ACS Applied Nano Materials
·
2026
·
IF 5.8
Yunying Wang,Yanyan Yu,Ying He,Yun Liu
Single-atom iron catalysts have emerged as promising mimics of oxidases; however, strategies to enhance their intrinsic catalytic activity remain underexplored. Herein, waste pitch and eggshells are utilized for fabricating high-performance nanozymes by coloading nanocopper and iron single atoms onto nitrogen-doped carbon nanotubes (Fe/Cu@NCNTs). It has been demonstrated that copper nanoparticles serve as a critical modulator, electronically tuning the iron sites, which increases the Fe2+/Fe3+ ratio and promotes the formation of Fe–Cu nanoalloys. These synergistic effects significantly enhance the oxidase-like activity of the catalyst. The optimized Fe/Cu@NCNTs exhibit a 48.7% higher specific activity and superior substrate affinity compared with the Fe@NCNTs counterpart. Leveraging this enhanced catalytic performance, a smartphone-assisted colorimetric sensing platform was developed for the rapid visual detection of multiple analytes. Furthermore, by incorporating a three-channel sensor array (TMB, ABTS, and OPD) with pattern recognition analysis, the platform accurately discriminates between nine antioxidants at concentrations as low as 10 μM. This work not only provides valuable insight into the mechanistic role of copper in enhancing the oxidase-like activity of iron single-atom catalysts but also offers a versatile and high-throughput sensing platform that advances the application of nanozymes in complex sample analysis.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Wen-Gang Cui,Yan-Ting Li,Lei Yu,Hongbo Zhang,Tong-Liang Hu
Selective hydrogenation of CO2 to methanol is a “two birds, one stone” technology to mitigate the greenhouse effect and solve the energy demand–supply deficit. Cu-based catalysts can effectively catalyze this reaction but suffer from low catalytic stability caused by the sintering of Cu species. Here, we report a series of zeolite-fixed catalysts Cu/ZnOx(Y)@Na-ZSM-5 (Y is the mass ratios of Cu/Zn in the catalysts) with core–shell structures to overcome this issue and strengthen the transformation. Fascinatingly, in this work, we first employed bimetallic metal–organic framework, CuZn-HKUST-1, nanoparticles (NPs) as a sacrificial agent to introduce ultrasmall Cu/ZnOx NPs (∼2 nm) into the crystalline particles of the Na-ZSM-5 zeolite via a hydrothermal synthesis method. The catalytic results showed that the optimized zeolite-encapsulated Cu/ZnOx(1.38)@Na-ZSM-5 catalyst exhibited the space time yield of methanol (STYMeOH) of 44.88 gMeOH·gCu–1·h–1, much more efficient than the supported Cu/ZnOx/Na-ZSM-5 catalyst (13.32 gMeOH·gCu–1·h–1) and industrial Cu/ZnO/Al2O3 catalyst (8.46 gMeOH·gCu–1·h–1) under identical conditions. Multiple studies demonstrated that the confinement in the zeolite formwork affords an intimate surrounding for the active phase to create synergies and avoid the separation of Cu–ZnOx interfaces, which results in an improved performance. More importantly, in the long-term test, the Cu/ZnOx(1.38)@Na-ZSM-5 catalyst exhibited constant STYMeOH with superior durability benefitted from its fixed structure. The current findings demonstrate the importance of confinement effects in designing highly efficient and stable methanol synthesis catalysts.
研究领域:
化学工程
·
材料科学
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 15
·A3539
·
IF 3.12
Handong Jiao,Shuqiang Jiao,Wei-Li Song,Haosen Chen,Mingyong Wang,Jiguo Tu,Daining Fang
Rechargeable Al-ion batteries have attracted great interest due to their advantages in high anode capacity, high safety, etc. However, conventional Al foil negative electrode has critical problems in corrosion and pulverization. Here, we propose a novel Cu-Al composite, which is prepared by a facile electrochemical plating approach, as the negative electrode for addressing above challenges. Remarkably, the plated Cu foil negative electrode delivers excellent stability and long cycle life compared with the Al foil negative electrode, although its thickness and areal mass density are only 30% and ∼76% of that of the Al foil negative electrode, respectively. The essential pulverization problem in bare Al negative electrode would be dramatically reduced attributing to excellent corrosion resistance of Cu foil. Besides, the plated Al is still attached to the Cu foil during repeated charge-discharge processes, resulting in a nearly 100% Coulombic efficiency even after long-term cycling. More importantly, the plated Cu foil negative electrode is convenient for the large-scale practical applications. In view of our results, this work opens an effective approach for configuring low-cost, high energy density, long cycle life and scalable negative electrode of Al-ion batteries.
