COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Lining Fan,Huishun Shao,Wei Chen,Zhiwen Ding,Hui Zheng,Xiaoxiao Guo,Peng Zheng,Liang Zheng,Yang Zhang
Graphene/Cu composites have attracted significant research attention due to their exceptional electrical conductivity and ampacity. However, the growth of high-quality graphene on curved copper surfaces remains challenging due to the poor wettability between Cu and C. This study presents a novel approach for the in-situ growth of nitrogen-doped graphene/Cu composite wire utilizing copper wire surface oxidation and microwave plasma heating. Nitrogen defects and CuO nanoparticles enhance the Cu-C interface, promoting uniform graphene growth, efficient electron transfer and Joule heat dissipation. Consequently, the composite wire demonstrates a 10.4 % improvement in electrical conductivity and a 48.6 % increase in ampacity. The finite element simulation was employed to investigate the primary mechanisms underlying ampacity enhancement and thermal failure in nitrogen-doped graphene/Cu wire. This work offers a promising strategy for improving the graphene-Cu interface, paving the way for advanced composite wires with superior electrical properties.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 10
·1-8
·
IF 2.8
Liu Yingchun,Meng Xianghe,Shi Wenming,Deng Yuanhao,Zhang Hongjun
The high-temperature poling strategy (110 °C, 30 kV/cm, 20 min) was imposed on Cu-doped (Ba 0.94 Ca 0.06 )(Zr 0.05 Ti 0.95 )O 3 ceramics which had the Curie temperature of 117 °C, to enhance the piezoelectric performances. The high-temperature poled piezoelectric constants d 33 and electromechanical coupling factors k p were 410 pC/N and 0.516, which were enhanced by 17.1% and 15.4%, respectively, higher than that of traditional poled ones. Effects of high-temperature poling on the switching characteristic between non-180° and 180° domains were verified by the intensity ratio of splitting peaks at 2 θ around 45°, using the X-ray diffraction analysis. The high-temperature poled samples showed more asymmetric hysteresis loops, with higher internal bias field of 1.8 kV/cm, maximum polarization of 18.5 μC/cm 2 , and residual polarization of 10.7 μC/cm 2 , but lower coercive field of 2.5 kV/cm and smaller positive hysteresis of 1.3%. The high-field piezoelectric constant d 33 * showed a pronounced jump of 112.2 pm/V at 110 °C, confirming the optimal poling temperature. The stronger compensating defect dipole field mainly contributed to the asymmetry. And the tiny and easily reversible domains, observed by the in-situ piezoelectric force microscopy, were responsible to the improvement on piezoelectricity.
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FUEL
·
2025
·
IF 7.5
Xiao Zhang,Xueying Zhang,Cai Liang,Feng Shen,Boxiong Shen
Water poisoning remains a significant challenge for Mn-based catalysts in the purification of low-temperature industrial flue gas. In this study, a water-resistant catalyst, Cu-doped MnO x dispersed on a flower-like hollow sphere carrier (Cu 0.1 Mn 1 -Al 2 O 3 (NF)), was developed. The introduction of 5 % water vapor into simulated flue gas reduced the o-xylene oxidation efficiency of the unmodified MnO x /γ-Al 2 O 3 catalyst by 20 %, whereas Cu 0.1 Mn 1 -Al 2 O 3 (NF) exhibited only a 5 % reduction, and it shows a water resistance surpasses those of most of the reported MnO x catalysts. Upon water vapor withdrawal, Cu 0.1 Mn 1 -Al 2 O 3 (NF) showed a 2 % irreversible efficiency loss, compared to 9 % for MnO x /γ-Al 2 O 3 . Mechanistic studies highlight the role of the flower-like morphology in reducing hydrogen-bonded H 2 O and the primary contribution of Cu + doping in suppressing –OH generation on metal sites, likely due to weakened H 2 O dissociation at Mn-Ov-Cu oxygen vacancies. Additionally, Cu 0.1 Mn 1 -Al 2 O 3 (NF) has improved water desorption capability evidenced by 8 °C lower endothermic temperature for H 2 O volatilization than that of MnO x /γ-Al 2 O 3 . Furthermore, a H 2 O-involved Mars-van Krevelen (MvK) mechanism was proposed to explain the ∼ 2 % irreversible efficiency reduction for Cu 0.1 Mn 1 -Al 2 O 3 (NF) in wet gas − attributed to H 2 O dissociation at oxygen vacancies hindered lattice oxygen replenishment. Based on this mechanism, an air-purging regeneration protocol was developed to enhance the catalyst’s operational stability under wet flue gas conditions.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 5
