Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Rongrong Dai,Bingyan Zhou,Jingwen Zeng,Pengle Qian,Yadong Sun,Yingtang Zhou,Zheng Guo
A dual-phase copper-doped iron oxide nanozyme (Cu-α/γFO) was synthesized via a facile hydrothermal method for efficient organic pollutant degradation. The as-prepared Cu-α/γFO exhibits excellent peroxidase-like activity, degrading 99.5% rhodamine B (RhB) under optimal conditions (pH 4, 40°C) while retaining 40.73% of its initial activity after three cycles. Critically, it demonstrates broad-spectrum catalytic efficacy, efficiently degrading diverse organic dyes (e.g., cresol red, methyl violet, methylene blue), and retains high catalytic activity even in complex environments containing coexisting cations (K⁺, Ca²⁺, Mg²⁺), anions (H₂PO₄⁻, HCO₃⁻, NO₃⁻), or organic solvents (acetone, ethyl acetate). X-ray diffraction (XRD) and Raman spectroscopy confirmed the Cu-doping-induced α/γ-Fe₂O₃ phase crystal structure, while minimal copper leaching after 21-day aqueous storage validated structural integrity. The mechanism of enhanced peroxidase-like activity of Cu-α/γFO was proposed based on integrated characterization, including electron spin resonance (ESR), electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), and density of states calculations. Degradation pathways were elucidated using high-performance liquid chromatography-mass spectrometry (HPLC-MS) identification of intermediates and theoretical calculations. This work presents a dual-phase engineering strategy through targeted metal doping, advancing high-performance nanozymes for sustainable environmental remediation.
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Nature Communications
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2025
·
IF 15.7
Yao Yuan,Zhang Xinyue,Cao Yingying,Liu Long,Zhang Yanqiang,Zhang Suojiang
Cyclopropane-based aerospace fuels exhibit the excellent volumetric calorific value, leading to broad application prospects in aircrafts. However, due to the highly rigid structure of the cyclopropane (compared to cyclobutane or cyclopentane, etc.) and the difficulty in forming metal-carbene intermediates, there are still significant challenges in the precise synthesis of multi-cyclopropane-based high-energy fuels ( ≥ 2 cyclopropane structures). Herein, via the introduction of bending strain on metal organic complex, we report a single-site Cu/single-walled carbon nanotube catalyst (Cu/SWCNT), which possesses 2.6-fold conversion (up to 77.4%) and 4-fold selectivity (up to 45.7%) as that without bending strain for the preparation of bi-cyclopropane-based fuels from dienes. XAFS and DFT calculations show that bending strain enhances the upward shift of d-band center of β electrons (−4.370 to −4.366), thus promotes the adsorption and activation of CH 2 N 2 and alkenes. Moreover, bending strain elongates Cu-O bonds (1.91 to 1.96 Å), making it easier for CH 2 N 2 to insert and form Fischer carbene intermediates. These two aspects obviously reduce the reaction energy barrier from 40.3 to 33.7 kcal·mol -1 for the cyclopropanation process. Our work provides a method of strain engineering to regulate C-C coupling reactions at the molecular level, and achieve highly efficient cyclopropanation from alkenes.
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Nanomaterials
·
2025
·Vol. 15
·期 23
·1777
·
IF 4.3
Haihong Zhao,Lei Li,Jiaxin Li,Feiqi Yan,Wenhao Wang,Mingxia Zhao
In this work, a novel mixed-component bimetallic metal–organic framework (MOF) composite material was synthesized via a solvothermal approach, and its structural and textural properties were systematically characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), N2adsorption/desorption analysis, and transmission electron microscopy (TEM). Furthermore, the single-component adsorption isotherms of CO2and N2were experimentally measured and fitted to the Langmuir–Freundlich model. The CO2/N2selectivity of the composite was evaluated based on the ideal adsorption solution theory (IAST). The results demonstrated that the addition of Zn2+significantly enhanced the specific surface area and improved the CO2adsorption capacity (3.97 mmol/g at 35 °C and 1 bar), with an increase of 31.5% in comparison with the Cu-BTC/MCFs (3.02 mmol/g). Meanwhile, the Zn-Cu-BTC/MCFs had good recyclability and CO2/N2selectivity up to 12.5 determined via IAST (CO2:N2= 85:15).
