Catalysts
·
2026
·Vol. 16
·期 5
·402
·
IF 4.5
Lewa Zhang,Joseph Cao,Bowen Liu,Rongze Li,Bangwei Deng,Chenyuan Zhu
Electrocatalytic nitrate reduction to ammonia (NH3) offers a sustainable alternative to the Haber–Bosch process while enabling remediation of nitrate-contaminated water. However, the mechanistic origin of performance differences among bimetallic catalysts remains poorly understood, particularly regarding the metal-dependent evolution of reaction intermediates. Here, we construct a series of phase-pure tandem Cu–M catalysts (M = Co, Ni, Fe, Sn) by physically integrating commercial nanoparticles to examine the role of the secondary metal. In this architecture, Cu governs nitrate adsorption and its initial reduction to nitrite, whereas M dictates downstream hydrogenation toward NH3. Operando ATR–FTIR spectroscopy reveals that NH3FE is determined by the hydrogenation kinetics of nitrite-derived intermediates rather than nitrate activation itself. Among the examined systems, Cu–Co achieves optimal kinetic matching, enabling rapid nitrite consumption and continuous hydrogenation, delivering an ammonia Faradaic efficiency of 91.2% with minimal nitrite accumulation (~1.0%) and a yield rate of 0.86 mmol h−1cm−2at −0.5 Vvs. RHE. In contrast, Ni and Fe exhibit sluggish hydrogenation, while Sn induces pronounced intermediate buildup. These findings identify nitrite hydrogenation as the selectivity-determining step in tandem nitrate reduction and establish the chemical nature of the secondary metal as a decisive descriptor for rational catalyst design.
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CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Zhihan Hu,Tong Wang,Huimeng Feng,Zhipeng Zhao,Xiao Sun,Shougang Chen
Core-shell Cu-BTC@ZIF-8 enhanced hydrophobicity without sacrificing ethylene adsorption. • ZIF-8 shell provided water blocking while enabling ethylene transport. • HMDS/PDMS integration improved water resistance, filler dispersion and membrane processability. • Active packaging membrane with ethylene-scavenging, antibacterial activity, and improved water stability. Ethylene accelerates postharvest ripening and quality loss of fruits and vegetables even at ppm levels. Copper-based MOFs, such as Cu-BTC, can capture olefins via open metal sites (OMS) through π-complexation, yet water sensitivity and powder form limit their use in humid, air-based transport. Here, we report an ethylene-scavenging composite membrane developed through a processable material-design strategy involving structural protection, surface engineering, and membrane integration. A ZIF-8 shell is grown in situ on Cu-BTC to form a microporous protective interface that suppresses water ingress and mitigates water-induced OMS deactivation, while its known aperture flexibility associated with 2-methylimidazolate linker motion is incorporated into the design to maintain ethylene transport through the shell under humid air. In air at 25 ± 2 °C and 50 ± 5% RH, Cu-BTC@ZIF-8 exhibited an ethylene uptake of 35.97 cm 3 (STP) g −1 over 72 h, exceeding pristine Cu-BTC. An ultrathin HMDS-derived siloxane layer was subsequently introduced, and the particles were embedded in PDMS to further improve water resistance and convert the powder adsorbent into a processable membrane form with improved engineering applicability. In an 80 L sealed chamber under real air, the Cu-BTC@ZIF-8 + HMDS|PDMS membrane showed an ethylene removal capacity of 34.71 cm 3 (STP) g −1 over 72 h based on MOF mass and retained approximately 80% of its initial performance after ten 72 h cycles. In a 10-day banana storage experiment at 25 ± 2 °C, the composite membrane delayed visible browning by 3–4 days compared with blank and pure PDMS controls and showed inhibitory activity against E. coli and S. aureus . This work proposes a feasible material-oriented strategy to enhance the water resistance and processability of Cu-BTC-based MOF materials, while avoiding compromising ethylene adsorption performance under real-air conditions.
