INORGANICA CHIMICA ACTA
·
2020
·
IF 2.304
Ping-Ping Sun,Yu-Hang Zhang,Xuehua Yu,Qi Shi,Bo Tian,Jun Gao,Fa-Nian Shi
A new 3-dimensional (3D) Mn-based metal organic framework (Mn-MOF) was created through hydrothermal method. This Mn-MOF has the molecular formula of C 10 H 10 Mn 3 N 4 O 12 and possesses orthorhombic symmetry in the Pbcn space group. As the electrode material for supercapacitors, a small amount of Cu powder is added to modify the electrode material (Mn-MOF-Cu), which has higher specific capacitance, better cycle stability and longer cycle life than the Mn-MOF. The specific capacitance of the optimized electrode material can reach 1606 F g −1 at 0.5 A g −1 , which is significantly higher than the original Mn-MOF electrode material (1106 F g −1 ). The key aspect which improves the electrochemical behavior of Mn-MOF-Cu is the introduction of Cu powder as a conductive additive, so that the advantages of the unique 3D structure of the Mn-MOF in terms of electron transport can be better displayed.
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高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Mengfan Liang,Qiang Lei,Shuhong Sun,Yan Zhu
In this article, the effect of the distinctiveness and arrangements on the plasmonic resonance of Cu–Ag system were studied by finite element method , and the effect of morphologies on the plasmonic properties of Cu@Ag core@shell NPs and Cu–Ag corn-cob liked NPs was investigated by experiment. For Cu@Ag core-shell structure, as the fixed thickness of Ag-shell at 10 nm, the dipole plasmon resonance gradually blue-shifts with increasing the radius of Cu core, and as the fixed radius of Cu-core at 50 nm, the feature peak shows a red-shift and broadening with increasing the thickness of Ag shell. For Cu–Ag corn-cob structure, the feature for different Ag coverage are similar to each other and most of the them follow the blue-shifted tendency with the increase the degree of Ag-coverage. Furthermore, as the regular-shaped structure increases (form trigonal to spherical), the plasmon resonance gradually blue shifts, and finally, we use two parameters to describe the different idealized Cu–Ag structure: separation, exterior contact, intersection and core@shell. The combined information from our simulation and experiment will give guidelines for choosing adequate particles when aiming at certain plasmonic properties.
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高影响因子
Journal of Materials Research and Technology-JMR&T
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2020
·
IF 5.289
Wei Wang,Yaping Liu,Gang Wang,Caiwang Tan,Wei Cao
In this study, the carbon fiber reinforced ZrB 2 -SiC composite ceramic was joined to Ti6Al4V alloy with Ag-Cu eutectic alloy filler at varied holding time and a fixed temperature of 800℃. Interface microstructure and shear strength of brazing joints were studied. The brazed ZSC f ceramics/AgCu/TC4 alloy is endowed with good metallurgical bondings. A typical interfacial structure of joints brazed for 10 min was found as ZSC f /TiC/Ti 5 Si 3 /Ag(s,s)/Cu(s,s) + TiC/TiCu/Ti 2 Cu/(TiC + TiCu)/TC4 alloy. Increase of holding time did not vary the precipitated phase of the joints but decreased thickness of the Ag(s, s) and Cu(s, s) reaction layer and gradually thickened the Ti-Cu reaction layer near the TC4 side. The formation process of reaction products was discussed in detail. The holding time substantially influenced shear strength of the joints. A maximum shear strength of 39 MPa was reached at a brazing time of 20 min.