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Li Wang,Hao-wen Zhang,Guo-liang Liu,Di-wen Jiang,Kai-long Li,Jun-yan Lou,Zhe-sheng Feng,Yan Wang
Polyethylene terephthalate/copper (PET/Cu) composite foil, which combines lightweight, flexibility, and excellent electrical conductivity, exhibits promising potential for applications in flexible electronics, portable devices, and lithium-ion battery current collectors. However, achieving efficient and stable metallization of the PET substrate with robust interfacial bonding remains a significant challenge. In this study, an ultra-thin PET/Cu composite foil with excellent adhesion and conductivity was prepared through interfacial engineering. The fabrication process involves oxygen plasma etching, functional silane grafting, and electroplating. The prepared PET/Cu composite foil features a copper layer thickness of approximately 1 μm and presents the adhesion strength meeting the ASTM D3359 5B standard. Meanwhile, the foil achieves a minimum resistivity of 2.137 × 10 −8 Ω m. Compared to the pure copper foil, the PET/Cu composite foil exhibits a 44.89 % reduction in areal mass while maintaining exceptional electrochemical performance, revealing substantial prospects as the next-generation anode current collector for lithium-ion batteries.
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Chemical Science
·
2025
·
IF 7.4
Guozhou Feng,Yuxin Fan,Lechen Diao,Zhichao Miao,Jin Zhou
Electrocatalytic hydrogenation (ECH) of 5-hydroxymethylfurfural (HMF) to 2,5-bis(hydroxymethyl)furan (BHMF) is regarded as a green synthesis strategy for generating high quality bio-based chemicals. However, simultaneously regulating both the hydrogen (H) coverage and the adsorption behavior of HMF presents a significant challenge, particularly in unraveling the intricate structure–activity relationship and achieving a selective target product. Here, we enhance the availability of hydrogen (H*) and modulate surface electronic interactions with 5-hydroxymethylfurfural (HMF) to facilitate selective electrochemical hydrogenation (ECH) of HMF by introducing palladium as an auxiliary component. Pd–Cu dual sites synergistically enhanced H* supply and HMF activation while suppressing the competing hydrogen evolution reaction. The optimized electrocatalyst exhibits notable catalytic performance, attaining a selectivity of 99.3% and a faradaic efficiency of 97.5% for BHMF at a potential of −1.15 V (vs. Ag/AgCl). Density functional theory (DFT) calculations demonstrate that Pd doping is crucial for enhancing the adsorption of H* and HMF* intermediates, thereby promoting the hydrogenation of HMF through the Langmuir–Hinshelwood (L–H) mechanism under neutral conditions. This work establishes a catalyst design paradigm where atomic-level dopant engineering regulates multistep protonation kinetics, offering fundamental insights into biomass electrorefining.
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OPTICS AND LASER TECHNOLOGY
·
2025
·
IF 5
Peilin Cao,Jiahua He,Cong Wang,Kaiwen Ding,Yulong Ding,Dejin Yan,Nai Lin,Ji’an Duan
The reliability of the sapphire-metal joint technology in electronic devices determines its performance for industrial applications. Hence, we propose a method to enhance the connection strength between sapphire and metal based on micro-nanostructures on the substrate surface fabricated by femtosecond laser technology. The micro-nano modification of the substrate surface effectively improves the wettability of the silver paste, contributing to the spreading of the solder. The influence of different substrate surface morphologies on the joint strength is also investigated. It is found that the Cu/ sapphire substrate with cone microstructure arrays has the highest joint strength, reaching 27.2 MPa at a sintering temperature of 300 °C, which is about 4 times increase compared to the flat substrate (7.3 MPa). Further, the effect of different sintering parameters on the joint strength of the cone-structured array substrate is studied. The morphology of the cross-section and shear damage surfaces for connecting structures is analyzed, revealing that the mechanism of interface strength enhancement is mechanical interlocking. This fabrication of micro-nanostructures on substrate surfaces by femtosecond lasers provides a simple and efficient approach for the high-performance joining of ceramics and metals.