研究领域:
材料科学
·
电化学
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MATERIALS CHARACTERIZATION
·
2023
·
IF 4.7
Zhichao Yang,Dehui Zheng,Zhen Wang,Tingbin Liang,Shuangbao Wang
Twin-jet electropolishing (TJE) is a well-known method to prepare Cu-containing Al alloys for transmission electron microscopy (TEM) observation. Previous studies have reported a Cu-rich layer usually formed between Al matrix and outermost alumina layer at the electropolished Al surface. However, characteristics and formation mechanisms of the Cu-rich layer remain largely unexplored. Herein, configurations, formation process and property of the Cu-rich layer formed during TJE of Al alloys are revealed detailly employing aberration-corrected scanning TEM (STEM), STEM image simulations and first-principles calculations. The results reveal a new orientation relationship between the Cu-rich layer (θ’-Al 2 Cu) and Al matrix, which produces a low interfacial Al strain field. Formations of ∼2-nm-thick θ’ layer and its beneath ∼6-nm-thick Cu diffusion zone at the electropolished Cu-containing Al surface are mainly associated with traces of Cu in the electrolyte and anodization. Selective oxidation of elements, Cu-emitting alumina layer and spontaneous solute Cu segregation at the Al surface are also responsible for formations of the θ’ layer and Cu diffusion zone. Further study reveals that the θ’ layer behaves a strong self-healing ability after damaged by high-energy electron beam. The obtained results provide a potential insight into the surface modification of metals and alloys using electrochemical method.
研究领域:
材料科学
·
电化学
·
显微分析
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2021
·Vol. 46
·期 10
·1598-1610
·
IF 1.887
Xiaoxia Ma,Xi Chen,Yuxiang Li,Zhiqiang Qiao,Guangcheng Yang,Kaili Zhang
The afterburning effect of aluminized explosives makes them have strong damage ability to soft targets, but the aluminum particles in the composition often cannot achieve proper combustion. The high ignition temperature of micron aluminum powder is one of the main reasons. In this work, we introduce nanothermite reaction with low onset temperature (<660 °C) into aluminized explosives by replacing the base explosives with energetic coordination polymers (ECPs). The decomposition products of many ECPs contain corresponding metal oxides that will react with aluminum via thermite reaction. Three kinds of ECPs ([CoC 2 H 4 N 8 O 4 ] n , [NiC 2 H 4 N 8 O 4 ] n and [CuC 2 H 4 N 8 O 4 ] n ) are constructed and compounded with nano-aluminum (nano-Al) particles to form aluminized ECPs. The influence of metal ion species and Al/Metal (Al/Me) molar ratio on their energetic properties are systematically studied. The results show that the exothermic thermite reaction with low onset temperature plays an important role in the combustion propagation of aluminized ECPs, and the possible mechanism is proposed. When the Al/Me molar ratio is 3–4, the aluminized ECPs have the best peak pressure and pressurization rate. At the optimum molar ratio, the pressure and pressurization rate of aluminized ECP(Co) are much higher than those of aluminized ECP(Ni) and ECP(Cu). Among the three kinds of aluminized ECPs, the aluminized ECP(Co) has the best energetic characteristics and can be used as a preferred choice. However, for the applications that require a long-time heat supply, aluminized ECP(Cu) will be suitable.
研究领域:
材料科学
·
化学工程
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Materials Today Chemistry
·
2026
·
IF 7.4
Haiqun Jin,Hongjie Tong,Chenxuan Mei,Haiping Lin,Kun Chen,Pu Wu
Cu/Zn-MOF nanozyme exhibits robust triple-enzyme activities. • It promotes healing by combining antibacterial, antioxidant, and pro-proliferative effects. • This work provides a strategy for designing multifunctional nanoenzyme platform for efficient wound therapy. The treatment of infected wounds is severely challenged by bacterial resistance and dysregulated healing processes. Herein, we report a bimetallic Cu/Zn-MOF nanozyme fabricated via a facile self-assembly strategy. The material exhibits robust triple-enzyme mimetic activity (superoxide dismutase (SOD), glutathione peroxidase (GPx), and ascorbate peroxidase (APx)) enabling efficient reactive oxygen species (ROS) scavenging to alleviate oxidative stress and inflammation. In vitro, Cu/Zn-MOF demonstrated potent, broad-spectrum antibacterial activity, primarily associated with disruption of bacterial nucleotide metabolism and energy homeostasis, while also promoting fibroblast proliferation and migration. In an infectious wound model, Cu/Zn-MOF treatment significantly accelerated wound closure, enhanced collagen deposition, and facilitated orderly tissue regeneration, achieving a healing rate of 93.4% by day 12. This work presents a versatile nanozyme platform that intelligently orchestrates the sequential stages of wound healing, offering a promising multi-functional strategy for regenerative medicine.
