JOURNAL OF MATERIALS CHEMISTRY
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2012
·Vol. 22
·期 18
·9117-9122
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IF 5.968
Sha Chen,Hongye Zhang,Lingyan Wu,Yanfei Zhao,Changliang Huang,Maofa Ge,Zhimin Liu
Based on the galvanic replacement reaction between Cu nanoparticles and noble metal ions, a simple and efficient strategy was developed for the preparation of supported Cu–M (M = Pt, Pd, Ru, Rh) bimetallic nanoparticles under intense ultrasonication irradiation at ambient environment. A series of Cu–M/TiO2 bimetal catalysts with controllable composition, metal particle size less than 2 nm and narrow size distribution were obtained, and characterized by transmission electron microscopy (TEM), high resolution transmission electron microscope (HRTEM) with scanning TEM (STEM) mode, energy-dispersive X-ray spectrometers (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and ICP-AES analysis. It was demonstrated that most of the metal particles were present in the form of bimetallic state. The mechanism of this strategy was discussed. The resultant Cu–Pd/TiO2 was used to reduce nitrate at room temperature, and it exhibited extremely high activity.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-14
·
IF 14.7
Ye Runping,Ma Lixuan,Mao Jianing,Wang Xinyao,Hong Xiaoling,Gallo Alessandro,Ma Yanfu,Luo Wenhao,Wang Baojun,Zhang Riguang,Duyar Melis Seher,Jiang Zheng,Liu Jian
CO 2 hydrogenation to chemicals and fuels is a significant approach for achieving carbon neutrality. It is essential to rationally design the chemical structure and catalytic active sites towards the development of efficient catalysts. Here we show a Ce-CuZn catalyst with enriched Cu/Zn-O V -Ce active sites fabricated through the atomic-level substitution of Cu and Zn into Ce-MOF precursor. The Ce-CuZn catalyst exhibits a high methanol selectivity of 71.1% and a space-time yield of methanol up to 400.3 g·kg cat −1 ·h −1 with excellent stability for 170 h at 260 °C, comparable to that of the state-of-the-art CuZnAl catalysts. Controlled experiments and DFT calculations confirm that the incorporation of Cu and Zn into CeO 2 with abundant oxygen vacancies can facilitate H 2 dissociation energetically and thus improve CO 2 hydrogenation over the Ce-CuZn catalyst via formate intermediates. This work offers an atomic-level design strategy for constructing efficient multi-metal catalysts for methanol synthesis through precise control of active sites.
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PubMed
高影响因子
Materials Today Energy
·
2025
·
IF 8.6
Dandan Chen,Fengxia Yang,Mei Yang,Wenming Chai,Weidong Zhu,Chunfu Zhang,Yun Zhao,Yan Li
Perovskite and Cu(InGa)Se 2 (CIGS) tandem solar cells are emerging as an exciting prospect to achieve high-performance, cost effective, and lightweight all-thin-film photovoltaics, wherein perovskite solar cells (PSCs) fabricated using high-quality wide-bandgap perovskite films are critical to realize the high-efficiency PSC/CIGS tandem solar cells. Herein, a stepwise dimethyl sulfoxide (DMSO) solvent-annealing strategy is proposed to fabricate wide-bandgap (1.68 eV) Cs 0.15 FA 0.65 MA 0.2 PbI 2.4 Br 0.6 films via stepwise heating recipe, that is annealed at 100 °C firstly and then 80 °C. This modified solvent-annealing method makes for the Cs 0.15 FA 0.65 MA 0.2 PbI 2.4 B r0.6 films with full coverage, large grains, improved crystallinity, and free of impurities. Opaque PSCs with the desired Cs 0.15 FA 0.65 MA 0.2 PbI 2.4 B r0.6 films exhibit a champion power conversion efficiency (PCE) of 21.66 % and excellent stability. Furthermore, using an optimized IZO transparent electrode, the semitransparent PSCs with an impressive PCE of 21.26 % and a high bifaciality factor of 92.2 % are fabricated. These PSCs can further enable the four-terminal (4-T) PSC/CIGS tandem solar cells with a summed PCE of 29.36 %, surpassing of most the similar tandem solar cells reported earlier.
