Journal of Materials Chemistry A
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2020
·Vol. 8
·期 19
·9545-9553
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IF 11.301
Tianhang Gu,Wei Teng,Nan Bai,Zehan Chen,Jianwei Fan,Wei-xian Zhang,Dongyuan Zhao
Bimetals have attracted considerable attention as electrocatalysts towards selective reduction of nitrate to benign dinitrogen. Design of highly efficient and stable bimetallic catalysts by taking the effects of both active sites increasing and synergistic composition into account is of paramount importance but still a grand challenge. Herein we report novel bimetallic Pd–Cu nanoparticles (NPs) incorporated in porous N-doped carbon octahedra prepared by a spatial confinement strategy of in situ pyrolysis of metal–organic frameworks with the assistance of polyvinyl pyrrolidone (PVP) as electrocatalysts achieving targeted denitrification. Pd–Cu NPs exhibit superior dispersity with a N-doped matrix and are strongly dependent on the variation of PVP, Pd precursor and pyrolysis temperature. The material shows high efficiency (∼97.1%) for the reduction of nitrate from 100 to 2.9 mg NO3−-N L−1 (well below drinking water standards of 10 mg NO3−-N L−1), and especially the selectivity over 83% for benign N2 at neutral pH within 24 h. Encapsulated and well-dispersed Pd–Cu NPs and doped N in the carbonaceous matrix synergistically enhance the interfacial electron transfer for transformation of NO3−-N(V). Porous structures endow the catalyst with outstanding stability after eight cycles and over a wide pH of 4–10. More importantly, the nanocatalyst performs well with real contaminated water (selectivity of 91% for nitrogen) in laboratory batch reactors. This nanocatalyst shows promise in wastewater treatment and environmental remediation due to the spatial confinement strategy and introduction of heterogeneous atoms.
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STAR Protocols
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2022
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IF 0
Xiaotong Li,Qian Liu,Jianghao Wang,Hao Bin Wu
Summary Heterostructured catalysts based on Cu and oxides are promising for the efficient conversion of CO 2 to multi-carbon products. In this protocol, we describe the fabrication and characterization of Cu/oxide heterostructured catalysts and the evaluation approach of electrochemical CO 2 reduction reaction (CO 2 RR) performance in an H-type cell. We also provide the details of in situ surface-enhanced Raman measurement and theoretical calculations. The protocol can be useful for constructing self-supported electrodes and assessing the CO 2 RR performance of as-fabricated electrodes. For complete details on the use and execution of this protocol, please refer to Li et al. (2022) .
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CRYSTENGCOMM
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2014
·Vol. 16
·期 38
·9075-9082
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IF 3.858
Shuling Xu,Haibo Li,Lei Wang,Qiaoli Yue,Sun Sixiu,Jifeng Liu
In this report, Ag@Cu yolk–shell nanostructures have been synthesized through a facile one-pot hydrothermal method. The synthesis is based on the use of N,N-dimethylformamide (DMF) as both the reducing agent and solvent, in the presence of the polymer poly(vinylpyrrolidone) (PVP). The structure and composition of the yolk–shell nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrometry (EDS). To study the formation process of the Ag@Cu yolk–shell nanostructures, the samples obtained at various stages of the growth process were studied by TEM and XRD, and a rational growth mechanism for the Ag@Cu yolk–shell nanostructures was proposed. The as-prepared Ag@Cu yolk–shell nanostructures were used to construct non-enzymatic glucose sensors. The detecting results show that the designed sensors have well-defined, stable and fast amperometric responses to glucose.
