Kurniawan,Herong Gui,Heng Li,Songbao Feng,Qingbiao Li,Yuanpeng Wang
This study investigated the effects of pyrolysis temperature on the physicochemical properties of pyrolyzed hydrochars (PHCs) and H2O2-catalyzed tetracycline (TC) degradation in a combined treatment with PHC and CuxO@PHCs. The effects of pH on TC degradation by CuxO@PHCs were also evaluated in the presence of H2O2 and compared with that by CuxO@GAC. To analyze their physicochemical changes due to the oxidant, the carbocatalysts were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) analysis, and Fourier transform infrared (FTIR) spectroscopy. To sustain its cost-effectiveness, spent CuxO@PHC700 was regenerated using NaOH. Based on the characterization results, increasing the pyrolysis temperature from 300 to 700 °C enlarged their specific surface area and pore volume. The X-ray diffraction (XRD) analysis revealed that the Cu anchored in the carbocatalyst existed as Cu2O/CuO. The H2O2-catalyzed degradation by CuxO@PHC700 (0.231 min–1) was faster than that by CuxO@PHC500 (0.107 min–1), CuxO@PHC300 (0.013 min–1), and CuxO@GAC (0.041 min–1) (p ≤ 0.05; analysis of variance (ANOVA)). The maximum TC removal was achieved by CuxO@PHC700 at pH 6 due to the H-bonding and Cu-bridging effects between the Cu-loaded carbocatalyst and TC molecules in solutions. Treated effluents could meet the maximum discharge limit standard of 1 mg/L set by the local legislation. After the first regeneration, the spent CuxO@PHC700 could attain about 96% of TC degradation. This implies that the saturated carbocatalyst still had promising catalytic activity for reuse. Overall, CuxO@PHC is a cost-effective option for TC removal from contaminated water.
研究领域:
环境科学
·
化学工程
·
废水处理
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Hongchun Mu,Jie Bai,Chunping Li,Weiyan Sun
Carbon nanofibers supported the vanadium and copper bimetallic oxide composite electrode material has been developed successfully in this study, as the outstanding electrode materials in supercapacitors . In electrospunning and calcination processes, the organic salt of vanadium underwent high temperature decomposition to form V 2 O 5 in situ. The various ratios of Cu x O-V 2 O 5 /CNFs composite electrode material were used to apply in the electrochemical performance testing through the vacuum impregnation method. Because of the copper doping, Cu x O-V 2 O 5 /CNFs (10:1) composites exhibited a specific capacitance of 867.2 F g −1 at 0.5 A g −1 over a potential range of 0–0.51 V, which surpassed those of their individual counterparts (682.5 F g −1 and 507.1 F g −1 at 0.5 A g −1 for V 2 O 5 /CNFs and CuCl 2 /CNF, respectively). The addition of trace copper oxide greatly improves the electrochemical performance of vanadium-based carbon fibers composites. The composites also showed good cycling stability due to the unique structure of the V 2 O 5 and synergies with copper oxide. The preparation route provided a novel strategy to synthesize composites of transition bimetallic oxide with improving electrochemical performance for applications in supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 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）