Chemistry-An Asian Journal
·
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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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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高影响因子
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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ChemistrySelect
·
2023
·Vol. 8
·期 19
·e202300624
·
IF 2.1
Yaxin Chen,Xiaohua Cai,Yuxia Sun,Minxing Du,Jiaojiao Zhao,Yuehui Li
Cerium and boron are commonly used components to tune the acidic/basic property of catalysts in industry. In this work, cerium or boron-doped copper-based catalysts (xM−Cu/SiO 2 , M=Ce/B) were prepared with the ammonia-evaporation method. Both X-ray diffraction and Auger electron spectroscopy revealed that Cu + content increased along with the Ce-doping, but decreased by B-doping. NH 3 -Temperature Program Desorption results showed no change in the acidity of Ce-doped catalysts, while significant amounts of medium-strong acid sites appeared after B-doping. Application in ethylene carbonate hydrogenation indicates the promoting role of Ce-dopant in methanol production, while boron exhibits negative effects. The significant difference can be attributed to distinctive acidic/basic properties of Ce/B dopants, which affect the interaction between Cu and Si in the precursors, and thus adjust the ratio of Cu + /(Cu + +Cu 0 ). Graphical Ce promotes the interaction between copper and silicate, regulating the ratio of Cu + /(Cu + +Cu 0 ), and prompting the selectivity of methanol. On the contrary, B weakens the interaction and leads to poor catalytic performance.
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高影响因子
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 POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2013
·Vol. 51
·期 6
·1468-1474
·
IF 3.543
Yun-Hai Yu,Xiao-Hui Liu,Di Jia,Bo-Wen Cheng,Fei-Jun Zhang,Hui-Na Li,Peng Chen,Shan Xie
Zn(0)/ppm concentrations of CuBr 2 from 10 to 50 ppm was firstly used to catalyze radical polymerization of acrylonitrile at ambient temperature. The polymerization displayed typical living radical polymerization (LRP) characteristics, as evidenced by pseudo first-order kinetics of polymerization, linear increase of number-average molecular weight, and low polydispersity index (PDI) value. Effects of solvent, copper concentration, and initiator concentration on the polymerization reaction and molecular weight as well as PDI were investigated in detail. EC excelled NMP, DMF, and DMSO in terms of rate of polymerization as well as control of molecular weight and PDI. The increase of the copper concentration from 2.5 to 50 ppm leads to a higher rate of polymerization and a better control over the polymerization reaction. 1 H NMR and GPC analyses as well as chain extension reaction confirmed the very high chain-end functionality of the resultant polymer. © 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
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高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Yong Tang,Yongqi Zeng,Chunyu Wang,Zhi Wang,Danning Zhao,Chuang Du,Fengxi Li,Lei Wang
The enzymatic Diels–Alder reaction presents an environmentally appealing strategy for synthesizing chiral norbornene scaffolds. In this study, an artificial Diels–Alderase was constructed by incorporating a biotinylated Cu-phenanthroline cofactor (5-NH2Phen-biotin*Cu(NO3)2) into streptavidin and optimizing the enzyme through genetic engineering. The S112D variant of this artificial Diels–Alderase exhibited commendable catalytic performance, facilitating highly enantio- and regioselective Diels–Alder reactions. Employing this method, we synthesized a series of norbornene pyridones with broad substrate scopes and good functional group tolerance under mild conditions, achieving high yields along with good enantio- and regioselectivities. Molecular dynamics (MD) simulations provided insights into the critical complex intermediates involved in the proposed reaction mechanism and clarified the interactions between the Diels–Alderase and its substrates, revealing the structural basis for the generation of the predominant norbornenepyridone conformation and the enhanced selectivity observed with the S112D mutant. Furthermore, quantum mechanics/molecular mechanics (QM/MM) calculations analyzed the reaction energy barriers of possible transition states, elucidating the reason for the formation of the target product from an energetic perspective.
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PHYSICA SCRIPTA
·
2025
·Vol. 100
·期 10
·105607
·
IF 2.6
Xiaolong Song,Yafang Pan,Shi Wang,Peng Wang,Mingli Wang
Compared with single-metal materials, bimetallic materials exhibit superior oxidation resistance and stability. The Surface-enhanced Raman Scattering (SERS) performance can be effectively modulated by adjusting the concentration of the precursors. Herein, Fe3O4@EDTA@Ag-Cu NPs were successfully synthesized, the SERS performance of the substrate was significantly enhanced by modulating the concentration of the silver and copper precursors. The results indicated that the SERS sample prepared by mixing the dispersion of Fe3O4@EDTA@Ag-Cu NPs with Rhodamine 6G(R6G) solution at a 1:2 volume ratio, achieved a detection concentration as low as (1.0 ± 0.2) × 10−10 M for R6G. Furthermore, the substrate demonstrated high sensitivity, uniformity, temporal stability, reproducibility, and the capability for the rapid detection of benzimidazole in strongly alkaline conditions.
