JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Yiping Tang,Huanle Zhang,Jiquan Li,Guangya Hou,Huazhen Cao,Liankui Wu,Guoqu Zheng,Qingliu Wu
A novel three-dimensional ordered macroporous (3DOM) Cu/Fe 3 O 4 composite film was prepared by electrodepositing ferroferric oxide (Fe 3 O 4 ) on the 3DOM Cu current collector. Characterizations via electron microscopies and X-ray diffractions confirmed that achieved 3DOM Cu/Fe 3 O 4 composite inherited originally ordered porous structure, but has a layer of nanosized Fe 3 O 4 on the surface of the 3DOM Cu framework. The obtained 3DOM Cu/Fe 3 O 4 composite films were directly used as anodes of lithium ion batteries in the absence of conducting additives or binders. Results from electrochemical evaluations exhibited that the 3DOM Cu/Fe 3 O 4 anode could deliver a stable capacity of 800 mAh g −1 up to 400 cycles, while fast capacity degradation with 200 mAh g −1 retained after 100 cycles was observed on Fe 3 O 4 deposited on plane Cu substrate. The superior behavior of the 3DOM Cu/Fe 3 O 4 composite anode is ascribed to its unique porous structure, which provides sufficient space for large volume change of Fe 3 O 4 and greatly reduces the diffusion distance for Li-ion in the active material.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yongzhen Dong,Jiawei Liu,Liqin Kong,Dongyang Deng,Long Wu,Yiping Chen
This study presents the development of a magnetic relaxation switching (MRS) immunosensor for the sensitive detection of chlorpyrifos (CPF) with a signal amplification strategy using Pd/Cu-TCPP(Fe) hybrid nanosheets and polydopamine (PDA). Pd/Cu-TCPP(Fe) nanosheets, which exhibit high peroxidase-like activity and excellent storage stability, making them suitable replacements for natural enzymes in biosensors, are further functionalized with goat anti-mouse IgG (Ab 2 ) to construct an immunosensor. The mechanism relies on the competition between free CPF and the immobilized bovine serum albumin-CPF conjugates for antibody binding, which modulates the aggregation of magnetic nanoparticles (MNPs) that are related to the transverse relaxation time. The optimized immunosensor shows a linear detection range from 0.5 ng/mL to 100 ng/mL and a limit of detection (LOD) of 0.24 ng/mL, outperforming traditional enzyme-linked immunosorbent assay (ELISA) methods by achieving an LOD that is about 9 times lower. Real sample analysis demonstrates the applicability of the Pd/Cu-TCPP(Fe)-PDA-MRS immunosensor for detecting CPF residues in tomato and water samples, with results well consistent with those obtained using gas chromatography. This work highlights the potential of nanomaterials in enhancing the performance of MRS immunosensors for pesticide residue analysis in environmental and food safety monitoring.
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Processes
·
2024
·Vol. 12
·期 9
·1912
·
IF 2.8
Bowen Lu,Huiying Sang,Liang Liu,Zhijian Yu,Yaqin Guo,Yongqing Xu
The catalytic applications of micron Cu powder are limited due to its large particle size and small specific surface area. Modifying micro-Cu powder to achieve a high catalytic performance is a challenge in the application of micron copper. In this work, micro-Cu was used to synthesize a CeO2–Cu catalyst, and the phase composition and surface pore structure were analyzed using XRD, BET, etc. The CO2hydrogenation performance of the CeO2–Cu catalyst was analyzed in comparison with CeO2and Cu, and we found that the CeO2–Cu catalyst exhibited a synergistic effect between Cu and cerium, resulting in a much higher hydrogenation performance at 500 °C than CeO2or Cu alone. H2-TPR and TEM characterization revealed that the CeO2–Cu catalyst formed interfacial interactions with a relatively large Ce–Cu interface, where cerium oxide could promote the reduction of CuO and lower the reduction temperature. Additionally, cerium oxide formed a confinement structure for Cu, and the CeO2–Cu catalyst exhibited a higher oxygen vacancy concentration, thereby promoting the CO2hydrogenation performance. Cu–CeO2interaction provides valuable insights into the catalytic application of micron Cu powder.
