ACS Catalysis
·
2024
·
IF 11.3
Long Cheng,Rong Wang,Wenzhe Si,Yanxi Deng,Junhua Li,Yue Peng
Cu-based catalysts leveraging Cu+/Cu0 active sites have emerged as pivotal for synthesizing essential hydrocarbons and alcohols in electrochemical CO2 reduction, such as ethylene and ethanol (C2 products). However, the dynamic reduction of Cu+ to Cu0 during electroreduction leads to site instability, resulting in diminished efficiency for CO2 conversion to C2 products. Herein, we introduced Si into CuO by the selective dissolution method, engendering Cu–O–Si units to stabilize the Cu+/Cu0 sites. The catalyst manifested good activity in CO2 electroreduction with an elevated Faradaic efficiency for C2 products reaching 81.9% at −100 mA/cm2. After ten cycles of electrochemical testing, the Cu+/Cu0 sites and performance exhibited no signs of degradation. The Si incorporation significantly improved the hybridization of O 2p and Cu 3d orbitals, thereby reinforcing the Cu–O bonds and stabilizing the Cu+/Cu0 sites, which was critical in promoting C–C coupling via decreasing the energy barriers for *OCCO formation and enhancing C2 product selection. The active Cu+ cations with unsaturated coordination contributed to the reaction stabilization, thereby improving the preservation of Cu2O metastable state.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Huixian Weng,Danyang Liu,Shujiang Geng,Gang Chen,Fuhui Wang
Cu/Ni dual-layer coating is applied to improve the performance of SUS 430 steel as solid oxide fuel cells (SOFCs) interconnects. Cu layer is deposited by electroplating, followed by magnetron sputtering Ni layer on top of Cu layer. The coated steels are evaluated in air at 800 °C in correspondence with SOFC cathode environment. Results showed that a considerable amount of Ni diffuses into the steel substrate, while Fe and Cr diffuse from the steel substrate into the coating during the initial oxidation. A (Ni,Fe) 3 O 4 spinel layer is initially formed on the scale surface. Cu diffuses outwards and eventually dopes into (Ni,Fe) 3 O 4 spinel to form (Ni,Fe,Cu) 3 O 4 spinel. The oxide scale evolved into a dual-layer structure of an inner Cr 2 O 3 layer and an outer layer of NiO mixed with spinels after 5 weeks of oxidation. Preoxidation treatment in 800 °C air for electroplated Cu coated steel prior to depositing Ni layer improves oxidation resistance and significantly decreases Cr outward diffusion after 5 weeks of oxidation. Moreover, the oxide scales formed on both Cu/Ni and CuO/Ni coated steels maintain low area specific resistance (ASR) after 5 weeks of oxidation.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Mingming Luo,Fang Li,Panpan Dong,Yijun Tan,Ruowei Liu,Longping Xu,Pei Zhao,Zijian Wu
Kanamycin (KANA), a widely used antibiotic associated with foodborne disease, requires accurate monitoring solutions. This study presents a novel ultrasensitive electrochemical aptasensor for KANA quantification using a signal amplification method. The sensing platform was constructed with Cu/Al-MOF@Ti 3 C 2 nanocomposites as the support and incorporated aptamers specifically recognizing KANA. Among them, Cu/Al-MOF provided a high specific surface area for anchoring a large number of aptamers, Ti 3 C 2 was used to enhance the conductivity of the aptasensor, the aptamers have been used for the improvement of the sensitivity of the aptasensor, and the insertion of Cu/Al-MOF into Ti 3 C 2 sheets effectively prevents stacking between Ti 3 C 2 sheets. In the context of KANA, the specific recognition of the aptamer led to a decrease in the electrochemical signal. Under optimal conditions, the logarithm of the electrochemical output signal versus KANA concentration was linear over the range of 10 fM to 100 nM with a limit of detection (LOD) of 0.74 fM. In addition, the aptasensor showed excellent accuracy and high reproducibility and has been successfully employed in actual samples, enabling the detection of a wide range of targets by simply replacing the matching aptamer.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Qing-Shuai Zhang,Yu-Le Wang,Li Yue,Yu-Dong Shan,Song-Hai Wu,Yong Liu,Xu Han
