TETRAHEDRON
·
2013
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IF 2.803
Run-Lin Li,Gong-Qing Liu,Wei Li,Yu-Mei Wang,Lin Li,Lili Duan,Yue-Ming Li
3-Chloropiperidine compounds were obtained via Cu(II)-promoted one-pot intramolecular chloroamination of N -benzyl-4-penten-1-amines and subsequent rearrangement. The reaction conditions leading to this skeleton were studied, and the structure of the product was confirmed by NMR as well as X-ray diffraction experiments.
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RSC Advances
·
2014
·Vol. 4
·期 95
·52836-52844
·
IF 3.708
Li Zhao,Le Xin Song,Juan Xia,Yue Teng,Zheng Kun Yang,Qing Shan Wang
A simple, but efficient, method for the preparation of a series of Cu-based nanomaterials including Cu, CuCl, CuO, Cu@CuCl and CuCl@CuO was developed. Initially, we prepared a novel precursor consisting of a Cu(II)–urea complex (CUC, a coordination compound) and polytetrafluoroethylene (PTFE, a water-insoluble polymer) using the technique of solid–solid grinding. Subsequently, the Cu-based materials were synthesized by sintering the precursor at different atmospheres and temperatures. This approach provides an environmentally friendly and green alternative towards creating Cu-based materials by generating complex–polymer binary systems without the use of solvents. Our results indicated that the effect of PTFE played a crucial role in the formation of the materials. Further, the role of PTFE was found to be associated with sintering atmospheres: the reduction of CuCl to Cu in nitrogen was delayed; contrarily its oxidation to CuO in air was advanced. The nature of this role was ascribed to an ion–dipole interaction between the partial negative charges on the fluorine atoms (Fδ−) on the PTFE chains and the Cu(II) ions in the coordination centers [Cu(II)–urea] induced by a solid–solid mixing process, leading to the CUC complex decomposing later in nitrogen and earlier in air. Also, the presence of CUC drastically affects the thermal pyrolysis pattern of PTFE, resulting in a remarkable decrease, and even disappearance of the etching signals of PTFE. Finally, our data suggested that the as-prepared Cu@CuCl nanomaterial induced a strong surface-enhanced Raman scattering effect for several model compounds, including rhodamine 6G and crystal violet. We believe that this study represents a significant step towards the development of practical synthesis of Cu-based nanomaterials and opens up exciting opportunities for the design and construction of a wide range of transition metal-based nanomaterials through the link between polymers and coordination compounds.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2013
·
IF 2.145
Rui-tang Guo,Wen-long Zhen,Wei-guo Pan,Yue Zhou,Jie-nan Hong,Hong-jian Xu,Qiang Jin,Cheng-gang Ding,Shi-yi Guo
CeO 2 –CuO catalyst prepared by citric acid method was investigated for selective catalytic reduction of NO with NH 3 . The activity of the CeO 2 catalyst was enhanced about 8–27% in the temperature range of 125–225 °C at a space velocity of 28,000 h −1 by the addition of Cu. It was found that the state of Cu species had great impact on the SCR performance of CeO 2 –CuO catalyst. Cu 2+ can enhance the low temperature activity of SCR reaction, while CuO would promote NH 3 oxidation before SCR reaction at high temperature, which would cause the decrease of its high temperature SCR activity.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2015
·
IF 2.999
Huali Hao,Wei Mo,Yonghu Lv,Shulong Ye,Ruinan Gu,Peng Yu
The influence of trace elements on the powder metallurgy of Cu was investigated. It was found that 1 wt. % of Ti can effectively increase the green density of the compacts and facilitate the subsequent sintering process, thus resulting in increased sintered density. Although 1 wt. % of W added into the Cu leads to similar increasing of green density, W significantly retarded the sintering process and has a negative effect on the sintered density. Moreover, intermetallic Cu 4 Ti were formed, which not only creates a short-circuit diffusion path for Cu but also forms liquid phases during sintering. However, it was hardly dissolved between W and Cu.