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MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Dingkun Yang,Yu Lei,Zhou Fan,Weigen Chen,Fu Wan
Surface-enhanced Raman scattering (SERS), functioning as a highly sensitive trace detection tool, has gained popularity as an analytical technique and is extensively employed in diverse domains such as electrical engineering. In this paper, the exploration is conducted regarding the application of surface-enhancement technology in the quantitative detection of the aging characteristics of transformer oil-paper insulation. Flower-like silver nanoparticles (AgNPs) were deposited in situ on a copper foil coated with porous graphene, thereby fabricating a Cu-graphene (porous)-AgNPs surface-enhanced substrate. This substrate effectively prevented the oxidation of nanoparticles while maintaining the SERS activity. By creating apertures in graphene, the adsorption capability of the substrate for organic small molecules like furfural was enhanced, and the size of silver nanoparticles was optimized to achieve better detection outcomes. The performance of the substrate was evaluated using R6G as the probe molecule, and the findings indicated that the substrate exhibited excellent sensitivity, uniformity (RSD values are below 10 %), and antioxidant properties (after 30 days, the peak strength decreased by 8.23 %). When this substrate was utilized for the detection of transformer aging characteristics, the detection limits for furfural, acetone, and methanol reached 0.04 mg/L, 0.18 mg/L, and 0.18 mg/L respectively, fulfilling the analytical requirements of oil-immersed transformers. This research holds significant importance in guaranteeing the stable operation of the power supply system and the smooth development of the national economy.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Ao Ding,Yupeng He,Fei-Fei Chen,Yan Yu
Bacterial infections result in significant burdens on public health, especially with the increasing prevalence of antibiotic resistance owing to the overuse of antibiotics. The development of the next-generation nanoantibacterial materials as alternatives to antibiotics is urgently needed. Metal–organic frameworks (MOFs) have been emerging as promising antibacterial materials. However, the impact of metal centers on the properties and antibacterial activity of MOFs has not been clarified to date. In this work, five M-MOF nanomaterials (M = Fe, Co, Ni, Cu, Zn) are synthesized with 2-methylimidazole as an organic ligand. Subsequently, the minimum inhibitory concentration (MIC), minimum bactericidal concentration, and time-kill curves are studied to evaluate their antibacterial activity. In addition, the destruction of the bacterial cells after treatment with M-MOFs is observed via scanning electron microscopy. The experimental results demonstrate that the Co-MOF and Zn-MOF polyhedra exhibit optimal antibacterial activity. They can effectively inhibit the growth of both Gram-negative bacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus at a low concentration. On the other hand, the Fe-MOF irregular particles show the weakest antibacterial activity among five M-MOFs and the antibacterial activity of the Ni-MOF and Cu-MOF nanosheets are comparable to each other. The huge difference in antibacterial activity of M-MOFs is attributed to the difference in the shape and size, specific surface area, surface charge, ion release, and production of reactive oxygen species. Overall, this study clarifies the relationship between metal centers in M-MOFs and their antibacterial activity.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 36
·e55918
·
IF 2.7
Juan Chai,Yaxin Hou,Yanhui Zhang,Yan Xia,Shiya Ran,Shengyan Wang,Nianfu Chen,Zhenghong Guo,Juan Li,Zhengping Fang
Inspired by the significant catalytic charring effect of metal–organic frameworks (MOFs), Cu-MOF decorated ammonium polyphosphate (APP@Cu-MOF) was prepared by coupling agents to improve the fire safety of epoxy resin (EP). After adding 9 wt% APP@Cu-MOF, the fire performance of EP is significantly improved with limiting oxide index (LOI) value of 29.4 and UL-94 V-0 rating. The peak heat release rate (PHRR), total smoke production (TSP), CO production, and CO 2 production of EP composite samples decreased by 34.6%, 54.7%, 24.6% and 30.0%, respectively. It is proposed that the synergistic effect among Cu-MOF and APP promoted the char formation of EP. The dense carbon layers formed a barrier that prevented the transfer of heat and inhibited the release of toxic gases, thus acting as a flame retardant. This work provides a new strategy to develop a high-efficient MOF-decorated flame retardant with smoke inhibition, toxicity reduction, and catalytic carbonization effect.