·1-8
·
IF 5.705
Chen Wanlu,Yao Xun,Zhou Xinchun,Zhao Kang,Deng Anping,Li Jianguo
A flower-like Au/Cu alloy nanocomposite (Au/Cu NFs) was synthesized and used in an electrochemiluminescence (ECL) based method for sensitive determination of the dye Sudan I. The Au-g-C 3 N 4 nanosheets as an ECL emitter were prepared by electrostatic adsorption between gold nanoparticles and g-C 3 N 4 . They form a film on a glassy carbon electrode (GCE) and then can be connected with Sudan I antigen via gold-nitrogen bond and amidation reactions. The Au/Cu NFs combined with Sudan I antibody also via the Au-N bond and was introduced into the modified GCE by specific recognition between the antibody and the antigen. The overlap between emission spectra of the Au-g-C 3 N 4 nanosheets and absorption spectra of Au/Cu NFs enabled the appearance of ECL resonance energy transfer process. That is, when the Sudan I analyte not present, the ECL was weakened due to absorption by the gray Au/Cu NFs on applying voltages from −1.7 V to 0 V. Conversely, the Au/Cu NFs on the GCE are reduced due to the competition for the antibody between the analyte and the antigen. A strong green ECL emission was obtained. The ECL response is linear in the 0.5 pg mL −1 to 100 ng mL −1 Sudan I concentration range, and the detection limit is 0.17 pg mL −1 .
An Au/Cu alloy flower-like nanocomposite (Au/Cu NFs) is firstly synthesized as an acceptor to constitute an electrochemiluminescence-resonance energy transfer (ECL-RET) system for sensitive measurement of Sudan I, while Au nanoparticles (Au NPs) functionalized graphitic carbon nitride (g-C 3 N 4 ) acted as a donor.
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DESALINATION
·
2025
·
IF 9.8
Zhiqiang Wu,He Ren,Hao Zhou,Jianeng Ji,Haiyun Ding,Chunyan Li,Minjie Shi,Ying Hong,Jun Yang
Prussian Blue analogs (PBAs) have emerged as one of the promising materials for capacitive deionization (CDI) due to their excellent specific capacity and outstanding ion adsorption capability. However, Mn-based hexacyanoferrate Prussian Blue (MnHCF) suffers from insufficient utilization of active sites and poor ion kinetics during the electrochemical process, resulting in weak ion adsorption capacity and easy destruction of its stable structure. In this work, CuMnHCF was synthesized by incorporating Cu into the MnHCF framework via an in situ solvothermal approach. The appropriate introduction of Cu effectively occupied the interstitial sites of the MnHCF structure, optimized its electronic configuration, and successfully activated both the metal–N bonds and the Fe–CN dual redox-active sites within the framework (evidenced by in situ Raman measurements). These merits collectively led to a significant enhancement in the electrosorption capacity of CuMnHCF toward Na ions. The CuMnHCF electrode exhibits excellent cycling stability in aqueous NaCl electrolyte. After 5000 cycles, the specific capacitance decay is minimal, with a capacity retention rate of approximately 61.5% (5 A g −1 ). As applied in electrochemical desalination experiment at a voltage of 1.2 V for 50 cycles, the retention rate of CuMnHCF electrode reached as high as 82.2%. Additionally, it not only exhibits a high salt removal capacity of 58.4 mg g −1 (salt removal rate: 1.95 mg g −1 min −1 ), but also a peak salt removal rate of 15.7 mg g −1 min −1 . As an application extension, the CuMnHCF electrode also shows excellent desalination performance for K + , Ca 2＋ , and Mg 2 + .