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BIOSENSORS & BIOELECTRONICS
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2015
·
IF 6.409
Lihua Jin,Zaihua Zhang,Anwen Tang,Cong Li,Yehua Shen
In this work, we have presented a novel strategy to utilize as-synthesized yeast extract-stabilized Cu nanoclusters (Cu NCs) for sensitive and selective detection of S 2− . The fluorescence intensity of Cu NCs was enhanced significantly in the presence of both Na 2 S 2 O 8 and S 2− . By virtue of this specific response, a Cu NC-based fluorescent turn-on sensor was developed, which allows the detection of S 2− in the range of 0.02–0.8 μM with a detection limit of 10 nM. The enhancing mechanism was also discussed based on fluorescence decay , transmission electron microscopy (TEM) and dynamic light scattering (DLS) studies, indicating that S 2− enhanced the Cu NCs emission mainly through sulfide-induced aggregation of Cu NCs. Furthermore, we demonstrated the usability of the present approach for the detection of S 2− in water samples, which illustrates its great potential for the environmental monitoring and water quality inspection fields.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Xiaoyuan Zhang,Ping Gu,Xiaoyuan Li,Guanghui Zhang
Nano Cu 2 O/Cu modified activated carbon composite (nano Cu 2 O/Cu-C) was firstly synthesized by a simple and efficient hydrothermal method and used to adsorb iodide ion (I − ) from simulated radioactive wastewater . Nano Cu 2 O/Cu loaded and uniformly distributed on activated carbon with a diameter of 80–100 nm. The composite exhibited excellent adsorption performance, which was primarily attributable to the synergistic effect of nano Cu 2 O/Cu and activated carbon. Langmuir isotherm and pseudo-second-order kinetic model accurately represented the experimental data of I − adsorption. On the basis of the Langmuir isotherm, the maximum adsorption capacity of I − by nano Cu 2 O/Cu-C was 41.2 mg/g, which is significantly higher than pure nano Cu 2 O and activated carbon. The adsorption was affected only slightly by pH and other interfering ions. Additionally, X-ray photoelectron spectroscopy was used to elucidate the possible adsorption mechanism. This study provides new insight into the fabrication and practical application of high-performance adsorbent in removing radioactive I − from wastewater.
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Nano Energy
·
2017
·
IF 12.343
Wenjun Fan,Zelong Li,Chenghang You,Xu Zong,Xinlong Tian,Shu Miao,Ting Shu,Can Li,Shijun Liao
In this work, CuCl 2 as a promoter was added into the mixture of polythiophene (PTh), FeCl 3 , and melamine for preparing Fe-Cu-N/C catalyst. The catalyst features one-dimensional bamboo-like carbon nanotubes with few metal oxide nanoparticles encapsulated into tubes. The catalyst exhibits excellent activity toward the oxygen reduction reaction (ORR) with half-wave potential 50 mV more positive than the commercial Pt/C in 0.1 M KOH. It also shows comparable ORR activity in 0.1 M HClO 4 solution. Moreover, it exhibits superior long-term stability and excellent methanol tolerance in both alkaline and acidic solutions. The outstanding catalytic performance of Fe-Cu-N/C catalyst can be ascribed to the doping of Cu in the Fe-N-C architecture, which promotes the formation of bamboo-like nanotube structure and the generation of interaction among Cu and Fe-N-C. This synthetic strategy may open new avenues for constructing highly efficient electrocatalysts that adding of an inactive metal can obviously promote the catalytic performance of catalysts.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jing Zhou,Li Gao,ShengWen Yang,Zhenming Qu,Yu Cao,Jinbo Pang,Jian Ni,Jianjun Zhang
Germanous selenide (GeSe) is an emerging photoactive layer material due to its excellent photoelectric properties, low cost and environmental friendliness. However, severe carrier recombination in the GeSe photoactive layer remains a significant factor limiting the conversion efficiency of GeSe solar cells. In this study, the GeSe photoactive layers were doped copper chloride (CuCl 2 ) solution, enabling the distribution of Cu 2+ ions throughout the layer, primarily accumulating on the GeSe grain surface. Its impact on the carrier transport in the GeSe photoactive layer was studied by ultraviolet photoelectron spectroscopy, kelvin probe force microscopy, and transient photovoltage. The doping can not only increase the Fermi level of the GeSe, but also adjust the local built-in potential on grain boundaries, so that the charge carriers can be redistributed in the three-dimensional space. Notably, at the grain boundaries, the hole flow before doping changes to electron flow, effectively reduces the recombination probability of charge carriers, and increases the carrier lifetime from 200.23 to 374.57 μs. As a result, the conversion efficiency after processing with CuCl 2 is increased from 1.98 % to 3.01 %. This study provides a reference for understanding the carrier kinetics in GeSe solar cells to improve the photoelectric conversion performance of the device.
