INORGANICA CHIMICA ACTA
·
2017
·
IF 2.002
Xin Li,Dandan Zhang,Zihui Liu,Ying Xu,Dongfeng Wang
Organophosphorus pesticides are a class of the most important groups of insecticides and are widely applied to pest and plant diseases control in agriculture. The extensive application of organophosphorus pesticides can subsequently release organophosphorus pesticides into environment which may pose a seriously adverse impact to non-target organisms and humans. However, we could not ban organophosphorus pesticides at present as they are very efficient. Therefore, the new technique of degradation of organophosphorus pesticides must be studied. In this paper, a ternary copper Schiff base complex 2Cu(C 14 H 8 NO 3 Cl)(C 12 H 8 N 2 )·3CH 3 OH was synthesized and characterised by physico-chemical and spectroscopic methods. The degraded effects of 4 pesticides by the complex were investigated. The results showed that the degraded rates of every organophosphorus pesticide were increased. However, the effects of degradation were varied because of the different molecule structures of organophosphorus pesticides. Gas chromatography-mass spectrometry (GC–MS) and ion chromatography were used to analyze the degradation products by the complex, and then the catalytic mechanism of degradation was proposed. The study results suggest that the Schiff base copper complex, as a potent catalyzer, may find its applications in catalytic degradation area.
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ChemCatChem
·
2020
·Vol. 12
·期 6
·1639-1646
·
IF 4.853
Pan Li,Jianzhi Wang,Ning Cai,Lei Wang,Jing Tong,Faquan Yu
Graphical The center of attention : The CuO x @CoO nanorods grown on Cu Foam with the hierarchical configuration and the heterojunction interfaces enjoyed a couple of advantages of self-supported electrodes: needing no glue as an electrode, avoiding the agglomeration of MOFs-based particles, and forming the outward active figuration and large specific surface area. Those features lead to superior OER performances. The fabrication of cost-effective and performance-advanced electrocatalysts is in great requirements for water splitting to achieve sustainable oxygen production. A simple and effective precursor of ZIF-67 particles mounted on Cu(OH) 2 nanorods was induced by a template alignment method. After annealing, hierarchical CoO polyhedron-decorated CuO/Cu 2 O (CuO x ) nanorods on Cu foam (denoted as CuO x @CoO NRs/CF) were achieved, which displayed the heterojunction in CuO x components, hierarchical configuration and outward active sites. These features, verified by HRTEM, SEM, XPS and EDX, optimized the oxygen evolution reaction (OER) electrocatalyst. Benefiting from its large electrochemical surface area and the synergetic effect between CuO x and CoO, CuO x @CoO NRs/CF exhibited considerable catalytic activity with a low overpotential of 254 mV to obtain a current density of 10 mA cm −2 in alkaline electrolyte and a scarce loss of the initial catalyst activity over 24 h and over 5000 cycles. This work provides a channel to enhance the performance in OER.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Dejin Zang,Qi Li,Guoyong Dai,Mengyan Zeng,Yichao Huang,Yongge Wei
Electrocatalytic CO 2 reduction reaction (CO 2 RR) is a promising pathway for storage of renewable electricity and converting CO 2 into value-added products. It`s highly desired to obtain acetic acid via CO 2 RR since it`s an important chemical feedstock and high energy-density liquid fuel. However, developing highly efficient electrocatalysts for selective CO 2 RR toward acetate remains formidable challenge. We report an interface engineering strategy to modify copper nanocubes with polyoxometalate (POM) to generate Cu–O–Mo interface as active sites for CO 2 RR, achieving state-of-the-art activity with 48.68% acetate formation Faradaic efficiency and current density of ∼110 mA cm −2 at -1.13 V vs RHE. DFT calculations suggest the interface of Cu planes and polyoxometalate clusters with abundant Cu–O–Mo active sites promote the generation of *CH 3 and successive coupling with CO 2 insertion, showing a potential dependence of acetate production. This work provides a Cu–O–Mo interface model for the rational design of earth-abundant metal based electrocatalysts for CO 2 RR and other renewable energy conversions.