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高影响因子
IONICS
·
2020
·Vol. 26
·期 8
·4193-4200
·
IF 2.394
Zheng Li,Sun Wu-juan
A 3D metal-organic framework (Cu 4.5 (BTZE) 1.5 (OH) 4 (SO 4 )(H 2 O) 1.5 ∙4H 2 O) n (BTZE is 1,2-bis(tetrazol-5-yl) ethane anion) modified carbon paste electrode (Cu-BTZE/CPE) has been fabricated for hydrazine sensing. The Cu-BTZE framework was prepared through a facile solvo-thermal method and characterized by Fourier-transform infrared spectrometry, X-ray diffraction, and scanning electron microscopy. Meanwhile, the electrochemical performances of the modified electrode were studied by electrochemical impedance spectroscopy, chronocoulometry, cyclic voltammetry, and amperometry. Owing to the large electrochemically active surface area and enhanced electron transfer efficiency of Cu-BTZE framework, the Cu-BTZE/CPE showed enhanced electrocatalytic activity toward the oxidation of hydrazine compared with unmodified CPE. Under the optimized conditions, the amperometric current presented linear dependence on the concentration of hydrazine in the ranges of 0.02~1.2 μM and 1.2~500 μM, respectively. The detection limit was 6 nM, lower than the reported Cu-based hydrazine sensors. Furthermore, the sensor has applied for the determination of hydrazine in water samples.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Hong Du,Xiuyun Ma,Miao Jiang,Peifang Yan,Z. Conrad Zhang
The production of furfuryl alcohol from furfural hydrogenation in gas phase is of great significance for the valorization of biomass. The existing catalyst for this transformation suffers from high cost and complex preparation process. Thus, a highly efficient copper catalyst was developed by a simple impregnation method using ethanolamine modified granular silica as carrier. The catalytic performance was related to the amount of ethanolamine used in modification. Highly dispersed copper with uniform particle size distribution was obtained from appropriate amount of ethanolamine modified granular silica. The ethanolamine modified granular silica (mass ratio between ethanolamine and silica was 3 in the initial modification mixture) supported copper catalyst exhibited the best performance in terms of catalyst lifetime thanks to its maximum amount of Cu 0 sites and largest amount of Cu + sites. A slow deactivation of the catalyst after extended time on stream evaluation is attributed to carbon deposition and slow copper sintering.
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高影响因子
COMPUTERS AND ELECTRONICS IN AGRICULTURE
·
2023
·
IF 8.3
Qiaolin Liu,Hui Wang,Jiangtao Ji,Wenxuan Zhang,Anqi Wang,Bo Zhao,Zhi Chen
Cadmium ions (Cd 2+ ) are one of the highly poisonous heavy metal ions in the environment, but at present, the detection of Cd 2+ on the market has the disadvantages of complex operation, high detection cost and slow detection speed, so it is urgent to develop rapid and sensitive detection platforms for detecting Cd 2+ . In this study, a novel electrochemical sensor (g-C 3 N 4 /CuNps) was successfully fabricated. g-C 3 N 4 /CuNps composite has a large and unique surface area that is beneficial to the adsorption and preconcentration of Cd 2+ . The experiment parameters such as deposition potential, deposition time, pH of supporting electrolyte, supporting electrolyte, the amount of g-C 3 N 4 /CuNps being coated on the GCE, were optimized. Under the optimized conditions, the electrochemical performances of g-C 3 N 4 /CuNps composites modified sensor have been investigated, which shows excellent wider linear range and lower detection limit (0.098 nM). The linear ranges of Cd 2+ detections were 1-100µgL -1 . Moreover, the sensor shows desirable stability, selectivity, and reproducibility for detecting Cd 2+ . For real water samples, the sensor has a satisfactory recovery rate, indicating that the sensor could be successfully applied in the determination of Cd 2+ in environmental water. Therefore, the designed sensor provides a potential simple and low cost material for electrochemical detection of Cd 2+ .