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RSC Advances
·
2017
·Vol. 7
·期 14
·8709-8717
·
IF 3.108
Yu Hao Wang,Wen Gui Gao,Hua Wang,Yan E. Zheng,Wei Na,Kong Zhai Li
A series of Cu–ZrO2 (CZ) catalysts with different surface area, copper surface area (SCu), oxygen vacancy concentration, and interaction between Cu and ZrO2 features were synthesized. The factors that could affect catalytic activity of CO2 hydrogenation to methanol were investigated. The interaction between Cu and ZrO2 is crucial for determining the catalytic activity. The catalyst possessing the strongest interaction between Cu and ZrO2, exhibited the optimum catalytic activity. The evolution of carbonaceous species and pyridine adsorption over CZ catalysts were investigated using in situ DRIFT spectroscopy. It is found that the hydrogenation of formate species is a rate-limiting step and H spillover plays an important role. The hydrogenation of formate species and H spillover are strongly dependent on the interaction. These results provide a new way of understanding the activity dependence and reaction mechanism of CO2 hydrogenation to methanol over CZ catalysts.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xueqian Wu,Jin Zhao,Jiangyan Tao,Jiawen Chi,Xin Min,Songjian Zhao
As a major greenhouse gas, the rational conversion and utilization of CO 2 can help reduce carbon emissions and mitigate the greenhouse effect. In this study, mesoporous SiO 2 as a carrier, with CuO and NiO employed to construct a binary metal composite silica-based catalyst, coupled with dielectric barrier discharge (DBD) plasma, for the conversion of CO 2 . Physicochemical analysis confirmed the successful introduction of CuO into the mesoporous SiO 2 . NiO and CuO bimetals were dispersed on SiO 2 surfaces with large specific surface areas, ensuring an optimal distribution of metal oxide. Gas chromatography was utilized to investigate the performance of DBD-coupled x%CuO-3 %NiO/Si for CO 2 conversion. The results indicated that the CuO-NiO binary composite silica catalysts significantly improved CO 2 conversion, CO yield, and energy efficiency compared to the monometallic 3 %NiO/Si materials. Further microstructural analysis of the 9 %CuO-3 %NiO/Si catalyst revealed near-elliptic particles with dimensions of 200 by 500 nm and a large number of irregular fine particles attached to the surface. When the CuO loading reached an optimal level and the input power was set at 30 W, the energy efficiency of the 9 %CuO-3 %NiO/Si catalyst increased by 119.6 %. The CuO-NiO binary composite Si-based catalyst developed in this study boasts simple operation and environmental friendliness, making it highly significant for CO 2 treatment.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
·
IF 4.2
Weiting Zhong,Jiaqi Lu,Jun Hou,Hui Li,Lixia Ma,Xu Zhang,Yanbao Zhao
In this study, water soluble Cu-doped CdS quantum dots (Cu:CdS QDs) were synthesized by one-pot method. The effect of reaction conditions on the Cu:CdS QDs were studied systematically, and the Cu:CdS QDs synthesized under optimizing condition possessed a small size (∼4 nm), high luminance and good self-fluorescence performance. Compared with CdS QDs, the fluorescence emission was redshifted from 627 nm to 720 nm. To reduce cytotoxicity of Cu:CdS QDs, carboxymethyl chitosan (CMCS) molecules were selected to be grafting onto the surface of Cu:CdS QDs through amide bonds and the CMCS modification would greatly impede the release of cadmium ions . Both in vitro cellular cytotoxicity and hemolysis assay demonstrated that the CMCS/Cu:CdS QDs were highly biocompatible and the CMCS/Cu:CdS QDs as fluorescent probes were successfully applied in vivo imaging of small animals and this QDs can be easily metabolized by mice over time without adverse reactions . This new nanoprobes open up exciting opportunities for future biomedical applications .