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Polymers
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2020
·Vol. 12
·期 4
·783
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IF 3.426
Ke Wang,Qian Ma,Yuanming Zhang,Shudong Wang,Guangting Han
In this study, Cu/Ag/polydopamine (PDA)/polyester (PET) fabrics were fabricated for multi-functional textiles. The PET fabrics were firstly modified by dopamine to form a polydopamine (PDA) layer on the fiber surface, then Ag nanoparticles (Ag NPs) were anchored on fiber surface through chelation between PDA and Ag+ions, and the Ag NPs were further used as catalytic seeds for in situ reduction of Cu nanoparticles (Cu NPs). The surface morphology, chemistry, and crystalline structure of the prepared PET fabrics were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). As expected, Cu NPs were evenly dispersed on the surface of fibers. The Cu/Ag/PDA/PET fabrics showed good antibacterial property againstEscherichia coliand exhibited excellent electromagnetic interference (EMI) shielding ability. The Cu/Ag/PDA/PET fabrics with high performance antibacterial and EMI shielding properties can be applied as functional protective textiles.Keywords:Cu NPs;Ag NPs;polydopamine;PET fabrics;antibacterial;electromagnetic interference shielding
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Ruonan Guo,Yiliang Zhu,Xiuwen Cheng,Junjing Li,John C. Crittenden
In this study, bimetal layered double hydroxides (Co x Cu y -LDHs) containing a carbonate interlayer were synthesized using coprecipitation with a variety of Co/Cu mole ratios. Meanwhile, the corresponding layered double oxides (Co x Cu y -LDOs) were prepared as controls. In this study, Electrical energy per order was performed to evaluate economic analysis. Correspondingly, we found that Co x Cu y -LDHs possessed a significantly better PMS activation capability than the corresponding metal oxide composite (Co 3 O 4 /CuO). Compared with other Co x Cu y -LDHs, Co 2 Cu 1 LDH possessed the best PMS activation capability for LOM degradation and the lowest electrical energy per order (EE/O) value during the reaction. Additionally, Co 2 Cu 1 LDH presented an excellent stability and worked over a wide pH range. The hydroxide states of Co(III), Co(II), Cu(I) and Cu(II) were all able to activate PMS, indicating that there were many active sites on the surface of Co 2 Cu 1 LDH. The involvement of radicals in this reaction system was determined via scavenger experiments and electron paramagnetic resonance (EPR). Meanwhile, it's worth noting that a mathematical model was developed to quantify the involvement of SO 4 − and OH. Subsequently, we determined PMS activation mechanism and LOM decomposition pathway for the PMS/Co 2 Cu 1 LDH system.
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CARBOHYDRATE POLYMERS
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2020
·
IF 7.182
Lumin Chen,Houyong Yu,Christopher Deutschman,Ting Yang,Kam Chiu Tam
We report a facile method to prepare a novel composite based on Fe-Cu alloy decorated cellulose nanocrystals (Fe-Cu@CNC) via simple oxidation-reduction reaction. Spherical zero-valent iron nanoparticles (NZVI) and sheet-like copper nanoparticles were serially anchored on the CNC surface, and the generated composite exhibited excellent antibacterial activities and highly efficient Pb 2+ removal. The composites had high antibacterial ratios of 95.9 %–99.9 %, because superoxide radicals can cause irreversible damage to the bacteria, eventually leading to apoptosis and bacterial death. Meanwhile, the Fe-Cu@CNC composite showed quick Pb 2+ ion removal, reaching a 70.76 % removal within 5 min, a total removal of 93.98 % after 1 h, and excellent reusability (retaining removal efficiency of 80.41 % after six cycles). The adsorption kinetics demonstrated that the adsorption behavior can be described by pseudo-second-order kinetic model (R 2 >0.99). This study offers a new strategy to prepare a promising composite with advanced antibacterial and heavy metal removal properties for wastewater treatment.
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TRIBOLOGY INTERNATIONAL
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2022
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IF 5.62
Yuhong Cui,Shenghua Xue,Xin Chen,Wei Bai,Shujuan Liu,Qian Ye,Feng Zhou
Herein, the MXene@Cu nanocomposites were prepared via electrostatic adsorption of Cu 2+ and then in-situ reduction. The Cu 2+ is uploaded on the surface of MXene nanosheets via electrostatic adsorption, which was followed by in-situ reduction with NaBH 4 to obtain Cu nanoparticle attached MXene (MXene@Cu) hybrids. The results revealed that the friction coefficient of MXene@Cu decrease from 0.434 to 0.110 and the wear volume loss decreased by 88.1% via changing the loading amount of Cu nanoparticles. The excellent tribological performance of MXene@Cu is attributed to the synergistic effect of MXene nanosheets and Cu nanoparticle , which can adsorb on the surface of friction pair and induce tribochemical reaction. A stable protective film is formed on the worn surface, thereby reducing fiction and wear.