Although selective oxidation of benzene to phenol (SOBP) by H2O2 is an important chemical process, overoxidation of benzene by the produced nonselective •OH during the activation of H2O2 inevitably reduces the oxidation selectivity. We, therefore, attempt to mediate the oxidation selectively by using electrophilic KHCO3 in the oxidation system. In this study, Mo–Cu/NC has been successfully synthesized via ball-milling bimetallic Mo–Cu and N-doped carbon, which exhibits high reactivity in SOBP by H2O2 and KHCO3 with a desirable phenol yield of 25.1% and selectivity of 100%. A series of characterizations and DFT calculations reveal that the reaction between H2O2 and KHCO3 produces HCO4–, which is then moderately activated on Mo1Cu2/NC via the nonradical pathway with the formation of Mo-(η2-O2) peroxo. Meanwhile, Ov at Mo1Cu2/NC facilitates the adsorption of benzene, which is then selectively oxidized by Mo-(η2-O2) peroxo to phenol via the oxygen atom transfer pathway. This study provides new insights on the importance of Mo-(η2-O2) peroxo mediated by H2O2–KHCO3 in selective oxidation of aromatic C–H bond via the nonradical pathway.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiawei Li,Zejing Chu,Shimeng Wang,Haipeng Liu,Biao Dong
Photodynamic antibacterial based on metal organic framework (MOF) structure shows broad application prospects. But it is limited by the problem of hypoxia in the bacterial microenvironment. The oxygen-producing nanozyme strategy is the key to solving the problem. In this work, MnO 2 oxygen-producing nanozyme was introduced on the basis of the metal organic framework Cu-TCPP to obtain Cu-TCPP@MnO 2 , which can produce oxygen synchronously during PDT. Moreover, under the excitation of 660 + 808 nm dual laser irradiation, the synergistic treatment of PDT, CDT and PTT was achieved. In the in vitro antibacterial experiment, the inhibition rate of Cu-TCPP@MnO 2 against Staphylococcus aureus under dual laser excitation can reach 99.9 %, and the biofilm removal rate is close to 80 %. The inhibition rate of Escherichia coli is also as high as 99.5 %. In the in vivo treatment of mouse models, the wound area was only 2.39 % after 13 days, achieving efficient sterilization, controlling inflammation and promoting tissue repair. This synergistic antibacterial strategy has shown remarkable effects in wound healing giving the material great potential for medical applications.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Dan Huang,Ling Li,Siqi Wei,Kaixi Yin,Wenjuan Shang,Xiandeng Hou,Li Wu
Heterogeneous bimetallic materials have attracted widespread concern in surface-enhanced Raman scattering (SERS) since the interactive coupling between these heterogeneous zones produces a synergistic enhancement effect. Developing a quick and easy method to prepapre bimetallic materials with superior SERS properties is therefore very important. A novel approach of electrodeposition followed by the galvanic replacement reaction (GRR) was proposed for fast fabricating copper-silver bimetallic heterogeneous dendrites on nickel foam (Cu-Ag dendrites@NF) as a stable SERS substrate. The morphology and compositions of the dendritic structure were well characterized by SEM, and XPS imaging provided a micro-area composition analysis. The metallic Cu-Ag dendrites exhibited better SERS enhancement performance than the pure metal, with an enhancement factor of 37 times that of the pure Ag cubes@NF, and 6 times that of the Ag dendrites@NF. The reason is that both the synergistic effect of plasmon coupling from bimetal Cu-Ag and the dendritic structure with large surface area and cusps contributed to electromagnetic enhancement. The substrate was successfully used for the detection of pesticide thiram, dye molecule crystal violet (CV), and toxic aromatic amines p-Aminoazobenzene (pAAB), with limits of detection (LODs) down to 10 −8 M, 10 −9 M, and 10 −8 M, respectively. This method provides a novel fast approach to fabricate a bimetallic substrate with high SERS activity, and may have broad applications in food analysis and environment monitoring.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Haifeng Zhang,Ziyi Liu,Zhi Xu,Chunying Teng,Wei Chen,Lanhe Zhang,Jian Zhang
