MATERIALS CHARACTERIZATION
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2025
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IF 5.5
Yaju Zhou,Jingyi Zhou,Weiwei Zhang,Jianglei Fan,Shen Wu,Xiuqing Li,Shizhong Wei
Oxide dispersion strengthened (ODS) Cu alloy is a kind of structural material with high thermal conductivity and high stability. It is promising to maintain mechanical integrity under thermal conductivity and high temperature conditions. These excellent properties are directly or indirectly attributed to the ultra-high number density of nano oxide particles, which act as a strong barrier for grain growth, dislocation slip and grain boundaries (GBs) slip. In this study, Cu-Cr-Y-Al-Ti-Si and ODS Cu-Cr-Y-Al-Ti-Si alloys were prepared by combining mechanical alloying with spark plasma sintering (SPS) technology. The influence of Cu 2 O on the microstructure, mechanical properties, and thermal stability of the Cu-Cr-Y-Al-Ti-Si alloy were investigated. Both alloys exhibited a heterogeneous mixture of coarse and fine grain structures. However, the addition of Cu 2 O led to grain refinement and the precipitation of a high density of uniformly distributed, nano-sized oxide particles throughout the copper matrix. Compared to the Cu-Cr-Y-Al-Ti-Si alloy, the ultimate tensile strength of the ODS Cu-Cr-Y-Al-Ti-Si alloy escalated from 409 MPa to 482 MPa, while the elongation slightly decreased from 17.2 % to 15.2 %. The ODS CuCrYAlTiSi alloy also demonstrates a room temperature thermal conductivity equivalent to 62.8 % of pure copper, and exhibits ultra-high microstructural stability after annealing at 600 °C for 100 h. The outstanding strength, ductility and high-temperature stability are primarily owing to the coherent nano-sized Y-X-O (X = Al, Ti, Si) particles dispersed in the ultra-fine grain copper matrix. These findings indicate that by integrating component design and process optimization, it is possible to effectively and efficiently produce ODS CuCrYAlTiSi alloy, which holds promising application prospects in structural materials for nuclear fusion reactors.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Na Wang,Yibo Zhang,Zelin Meng,Mingyang Song,Heming Zhao,Yang Wang,Shuai Bai,Jianglei Hu,Fengwei Shi,Xia Yang
Addressing the low surface area and high charge recombination of graphitic carbon nitride (g-C 3 N 4 ), this study employs a synergistic carboxylation and MOF-loading strategy. Copper-based MOF (Cu-MOF) was uniformly loaded onto carboxylated spherical g-C 3 N 4 (C 3 N 4 –C) via a solvothermal method, creating a visible-light-responsive C 3 N 4 –C-MOF photocatalyst. Material characterization results indicate that the characteristic peak at 1632 cm −1 in the Fourier Transform Infrared Spectroscopy confirms the successful grafting of 4-carboxybenzoic acid (4-CBA). Carboxylation enhanced hydrophilicity and optimized surface charge, improving reactant adsorption. Photoelectrochemical tests showed significantly boosted visible light absorption, increased photocurrent density, and reduced EIS arc radius, confirming efficient interfacial charge separation. Photocatalytic hydrogen production experiments revealed that under simulated solar irradiation, the hydrogen production rate of C 3 N 4 –C-MOF2.0 reached up to 12.68 mmol g −1 h −1 , representing an approximately 1.68-fold increase compared to the unmodified C 3 N 4 -MOF. This work provides a novel approach for designing MOF/functionalized g-C 3 N 4 composites, advancing solar-driven hydrogen production.
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Nature Communications
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2025
·Vol. 16
·期 1
·1-12
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IF 15.7
Wu Lei,Dang Kun,Li Qiaozhen,Xu Yi,Zhang Yuchao,Zhao Jincai
Semiconductor-based photoelectrochemistry commonly relies on efficient interactions between semiconductor surfaces and adsorbates for promoting charge transfer and efficiently activating inert bonds. But at the repulsive interfaces (e.g., between like-charged substrates and electrodes), such interactions cannot be achieved. Contrary to this paradigm, we find that the van der Waals interaction between a series of N-coordinated Cu complex cations and BiVO 4 photoanodes results in a high photovoltage of 0.53 V and charge transfer efficiency of 96%, along with the photocurrent density approaching the theoretical limit of BiVO 4 . This non-covalent interaction enables the universal generation of nitrogen-centered radicals from directly cleaving native N−H bonds and generates N–N coupling products with a Faradaic efficiency exceeding 96%. Its practical application is further demonstrated in an amplified photoelectrochemical reactor, generating a photocurrent of 409 mA and a yield rate of 6069 μmol h −1 for hydrazine production, which is competitive with most reported N−N coupling methods.