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Journal of Energy Chemistry
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2025
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IF 14.9
Yaqing Hu,Mingxia Zhou,Kunyu Xu,Zihao Yang,Zhaoxia Dong
The electroreduction of carbon dioxide to multi-carbon products (C 2+ ) represents an effective pathway for achieving carbon cycling and high-density renewable energy storage. However, its practical implementation is challenged by excessively high C–C coupling reaction energy barriers and competitive hydrogen evolution reaction (HER). Modifications to the local microenvironment play a decisive role in the three-phase interface reaction of CO 2 electrocatalytic reduction. Therefore, this study employed an Al 2 O 3 -modified copper catalyst (Al 2 O 3 /Cu) to modulate the local reaction microenvironment, thereby promoting C 2+ formation. Notably, the optimized Al 2 O 3 /Cu catalyst achieved a remarkable C 2+ Faraday efficiency (FE) of 71.3% at −1.33 V vs. RHE (reversible hydrogen electrode; all potentials herein are referenced to RHE) in a neutral electrolyte using a flow cell, significantly outperforming unmodified Cu catalysts. This catalyst also demonstrated excellent catalytic stability, exceeding 56 h. Theoretical calculations and in situ spectroscopic characterization confirmed that introduced Al 2 O 3 species kinetically facilitate water dissociation and proton consumption, which is crucial for maintaining a transient localized high-pH environment under operating conditions. This alkaline microenvironment not only suppresses the HER but also stabilizes the critical Cu 2+ /Cu + active sites against over-reduction, while simultaneously lowering the energy barrier of C–C coupling reactions. This work underscores the critical role of dynamically modulating the localized chemical environment in neutral electrolytes for CO 2 reduction reactions (CO 2 RR), offering novel insights for designing such microenvironments.
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Yi Wang,Jiaxin Liu,Qixin Wang,Yuan Xu,Qianling Zhang
The electrocatalytic nitrate reduction reaction (NO 3 − RR) is a promising and economic green alternative to the traditional Haber-Bosch process for ammonia (NH 3 ) production. However, it suffers from high overpotential and poor NH 3 selectivity due to various competing reactions. In this study, we developed a CuO/Co 3 O 4 nanoneedle heterostructure catalyst grown on nickel foam. After electro-activation to Cu/Co 3 O 4 , it achieved nearly 100 % NH 3 selectivity in both alkaline and neutral electrolytes across a wide range of potentials. The catalyst showed a high NH 3 yield rate of 617.14 μmol h −1 cm −2 at −0.2 V vs. reversible hydrogen electrode along with an excellent stability over a 120-hour test. The mechanism involves CuO reducing to Cu, forming a heterostructure that modifies the electronic environment of Co sites, the synergistic Cu and Co 3 O 4 interfaces enhancing rapid *NO 3 adsorption and lowering the energy barriers for NH 3 production, thereby facilitating the overall efficiency even at low concentrations (0.01 M NO 3 − ).