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CHINESE JOURNAL OF CHEMISTRY
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2026
·
IF 5.7
Huabin Lian,Lin Zheng,Enwei Wang,Shuai Wang,Rongyao Wang,Daowei Gao,Riming Hu,Chunsheng Li,Guozhu Chen
Comprehensive Summary Nanostructured island-confined metal catalysts offer remarkable stability; however, it is challenge to balance the activity and selectivity in multi-step reactions owing to the limited electronic modifications for individual metal systems. Here, we develop a strategy by integrating “nano-island confinement” with “dilute alloying”, in which ~0.7 nm Pt 95 Cu 5 dilute alloy clusters are confined onto CeO ₓ nano-islands. As expected, this confinement not only suppresses metal migration and leaching, but also tailors the surface electronic structure via strong Pt-Cu coupling to regulate substrate adsorption and activation. Various characterizations reveal that the as-designed catalytic system maintains abundant active sites because of the nearly full exposure of Pt, and more importantly, downshifts the Pt d-band center through d-d hybridization within Pt-Cu dilute alloy. As a result, this configuration optimizes furfural adsorption behavior, and favors its planar adsorption instead of vertical one. DFT calculation further shows that planar-adsorption-driven hydrogenation remarkably enhances the reaction kinetics by reducing the barrier for FurCH₂O formation and accelerating proton-coupled electron transfer step. Compared with nano-island confined Pt catalyst, the confined Pt-Cu dilute alloy increases the TOF for furfural conversion from 849.3 to 1008.7 h –1 and for furfuryl alcohol from 383.9 to 657.7 h –1 , and demonstrates remarkable stability under demanding conditions (150 °C, 3 MPa H 2 ). These results demonstrate that the nano-islands confined dilute alloy strategy is promising for effectively maintaining metal stability and adjusting activity-selectivity balance.
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CHEMICAL ENGINEERING SCIENCE
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2026
·
IF 5.1
Jie Gao,Shaoqing Yu,Xiaojun Deng,Jingyu Ran,Chuan Ma,Yunlin Shao,Lei Tang,Xin Huang
CO 2 hydrogenation to methanol is severely constrained by thermodynamic equilibrium limitations and rapid catalyst deactivation at elevated temperatures. To address these challenges, a novel strategy integrating dielectric barrier discharge (DBD) non-thermal plasma (NTP) with Cu-Ce-Zr solid solution catalysts was adopted for low-temperature methanol synthesis. A series of Cu-Ce 1-x Zr x O 2 (x = 0.2–0.8) catalysts with varying Zr/Ce ratios were synthesized to systematically investigate the regulatory mechanism of lattice defects on the plasma-catalytic performance and the potential synergy between the plasma and catalyst. Characterization results revealed that an optimal Zr content (x = 0.6) maximized the surface oxygen vacancy concentration, generating abundant Ce 3+ -O v -Zr 4+ sites and stabilizing highly dispersed active Cu species. At near-ambient temperature and atmospheric pressure with optimal discharge parameters (30 kV, 9 kHz), the plasma-assisted Cu-Ce 0.4 Zr 0.6 O 2 system achieved CO 2 conversion of 20.5 % with methanol selectivity of 50.6 %, corresponding to methanol space–time yield of 148.4 mg·g cat -1 ·h −1 . A strong synergy was observed between the plasma and the Cu-Ce 0.4 Zr 0.6 O 2 catalyst. The plasma efficiently activated gas-phase molecules, while the catalyst regulated the hydrogenation pathway to promote CH 3 OH formation and suppress side reactions. Compared to the plasma-alone mode, the energy consumption for methanol production was reduced by 81.5 %, and the system exhibited excellent stability over 24 h of continuous operation. This work provides insights into the rational design of catalysts for application in NTP-catalytic systems.