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Materials Today Communications
·
2024
·
IF 3.7
Guoan Zeng,Shichao Liao,Jinkun Liu,Yan Zhu,Toshiki Miyazaki
The germ-killing functions of silver and copper nanoparticles (NPs) were worthy of biomedical applications, but as heavy metals, NPs need to be more antimicrobial at lower doses to minimize hazards to human health, which requires more explorations on the new structures resulting from the compositing between two metals. In this study, self-assembled Cu-Ag bimetallic NPs were synthesized using a two-step reduction method. Results showed that both the Cu and Ag in Cu-Ag NPs existed as pure phases, the nanoparticles comprised ∼5 nm primary particles that self-assembled into ∼50 nm secondary particles surrounded with carbon-chain coatings. The larger secondary particles provided Cu-Ag with good particle dispersibility and chemical stability against deeper oxidation above ∼360 °C, while the smaller primary particles facilitated their suspensions in achieving a maximum inhibition ring of 10.01±0.25 mm and a minimum optical density (OD) of 0.11±0.01. Cu-Ag NPs demonstrated superior antimicrobial performance against all target strains, exhibiting synergistic enhancement through released active ions and reactive oxygen species (ROS). Cell viability ranged from 74.4 % to 95.4 % after co-culturing for 24 h, confirming that all synthesized nanometals were non-toxic to L929 cells at most concentrations. Increasing the suspension concentration enhanced antimicrobial activity while reducing cell viability. This conflict established an optimal Cu/Ag ratio of 10:4 and a concentration of 4 μg/mL, allowing Cu-Ag NPs to perform both broad-spectrum bactericidal activity and cell safety.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yi Li,Shiyin Ji,Yangzhou Fan,Tao Duan,Youkui Zhang
The Haber-Bosch process for ammonia synthesis is energy-intensive and environmentally damaging, while nitrate wastewater poses risks to both the environment and human health. Utilizing electrochemical method could remove nitrate in the sewage and a part of nitrate would been reduced to ammonia provided a highly efficient approach for nitrate removal and ammonia synthesis. In this study, incorporated Cu and Co on boron-nitrogen-doped graphite (BCN) substrate with eminent conductivity synthesized BCN-CuCo catalyst. On the catalyst, Cu and Co gave rise to synergistic effect which aroused charge redistribution between Cu and Co, which facilitated the nitrate adsorption, accelerated catalytic kinetics for nitrate reduction. BCN-CuCo catalyst demonstrated eminent performance for nitrate reduction, achieving a high Faradic efficiency of 95.8 % at −0.46 V vs RHE and an impressive ammonia yield rate of 12321.6 μg h −1 mg cat -1 at −0.86 V vs RHE in 0.5 M H 2 SO 4 with 0.1 M KNO 3 . It also showed excellent performance in HNO 3 and neutral media, expanding its application scope. Ultimately, the BCN-CuCo facilitated the production of 320 mg of ammonium diuranate in a neutral medium, supporting sustainable resource utilization. This research provides an efficient strategy for ammonia synthesis and introduces a method for recycling resources from uranium and nitrate-contaminated wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Ya Xu,Jihong Zhou,Peng Sun,Ping Li,Dongxue Han,Xiaohong Wang,Fang Chai
Artificial mimic enzymes have attracted wide attention for their superior characteristics to natural enzymes in extensive applications of diagnosis and therapy. In this paper, a nanozyme Cu-BDC@FeMo 6 was designed and fabricated by embedding polyoxometalate (NH 4 ) 3 [FeMo 6 O 18 (OH) 6 ]·6H 2 O (FeMo 6 ) into a copper-based metal–organic framework (Cu-BDC). The integration of FeMo 6 and Cu MOF based on the synergies of oxidability of FeMo 6 and oxygen-driven reversible Cu + /Cu 2+ enhanced the peroxidase mimicking activity, which accomplished the sensitive visual monitoring of H 2 O 2 and dopamine (DA). The detection of H 2 O 2 was driven by Cu-BDC@FeMo 6 catalyzing the oxidation of TMB with colorimetric evolution to blue, and consecutive monitoring DA via the reverse process of reduction of ox-TMB was further achieved. The limit of detection (LOD) of H 2 O 2 and DA were 10 μM and 2.27 μM, with excellent stability, and outstanding selectivity. The mechanism of the catalysis was further evaluated, and the generation of O 2 · - played a crucial role in the catalysis for oxidation. The logic gate design was constructed to illustrate the process and application. This work provides a feasible reference for the reasonable design of simulated enzyme in biosensor applications.