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高影响因子
Materials Today Bio
·
2025
·
IF 10.2
Han Shi,Zhiqiang Xie,Junrong Zhang,Fengchun Lu,Haoteng Luo,Pengfei Guo,Meichen Jiang,Zongqi Weng,Xin Luo,Bing Chen,Heguang Huang,Tianhong Teng
Reprogramming of branched-chain amino acid (BCAA) metabolism is a key mechanism promoting pancreatic cancer progression. While gabapentin (Gp) can inhibit BCAA catabolism by targeting branched-chain amino acid aminotransferase 1 (BCAT1), its efficacy is limited by inefficient delivery and compensatory mitochondrial metabolism. To address this, we developed a novel copper ionophore-functionalized mesoporous silica nanoplatform (XQ/Gp@CMSNs) for synergistic cuproptosis and tumor-starvation therapy. The designed nanoparticles exhibit excellent pancreatic cancer-targeting capability via XQ-2d aptamer modification and acid-responsive drug release within the tumor microenvironment. Upon internalization, XQ/Gp@CMSNs simultaneously induce mitochondrial copper overload and disrupt BCAA metabolism, leading to dihydrolipoamide S-acetyltransferase (DLAT) oligomerization, ferredoxin 1 (FDX1) downregulation, and tricarboxylic acid (TCA) cycle suppression. Both in vitro and in vivo studies demonstrated potent antitumor efficacy with minimal systemic toxicity. Metabolomic analyses further confirmed synergistic BCAA metabolic inhibition and copper-induced mitochondrial dysfunction. This work presents a promising metabolic intervention strategy for pancreatic cancer through targeted nanomedicine.
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DOI
PubMed
高影响因子
WEAR
·
2026
·
IF 7.2
Qingke Yu,Weisheng Zheng,Jiangtao Yu,Yan Lou,Pan Guo,Guijian Huang,Mingyu Liu
Micro moulds are widely used in the fabrication of micro/nano structures, where wear resistance is critical. This study presents a mixed phosphonic acid self-assembled monolayers (SAMs)-modified Zr-Cu-Al-Ni bulk metallic glass (BMG), which not only retains hydrophobic properties but also demonstrates exceptional high-temperature tribological performance. The wear behavior and mechanisms were systematically studied in the range from room temperature (RT) to 250 °C. Tribological tests were conducted using a multifunctional friction and wear tester in a ball-on-disk configuration, with polyetheretherketone (PEEK) balls as the counterface material against both bare and SAMs-modified Zr-based BMG specimens. The evolution of wear mechanisms in the PEEK-SAMs-modified BMG tribosystem at different temperatures was analyzed, particularly focusing on the coupled effects of the PEEK glass transition temperature and the melting and decomposition temperatures of SAMs on the tribosystem. Results demonstrate that the wear rate of Zr-Cu-Al-Ni BMG exhibits a progressive decrease within the RT to 140 °C range, declining from 53.26 × 10 −6 mm 3 N −1 m −1 to 0.156 × 10 −6 mm 3 N −1 m −1 .At RT, abrasive and minor oxidative wear dominate. Between 90 °C and 140 °C, molten SAMs films provide stable lubrication, with the friction coefficient dropping to 0.004 at 110 °C, indicating full lubrication, while maintaining hydrophobicity. At 150 °C, exceeding the glass transition temperature of the ball material (PEEK), the ball softens and increases the wear rate to 0.324 × 10 −6 mm 3 N −1 m −1 . The wear mechanism in this stage is still dominated by oxidative wear due to high temperature. Interestingly, at 200-250 °C, the friction coefficient follows a different trend, initially increasing, then decreasing, and stabilising after 800-1000 s. At stabilization, the friction coefficient matches that of unmodified BMG, while the wear rate rises to 17.205 × 10 −6 mm 3 N −1 m −1 , attributed to the thermal decomposition of SAMs and lubrication film failure. sam softening promotes adhesive wear and becomes the dominant mechanism. Meanwhile, interfacial property analysis systematically reveals the temperature-dependent effects on the chemical bonding, molecular ordering, and adsorption density of SAMs, elucidating their collective impact on wear evolution. This study demonstrates the exceptional wear resistance of SAMs-modified Zr-Cu-Al-Ni BMG, particularly at 110 °C, and further reveals that molecular interface engineering provides a novel design strategy for high-temperature wear-resistant metallic systems beyond conventional bulk strengthening approaches.
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高影响因子
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