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Solar RRL
·
2025
·
IF 4.7
Xiaoxiao Huang,Jianguo Duan,Qihui Yu,Qing Ma
Graphene composite phase change materials (PCMs) show great application potential in solar energy conversion and storage due to their strong light absorption and high thermal conductivity. To further enhance the photothermal conversion and leakage prevention performance of graphene composite PCMs. This article adopts a “point-surface” modification strategy. Through a hydrothermal reduction self-assembly method, nanocopper particles are doped into polyvinyl alcohol (PVA) cross-linked graphene nanosheets to construct a novel graphene nanosheet-nanosized Cu particle/polyethylene glycol (PEG) composite PCMs. The random distribution of nanocopper particles significantly enhances the spectrum absorption capacity and interfacial heat transfer efficiency of the graphene skeleton. The results show that the thermal conductivity of PEG/PG–Cu 0.06 reaches 0.793 W/m −1 k −1 , which is 317.4% of pure PEG. Its latent heat enthalpy value reaches 185.7 J g −1 , and the enthalpy value attenuation rate after 200 thermal cycles is less than 0.21%. Moreover, when the simulated light intensity was 120 mW cm −2 , the PEG/PG–Cu 0.06 photothermal conversion efficiency is 86.2%. Meanwhile, the cross-linked network formed by PVA and graphene can effectively inhibit PEG leakage, and the leakage rate of PEG/PG–Cu 0.06 is 21.6%. Additionally, the 3D graphene-PVA matrix modified by nano-Cu particles is used to improve the thermal conductivity and the spectrum adsorption capacity of composite PCMs, which have excellent photothermal conversion performance and thermal stability and have great application prospects in solar energy heat storage.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Chenyu Zeng,Anting Ding,Xi Chen,Yongfei Ma,Hui Lin,Han Ding,Fuyu Xie,Lu Zang,Song Cui,Ping Li,Junwei Ma,Zulin Zhang
Cu/BC-PAA (Peroxyacetic acid) system was established in this study to remove sulfamethoxazole (SMX) from waters. Cu/BC-PAA achieved high elimination efficiency (91.2 %, k = 0.081 min −1 ) for SMX within 30 min. Cu (II) loaded on corn straw biochar was converted into form Cu (I) site. Characterization, electron paramagnetic resonance (EPR), and electrochemical analysis proved that Cu (I) and C O took part in the reaction, which accelerated electron transfer and produced free radicals and non-radicals (R-O· and singlet oxygen ( 1 O 2 )). Fukui index and Liquid Chromatograph Mass Spectrometer (LC–MS) analysis revealed that sulphonamide bond cleavage and isoxazole ring opening were the main detoxification pathway. Density functional theory (DFT) calculation exhibited the adsorption energy of Cu/BC (E ads = −3.68 eV) enhanced the electron transfer between Cu (I) and PAA. The evaluation of anion effects, diverse water matrices, various sulfonamide antibiotics, and catalyst cycling tests demonstrated the Cu/BC-PAA system's exceptional stability, broad-spectrum applicability, and excellent reusability. This work successfully synthesized a stable environment-friendly catalyst for efficient activating PAA to eliminate antibiotics in waters.
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PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Mingyue Wang,Xiaohua Jia,Zhiqiang Shan,Haojie Song
Graphene-epoxy coatings show promise for protecting marine infrastructure from extreme environments, but their long-term durability and dual wear-corrosion resistance are limited by poor graphene dispersion and random orientation in the matrix. To address this challenge, we developed a highly ordered graphene-enhanced epoxy‑copper composite (DGr-ILs-EP@Cu) via electrophoretic deposition (EPD). Ionic liquids (ILs) enabled one-step exfoliation and functionalization of graphene nanosheets, yielding a stable, positively charged dispersion for EPD. Under an electric field, the graphene nanosheets (DGr) aligned directionally, achieving an ultralow friction coefficient (0.025–0.06) with exceptional stability over 10 h of wear testing. Crucially, copper ions released in situ from the EPD electrode enhanced the coating's wear resistance, approaching near-zero wear rates. The aligned graphene structure also extended the diffusion path of corrosive species, increasing the coating's impedance modulus by 2 orders of magnitude compared to disordered composites. By correlating microstructure (orientation degree) in the EP matrix with performance metrics (friction coefficient, electrical conductivity, and impedance modulus), we demonstrate a multifunctional coating design and new insights specifically optimized for complex environments.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Junfeng Yang,Jingfeng Wu,Jun Xiong,Yu Wen,Shengyan Yin,Qin Zhang
Herein, utilizing cheap carbonated beverage (Fanta) as the carbon source, the multiphasic TiO 2 /Cu-C composites are successfully designed and prepared for efficient photocatalytic H 2 generation. Excitingly, the controllable preparation of triphasic, biphasic and rutile phase TiO 2 can be achieved by adjusting the reaction temperature. As expected, under ultraviolet–visible light irradiation, the triphasic TiO 2 /Cu-C-5 exhibited the best photocatalytic H 2 evolution rate (HER, 28.53 mmol g −1 h −1 ), which is about 21.45 and 1.65 times as high as than that of triphasic TiO 2 and P25/Cu-C-5, respectively. In addition, the HER reached 7.67, 12.47 and 3.46 mmol g −1 h −1 in Tianyi lake water, Ganjing river water and Bohai seawater, respectively. Furthermore, the experiment of inorganic salt ions effect on HPR shows that NO 3 − and SO 4 2 - ions have great negative influence. This transient photocurrent response, photoluminescence and photoluminescence lifetime experiments indicate that the carrier Cu-C and the construction of heterophase junctions are conducive to the separation of photogenerated charges and reducing their recombination efficiency, resulting in the improvement of the photocatalytic hydrogen evolution performance. Meanwhile, the Cu-C sample contains hollow spheres, which facilitate the refraction of light and enhance its absorption. These advantages strongly prove that the triphasic TiO 2 /Cu-C photocatalyst has potential application prospects in the field of catalytic hydrogen evolution in deionized water and natural water.