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Journal of Materials Chemistry C
·
2026
·
IF 5.1
Wenbo Wu,Tianyi Liu,Yaqun Han,Yue Wu,Suli Wu
Structural colors are generated by some different mechanisms. Here, we prepared a kind of large-area structural color films using Cu₂O@SiO₂ microsphere as the coloring units. The film is prepared by infusing PDMS into a disordered structural template assembled from Cu₂O@SiO₂ microsphere, followed by thermal curing and peeling. The disordered Cu₂O@SiO₂ thin layers embedded in the film are obtained by a spraying method, which can generate vivid noniridescent structural colors due to the strong Mie scattering of Cu₂O@SiO₂ microsphere. Meanwhile, Cu₂O@SiO₂-polydimethylsiloxane composite films show excellent chemical stability and mechanical properties. Dynamic tuning of the structural color is achieved by covering the film surface with a liquid layer, which modulates the interfacial medium environment and alters the relative refractive index contrast between the medium and the scattering units. Notably, when applied as structural color writing paper, the film demonstrates good reversible writing and erasing performance. The simple color-changing mechanism and ease of large-area fabrication make it a promising candidate for rewritable colored paper applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Zijian Yang,Jiacheng Peng,Qingwen Shi,Yuhan Wang,Jiawei Hong,Yong Yang,Yi Sun,Guoqiang Luo,Qiang Shen
Driven by the demand for cost reduction and enhanced performance in electronic applications, Cu@Ag bimetallic powders have attracted considerable attention as functional materials, requiring high electrical conductivity, excellent stability and environmental durability. This study uses ascorbic acid as the reducing agent and aqueous ammonia as the pH adjuster to prepare Cu@Ag bimetallic conductive powders under various ascorbic acid concentrations, pH values and temperature conditions. The results show that the powders form a protective silver shell through a layered growth mode. Crystal structure analysis reveals that the silver shell consists of hexagonal {111} planes and square {100} planes. These results suggest that the formation of this morphology may be associated with the synergistic effects of reduction kinetics and surface adsorption of ascorbic acid. Under alkaline conditions, a sufficient amount of ascorbic acid provides a strong reduction driving force and high nucleus supersaturation. In particular, its synergistic interaction with ammonia regulates Ag-species complexation, nucleation, and surface growth, thereby favoring the formation of layered structures. Non-equilibrium kinetic analysis and weatherability tests demonstrate that the as-prepared powders exhibited excellent oxidation resistance, short-term hygrothermal stability and acid resistance under the tested conditions. The conductive film exhibits a low resistivity of 70 μΩ·cm, 60% lower than that of the pure Cu film. This work mitigates the limitations in weatherability and conductivity caused by non-uniform and incomplete coatings through compositional and structural regulation. Meanwhile, the strategy improved Ag utilization efficiency and achieved enhanced performance at reduced Ag loading, providing a viable route for the controllable fabrication of low-cost, high-performance Cu@Ag conductive powders.
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Journal of the Iranian Chemical Society
·
2026
·Vol. 23
·期 8
·258
·
IF 2.4
Yu Haiyan,Zhang Li,Jia Yongpeng,Tian Ye
Two coordination polymers, CP1 and CP2, based on Cu(II) and Zn(II) ions, were synthesized and structurally characterized as fluorescent sensors for 1,10-phenanthroline, an important nitrogen-containing chelating agent widely used in coordination chemistry and industrial systems. Both materials exhibit good crystallinity, thermal stability, and intrinsic fluorescence. Their fluorescence sensing behaviors toward 1,10-phenanthroline were systematically investigated in aqueous media. CP1 and CP2 show high selectivity and sensitivity toward 1,10-phenanthroline, with Stern–Volmer constants of 1.11 × 10⁵ M⁻¹ and 6.95 × 10⁴ M⁻¹, and detection limits of 3.2 µM and 4.5 µM, respectively. In addition, both coordination polymers display good anti-interference ability and recyclability. Comparative studies reveal that the different sensing efficiencies of CP1 and CP2 are closely related to the distinct electronic properties of the Cu(II) and Zn(II) centers. Mechanistic investigations indicate that the fluorescence quenching mainly arises from coordination interactions between 1,10-phenanthroline and the metal centers. This work not only demonstrates the potential of coordination polymers as effective fluorescent sensors for phenanthroline detection, but also provides insight into the role of metal centers in regulating fluorescence sensing performance.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 22
·1771
·
IF 3.2
Zhang Enlei,Xu Zhiyi,Song Xiaowen,Wang Shuyuan,Zhang Bengui,Xie Yingpeng,Wang Guosheng
Hydrogen peroxide (H 2 O 2 ) detection is of great significance in environmental monitoring, food safety, and clinical diagnosis. Copper doping into α-FeOOH nanorods significantly enhanced the sensitivity and stability for electrochemical detection of H 2 O 2 . The structure and surface morphology of the products were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The electrochemical properties of CuFe 2 O 4 /α-FeOOH were studied by cyclic voltammetry and amperometry. The results showed that the composition and morphology of the as-prepared products were dependent on the Cu doping level. When the Cu doping level was up to 10 mol%, a spinel copper ferrite (CuFe 2 O 4 ) phase was formed in the product, accompanied by a morphological evolution into nanoparticles. The CuFe 2 O 4 /α-FeOOH/FTO (Fluorine-doped tin oxide) electrode exhibited excellent performance to detection of H 2 O 2 with high sensitivity (125.86 μA·mM −1 ·cm −2 ) and a low detection limit (0.56 μM, S/N = 3). Finally, the possible mechanism of the CuFe 2 O 4 /α-FeOOH catalysts for H 2 O 2 detection was analyzed and discussed.