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MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Fang Wang,Jingfang Li,Huiting Xia,Jiaqi Liu
Non-invasive, continuous monitoring of sweat biomarkers using flexible sensors enables real-time tracking of indicators such as glucose, electrolytes, and lactate, facilitating early disease detection and improved health management. In this paper, a flexible screen-printed electrode (labeled as Cu@PHEMA/SPE) based on a Cu 2+ doped poly(2-hydroxyethyl methacrylate) (PHEMA) hydrogel was prepared by a simple free radical polymerization method, which is used for glucose and ascorbic acid detection in sweat. This hydrogel exhibits excellent mechanical properties (184 kPa and 346 %), self-healing capabilities and recycled self-adhesive performance. Cyclic voltammetry (CV) and chronoamperometry techniques were employed to investigate the electrochemical properties of the hydrogel electrode in an alkaline solution and the flexible electrode in a neutral solution, with respect to glucose and ascorbic acid. The flexible electrode demonstrated a wide linear range, high sensitivity, and a low detection limit. Specifically, glucose detection ranged from 0 to 2 mM, exhibiting sensitivities of 122.24 and 24 μA/mM/cm 2 , with a detection limit of 4.5 μM. Moreover, it can detect ascorbic acid in the range of 0–220 μM, with sensitivities of 799.85 and 201.94 μA/mM/cm 2 , and a detection limit of 0.96 μM. Furthermore, the electrode displayed good selectivity for interfering substance such as uric acid (UA), dopamine (DA), lactic acid (LA), sodium chloride (NaCl), and potassium chloride (KCl), and it maintained performance despite external deformation. Notably, real sweat samples analysis demonstrated strong concordance with the results obtained using commercially available kits. These results indicate that this flexible electrode has great potential for application in wearable devices.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
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IF 14.7
Zhu Jiawei,Zhang Yu,Chen Zitao,Zhang Zhenbao,Tian Xuezeng,Huang Minghua,Bai Xuedong,Wang Xue,Zhu Yongfa,Jiang Heqing
Cu-oxide-based catalysts are promising for CO 2 electroreduction (CO 2 RR) to CH 4 , but suffer from inevitable reduction (to metallic Cu) and uncontrollable structural collapse. Here we report Cu-based rock-salt-ordered double perovskite oxides with superexchange-stabilized long-distance Cu sites for efficient and stable CO 2 -to-CH 4 conversion. For the proof-of-concept catalyst of Sr 2 CuWO 6 , its corner-linked CuO 6 and WO 6 octahedral motifs alternate in all three crystallographic dimensions, creating sufficiently long Cu-Cu distances (at least 5.4 Å) and introducing marked superexchange interaction mainly manifested by O-anion-mediated electron transfer (from Cu to W sites). In CO 2 RR, the Sr 2 CuWO 6 exhibits significant improvements (up to 14.1 folds) in activity and selectivity for CH 4 , together with well boosted stability, relative to a physical-mixture counterpart of CuO/WO 3 . Moreover, the Sr 2 CuWO 6 is the most effective Cu-based-perovskite catalyst for CO 2 methanation, achieving a remarkable selectivity of 73.1% at 400 mA cm −2 for CH 4 . Our experiments and theoretical calculations highlight the long Cu-Cu distances promoting *CO hydrogenation and the superexchange interaction stabilizing Cu sites as responsible for the superb performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Shihao Xiong,Tao Peng,Liangliang Huang,Rui wang,Beibei He,Jun Jin,Huanwen Wang,Yansheng Gong
Semiconductor photocatalytic nitrogen reduction reaction (PNRR) stands as a promising clean technique for ammonia synthesis, yet it confronts numerous challenges. In this study, Ag nanoparticle-modified Cu-doped Bi 2 WO 6 (ACB) porous composite materials with varying mass percentages were successfully synthesized using a solvothermal reduction approach. The incorporation of transition metal Cu effectively modulates the energy band position of Bi 2 WO 6 . Furthermore, the introduction of Ag nanoparticles significantly suppresses the recombination of photogenerated carriers. Without adding sacrificial agent, the photocatalytic nitrogen fixation yield of ACB reaches an impressive 184.93 μmol·g −1 ·h −1 , which is 5.44 times higher than that of pristine Bi 2 WO 6 . A comprehensive analysis of the experimental results reveals that the combined effect of Cu doping and Ag nanoparticle loading endows ACB with an increased exposure of active sites, thereby significantly enhancing its photocatalytic nitrogen fixation performance. This research offers a promising approach for the design of metal nanoparticle-supported catalysts for PNRR, holding significant implications for the advancement of other material systems.