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TALANTA
·
2025
·
IF 6.1
Jiahui Huang,Siyi Wei,Maopu Tu,Weiqi Deng,Le Zhong,Fan Jiang,Zhixin Li,Ray P.S. Han,Xiaoyu Deng,Shaohua Xu,Yingzhou Tao
The measurement of total antioxidant capacity (TAC) is vital for evaluating the nutrient content of foods and beverages. The development of novel mimetic enzyme materials with high catalytic activity has led to the creation of highly sensitive methods for TAC assessment. In this study, we introduce a simple and efficient approach for preparing uniformly distributed Cu 2 O/Cu nanoparticles supported on graphite-phase carbon (g-C@Cu 2 O/Cu NPs). These g-C@Cu 2 O/Cu NPs demonstrate excellent peroxidase-like (POD-like) enzymatic activity and exhibit a strong binding affinity for TMB, with a K m value of 0.24 mM. A colorimetric analytical platform for TAC assessment was developed, utilizing g-C@Cu 2 O/Cu NPs, TMB, and H 2 O 2 as the chromogenic system. The method achieved a limit of detection for ascorbic acid as low as 0.15 μM, with a linear range from 0.5 to 100 μM. Furthermore, this method was successfully applied to evaluate TAC in real samples, highlighting its significant potential for food nutritional analysis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Shengyong Lu,Xuanhao Guo,Manting Chen,Guanjie Wang,Juan Qiu,Jiaming Ding,Minghui Tang,Zhengdong Han,Yaqi Peng,Jianhua Yan
The synergistic removal of multiple pollutants from flue gas has attracted growing interest in recent years. In this study, Cu-doped MnCeO x catalysts were synthesized via an impregnation method and integrated into PTFE fibers using a split-film process to enable the simultaneous removal of chlorobenzene (CB) and nitrogen oxide (NO). Among the catalysts tested, Mn 2 Ce 1 Cu 0.6 O x exhibited the highest performance, achieving 90 % CB degradation and 100 % NO conversion at 180 °C. The PTFE-based catalytic fibers also demonstrated excellent removal efficiency, reaching 83.7 % for dioxins at the same temperature. A possible reaction mechanism is proposed in which the NH 3 -SCR process facilitates CB oxidation by generating reactive intermediates. Cu doping was found to enhance the density of acid sites and promote the ring-opening of CB, thereby suppressing chlorine accumulation and improving catalyst stability. These findings provide valuable insights for the development and optimization of catalytic bag filters for the efficient, synergistic removal of multiple pollutants from industrial emissions.
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Molecular Catalysis
·
2024
·
IF 3.9
Hao Qin,Hui Wan,Guofeng Guan
Single atom catalysts have been recently reported as the efficient catalysts for hydroisomerization compared to the conventional nanoparticle catalyst. Despite the fascinating advantage in enhancing the metal activity or reducing the catalyst cost, the long-term stability of the single atom catalyst seemed not that satisfactory, especially when reacting under atmospheric pressure. Herein, Pt single atom catalysts were combined with Cu nanoparticles by different means to explore a new way to improve the catalytic performance. Cu nanoparticles were located away from Pt sites to form a binary catalyst, or acted as the support of Pt atoms to form a single atom alloy (SAA) catalyst. With the binary catalyst Pt 1 –0.1Cu@CS, the conversion of the n -heptane after time on stream of 50 h increased to 70.3 %, higher than Pt 1 @CS (47.3 %). Besides, excessive Cu nanoparticles in the binary catalyst were found rather harmful to the catalysis instead. However, the SAA catalyst Pt 1 Cu@SAPO-11 showed a poor activity in hydroisomerization compared to Pt 1 @CS, indicating that the alloy structure should go against the activation of reactant. The roles of Pt atoms and Cu nanoparticles in different catalysts were discussed in detail. The reaction mechanism of hydroisomerization was refined with the different functions of the dual metal sites. This work might be instructive for the design of single atom catalysts combined with metal nanoparticles.
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