CRYSTENGCOMM
·
2014
·Vol. 16
·期 38
·9054-9062
·
IF 3.858
Zongjian Liu,Yuanyuan Chen,Yifan Zheng
We propose a novel strategy for the synthesis of materials with a hierarchical structure. This strategy is based on in situ combination of two processes, namely, capping agent-mediated oriented growth and stirring-induced aggregation, and the growth of Cu crystals in the presence of linear alkyl diamines of short carbon chain length under vigorous stirring is shown to demonstrate its feasibility. Our experimental results have shown that the oriented growth of Cu nanowires can be significantly disturbed by vigorous stirring, resulting in large-scale growth of hierarchical dendritic Cu crystals. The morphology of grown dendritic Cu crystals has been found to vary with the stirring rate, type of diamine, and diamine concentration, which makes it possible to prepare hierarchical Cu structures of various morphologies. The growth mechanism of these hierarchical Cu structures is proposed based on the experimental observations. The present unique strategy offers a fresh way to fabricate materials with a hierarchical structure.
研究领域:
材料科学
·
化学
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DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 9
·2933
·
IF 4.927
Yiran Wang,Fengxue Duan,Xiaoting Liu,Bao Li
Counter-cations are essential components of polyoxometalates (POMs), which have a distinct influence on the solubility, stabilization, self-assembly, and functionality of POMs. To investigate the roles of cations in the packing of POMs, as a systematic investigation, herein, a series of triol-ligand covalently modified Cu-centered Anderson-Evans POMs with different counter ions were prepared in an aqueous solution and characterized by various techniques including single-crystal X-ray diffraction. Using the strategy of controlling Mo sources, in the presence of triol ligand, NH4+, Cu2+and Na+were introduced successfully into POMs. When (NH4)6Mo7O24was selected, the counter cations of the produced POMs were ammonium ions, which resulted in the existence of clusters in the discrete state. Additionally, with the modulation of the pH of the solutions, the modified sites of triol ligands on the cluster can be controlled to form δ- or χ-isomers. By applying MoO3in the same reaction, Cu2+ions served as linkers to connect triol-ligand modified polyanions into chains. When Na4Mo8O26was employed as the Mo source to react with triol ligands in the presence of CuCl2, two 2-D networks were obtained with {Na4(H2O)14} or {{Na2(H2O)4} sub-clusters as linkers, where the building blocks were δ/δ- and χ/χ-isomers, respectively. The present investigation reveals that the charges, sizes and coordination manners of the counter cations have an obvious influence on the assembled structure of polyanions.Keywords:polyoxometalate;Anderson-Evans;triol ligand;cation-modulation
研究领域:
无机化学
·
材料科学
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DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 21
·7378-7385
·
IF 5.721
Mengna Ding,Fengyan Shi,Huijuan Zhu,Yuping Yang,Jiahui Zhong,Liulin Luo,Yuning Huo,Hexing Li
A hybrid Cu2O/TiO2 composite loaded on a Cu mesh (Cu2O/TiO2@Cu mesh) was developed via a supercritical solvothermal route. A uniformly distributed Cu2O/TiO2 p–n hetero-junction was stably coated on a Cu mesh, benefiting the visible-light harvesting. In comparison to electrochemistry and visible-light photocatalysis, the photoelectrochemistry process on the photoanode of the Cu2O/TiO2@Cu mesh presented improved bacterial inactivation activity for Acinetobacter baumannii. By means of the main active species of ˙O2− radicals, the photoelectrocatalytic process on the Cu2O/TiO2@Cu mesh also realized complete leakage of K+ ions, much stronger mineralization of the cell membrane and more efficient elimination of the self-recovery function, finally leading to cell death. In comparison, the electrochemistry process only led to the leakage of K+ ions without inactivation of bacteria, and the visible-light photocatalysis process induced partial leakage of K+ ions and cell mineralization after the death of most bacteria.
研究领域:
环境科学
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材料科学
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微生物学
·
光电催化
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DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
·
IF 3.958
Chen Zhang,Tao Wang,Xiao Liu,Yunjie Ding
A series of copper-promoted platinum supported on activated carbon (Cu-Pt/AC) catalysts were investigated for glycerol oxidation to lactic acid. The catalytic performance of 1.0%Pt/AC catalyst was greatly influenced by Cu loading (0.1–2.0 wt%). Among them, the 0.5%Cu–1.0%Pt/AC catalyst showed the best promotional effect, whose lactic acid yield was 2.4 times of that on 1.0%Pt/AC under same reaction conditions. Characterizations were carried out to explore the relationships between catalyst properties and reaction performances. TEM images show that the introduction of Cu improves the dispersion of Pt and Cu, and some Pt-Cu interfaces are detected by HR-TEM, which would facilitate the glycerol transformation. XPS and H 2 -TPR analyses reveal that good catalyst performance is related with not only a proper surface Pt/Cu molar ratio, but also copper species’ oxidation states. Cu + and Cu 0 species favor glycerol conversion and lactic acid production, whereas large CuO particles facilitate the formation of glyceric acid.