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LANGMUIR
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2025
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IF 3.9
Chaobao Wang,Jiale Chen,Binlu Zhang,Xinqi Zou,Yuyang Xi
Copper nanoparticles are widely used for surface repair due to their inherent softness. However, traditional Cu nanoparticles (NPs) rely on passive mechanical interlocking, which has low repair efficiency, poor stability, and reduces tribological efficiency. To address these issues, this study proposes a chemically active repair strategy based on polydopamine (PDA)-coated copper nanoparticles with a core–shell structure (Cu@PDA). The Cu@PDA nanoparticles significantly improved the hydrophilicity of the friction interface, reducing the water contact angle from 64° to 42°, thereby facilitating the stable formation of lubricating films. Under loads ranging from 49 to 147 N, the Cu@PDA suspensions exhibited excellent tribological performance in a copper–copper friction pair, achieving up to a 41.2% reduction in the friction coefficient and a 78.3% reduction in the wear rate. Microscopic morphology and wear scar analyses revealed that the enhanced lubrication performance resulted from two synergistic mechanisms: (1) under friction, Cu@PDA nanoparticles demonstrate strong underwater adhesion and spontaneously form a stable directional transfer film for active wear repair and (2) nanoparticles fill wear furrows, enhancing surface topography and lubricating film continuity. This study addresses unstable adhesion and delayed repair in water-based lubricating films, offering a novel strategy for durable aqueous lubrication systems with potential in high-load applications like marine propulsion and hydraulic systems.
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ADVANCED FUNCTIONAL MATERIALS
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2022
·Vol. 32
·期 32
·2203471
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IF 19.924
Daijie Deng,Junchao Qian,Xiaozhi Liu,Hongping Li,Dong Su,Henan Li,Huaming Li,Li Xu
Dual–single-atom catalysts with synergistic effect of adjacent atomic metal sites show a great potential for oxygen reduction reaction (ORR). Herein, a dynamical synthetic strategy is demonstrated for the rational design of dual-atom catalyst ((Zn, Cu) − NC) with non-covalent Cu and Zn sites as nitrogen-doped carbon as support. Owing to the non-covalent interaction of Zn and Cu atomic pair sites, (Zn, Cu) − NC exhibits significant performances for ORR, surpassing the catalysts with individual Zn or Cu site. The theoretical calculations reveal that (Zn, Cu) − NC can highly activate the linear O 2 molecule via the non-covalent interaction between Zn and Cu pairs, providing the more effective overlap between the metal 3d orbitals and O 2p orbital. Therefore, the ORR activity is optimized with the improvement of the adsorption configuration and adsorption energy of O 2 . Further, both liquid and quasi-solid zinc − air batteries with (Zn, Cu) − NC as air cathodes achieve remarkable energy density and stability. This research proposes a facile synthetic strategy to construct single-atom catalysts and presents an insightful understanding of the non-covalent interplay between heteronuclear metal atoms in dual-atom catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Xingling Zhao,Xue Zhou,Yupei Xia,Zihan Xu,Mingjun Song,Zihan Wang,Qingjie Guo,Zaiyong Jiang
Catalytic oxidation of carbon monoxide (CO) by Cu/Al 2 O 3 has garnered increasing interest in recent years due to its promising application prospects. Numerous investigations conducted on the Cu/Al 2 O 3 system, but its catalytic performance for CO oxidation is still not as promising as that of precious metal catalysts. Increasing the loading amount of the active Cu on Al 2 O 3 surface is a feasible method for improving its activity. However, with the increase of Cu loading, the agglomeration and enlargement of Cu particles is inevitable, which reduces the active Cu amount. Therefore, the utilization rate of Cu atoms is not high and the catalytic performance often can not further rise. Enhancing active Cu loading amount as high as possible is a prerequisite to further enlarge the activity of Cu/Al 2 O 3 catalyst. Herein, self-synthesized Al 2 O 3 nanofibers (Al 2 O 3 -nf) with high specific surface area and abundant penta-coordinated aluminum (Al V ) are used as the support to maximize the Cu loading amount by chemical vapor deposition (CVD). And commercially available α-Al 2 O 3 is used for comparative experiment. The high specific surface area could make Cu high dispersion on Al 2 O 3 , even at 20 wt% Cu loads, which is beneficial to high concentration load of active Cu. The catalytic activity of Cu/Al 2 O 3 -nf-CVD gradually increases with the increase of Cu loading from 2 wt% to 20 wt%, exhibiting a clear linear correlation with the surface content of Cu 0 on the catalyst. Meanwhile, this result confirms that Cu 0 plays a crucial role in CO oxidation of Cu/Al 2 O 3 . However, commercial α-Al 2 O 3 reaches its highest activity when the Cu load is 5%, and then its activity begins to decrease due to the agglomeration of particles. Moreover, Cu/Al 2 O 3 -nf-CVD also exhibits remarkable thermal stability for CO oxidation. This work highlights a new strategy to synthesis of high Cu loading amount, high activity and thermostable Cu/Al 2 O 3 catalyst for low-temperature oxidation of CO.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2024