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Chemical Science
·
2025
·
IF 7.4
Jiye Feng,Danni Shi,Fei Wang,Yiming Zou,Weicheng Li,Wenbiao Zhang,Huai-Jun Lin,Yuying Meng,Qingsheng Gao
The electrochemical reconstruction of metal-organic frameworks (MOFs) offers a promising approach for in situ fabrication of high-performance electrocatalysts. However, this innovation is often hindered by unpredictable structural transformations due to the complex thermodynamic and kinetic interplay of such multiple electrochemical and chemical processes. Herein, the reaction-atmosphere (Ar or CO2) guided reconstruction of Cu-based MOFs to Cu nanoparticles with mix-valence surface/interfaces was for the first time investigated to unravel the kinetic contribution made by intermediate chemisorption. As shown, Cu-1,3,5-benzenetricarboxylate (HKUST-1) with frangible Cu-O4 nodes undergoes thermodynamically favored reduction quickly upon applying cathodic potentials, followed by the varied surface changes kinetically governed by the intermediates of hydrogen evolution or CO2 reduction reactions (HER or CO2RR). Under an Ar atmosphere, the predominant HER increases the [OH-] of the microenvironment near cathodes and thereby boosts the re-oxidation of in-situ formed Cu toward Cu/Cu2O interfaces. Conversely, the CO2RR facilitates the strong adsorption of *CO on Cu surfaces, effectively preserving Cu(0) species. Thanks to the rich Cu/Cu2O interfaces with the lowered energy barrier for *CO-*CO coupling during the subsequent CO2RR test, the restructured electrocatalysts under Ar affords the obviously improved CO2-to-C2H4 conversion as compared with the counterpart restructured under CO2. Such atmosphere-controlled reconstruction strategy is further validated using CuBDC (BDC = 1,4-benzenedicarboxylate) with labile Cu-O4 nodes, while CuPz2 (Pz = pyrazole) with robust Cu-N4 coordination remains stable, highlighting the framework-dependent nature. These findings establish atmosphere-controlled reconstruction of metastable MOFs as a powerful tool for rational electrocatalyst design.
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Journal of Energy Chemistry
·
2018
·
IF 3.886
Yunfeng Bao,Chunlei Huang,Limin Chen,Yu dong Zhang,Long Liang,Jinjun Wen,Mingli Fu,Junliang Wu,Daiqi Ye
Anatase TiO 2 nanosheets (-ns-) with dominant exposed {001} facets were used as support to load copper, and the synthesized Cu/TiO 2 -ns catalysts were evaluated for CO 2 hydrogenation to methanol. Under the reaction conditions, P = 3.0 MPa, T = 260 °C, V (N 2 ): V (H 2 ): V (CO 2 ) = 8:69:23 and gas hourly space velocity (GHSV) = 3600 mL g −1 h −1 , the methanol yield reached an appealing high value, 5.6%. Copper-loading amount, calcination temperature and reduction atmosphere have been investigated in this work, which significantly influence the particle sizes of copper and/or the defect concentration in TiO 2 , then leading to different catalytic performance. Characterizations of XRD, EPR, CO 2 -TPD and FTIR demonstrate that higher specific surface area of Cu is good for the hydrogenation of CO 2 and adequate amount of Ti 3+ plays important roles in CO 2 activation. Both of them facilitate high turnover frequency (TOF) of methanol formation.