The Fenton-based oxidation process is an effective wastewater treatment approach for degrading organic pollutants. However, it has limitations in terms of pH range and secondary pollution. Cu(II)-mediated Fenton-like oxidation presents a promising alternative for applications. In this work, experimental approaches were integrated with kinetic modeling analysis to understand the production, performance and reaction mechanism of active species during the Cu(II)/H 2 O 2 process. Chemical probe analysis and electron paramagnetic resonance information verified the presence and properties of ·OH and Cu(III) in the Cu(II)/H 2 O 2 process. By using the periodate colorimetric technique, the relationship between reaction conditions and the generation of Cu(III) was further clarified. Together with theoretical analysis, the contribution of ·OH and Cu(III) to the elimination of bisphenol A (BPA) in the Cu(II)/H 2 O 2 process was examined. Quantitative analysis demonstrated that ·OH played a pivotal role under acidic conditions, accounting for 54.06 % and 62.06 % of BPA removal at pH 4 and 6, respectively. However, a dramatic shift occurred under alkaline conditions, where ·OH contributions decreased substantially to·3.35 % and 0.89 % at pH 10 and 12, respectively. The kinetic model for the removal of BPA by Cu(II)/H 2 O 2 process was calculated as V= 0.236·[BPA] 0.173 ·[Cu(II)] 0.619 ·[H 2 O 2 ] 1.556 using one-eighth lifetime method. Furthermore, Cu(III) was found to be more reactive toward the benzene ring than ·OH. This work contributes to our understanding of the Cu(II)-mediated Fenton-like oxidation process, and it could offer a promising new method for treating refractory organic wastewater.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Jiahe Li,Xing-Yue He,Xiaowen Wang,Yiwei Lv,Jian-Gong Ma,Bo Li,Peng Cheng
CO2 hydrogenation is one of the key technologies for carbon recycling and greenhouse effect mitigation. Cu-based catalysts have been widely used in the hydrogenation of CO2 to methanol. However, the low catalytic efficiency and instability of Cu-based catalysts limit their industrial application. Herein, a Zr-based metal−organic framework was used to synthesize a Cu NWs@ZrO2 catalyst with a Cu-ZrO2 interface. The Cu NWs@ZrO2 catalyst shows high activity with promising selectivity and excellent stability for the synthesis of methanol from CO2 hydrogenation. Density functional theory calculations and in situ diffuse reflectance Fourier transform infrared spectroscopy confirmed that the CO2 hydrogenation on Cu NWs@ZrO2 followed the HCOO* pathway, and the Cu-ZrO2 interface made a significant contribution to the key intermediate step of CO2 to HCOO* and accelerated the CO2 hydrogenation.
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MACROMOLECULES
·
2021
·
IF 5.985
Sikai Chen,Ze-Lian Zhang,Fei Song,Xiu-Li Wang,Yu-Zhong Wang
Facing the limitation of weak compatibility on the use of cellulose nanofiber (CNF) as a reinforcement in polymer matrix nanocomposites, this work developed an alternative approach to fabricating a series of one-component CNF-reinforced nanocomposites by grafting polyacrylates from CNF via surface-initiated Cu(0)-mediated reversible deactivation radical polymerizations. An initiator group was initially introduced onto the surface of CNF through one-step esterification. Then, graft polymerization of methyl acrylate and n-butyl acrylate was carried out to obtain polyacrylate-grafted CNF. The graft polymerization exhibited several advantages, including simplicity, rapidity, and effectivity. A high graft ratio (up to 3000%) was obtained at room temperature after 3 h. The graft ratio was controlled by regulating the monomer concentration and reaction time. Characterizations confirmed that the chemical, morphological, and crystalline structure of CNF was maintained after surface modification and grafting. The uniform morphology and moderated transparency of solvent-casting polyacrylate-grafted CNF films proved the superior homogeneity of these nanocomposites. Tensile experiments revealed that poly(methyl acrylate)-grafted CNF nanocomposites had remarkable mechanical properties (tensile strength = 13.6–25.3 MPa; break elongation = 48.8–179.9%), contributing to an outstanding dispersity. By alternating the graft ratio, the mechanical behavior of the nanocomposite could transition from tough to ductile. This grafting approach has been proven to be a powerful tool for the design of CNF-reinforced nanocomposites for various purposes.