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ChemistrySelect
·
2024
·Vol. 9
·期 46
·e202404170
·
IF 1.9
Pengtao Sheng,Haiyan Xu,Yaqi Zhang,Haiyue Xia,Haipeng Liu,Weili Li
Graphical We present a surfactant-associated controlled synthesis of copper (Cu)-deficient zinc (Zn)-doped Cu-indium (In)-selenium (Se) QDs, followed by a mechanistic investigation of their photophysical properties using surfactants. The findings described here are expected to provide a general strategy for enhancing the tunability of photophysical properties in other QDs systems. The shape and size-controlled synthesis of colloidal I−III−VI quantum dots (QDs) can be attained only by a few synthesis strategies via the introduction of various high-boiling-point organic surfactants. To further investigate this strategy, in this study, we present a surfactant-associated controlled synthesis of copper (Cu)-deficient, zinc (Zn)-doped Cu─indium (In)─selenium (Se) QDs, followed by a mechanistic investigation of their photophysical properties using surfactants, such as oleylamine (OLA), oleic acid (OA), and diphenylphosphine (DPP). OLA significantly promoted the quantum size effect-resultant emission wavelength red-shift, while OA controlled the homogeneous growth of QDs and improved the quantum yields. Moreover, Gaussian deconvolution of the photoluminescence spectra and the bandgap derived from the absorption spectra, by fitting, supported the fact that the radiative transition channels, especially for surface-trap-state-related transitions, are also dependent on the surfactants. Specifically, the conduction band electron-intragap state transitions and donor-acceptor transitions were present in all the prepared samples but accounted for different percentages. Furthermore, the surface-trap-state-related transitions significantly faded upon adding (i) OLA/OA as the sole surfactant to the cationic precursor and (ii) the OA + OLA + DPP mixture to the anionic precursor. The findings described here are expected to provide a general strategy for enhancing the tunability of photophysical properties in other QDs systems.
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Journal of Materials Chemistry C
·
2025
·
IF 5.1
Shuang Xu,Lei Yang,Congya Wang,Liwei Pan,Jing Zhang,Yaling Wang,Hexiang Zhong
With the rapid development of industry, large-scale fossil energy consumption leads to the increase of atmospheric CO2 concentration and the resultant deteriorating global warming. The electrochemical reduction of CO2 (ERCO2) technology is a potential strategy to achieve the CO2 emissions reduction and to realize carbon recycling. However, the lack of high product selective, active and stable catalysts is one of the remaining challenges for the industrial applications of ERCO2. Herein, an electrochemical oxidation-reduction reconstruction method is developed to reconstruct the copper network without extra Cu salt addition obtaining Cu2O-Cu (111) catalysts with nanoporous structures for improving the selectivity and activity of CH4 and C2H4 product. The oxidation-reduction reconstruction derived catalyst achieves improved faradaic efficiency of 56.63% for CH4 product and a partial current density of 41.6 mA cm-2 at -1.38 V (vs. RHE). The selectivity and activity toward C2H4 are also improved. The catalytic superiority originates from synergistic interplay between the Cu₂O-Cu heterogeneous interface and high electrochemical active surface area. Additionally, the presence of abundant oxygen vacancies at the Cu2O-Cu interface accelerate the electron transfer process and promote the high selectivity and activity toward CO2-to-CH4. This study paves a new way for enhancing the selectivity and activity of CO2 electrocatalytic conversion to CH4.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Deng Huiying,Liu Tingting,Zhao Wenshan,Wang Jundong,Zhang Yuesheng,Zhang Shuzhen,Yang Yu,Yang Chao,Teng Wenzhi,Chen Zhuo,Zheng Gengfeng,Li Fengwang,Su Yaqiong,Hui Jingshu,Wang Yuhang