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FUEL
·
2022
·
IF 8.035
Kaige Li,Tao Li,Yuhang Dai,Yanhong Quan,Jinxian Zhao,Jun Ren
MCo 2 O 4 (M = Co, Cu, Ni or Zn) spinel catalysts have been prepared using a chemical co-precipitation method and applied in toluene combustion. The physicochemical properties of the MCo 2 O 4 catalysts was discussed to explore the impact of substitution on the tetrahedral A-site ions. The results of the activity evaluation show that the catalytic performances of Co 3 O 4 , CuCo 2 O 4 and NiCo 2 O 4 with urchin-like morphology are far superior than ZnCo 2 O 4 nanoparticles. The CuCo 2 O 4 catalyst exhibited the most superior performance for toluene combustion, and the toluene conversion rate reached 90% at 230 °C. When compared to the other catalysts, the optimal activity of CuCo 2 O 4 was attributed to the presence of more reactive oxygen species, a higher concentration of Co 3+ ions on catalyst surface and better reducibility at relative lower temperature. Moreover, the catalytic activity of the CuCo 2 O 4 catalyst did not decrease significantly in the long-term test, demonstrating its excellent stability.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Fei Wang,Dongzheng Wu,Yichao Zhuang,Jialin Li,Xianzhen Nie,Jing Zeng,Jinbao Zhao
The nature of dendrite-free magnesium (Mg) metal anodes is an important advantage in rechargeable magnesium batteries (RMBs). However, this traditional cognition needs to be reconsidered due to inhomogeneous Mg deposits under extreme electrochemical conditions. Herein, we report a three-dimensional (3D) Cu-based host with magnesiophilic Ag sites (denoted as “Ag@3D Cu mesh”) to regulate Mg deposition behaviors and achieve uniform Mg electrodeposition. Mg deposition/stripping behaviors are obviously improved under the cooperative effect of nanowire structures and Ag sites. The test results indicate that nucleation overpotentials are reduced distinctly and cycling performances are prolonged, suggesting that the general rules of 3D structures and affinity sites improve the durability and reversibility of Mg deposition/stripping. Besides, a unique concave surface structure can induce Mg to deposit into the interior of the interspace, which utilizes Mg more efficiently and leads to improved electrochemical performances with limited Mg content. Furthermore, in situ optical microscopic images show that the Ag@3D Cu mesh can attain a smooth surface, nearly without Mg protrusions, under 8.0 mA cm–2, which prevents premature short circuits. This report is a pioneering work to demonstrate the feasibility of modification of Cu-based current collectors and the necessity of functional current collectors to improve the possibility of practical applications for RMBs.
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JOURNAL OF PHYSICAL CHEMISTRY A
·
2010
·
IF 2.899
Shengtong Sun,Peiyi Wu
A designed ligand-accelerated Cu(I)-catalyzed cycloaddition (CuAAC) reaction was monitored for the first time by real time infrared analysis technique based on ATR-FTIR principles. Principal components analysis (PCA) and two-dimensional correlation spectroscopy (2Dcos) results showed that the consumption of alkyne and azide took place successively followed by the formation of the product 1,2,3-triazole, and a 1:1 complex of two reactants would be formed in the reaction process. The rate-determining step of the CuAAC reaction was also experimentally confirmed for the first time to be the transition of azide−alkyne 1:1 complex to the preproduct 1,2,3-triazole. Our results are in good conformity with the current catalytic mechanism proposed by Sharpless et al. according to DFT calculation results.
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 9
·3970-3983
·
IF 3.5
Liu Sisi,Deng Yuxing,Jiang Shengqiang,Liu Jingang
Poly (2-methacryloyloxyethyl phosphorylcholine) (PMPC), as a highly hydrophilic as well as biocompatible material, has been widely used in biomedical applications. In this study, the friction reduction and wear resistance of HXLPE were improved by grafting PMPC on its surface. However, the PMPC will be sheared off during friction, which is difficult to meet the long-term service requirements of artificial joints. This can be achieved by improving the lubrication environment to minimize PMPC shedding. To simulate the human lubrication environment, free PMPC (lubrication factor) and Cu 2+ (transition group metal ion catalyst) were added to neonatal bovine serum (NBCS). When the friction pair consisting of grafted PMPC-modified HXLPE and Cu/ZrO 2 ceramics is rubbed therein, the grafted PMPC interacts with the free PMPC, while Cu 2+ catalyzes the oxidative hydrolysis of serum proteins into carbon-containing small molecules and adsorbs on the surface of the Cu/ZrO 2 ceramics to form a carbon-rich lubrication layer. The composite lubrication layer consisting of grafted-free PMPC and carbon-rich lubrication layer provides good load-bearing and lubrication properties at the friction interface. And the wear rate is reduced by 45% compared to rubbing in deionized water. This technique can reduce the shedding of grafted PMPC state and improve the load-bearing performance of the interfacial lubrication layer, thus reducing the wear of HXLPE and prolonging the service life of the artificial joint.
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Chemistry-An Asian Journal
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2021
·Vol. 16
·期 19
·2973-2977
·
IF 4.568
Jun Zhou,Sha Yang,Yesen Tan,Huaisheng Cheng,Jinsong Chai,Manzhou Zhu
The change in the valence state of nanocluster can induce remarkable changes in the properties and structure. However, achieving the valence state changes in nanoclusters is still a challenge. In this work, we use Cu 2+ as dopant to “oxidize” [Ag 62 S 12 (SBu t ) 32 ] 2+ (4 free electrons) to obtain the new nanocluster: [Ag 62−x Cu x S 12 (SBu t ) 32 ] 4+ with 2 free electrons. As revealed by its structure, the [Ag 62−x Cu x S 12 (SBu t ) 32 ] 4+ (x=10∼21) has a similar structure to that of [Ag 62 S 12 (SBu t ) 32 ] 2+ precursor and all the Cu atoms occupy the surface site of nanocluster. It′s worth noting that with the Cu atoms doping, the [Ag 62−x Cu x S 12 (SBu t ) 32 ] 4+ nanocluster is more stable than [Ag 62 S 12 (SBu t ) 32 ] 2+ at higher temperature and in electrochemical cycle. This result has laid a foundation for the subsequent application and exploration. Overall, this work reveals crystals structure of a new Ag−Cu nanocluster and offers a new insight into the electron reduction/oxidation of nanocluster.