·
IF 4.4
Wei Xiang,Yueting Liao,Jinwei Cui,Yangyang Fang,Bining Jiao,Xuesu Su
Antibiotic adsorbents are getting significant attention due to the hazards posed by the accumulation of tetracycline antibiotics in water, which can adversely impact human and environmental health. Bimetallic organic frameworks (BMOFs) exhibit considerable potential in adsorption owing to their dense pore structures and synergistic effects. However, synthesizing efficient, low-cost, and easy-to-prepare BMOFs faces several challenges. Here, we describe the practical synthesis of a series of Fe/Cu-bimetallic organic frameworks (Fe/Cu-MOFs) using simple room-temperature aqueous solvent methods. The pore size structure of Fe/Cu-MOFs is determined by the Fe/Cu ratio employed in the synthesis process. Remarkably, when the Fe/Cu molar ratio was 1:2, the void ratio of Fe/Cu-MOFs increased to 0.7326 cm 3 /g, with a predominant mesoporous structure, and the maximum tetracycline (TC) adsorption capacity exhibited by Fe/Cu-BTC-1/2 was reported at a Q max of 1130.23 mg/g. The adsorption kinetics followed the quasi-second-order kinetic model, and the adsorption isotherms were consistent. The Fe/Cu-BTC-1/2 was effective throughout a wide pH range (6.0–10.0), exhibiting resilience against ionic interference and enabling recycling. The predominant mechanisms of TC adsorption by Fe/Cu-BTC-1/2 include coordination, vacancy filling, and π-π stacking. Thus, our research provides an excellent adsorbent for TC antibiotics and novel insights into the simple synthesis of BMOFs and their application in environmental remediation.
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PROGRESS IN ORGANIC COATINGS
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2024
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IF 6.5
Shuwen Luo,Huali Li,Min Wu,Yong Tan,Fa-Qian Liu
The threat of fouling organisms attached to ships and offshore equipment has brought great obstacles to the development of marine undertakings. Antifouling coatings represented by Cu 2 O is one of the most widely used antifouling paints at present, but they are facing the situation of initial explosion and final release exhaustion of Cu ions, which make long-term antifouling become one of the bottlenecks of the current antifouling coatings. To solving the problem of controlled-release of Cu ions, in this paper, a controlled-release system based on galvanic corrosion is prepared by using reduced graphene (rGO) supported poorly soluble metal Cu as antifouling agents (rGO/Cu), and the controlled-release principle of the system is studied from the perspective of electrochemistry. Its antifouling performance is evaluated by Cu ions release rate and indoor antifouling experiment. The experimental controlled release system has the controlled-release performance of Cu ions, which benefits from the shielding effect of rGO sheet, and the stable dissolution of Cu after the formation of galvanic corrosion between poorly soluble Cu and rGO. The sample EC041 with the highest rGO content (17.70 %) has the specific surface area ratio of rGO to Cu of 462; the Cu ions release rates dispersed into the coatings have the lowest RSD value of 44.45 % during 21 days testing cycle. The experimental results show that the controlled-release system has a stable antifouling effect.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Xiangshi Sun,Kongtong Yu,Yulin Zhou,Shiyan Dong,Wenji Hu,Yating Sun,Yuhuan Li,Jing Xie,Robert J. Lee,Fengying Sun,Yifan Ma,Shengnian Wang,Betty Y. S. Kim,Yifan Wang,Zhaogang Yang,Wen Jiang,Youxin Li,Lesheng Teng
The use of superoxide dismutase (SOD) is currently limited by its short half-life, rapid plasma clearance rate, and instability. We synthesized a small library of biofriendly amphiphilic polymers that comprise methoxy poly(ethylene glycol)-poly(cyclohexane-1,4-diyl acetone dimethyleneketal) (mPEG-PCADK) and mPEG-poly((cyclohexane86.7%, 1,5-pentanediol13.3%)-1,4-diyl acetone dimethylene ketal) (PK3) for the targeted delivery of SOD. The novel polymers could self-assemble into micellar nanoparticles with favorable hydrolysis kinetics, biocompatibility, long circulation time, and inflammation-targeting effects. These materials generated a better pH-response curve and exhibited better hydrolytic kinetic behavior than PCADK and PK3. The polymers showed good biocompatibility with protein drugs and did not induce an acidic microenvironment during degradation in contrast to materials such as PEG-block-poly(lactic-co-glycolic acid) (PLGA) and PLGA. The SOD that contained reverse micelles based on mPEG2000-PCADK exhibited good circulation and inflammation-targeting properties. Pharmacodynamic results indicated exceptional antioxidant and anti-inflammatory activities in a rat adjuvant-induced arthritis model and a rat peritonitis model. These results suggest that these copolymers are ideal protein carriers for targeting inflammation treatment.
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