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Micromachines
·
2018
·Vol. 9
·期 12
·678
·
IF 2.222
Pinhua Zhang,Haoming Sun,Wenhui Guan,Jinjin Liang,Xiaomeng Zhu,Junkai Zhang,Min Chen,Meng Cao,Wenbing Qian,Kefu Gao,Guangliang Cui
The nanostructures with uniform long-range ordered structure are of crucial importance for performance standardization of high-quality surface-enhanced Raman scattering (SERS) spectra. In this paper, we described the fabrication and SERS properties of Au decorated Cu (Au@Cu) nanoarrays. The Cu nanoarrays with uniform long-range ordered structure were first synthesized by in-situ electrochemistry assembly on insulated substrate. The Cu nanoarrays can reach a size of centimeters with strictly periodic nano-microstructure, which is beneficial for the production and performance standardization of SERS substrates. Then Au nanoparticals were decorated on the Cu nanoarrays by galvanic reaction without any capping agent. The obtained Au@Cu nanoarrays exhibit excellent SERS activity for 4-Mercaptopyridine, and the sensitivity limit is as low as 10−8M. Therefore, this facile route provides a useful platform for the fabrication of SERS substrates based on nano ordered arrays.
研究领域:
纳米材料
·
表面科学
·
分析化学
·
等离激元学
·
传感器
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SURFACE & COATINGS TECHNOLOGY
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2011
·
IF 2.141
Qiang Chen,Dun-qiang Tan,Rui Liu,Wen-xian Li
Electrodepositing Al coatings on W 90 Cu 10 foils in AlCl 3 + LiAlH 4 Tetrahydrofuran–benzene electrolyte was reported in this work. Effects of variations in molar ratios of AlCl 3 /LiAlH 4 , current density and plating time on surface morphology and crystal orientations were studied, and the optimal values of three parameters were preliminarily gained. Results showed that Al coatings displayed dense and cone-shaped micro-crystallites, and the particle size of coatings increased obviously with increasing current density or decreasing the proportion of AlCl 3 . It was indicated that all of the electrodeposits exhibited a strong preferred (111), (220) crystal orientation, and the (220) crystal orientation became strong along with electroplating time and current density, but weak with the proportion of AlCl 3 in baths. On the contrary, the changes of the (111) orientation exhibited an opposite trend.
研究领域:
材料科学
·
电化学
·
表面工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Guo-Feng Qiu,Yu-Tian Zhang,Miao-Miao Shi,Fei-Fei Zhang,Xue-Feng Sun,Zhe Meng,Bo Bi,Yi-Chen Guo,Quan-Qing Li,Jun-Min Yan
Ammonia (NH 3 ) is one of the important chemicals in human society. Conversion of air and water to NH 3 by plasma treatment and electrocatalytic reduction is a prospective approach. Herein, a self-supported CuCo/Cu nanowires (NWs) catalyst is prepared through simple electrochemical methods, achieving exceptional eNO x - RR performance: 99.8% Faradaic efficiency and 230.3 mg h -1 cm -2 NH 3 yield rate at -0.7 V vs. RHE in 1 M NaOH with 0.2 M NO x - . The 3D NWs architecture provides abundant exposed active sites, significantly improving the catalyst's NO x - reduction activity. Besides, the introduction of Co modulates the electronic structure of Cu while serving as a complementary site for active hydrogen (*H) supply, thereby synergistically promoting the eNO x - RR process. Finally, CuCo/Cu NWs serve as a bifunctional catalyst coupled with the anodic hydrazine oxidation reaction (HzOR) instead of the oxygen evolution reaction (OER), effectively reducing the energy consumption of the eNO x - RR system and achieving a greener and energy conservation route for the synthesis of NH 3 .
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Coatings
·
2023
·Vol. 13
·期 2
·252
·
IF 3.4
Yunzhang Li,Meng Zhou,Yi Zhang,Hanjing Zhu,Xianhua Zheng,Shengli Liang,Shunlong Tang,Baohong Tian,Yong Liu,Xu Li,Alex A. Volinsky,Chenglin Zheng
With the massive penetration of electronics into human life, higher demands are placed on electrical contacts. Among them, the lifetime of electrical contacts and safety are the most concerning. In this research, Al2O3-Cu/25Mo5Ta and 0.5Y2O3/Al2O3-Cu/25Mo5Ta composites were prepared by using ball milling and powder metallurgy methods. The two composites were subjected to 10,000 contact opening and closing electrical contact experiments and the arc duration and arc energy were analyzed. The results show that the addition of Y2O3has a slight effect on the mechanical properties of the Al2O3-Cu/25Mo5Ta composites but has a significant effect on the electrical contact performance. Y2O3can reduce the mass loss of the electrical contacts during the electrical contact process, which prolongs their service life. The addition of Y2O3decreased the average arc duration and arc energy of the electrical contact material by 21.53% and 18.02%, respectively, under the experimental conditions of DC 30 V, 10 A. TEM results showed that nanoscale YTaO4with excellent thermal stability was generated during the sintering process, which has a positive effect on the electrical contact performance of the composites.Keywords:copper matrix composites;electrical contact;arc erosion behavior;yttrium tantalate
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