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SENSORS AND ACTUATORS B-CHEMICAL
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2016
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IF 4.758
Jihong Liang,Yifan Zheng,Zongjian Liu
Cu electrodes are prepared by thermal annealing of Cu nanowires under Ar atmosphere at 600–800 °C for 30 min. Investigation of as-prepared electrodes by both X-ray diffractometry and scanning electron microscopy indicates that after annealing a rise in the size of Cu nanowires occurs due to the melting of some small-sized Cu nanowires. When the annealing temperature is not too high (e.g. 600 °C), the melting of small-sized nanowires may create many tightly-connected junctions among big-sized nanowires, leading to the formation of a stable, porous nanowire network. The measurements of both electrochemical active surface areas and electrocatalytic activity of these Cu electrodes demonstrate that their active surface areas decrease with increasing the annealing temperature and the electrode prepared at 600 °C shows the highest activity for reduction of nitrate in acidic medium. Examination of the electrode prepared at 600 °C as nitrate sensor via differential pulse voltammetry reveals that this sensor exhibits excellent performance: a linear response ranging from 8 to 5860 μM (R 2 = 0.999), a sensitivity of 1.375 μA/μM, and a detection limit of 1.35 μM at a signal-to-noise ratio of 3. Compared with the Cu-based sensors reported in the literature, this nanowire-based sensor not only possesses the broadest linear range but also has a very low detection limit. Its stability, anti-interference ability, and application to nitrate detection in real samples are also investigated.
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SURFACE & COATINGS TECHNOLOGY
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2011
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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.
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Science China-Physics Mechanics & Astronomy
·
2018
·Vol. 61
·期 9
·1-4
·
IF 2.754
Zhang Yue,Liu Wenhao,Si Jin,Zhu Xiyu,He Chengping,Zhao Haonan,Wen Hai-Hu
Superconductivity is observed in a new nontoxic cuprate system Ga-Ba-Ca-Cu-O, with T c = 82 K for GaBa 2 Ca 5 Cu 6 O 14 + δ ( 5 (Ga-1256) and T c = 116 K probably for GaBa 2 Ca 3 Cu 4 O 10+δ (Ga-1234) or GaBa 2 Ca 2 Cu 3 O 8+δ (Ga-1223), respectively. All compounds are fabricated by solid state reaction method under high pressure and high temperature. Samples are characterized by resistivity, magnetization and X-ray diffraction (XRD) measurements. The temperature dependence of magnetization measured in both zero-field-cooled and field-cooled processes on one sample (S1) shows two superconducting transitions at about 82 K and 113 K. The estimated shielding fraction for the phase with T c of 82 K is about 67%, while the fraction for another phase with T c of 113 K is quite small. The XRD Rietveld refinement for S1 indicates two main phases existing in the sample, Ga-1256 with fraction of about 58% and non-superconducting Ca 0.85 CuO 2 with fraction of about 42% respectively. Thus, we can conclude the superconducting phase with transition temperature of 82 K is due to Ga-1256. The resistivity measurement also confirms the superconductivity for S1, and the resistivity reaches zero at about 82 K. The temperature dependence of magnetization for another sample (S2) shows much higher superconducting shielding fraction for the phase with T c of 116 K, which may be a promising prospective for the synthesis of Ga-1234 or Ga-1223 phase.
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ChemCatChem
·
2021
·Vol. 13
·期 18
·3960-3966
·
IF 5.686
Peng Ren,Qinglin Li,Tao Song,Zhaozhan Wang,Ken Motokura,Yong Yang
In this study, we report a highly stable and efficient single-atom Cu dispersed on N-doped porous carbon as a superior catalyst for azide-alkyne cycloaddition reaction. A broad set of 1,4-disubstituted 1,2,3-triazoles was synthesized in high to excellent yields with good tolerance of various functional groups in a cost-effective, environment-friendly manner. Parallel studies show that the single-atom Cu with unique coordination structure exhibits superior catalytic activity to the metallic Cu nanoparticles analogue. Remarkably, the single-atom Cu catalyst demonstrates robust stability and can be reused several times without variations in activity and regioselectivity. Graphical Single-atom catalysis : A single-atom Cu dispersed on N-doped carbon exhibits superior catalytic activity for efficient and selective AAC reaction to access a broad set of 1,4-disubstituted 1,2,3-triazoles in a facile and environmentally-benign manner. Single-atom Cu catalyst demonstrates both higher reactivity and stronger stability than the supported Cu nanoparticles under the same reaction conditions.
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