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Carbohydrate Polymer Technologies and Applications
·
2025
·
IF 6.5
Yu Yao,Yuchen Lin,Hongwei Xi,Ruhao Han,Liangjie Tian,Yusheng Yang,Chonghe Cui,Yuhui Chen,Huimin Zhang,Ruixiong Chen,Wangan Li,Qingrong Lin,Rong Zeng,Yanjun Hu
s Currently, large segmental bone defects due to accidents, osteomyelitis debridement surgery, and other conditions, the treatments remain difficult. Large segmental bone defects are characterized by long treatment times, poor prognoses, and infectious complications. Although metal ions play crucial roles in directing bone tissue engineering, limited research has concentrated on ion-doped bacterial cellulose’s immunomodulatory properties. Therefore, we developed a mineralized bacterial cellulose (ZnCu-CaP-BC) biomaterial loaded with zinc and copper ions to enhance the bone immune environment and improve bone regeneration, as well as achieve anti-infection effects. The successful preparation of a mineralized bacterial cellulose biomaterial doped with Zn/Cu ions was confirmed by material characterization and biocompatibility experiments. Moreover, in vitro experiments demonstrated that the developed biomaterial has strong antimicrobial properties and can stimulate macrophages to improve the bone immune microenvironment by both reprogramming macrophages from the M1 to M2 phenotype and increasing the expression of alkaline phosphatase (ALP) and osteoclastogenic protein (OCN). The study performed in vivo experiments to further validate the bone-enhancing and antimicrobial properties of this biomaterial by using a rat femoral condylar defect and subcutaneous infection model. Overall, owing to the excellent antimicrobial, immunomodulatory, and bone-enhancing effects of ZnCu-CaP-BC, this material has great potential in the future.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Qiang Fang,Yunzhen Jia,Tao Zhao,Geng Li,Xuelei Lang,Ziyao Yang,Jianjun Ma,Dazhong Zhong,Jinping Li,Qiang Zhao
Acidic electrochemical CO 2 reduction (CO 2 RR) to high-value C 2+ products offers a promising route for CO 2 utilization. However, it still faces severe challenges: competitive hydrogen evolution reaction (HER) and slow C C coupling. To address these issues, we propose a defect engineering strategy by Fe-doped carbon nitride (FeCN) modification to reduce Cu defect formation energy, thereby inducing abundant and stable surface defects. We synthesized a magnetron-sputtered Cu nanoparticle (MSCu) catalyst modified with FeCN (MSCu-FeCN) and evaluated its performance in a membrane electrode assembly (MEA) under acidic conditions. At 500 mA·cm −2 , MSCu-FeCN achieves a remarkable C 2+ Faradaic efficiency (FE) of 73.07 % and a single-pass CO 2 conversion efficiency (SPCE) of 57.30 % with a full-cell voltage of 3.88 V, significantly superior to the original MSCu. Density functional theory (DFT) calculations, cyclic voltammetry curves, and in-situ attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy confirm that FeCN lowers Cu defect formation energy, increases surface defect density, enhances *CO intermediate coverage, thereby promoting C C coupling. This work presents a defect engineering approach enabling high-efficiency acidic CO 2 RR, while providing pivotal insights for industrial-grade electrocatalytic systems.
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PubMed
高影响因子
ACS Biomaterials Science & Engineering
·
2025
·
IF 5.5
Juan Huang,Mingjing Yang,Xingyu Zhou,Jigang Luo,Xiaoxia Yan,Guanghui Lin,Shijie Li,Shihui Liu,Zhuoyue Song,Chunzhi Tang,Nenggui Xu,Tao Liu,Jian Liang
Drug repurposing has received increasing attention in the field of oncology drug development as an alternative strategy to de novo drug synthesis. Disulfiram (DSF) has a long history of clinical application in alcohol withdrawal, and recent studies have revealed that its metabolite diethyldithiocarbamate (DDTC) can be coordinated with copper ions in vivo to form Cu-DDTC complexes with anticancer activity. However, the insufficient in vivo stability of DSF remains a challenge. In this study, the nanomedicine Cu-BTC@DDTC with DDTC-Cu(I) chemical valence and polycrystalline structure was prepared by incorporation of DDTC into the nanosized metal–organic framework (MOF) Cu-BTC. The in vitro cellular evaluation results showed that Cu-BTC@DDTC exhibited high inhibition of tumor cell growth, migration, and invasion. Animal experiments on the xenograft tumor model further demonstrated the excellent antitumor activity and biosafety of Cu-BTC@DDTC, and the antitumor activity was found to be closely related to the regulation of the SLC7A11/GPX4 signaling pathway to induce ferroptosis. This study provides a feasible option for antitumor drug development based on a drug repurposing strategy.