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International Journal of Electrochemical Science
·
2023
·Vol. 12
·期 6
·5511-5520
·
IF 1.5
Xingpu Qi,Jianzhong Qian,Tong Chen,Daoli Lu,Bin Chen
With a chemical and eco-friendly in situ reduction technique, an excellent Ag-Pd bimetallic nanoparticle (Ag-Pd)-based hybrid was successfully synthesized in this study. To determine copper(II) ions in water, this work employed differential pulse adsorptive stripping voltammetry (DPAdSV) and preconcentration methods. Furthermore, the sensor feasibility was studied with river and tap water as real specimens. The results revealed the potential of the proposed electrochemical sensor to be applied for the early testing of water quality based on its desirable behavior in Cu(II) determination in real specimens.
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Energy Storage Materials
·
2018
·
IF 0
Wenhua Zhu,Wei Deng,Fei Zhao,Shanshan Liang,Xufeng Zhou,Zhaoping Liu
Metallic lithium anode has attracted immense attention for high energy density rechargeable batteries. However, the infinity volume change and safety issues caused by the uncontrollable growth of lithium dendrites during long-term cycling hinder its practical applications. Herein, we explore an effective strategy to solve these problems by building a secondary conductive graphene network inside the macropores of copper foam as a three-dimensional host to fabricate metallic lithium (CuFG@Li) anode. The graphene network, nested in the Cu foam, can further split the large pores of Cu foam to form micron-sized cages. After the molten lithium being infused inside the host, this graphene conductive network can be used as a deposition matrix for lithium metal in the pores and minimize the local size of lithium metal to enhance the reversibility of plating/stripping of lithium and maintain the constant volume of anode during the long cycles. The CuFG@Li anode displays stable cycling for more than 1300 h at a current density of 1 mA/cm 2 , and exhibits high Coulombic efficiency of 98% over 200 cycles at 1 mA/cm 2 , which is much better than bare Li foil anode. The CuFG@Li/LiFePO 4 full cell is also fabricated and displays excellent rate performance. This strategy presents a general approach to suppress the growth of lithium dendrites and regulate the volume changes for long-lifespan lithium metal batteries .
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Scientific Reports
·
2015
·Vol. 5
·期 1
·12005
·
IF 5.578
Cui Yan-Li,Guo Xiao-Ning,Wang Ying-Yong,Guo Xiang-Yun
N-aryl imidazoles play an important role as structural and functional units in many natural products and biologically active compounds. Herein, we report a photocatalytic route for the C-N cross-coupling reactions over a Cu/graphene catalyst, which can effectively catalyze N-arylation of imidazole and phenylboronic acid and achieve a turnover frequency of 25.4 h −1 at 25 o C and the irradiation of visible light. The enhanced catalytic activity of the Cu/graphene under the light irradiation results from the localized surface plasmon resonance of copper nanoparticles. The Cu/graphene photocatalyst has a general applicability for photocatalytic C-N, C-O and C-S cross-coupling of arylboronic acids with imidazoles, phenols and thiophenols. This study provides a green photocatalytic route for the production of N-aryl imidazoles.
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Xiaoyun Lin,Yongnian Ni,Serge Kokot
A novel 3D nano-flower-like Cu/multi-layer molybdenum disulfide composite (CuNFs/MoS 2 ) modified glassy carbon electrode (GCE) has been successfully constructed. It was a highly sensitive and selective non-enzymatic hydrogen peroxide (H 2 O 2 ) and glucose biosensor . The morphology of the obtained CuNFs-MoS 2 nano-particles was investigated with the use of a scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS). The physicochemical properties of the modified electrode were characterized at each of the construction stages with the use of an electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) techniques. The new sensor combined the advantages of MoS 2 and CuNFs , and exhibited high electro-catalytic activity toward H 2 O 2 and glucose. Quantitative analysis of H 2 O 2 and glucose was carried out with the use of the amperometric i – t method. Linear ranges were obtained between 0.04–1.88 μM and 1.88–35.6 μM for H 2 O 2 and 1–20 μM and 20–70 μM for glucose, and their corresponding limits of detection (LOD) were 0.021 μM and 0.32 μM. This novel sensor was successfully applied for the quantitative analysis of H 2 O 2 in tap water and glucose in human serum samples.
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