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Open Chemistry
·
2020
·Vol. 18
·期 1
·97-107
·
IF 1.216
Huayu Huang,Yang Wang,Yubin Zhang,Zhiying Niu,Xinli Li
Amino-functionalized graphene oxide (GO-NH 2 ) was synthesized by grafting (3-aminopropyl) triethoxysilane on the graphene oxide (GO) surface. The GO-NH 2 with high surface area and numerous active sites can efficiently adsorb Cr(VI), Cu(II), Pb(II) and Cd(II) ions. The maximum adsorption capacities of GO-NH 2 for Cr(VI), Cu(II), Pb(II) and Cd(II) were 280.11, 26.25, 71.89 and 10.04 mg g −1 , respectively. The pseudo-first-order and pseudo-second-order kinetic models were employed to describe the kinetic processes. The experimental data agreed well with the pseudo-second-order kinetic equation, and the adsorption of heavy metals onto GO-NH 2 occurs via chemical adsorption. The characteristics of Cr(VI), Cu(II), Pb(II) and Cd(II) in the GO-NH 2 adsorption processes were analyzed using the Langmuir and Freundlich isotherm models. The adsorption processes of Pb(II) and Cd(II) on GO-NH 2 were fit by the Langmuir model. The Freundlich isotherm model was well correlated to Cr(VI) and Cu(II). The GO-NH 2 is a promising material for the removal of heavy metal ions from industrial wastewater. This study provides an effective pathway to process industrial wastewater, and the GO-NH 2 has a good adsorption effect for the treatment of heavy metals in industrial wastewater.
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Nano Research
·
2014
·Vol. 7
·期 11
·1581-1591
·
IF 6.963
Guo Weisheng,Yang Weitao,Wang Yu,Sun Xiaolian,Liu Zhongyun,Zhang Bingbo,Chang Jin,Chen Xiaoyuan
Inorganic nanoparticles have been introduced into biological systems as useful probes for in vitro diagnosis and in vivo imaging, due to their relatively small size and exceptional physical and chemical properties. A new kind of colortunable Gd-Zn-Cu-In-S/ZnS (GZCIS/ZnS) quantum dots (QDs) with stable crystal structure has been successfully synthesized and utilized for magnetic resonance (MR) and fluorescence dual modality imaging. This strategy allows successful fabrication of GZCIS/ZnS QDs by incorporating Gd into ZCIS/ZnS QDs to achieve great MR enhancement without compromising the fluorescence properties of the initial ZCIS/ZnS QDs. The as-prepared GZCIS/ZnS QDs show high T
1 MR contrast as well as “color-tunable” photoluminescence (PL) in the range of 550–725 nm by adjusting the Zn/Cu feeding ratio with high PL quantum yield (QY). The GZCIS/ZnS QDs were transferred into water via a bovine serum albumin (BSA) coating strategy. The resulting Cd-free GZCIS/ZnS QDs reveal negligible cytotoxicity on both HeLa and A549 cells. Both fluorescence and MR imaging studies were successfully performed in vitro and in vivo . The results demonstrated that GZCIS/ZnS QDs could be a dual-modal contrast agent to simultaneously produce strong MR contrast enhancement as well as fluorescence emission for in vivo imaging.
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BIOSENSORS & BIOELECTRONICS
·
2022
·
IF 12.545
Kai Niu,Zicheng Zuo,Xianbo Lu,Lili Zou,Jiping Chen
There is an urgent need for developing electrochemical biosensor based on the acetylcholinesterase (AChE) inhibition to real-time analysis of organophosphorus pesticides (OPs), but it is suffered from the sluggish electrode kinetics and high oxidation potential toward signal species. Herein, a nanocomposite of ultrafine Cu quantum dots (QD) uniformly loaded on three-dimensional ultrathin graphdiyne (GDY) nanosheets (denoted as Cu@GDY) was synthesized via a one-step strategy, which showing high-density of active sites with persistent stability. Then an AChE biosensor based on Cu@GDY was fabricated to detect OPs, and the results revealed that the Cu@GDY nanocomposite can significantly amplifies electrochemical signal and reduces the oxidation potential for OPs. The strong interaction between active site of Cu@GDY and thiocholine signal species caused rapid analyte aggregation and decreased the reaction activation energy of thiocholine electro-oxidation. Benefiting from the excellent catalytic activity of Cu@GDY nanocomposite and reasonable regulation of enzyme inhibition kinetics , the biosensor achieved rapid and sensitive detection of OPs with a detection limit of 1 μg L −1 for paraoxon . Furthermore, the biosensor demonstrated great reproducibility, good stability and high recovery rate for OPs detection in real samples. Cu@GDY based sensor also displayed high catalytic activities and good selectivity to the non-enzymatic detection of glucose in alkaline medium . Cu@GDY offers a versatile and promising platform for sensors and biosensors featuring remarkably enhanced activity and stability, and can be applied to many other fields as desirable electrocatalyst .
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