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Hui Gao,Gong Zhang,Dongfang Cheng,Yongtao Wang,Jing Zhao,Xiaozhi Li,Xiaowei Du,Zhi-Jian Zhao,Tuo Wang,Peng Zhang,Jinlong Gong
Electrochemical CO 2 reduction is a sustainable method for producing multicarbon alcohols. However, the selectivity of alcohols is limited owing to the favorable side reaction to convert the key intermediate of *CH 2 CHO into ethylene. This study describes the design of a Cu electrocatalyst with abundant step sites to suppress the deoxygenation of *CH 2 CHO to ethylene, thereby promoting alcohol production. A Faradic efficiency of 40.5% and partial current density of 56.3 mA/cm 2 for alcohols are achieved. Moreover, the alcohols/C 2 H 4 ratio in the products reaches approximately 2.2. In-situ infrared spectrum characterizations and theoretical calculations reveal that the step sites facilitate C–C coupling and direct the reaction pathway to promote the formation of alcohols by inhibiting the cleavage of the C–O bond in *CH 2 CHO. Therefore, the proposed strategy is efficient for designing active sites to steer reaction pathways in CO 2 electroreductions and produce alcohols.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 42
·e2312091120
·
IF 11.1
Xia Lin,Junwei Zhang,Huihui Yan,Jiaxi Xu,Zhonghao Miao,Guangchang Shu,Shuyuan Zhao,Tianyuan Zhang,Haoxiang Yu,Lei Yan,Liyuan Zhang,Jie Shu
Metal-sulfur batteries have received great attention for electrochemical energy storage due to high theoretical capacity and low cost, but their further development is impeded by low sulfur utilization, poor electrochemical kinetics, and serious shuttle effect of the sulfur cathode. To avoid these problems, herein, a triple-synergistic small-molecule sulfur cathode is designed by employing N, S co-doped hierarchical porous bamboo charcoal as a sulfur host in an aqueous Cu-S battery. Expect the enhanced conductivity and chemisorption induced by N, S synergistic co-doping, the intrinsic synergy of macro-/meso-/microporous triple structure also ensures space-confined small-molecule sulfur as high utilization reactant and effectively alleviates the volume expansion during conversion reaction. Under a further joint synergy between hierarchical structure and heteroatom doping, the resulting sulfur cathode endows the Cu-S battery with outstanding electrochemical performance. Cycled at 5 A g−1, it can deliver a high reversible capacity of 2,509.8 mAh g−1 with a good capacity retention of 97.9% after 800 cycles. In addition, a flexible hybrid pouch cell built by a small-molecule sulfur cathode, Zn anode, and gel electrolytes can firmly deliver high average operating voltage of about 1.3 V with a reversible capacity of over 2,500 mAh g−1 under various destructive conditions, suggesting that the triple-synergistic small-molecule sulfur cathode promises energetic metal-sulfur batteries.
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PubMed
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Yang Xiang,Zan Liu,Zhilin Cheng
Herein, we successfully constructed a Cu+-doped PVA-derived mesoporous carbon@diatomite (DE) composite by virtue of N2-suffered carbonization and self-reduction at a high temperature. The structure and composition of C/Cu@DE composite adsorbents were determined by a series of characterizations. The results affirmed that Cu+ species are highly scattered in PVA-derived mesoporous carbon, which covered the DE surface. The effect of carbonization temperature on the structure and composition of the C/Cu@DE composite adsorbents were intensively investigated, indicating that the C/Cu@DE composite at an 800 °C carbonization temperature (C/Cu@DE-800 °C) showed the formation of many Cu+ species and preferable hierarchical pore properties. The adsorption experiments of benzothiophene (BT) indicated that C/Cu@DE-800 °C possessed a better adsorption capacity. The adsorption behavior of BT onto C/Cu@DE-800 °C was investigated by a variety of adsorption times, initial concentrations, and recycle times, of which the largest adsorption capacity for BT attained 34.2 mg/g. Furthermore, the adsorption kinetics, intraparticle diffusion, adsorption isotherms, and adsorption thermodynamics of BT onto C/Cu@DE-800 °C was deeply studied, which contributed to the proposed adsorption mechanism.