CO 2 electroreduction is a potential pathway to achieve net-zero emissions in the chemical industry. Yet, CO 2 loss, resulting from (bi)carbonate formation, renders the process energy-intensive. Acidic environments can address the issue but at the expense of compromised product Faradaic efficiencies (FEs), particularly for multi-carbon (C 2+ ) products, as rapid diffusion and migration of protons (H + ) favors competing H 2 and CO production. Here, we present a strategy of tuning the 2-position substituent length on benzimidazole (BIM)-based copper (Cu) coordination polymer (CuCP) precatalyst – to enhance CO 2 reduction to C 2+ products in acidic environments. Lengthening the substituent from H to nonyl enhances H + diffusion retardation and decreases Cu-Cu coordination numbers (CNs), favoring further reduction of CO. This leads to a nearly 24× enhancement of selectivity towards CO hydrogenation and C-C coupling at 60 mA cm −2 . We report the highest C 2+ product FE of more than 70% at 260 mA cm −2 on pentyl-CuCP and demonstrate a CO 2 -to-C 2+ single-pass conversion (SPC) of ~54% at 180 mA cm −2 using pentyl-CuCP in zero-gap electrolyzers.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kai Liu,Qikui Fan,Zhun Qiao,Zhixue Zhang,Yongzhao Zhang,Zhiqun Chen,Hao Ma,Zemin He,Zongcheng Miao,Jiaofei Huo,Duqiang Xin,Jianxin Guo,Chuanbo Gao
Plate-like metal nanomaterials have attracted much interest due to their anisotropy, high aspect ratio and large surface area. The synthesis of non-noble metal nanocrystals with high purity remains challenging due to the poor regulation mechanism of their seeds, which limits their property and application studies. This paper presents a selective etching mechanism that effectively facilitates the identification and dissolution of non-target seeds during the synthesis of Cu nanoplates. This innovative approach not only enables the production of highly pure nanoplates but also allows for the shape transformation of nanoparticles into nanoplates. The resulting Cu nanoplates exhibit tunable localized surface plasmon resonance (LSPR) characteristics and high enhanced performance in surface-enhanced Raman scattering (SERS). This method offers a novel approach to the synthesis and purification of metal nanocrystals.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Minghan Yu,Jiayun Feng,SenPei Xie,Yiping Wang,Yongsheng Li,Runze Wang,Guofeng Lu,Kang Li,Rui Wu,Weiwei Zhao,Yanhong Tian
This paper introduces a method to synthesize thick-shell Cu@Ag particles, with nanorod-shape silver wrapped on the copper surface after substitution and reduction reactions. The average size of silver nanorods is less than 50 nm and that of the copper particles is about 1 μm. The surface morphology, structure, and sintering properties of Cu@Ag particles were characterized in detail. The results show that the sintering temperature of thick-shell Cu@Ag is 127.5 °C, which is lower than that of Cu@Ag particles covered with island-shape and block-shape silver nanoparticles. The conductive ink was prepared by mixing it with resin paste, and the bulk conductivity of the conductive paste under different sintering conditions was investigated. The optimal -process parameters were chosen to conduct the printing of radio frequency identification (RFID) antennas. The farthest reading distances achieved by the ultra-high frequency RFID (UHF RFID) and the high-frequency RFID (HF RFID) were 9.4 m and 3.5 cm, respectively, which have good prospect of practical application.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-14
·
IF 15.7
Zhang Fanxing,Cao Ning,Wang Chentao,Wang Shengxiang,He Yi,Shi Yao,Yan Mi,Bao Ying,Li Zhenglong,Xie Pengfei
Electrochemical CO 2 -to-ethanol conversion is challenged by sluggish C-C coupling kinetics and wide products distribution. Although Cu + has been demonstrated to enhance multi-carbon (C 2+ ) formation, the stabilization of Cu + under reduction conditions is difficult. Here, we report a hydrogen-ethanol pretreatment strategy to obtain Cu nanoparticles covered by highly dispersed and disordered ZnO 1- x clusters. Ethanol-induced ZnO 1- x redispersion gives rise to abundant Cu + on the subsurface. The optimal catalyst delivers a 73.0% ethanol Faradaic efficiency (FE) and 86.0% total C 2+ FE at −0.9 V, with a 2.3 mmol cm −2 h −1 ethanol formation rate and single-pass ethanol yield of 18.0%. The catalyst also exhibits stability beyond 500 h, attributed to the stabilization of Cu + by the ZnO 1- x shield that requires a high energy barrier for lattice oxygen removal. In situ X-ray spectroscopy and calculations reveal a volcano relationship between Cu + ratio in Cu species and ethanol FE. Optimal Cu + density not only facilitates *OC-COH coupling but also optimizes the adsorption energy of *CH 2 CH 2 O on catalyst for ethanol electrosynthesis.
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