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MATERIALS CHEMISTRY AND PHYSICS
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2025
·
IF 4.7
Haozhe Pang,Shimao Shangguan,Ya Chen,Yue Zhang,Siyuan Fan,Lida Shen,Zongjun Tian,Zhidong Liu
Bronze, as a solid self-lubricating material, is widely used in various frictional applications. However, under increasingly common high-frequency and high-load conditions, particularly in the absence of lubricants, bronze layers are prone to rapid wear. Incorporating MoS 2 particles to fabricate solid self-lubricating composite coatings is considered a promising approach to improve overall performance in harsh environments. In this study, a friction-assisted jet electrodeposition process is employed to fabricate Cu-Sn-MoS 2 composite coatings. This technique enhances particle embedding and surface leveling, producing uniform and dense coatings with significantly improved tribological performance. The methodological framework of this study involves the fabrication of Cu-Sn-MoS 2 composite coatings via friction-assisted jet electrodeposition, followed by systematic characterization of their surface morphology, microhardness, adhesion, and tribological behavior. The results show that a MoS 2 content of 5 g/L provides a uniform and compact surface with fine grains, sufficient microhardness and adhesion strength, and a continuous lubricating film formed during wear. The wear mechanism was revealed to explain why the Cu-Sn-MoS 2 coating exhibited a strong performance in mechanical properties and wear resistance. This content achieves the lowest friction coefficient and the best wear resistance among all tested compositions.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Yaqi Wu,Jianhua Qian,Yanan Wang,Jinjuan Xing,Junhua Li,He Huang,Xueming Kang,Jiasheng Xu
Developing transition metal oxide-based catalysts with both high thermal stability and catalytic activity for the effective volatile organic compounds (VOCs) removal remains a major challenge in heterogeneous catalysis. In this work, a series of Cu, Mn, Co and Ni substituted Co 3 O 4 spinel catalysts with a large number of oxygen vacancies were produced as extremely stable and active substances for the oxidation of toluene. The CuCo 2 O 4 catalyst, prepared through transition metal substitution, demonstrated exceptional performance with T 50 , T 90 , and complete conversion temperatures of 204 °C, 220 °C, and 228 °C, respectively. Furthermore, the CuCo 2 O 4 catalyst displayed markedly enhanced thermal stability compared to other catalysts, which was crucial for practical implementation. Its superior catalytic activity originated from electron transfer between Co and Cu cations, facilitated by lattice oxygen, which increased the Co 3+ /Co 2+ ratio. This structural modification strengthened oxygen migration and reducibility within the spinel framework, facilitating efficient regeneration of lattice oxygen and rapid activation of adsorbed oxygen species. Kinetic analyses corroborated these findings, revealing that CuCo 2 O 4 possessed the lowest activation energy ( E a = 40.40 kJ/mol), thereby reducing the energy barrier for toluene oxidation. These results demonstrate that the CuCo 2 O 4 catalyst represents a promising candidate for practical applications, combining high catalytic activity for toluene oxidation with exceptional operational durability and thermal stability.
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JOURNAL OF MATERIALS SCIENCE
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2025
·
IF 3.9
Fang Qi,Luo Chongwen,Guo Xiaohuan,Cai Bingbing,Zhou Yuzhu,Hu Kun,Wen Changchun
Chemodynamic therapy (CDT) uses the Fenton reaction to generate highly toxic hydroxyl radicals (∙OH) to achieve efficient treatment strategies for tumors. However, the high concentration of glutathione (GSH) in the tumor microenvironment (TME) can scavenge these radicals, thereby diminishing the efficacy of CDT. In this study, we propose a programmable synergistic therapeutic strategy that depletes GSH during chemotherapy (CT) and subsequently increases the production of reactive oxygen species (ROS) to achieve high-potency CDT. We constructed a Cu-Q@Co/ZIF-8 (CQZ) composite nanoplatform by encapsulating cobalt-doped ZIF-8 (Co/ZIF-8) with copper-quercetin (Cu-Q, CQ). The construction of nanoplatform significantly enhanced the water solubility of Co/ZIF-8 and CQ. When the nanoplatform reached the tumor site, the TME triggered the release of quercetin and Cu 2+ from CQ, thus enabling quercetin-based chemotherapy and Cu 2+ -mediated GSH depletion while generating Cu + . Subsequently, the Co 2+ released from Co/ZIF-8 acted with Cu + to catalyze a Fenton-like reaction with endogenous H 2 O 2 , efficiently producing toxic ∙OH radicals for CDT. Throughout the treatment process, Cu 2+ was preferentially released in response to the TME to consume GSH, not only generating Fenton-active Cu + but also preventing the GSH-mediated scavenging of ∙OH. This procedural mechanism has substantially enhanced the therapeutic efficacy of CDT following CT.
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