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ChemCatChem
·
2026
·Vol. 18
·期 2
·e01534
·
IF 3.9
Wenbin Huang,Haoran Liu,Han Yang,Zhen Xu,Tianyu Bai,Fan Shao,Yasong Zhou,Qiang Wei
To improve the efficiency of existing Cu-layered double oxide (LDO) catalysts for hydrogenation of CO 2 to methanol, graphene oxide (GO)-doped Cu-LDO/xGO catalysts were successfully prepared by coprecipitation method, and the influence of GO doping on the structure and reaction performance of Cu-LDO catalysts was deeply investigated. Characterizations including XRD, SEM, ICP-OES, N 2 physical adsorption-desorption, TEM, N 2 O chemisorption, H 2 -TPR, and H 2 /CO 2 -TPD reveal that optimal GO loading (2 wt%) promoted the formation of highly dispersed Cu particles and abundant Cu─MgO interfaces, enhancing H 2 adsorption/dissociation and CO 2 activation. The Cu-LDO/2.0GO catalyst achieved a CO 2 conversion of 22.4%, CH 3 OH selectivity of 94.5%, and methanol space-time yield (STY) of 652.1 g·kgcat −1 ·h −1 at 240°C and 2.5 MPa-outperforming the GO-free Cu-LDO/0GO catalyst, and long-term stability tests show that the incorporation of GO mitigated Cu sintering, maintaining catalytic activity over 200 h. The results of structure-activity relationship analysis show that the main reason 2 wt% GO doping significantly improved the activity and stability of the catalyst lies in the synergistic effect: GO improved Cu sites dispersion boosting H 2 activation and Cu─MgO interface formation. Meanwhile, GO can also act as a conductive bridge for H spillover, enabling hydrogenation of formate and other intermediates adsorbed on Cu–MgO interfaces that are not in direct contact with conventional Cu surfaces, potentially involving isolated Cu species. The study establishes that rational GO incorporation optimizes active site utilization, providing a strategy for designing efficient catalysts for CO 2 conversion. Graphical The incorporation of GO enhances the dispersion of the active metal Cu and increases the density of surface base sites in the catalyst, thereby accelerating the rate of methanol production via CO 2 hydrogenation.
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FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2016
·
IF 0.812
Liyuan Zhang,Yanfang Tai,Changpeng Lv,Chuanhu Wang
In this study, the water-soluble magnetic-multi-walled carbon nanotubes nanocomposites were fabricated via a facile and efficient approach and were characterized by X-ray diffraction, energy-dispersive X-ray, and transmission electron microscopy in detail. The nanocomposites could be employed as an effective adsorbent for removal of heavy metal ions, Cu(II) ions, from aqueous solution. It is noteworthy that the novel adsorbent displayed good water-dispersibility, rapid absorption rate, high absorption capacity, and convenient magnetic separation. Furthermore, the nanocomposites could be recovered and recycled for 10 consecutive trials without significant loss of its activity.
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Journal of Nanomaterials
·
2019
·Vol. 2019
·期 1
·1094308
·
IF 2.233
Ning Sui,Hongxu Gao,Yukai Wang,Jiali Li,Shiyu Qu,Qiang Bai,Hailian Xiao,Jing Sui,Manhong Liu,William W. Yu
A facile method to prepare Pt-Cu nanowires (NWs) was introduced. Structural characterization such as high-resolution transmission electron microscope (HR-TEM), selected-area electron diffraction (SAED), EDS element mapping, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and inductively coupled plasma mass spectrometry (ICP-MS) showed the formation of Pt-Cu alloy, with a width of 4.5 nm on average. The formation process of Pt-Cu NWs was studied; it was found that bromine ion, who has preferential adsorption on Pt (100) face, served as a growth-directing agent; Brij58 not only served as a protector but also played an important role in forming Pt-Cu NWs; the mechanism was proposed. Their electrocatalytic activity towards methanol oxidation was investigated; we found that the current density of Pt-Cu NWs was 295 mA·mg -1 when the ratio of Pt/Cu is 1 : 1, which is 11.5 and 2.35 times higher than that of pure Pt (26 mA·mg -1 ) and commercial Pt/C (126 mA·mg -1 ). The high electrocatalytic activity is attributed to the presence of abundant structural defects and surface active sites on the synthesized Pt-Cu NWs.
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