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 17
·2478
·
IF 5.3
Ning Wang,Yuanyuan Zhao,Xuelian Wu,Dapeng Li,Ruguang Ma,Zhigang Chen,Zhengying Wu
In this study, a Cu NPs-incorporated carbon-containing mesoporous SiO2(Cu/C-SiO2) was successfully synthesized through a grinding-assisted self-infiltration method followed by an in situ reduction process. The obtained Cu/C-SiO2was then employed as a Fenton-like catalyst to remove tetracycline (TC) from aqueous solutions. TEM, EDS, XRD, N2adsorption–desorption, FTIR, and XPS methods were used to characterize the crystal structure, morphology, porosity, chemical composition, and surface chemical properties of the catalyst. The effects of initial TC concentration, catalyst dosage, H2O2dosage, solution pH, HA addition, and water media on the TC degradation over Cu/C-SiO2were investigated. Scavenging and electrochemical experiments were then carried out to analyze the TC degradation mechanism. The results show that the Cu/C-SiO2can remove 99.9% of the concentrated TC solution (C0= 500 mg·L−1), and it can be used in a wide pH range (R.E.= 94–99%, pH = 3.0–11.0). Moreover, hydroxyl radicals (•OH) were detected to be the dominant reactive species in this catalytic system. This study provides a simple and promising method for the synthesis of heteroatom-containing mesoporous catalysts for the decomposition of antibiotics in wastewater.Keywords:Cu nanoparticles;mesoporous silica;Fenton-like catalyst;tetracycline
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高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Yongqi Yan,Xinyu Yang,Ping Ning,Chi Wang,Xin Sun,Fei Wang,Peng Gao,Kai Li
In this study, non-thermal plasma (NTP) was employed to modify the Cu/TiO 2 adsorbent to efficiently purify H 2 S in low-temperature and micro-oxygen environments. The effects of Cu loading amounts and atmospheres of NTP treatment on the adsorption-oxidation performance of the adsorbents were investigated. The NTP modification successfully boosted the H 2 S removal capacity to varying degrees, and the optimized adsorbent treated by air plasma (Cu/TiO 2 -Air) attained the best H 2 S breakthrough capacity of 113.29 mg H 2 S/g adsorbent , which was almost 5 times higher than that of the adsorbent without NTP modification. Further studies demonstrated that the superior performance of Cu/TiO 2 -Air was attributed to increased mesoporous volume, more exposure of active sites (CuO) and functional groups (amino groups and hydroxyl groups), enhanced Ti-O-Cu interaction, and the favorable ratio of active oxygen species. Additionally, the X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results indicated the main reason for the deactivation was the consumption of the active components (CuO) and the agglomeration of reaction products (CuS and SO 4 2− ) occupying the active sites on the surface and the inner pores of the adsorbents.
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Advanced Energy Materials
·
2023
·Vol. 13
·期 42
·2302692
·
IF 27.8
Qingyu Wang,Yida Zhang,Minxi Lin,Hengwei Wang,Yu Bai,Chengyuan Liu,Junling Lu,Qiquan Luo,Gongming Wang,Hai-Long Jiang,Tao Yao,Xusheng Zheng
Metastable structures are promising candidates for efficient catalysis owing to abundant active electronic states, strong electronic coupling with reactants, and energetic preference. Exerting the value of metastable structures while evading the difficulty in direct synthesis remains challenging. Herein, it is reported that light irradiation enables the generation and maintenance of the metastable state over copper single atoms for efficient carbon dioxide reduction. Under irradiation with light, photogenerated electrons transit to Cu-3 d orbits and initiate d -orbital rearrangement. The initial symmetric Cu 1 ─O 4 coordination converts to the metastable asymmetric structure of Cu 1 ─O 2+1 , and is reversibly restored after removing the light. The photoinduced metastable intermediate of Cu 1 ─O 2+1 promotes the Cu single-atom catalyst to deliver an ethylene yield rate of 60.4 µmol g cat. −1 h −1 . Mechanistic studies reveal that Cu 1 ─O 2+1 possesses stronger adsorption capability for reactants and intermediates. The reaction energy barrier over Cu 1 ─O 2+1 also shows an obvious decline compared to that over Cu 1 ─O 4 .
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