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Jing Yao,Huiying Wang,Ziwang Che,Bolin Feng,Hailong Cheng,Yingying Huang,Yunlong Zhou,Qiuping Qian,Zhenbin Chen
Despite the continuous exploration and development of new antibiotics, the emergence of super-resistant bacteria has led to a gradual loss of effectiveness in some antibiotics. Developing new methods and applying antimicrobial materials can effectively reduce antibiotic usage, thereby slowing down the emergence of bacterial resistance. Herein, we present a novel micro-nano composite antimicrobial material synthesized through a one-pot method. This innovative system integrates ZnO, Cu2O, and CuCO3 onto CaCO3 carriers, demonstrating dual advantages of structural simplicity and functional synergy. The composite exhibits exceptional antimicrobial performance with minimum bactericidal concentrations of 15.625 µg/mL against Gram-negative bacteria and 7.8125 µg/mL against Gram-positive bacteria, while maintaining favorable biosafety. Mechanistic studies reveal a dual bactericidal action: (1) physical disruption of bacterial membranes through permeability alteration and structural damage, leading to critical cellular component leakage (e.g., DNA); (2) intracellular reactive oxygen species (ROS) overproduction triggering oxidative stress. Characterization by thermogravimetric analysis confirms its thermal stability and suitability for polymer processing. The cost-effective synthesis protocol and scalable production potential position this copper-zinc micro-nano composite as a promising candidate for advanced antimicrobial plastics engineering, addressing both efficacy and industrial feasibility requirements.
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Molecular Catalysis
·
2024
·
IF 3.9
Zheng Zhou,Meng Miao,Wenzhi Li,Jingting Jin,Liqun Wang,Lulu Zhang,Liang Yuan
The selective conversion of methane is a significant but difficult challenge. We reported a CuFe bimetallic catalyst supported by g-C 3 N 4 for the catalytic oxidation of methane to oxygenated C1 products. Using H 2 O 2 as the oxidant, Cu 0.4 Fe 0.3 -C 3 N 4 catalyst had a C1 yield of 8231 μmol·g cat −1 · h −1 at 70 °C, and 1 H NMR results showed that almost all of the liquid phase products were target C1 products. The methanol selectivity on CuFe-C 3 N 4 was 44.5 %, comparing with 20.2 % methanol selectivity on Cu-C 3 N 4 . The formation of a Cu-O-Fe site on the CuFe-C 3 N 4 was confirmed by in situ DRIFTS and 57 Fe Mössbauer spectroscopy. This Cu-O-Fe site was responsible for the improved catalyst performance. DFT calculations illustrated that at the Cu-O-Fe site, H 2 O 2 dissociated into two ·OH radicals instead of ·H and ·OOH radicals as it did at the Cu-O-Cu site. The ·OH radicals combined with the ·CH 3 radicals from the CH 4 molecules to form methanol. These findings provided valuable insights into the rational design of active sites on carbon nitride materials.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Zheng Cui,Yueli Wen,Bin Wang,Maohong Fan,Faraz Ahmad,Hui Bai,Wei Huang
Activation of hydrogen atoms of methyl in toluene and methanol is crucial for side-chain alkylation of toluene with methanol. Herein, two strategies were applied, introducing dehydrogenation component (Cu) and tailoring the catalyst acid-base property with NaOH. A series of Cu and NaOH dual-modified PAl-NaX catalysts were prepared by in-situ hydrothermal method, the synergistic effect of Cu and NaOH was investigated. It is revealed that the product of (medium base)* (weak acid) and surface Cu δ+ percentage is crucial in controlling the total yield of side chain alkylation products by enhancing ethyl benzene selectivity. Cat-3Cu-13Na exhibits the optimal catalytic performance with an average methanol conversion of 97.25 % and an average total yield of side chain alkylation products of 77.46 % without obvious deactivation occurs in 192 h, and Cat-3Cu-19Na shows a promising styrene selectivity of 44.06 %. The decrease of weak acid sites might result in the decline in selectivity of styrene.
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