JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Man Dong,Qingqing Pan,Fanfei Meng,Xiaohui Yao,Siqi You,Guogang Shan,Chunyi Sun,Xinlong Wang,Zhongmin Su
Sunlight-driven CO 2 reduction to value-added chemicals is an effective strategy to promote carbon recycling. The exploration of catalysts with efficient charge separation is crucially important for highly efficient CO 2 photoreduction. In this work, the preparation of metal-cluster-based covalent organic framework (CuABD) integrated features from both metal organic frameworks (MOFs) and covalent organic frameworks (COFs) through the condensation of diamines and functionalized trinuclear copper clusters demonstrate a thoughtful design strategy. The reported yield of 1.3 mmol g −1 h −1 for formic acid (HCOOH) under simulated solar irradiation is impressive, surpassing the performance of many COF- and MOF-based catalysts previously reported. Compared to its isomorphic metal-free structure (named BDFTD) and bare trinuclear Cu cluster which present extremely poor catalytic activities, CuABD displays remarkably enhanced CO 2 reduction activity. Experimental and theoretical investigations reveal that the efficient charge transfer between diamine monomer and cyclic trinuclear copper (I) units, and the electron delocalization of the π-conjugated framework are responsible for the appealing catalytic performance. In summary, the work presents a well-structured and scientifically sound exploration of a metal-cluster-based covalent organic framework for efficient CO 2 reduction under sunlight.
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PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Yue Li,Huan Ren,Daolai Sun,Xinqiang Zhao
Vapor-phase catalytic deoxydehydration of 1,2-propanediol (1,2-PDO) to form propylene was performed over various metal-loaded catalysts in an H 2 flow at an ambient pressure. Cu-based catalysts exhibited a relatively high activity for the formation of propylene, while other metal-based catalysts, such as Pt-, Ru-, Rh-, Ni-, and Co-loaded SiO 2 -Al 2 O 3 , primarily produced C-C bond cleavage products. Cu-loaded H 3 PO 4 /SiO 2 -Al 2 O 3 catalysts showed the best catalytic performance, and the catalyst with a Cu and H 3 PO 4 loading of 8 and 10 wt%, respectively, could provide a propylene selectivity of 95.0% with a complete conversion of 1,2-PDO at 280 °C. The Cu-loaded H 3 PO 4 /SiO 2 -Al 2 O 3 catalysts primarily contained Lewis acid sites, and the Cu particles were well dispersed on the catalyst surface with an averaged particle size of 3.1 nm. It is proposed that the vapor-phase deoxydehydration of 1,2-PDO to propylene undergoes multi-step reactions with propanal and 1-propanol as the reaction intermediates.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Kejing Wang,Yongjun Liu,Zhiwen Li,Nan Cui,Lei Sun,Wei Huang
The valence states of Cu site are regarded as an important factor affecting the performance of syngas to higher alcohols (C 2+ OH). Regrettably, the role of Cu 0 and Cu + in CO hydrogenation to higher alcohols remains controversial due to the complexity of the reaction. In this study, Cu 0 and Cu 2 O powders are directly added as the precursors to adjust the ratios of Cu + /(Cu 0 +Cu + ) and Cu particle sizes in CuZnAl catalysts by a complete liquid-phase (CLP) technology. The CAT-Cu 0 catalyst with higher Cu 0 content shows the highest CO conversion (>15%) ascribing to the biggest S Cu , but is also accompanied by the highest CO 2 selectivity (>40%), while the CAT-Cu + catalysts with higher Cu + content displays relative better C 2+ OH selectivity (>60%) and stability due to a higher probability of CO insertion. In-situ DRIFTS experiments reveal that a synergy between larger Cu particle sizes (30～40 nm) and surface Cu + sites, in which larger Cu sizes enhances the probability of bridge CO adsorption, thereby favoring the C–O bond dissociation for CH x formation. Meanwhile, Cu + active sites provide a higher probability for CO/CHO insertion to form CH 3 CHO*/CH 2 CO* intermediates. This study further deepens our understanding of the critical controlling factors for highly selective synthesis of C 2+ OH from syngas over Cu-based catalysts.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Na Ma,Ke Li,Bo Xu,Huafeng Tian,Songbai Ma,Jinlong Li,Yuge Ouyang,Qian Liu,Dagang Liu,Rakesh Kumar
To solve the problem of the presence of heavy metals in water causing water pollution, the biodegradable film based on zein/polyvinyl alcohol (PVA) with the incorporation of nano-hydroxyapatite (nHAP) was fabricated through an electrospinning technique. The copper ion was taken as the representative of heavy metal ions in this study. The result showed that the incorporated nHAP nanoparticles were dispersed within the zein/PVA matrix, and strong hydrogen bonding interactions were formed between the filler and matrix, improving the hydrophobicity of the nanofibrous films and maintaining thermal stability. The adsorption mechanism was analyzed by fitting the adsorption process with pseudo-first-order model and pseudo-second-order model. Based on the ion exchange effect, electrostatic interaction, and complexation, the adsorption capacities of nanofibrous films for Cu(II) were significantly increased after adding nHAP. When the nHAP content was 20 wt.%, the Cu(II) adsorption capacity reached up to 23.86 mg/g, and the adsorption efficiency was 13.94% higher than that of neat zein/PVA nanofibers. This work suggests the potential of the electrospun zein/PVA/nHAP nanofibrous films as desirable eco-friendly materials in metal removal applications.