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Journal of Energy Chemistry
·
2024
·
IF 14
Yuan Zhuang,Kaixuan Wei,Zhenxing Li,Hanzhang Gong,Jianan Deng,Haozhong Yuan,Haoyu Lian,Hao Zheng,Honghao Zhao,Xiao Zhang,Jian Liu
Designing the coordination environment of heteroatoms around metal sites and optimizing the electronic structure of diatomic metal sites remain significant challenges in achieving efficient CO 2 overall splitting. Herein, we report four configurations (Cu/Ni–N 4 C 2 , Cu/Ni–N 2 C 4 , Cu/Ni–N 2 C 3 and Cu/Ni–N 2 C 2 ) constructed by precise regulation of the coordination environment around bimetallic atoms. Cu/Ni–N 2 C 2 showed high performance in electrochemical CO 2 reduction (ECR) and water oxidation evolution reaction (OER). In the electrochemical CO 2 overall splitting reaction, it achieved a Faraday efficiency of CO (FE CO ) of 98.0% at a low cell voltage of −2.9 V, significantly higher than widely reported values. Moreover, the FE CO is above 90% over −2.7 to −4.1 V of cell voltages. Cu/Ni–N 2 C 2 achieved long-term ECR stability of 110 h at −100 mA cm −2 . Mechanism studies revealed that the change of coordination environment around the diatomic pairs moves the d-band center of the Ni atom closer to the Fermi level, thereby modulating the adsorption capacity of the catalysts to the reaction intermediates *COOH and *O. This work presents valuable insights into the rational design of diatomic catalysts and elucidates the intricate structure-performance relationship in advancing electrochemical CO 2 overall splitting technology and energy-conversion applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Tao Tian,Jie Zhang,Sijie Ge,Lijiang Tian
Persulfate oxidation is a promising technology for air pollution control but still suffers from degrading refractory volatile organic compounds (VOCs) under mild conditions. Metal-doped metal-organic frameworks (MOFs) offer a novel strategy to enhance persulfate activation and VOCs degradation. Herein, a novel bimetallic MIL-101 (Fe, Cu) is prepared for more effective degradation of gaseous benzene via persulfate activation. Under optimal conditions (Fe/Cu ratio of 1:4, persulfate concentration of 7 mM/L, pH of 5, and reaction temperature of 70 °C), the MIL-101(Fe1, Cu4) activated persulfate system achieves a benzene degradation efficiency of 79.1 %, a value significantly higher than that of MIL-101(Fe) (20.1 %). The enhanced performance can be attributed to the synergistic effect of Fe²⁺/Fe³⁺ and Cu²⁺/Cu⁺ redox interactions facilitating the activation of persulfate and generation of radical species. Density functional theory (DFT) calculations indicate an increase in the adsorption energy of MIL-101(Fe) in the presence of Cu doping from −3.46 eV to −5.92 eV along with a rise in the Fermi energy level from 0.5 eV to 1.33 eV, enhancing the electron density and mobility. A reaction energy diagram is provided to illustrate the reaction pathways and transition states involved in the degradation of benzene. Overall, the incorporation of Cu in MOFs significantly enhances the efficiency of persulfate-based oxidation systems toward VOCs degradation.
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RSC Advances
·
2024
·Vol. 14
·期 36
·26604-26610
·
IF 3.9
Xiaodi Zhang,Xiyuan Tong,Junyang Wang,Xinyu Zhu,Zhuozhe Li,Fang Fang,Kun Qian,Yifeng E
We have prepared a highly active and stable copper-doped nickel electrocatalyst. Cu/Ni-doped MFI-type protozeolite layered nanoclusters electrodes have a large electrochemically active surface area (ECSA) and good HER activity, as well as excellent durability. The addition of Cu greatly increases hydrogen evolution reaction (HER) activity under acidic conditions. At the same time, the in situ grown Cu2+1O provides some activity, and in addition, the interface constructed between Cu and Ni further generates sufficient electrochemically active surface area. The activated Cu/Ni-doped MFI-type layered nanoclusters required only a 385 mV overpotential to generate 10 mA cm−2, demonstrating efficient and stable activity with potential practical applications.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yingying Xu,Mengyao Li,Yingjiu Zhang,Hongzhang Song,Haoshan Hao
A series of Bi 2 Sr 2 Co 2 O y (BSCO), Bi 2 (Sr 2/3 Ba 2/3 Ca 2/3 )Co 2 O y (BSBCCO), Bi 1.9 Cu 0.1 (Sr 2/3 Ba 2/3 Ca 2/3 )Co 2 O y (BCSBCCO) and Bi 1.8 Ag 0.2 (Sr 2/3 Ba 2/3 Ca 2/3 )Co 2 O y (BASBCCO) ceramic samples were prepared to optimize the thermoelectric properties of BSCO by high entropy doping combined with Cu/Ag doping. High entropy doping improves the carrier mobility significantly, due to a sintering effect in liquid phase and an additional conduction path. Cu/Ag acceptor doping increases the carrier concentration and Seebeck coefficients. Both them enhance the electrical transport performance of doped samples effectively. Specially, the random distribution of several different cations caused by high entropy doping and Cu/Ag doping can enhance the phonon scattering, which greatly reduces the thermal conductivity of doped samples. Finally, the thermoelectric figure of merit ( ZT ) value of the BASBCCO sample is improved to 0.36 at 923 K on the basis of high entropy doped BSBCCO ( ZT = 0.28 at 923 K), which is twice that of the pristine sample.
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