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ACS Catalysis
·
2025
·
IF 13.1
Ziyang Chen,Hua Tong,Yun Zhao,Jie Cui,Lei Zhou,Jiale Zou,Fuqiang Zhou,Peirong Chen,Daiqi Ye,Limin Chen
TiO2 as a reducible metal oxide has been extensively employed as a support for noble and transition metals. Numerous studies have demonstrated that optimizing metal–TiO2 interactions can significantly enhance the catalytic performance. Meanwhile, the weak metal–support interaction between Cu and TiO2 generally results in unsatisfactory catalytic performance for the hydrogenation of CO2 to methanol. Herein, through support facet and defect engineering, the electron transfer from TiO2 to Cu nanoparticles (NPs) is successfully constructed over Cu/TiO2 (001) catalysts, enabling a sharply enhanced methanol yield of about 7.2% at 5 MPa and 280 °C. Detailed characterizations reveal that the regulation of support defects and the catalyst preparation process boost the defect density over TiO2 and then facilitate the electron transfer from TiO2 to Cu NPs and the highly dispersed electron-rich Cu NPs. This, in turn, promotes the dissociation and spillover of H2, further producing support defects and achieving dynamic regulation. Ultimately, these synergistic interactions drive the hydrogenation of CO2 to methanol. These findings not only demonstrate the Cu/TiO2-based catalyst as one of the most promising catalysts for CO2 hydrogenation to methanol but also establish a generalizable strategy for enhancing catalytic performance through support facet and defect-engineered electron transfer modulation.
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MATERIALS CHARACTERIZATION
·
2025
·
IF 5.5
Dang Xu,Pengqi Chen,Kaichao Fu,Changcheng Sang,Ruizhi Chen,Tao Hong,Jigui Cheng,Kai Xu
The inherent metallurgical incompatibility between dissimilar metals such as tungsten (W) and copper (Cu) engenders weak chemical bonding, substantially constraining the attainment of high strength. This constitutes a critical limitation for nuclear fusion applications demanding robust interfacial integrity. To address these limitations, this study introduces a dual interface reinforcement strategy employing a CrCoNi medium entropy alloy (MEA) interlayer and achieving diffusion bonding of oxide diffusion-strengthened tungsten (ODS-W) and Cu through spark plasma sintering (SPS) technology. At the optimized bonding temperature of 1000 °C, the joint achieves a maximum tensile strength of 256.7 ± 8.2 MPa, corresponding to a 171 % enhancement over direct bonding (DB) joint (94.6 ± 5.1 MPa), accompanied by a fracture mode transition from brittle to ductile failure. Multi-scaled microstructure and interface element diffusion behavior analyses reveal that reactive diffusion at the W/MEA interface facilitates the formation of a solution-strengthened matrix associated with an amorphous diffusion layer. Whereas mutual diffusion at the Cu/MEA interface induces multiple phase structures, resulting concurrently in solid solution strengthening and precipitation strengthening, thereby reinforcing the interface bonding. This dual interface reinforcement methodology establishes an effective design strategy for enhancing mechanical properties in immiscible metal systems.
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MATERIALS CHARACTERIZATION
·
2025
·
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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LANGMUIR
·
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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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
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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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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Chemical Engineering Journal Advances
·
2025
·
IF 7.1
Tianhong Wang,Jiahui Xu,Anhong Cai,Jibo Xiao,Peng Wang,Min Zhao,Xianfeng Huang
Organic phosphonates detected frequently in water bodies pose severely environmental risks, and the cleavage of their C-P bonds to converse orthophosphate (PO 4 3- ) serves as a prerequisite step for achieving deep phosphorus elimination. Although the in situ generation of Cu(III) via Cu(II)/oxidant system for selective phosphonates degradation has been studied, the oxidation efficiency is constrained by sluggish Cu(II)/Cu(I) reduction, especially under acidic conditions. In this study, the introduction of UV irradiation accelerated the Cu(I)/Cu(II)/Cu(III) cycle in Cu(II)/peroxymonosulfate (PMS) process, enabling efficient and selective oxidation of 1,1-diphosphonic acid (HEDP, a typical phosphonate) into PO 4 3- across a wide pH range. UV-driven trace Cu(II)/PMS system can convert 90% of HEDP into PO 4 3- within 10 min at the pH range of 4-10, which was significantly higher than the conversion efficiency of HEDP by UV/PMS, Cu(II)/PMS and UV/Cu(II)/H 2 O 2 processes. The decomposition of HEDP was enhanced with increasing Cu(II) and PMS concentrations. Notably, mechanistic investigation revealed that Cu(III)-induced intramolecular electron transfer was the key contributor during the UV/Cu(II)/PMS-driven decomposition of HEDP into PO 4 3- . The experimental results of competitive ligands clearly suggested that the high selectivity of HEDP oxidation by UV/Cu(II)/PMS was closely related to the complexation of Cu(II) with HEDP. Additionally, although natural organic matter and inorganic anions to some extent affected HEDP degradation, UV-driven trace Cu(II)/PMS system still exhibited satisfactory results in treating HEDP in actual wastewater. This study proposes a strategy for efficient phosphonate removal under varying pH conditions, which provides new insights for practical wastewater treatment applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
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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