研究领域:
催化化学
·
绿色化学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
·
IF 19.7
Wenkang Miao,Ronghui Hao,Wanyin Xu,Zihan Wang,Wenxin Lin,Heguang Liu,Wei Ren,Qianqian Li,Runhai Ouyang,Anmin Nie,Jinsong Wu,Hongtao Wang
Single-atom catalysts (SACs) have shown exceptional performance in heterogeneous catalysis, yet their practical application remains hindered largely due to their susceptibility to sintering and subsequent deactivation under harsh reaction conditions. To address the instability, we focused on Cu SACs/Al 2 O 3 and developed a novel dynamic thermostability system by introducing the functional CeO 2 oxide that serves as oxygen reservoir to suppress the sintering. High stability of the Cu SACs was directly observed through in situ aberration-corrected environmental scanning transmission electron microscopy under both thermal oxidation and reduction conditions. Combining first-principles calculations, we revealed that the ultra-stable Cu SACs was achieved by the sustained lattice oxygen supply from reversible ultrasmall CeO 2 (2.25 nm) decomposition to form mobile O x -Cu species, which establishes a dynamic equilibrium between the catalytically active O-Cu and sintering-resistant O 2 -Cu monomers. We found this stabilization strategy by introducing the CeO 2 oxide as oxygen reservoir can be effectively extended to a broad range of SACs (Ag, Co, Pt, Fe, Ni) on 3 different oxide supports (ZnO, TiO 2 , SiO 2 ). We anticipate this strategy and insights can be helpful in designing highly active and stable SACs toward industrialization.
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产品关联
DOI
高影响因子
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2026
·
IF 1.8
Meijun Yang,Yan Xiao,Zhimin Chang,Zhenhui Chen,Takashi Goto,Song Zhang,Rong Tu
Diamond/Cu composites are promising for thermal management but their poor wettability requires carbide coatings for interfacial modification. This work proposes a novel magnesiothermic reduction method for synthesizing TiC @diamond at low temperatures utilizing a MgCl2–KCl molten salt system with TiO2 as the Ti source. An ∼325 nm TiC coating forms on diamond at 750 °C for 2 hours without graphitization. Interfacial analysis shows a semi-coherent interface with specific crystallographic orientations ([110] TiC // [110] diamond, (1 − 1−1) TiC // (1 − 1−1) diamond). The TiC @diamond/Cu composite shows optimal performance: thermal conductivity (TC) of 689 W/(m · K), 63% International Annealed Copper Standard electrical conductivity and 98.55% relative density, representing increases of 280.66% in thermal conductivity, 90.91% in conductivity and 8.02% in relative density compared to uncoated composites. Its CTE (Coefficient of Thermal Expansion) at 300 °C drops from 17.98 × 10−6 to 6.92 × 10−6/K, a 61.5% relative reduction, significantly enhancing thermal dimensional stability.
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.7
Yarong Chai,Bo Gao,Song Xu,Qun Xu
Electrocatalytic conversion of nitrate to ammonia is a rapidly evolving field due to its potential applications toward nitrate pollution remediation and sustainable ammonia synthesis. As a group of well-established electrocatalysts, the activity of Cu-based materials is highly related to the coordination environment. Herein, a novel Cu–La-based dual-atom catalyst (Cu–La/DAC) was prepared using a Robson-type bimetallic Cu–La complex as precursor, where the square-planar Cu center of Cu–La/DAC effectively deviates due to the presence of adjacent La atom. As a result, the HOMO (dxy) energy of Cu is effectively reduced, which facilitates the formation of low-valent Cu and subsequent electrocatalysis. Compared to Cu2/DAC analogue containing square-planar Cu, Cu–La/DAC exhibits significantly enhanced activity toward electrocatalytic nitrate (NO3–) reduction to ammonia (NH3) (yield: 14.02 mg h–1 cm–2; Faraday efficiency: 88.42%), which is theoretically attributed to the reduced energy barrier of NO3– adsorption and *NO3 deoxygenation induced upon the coordination environment modulation of Cu.
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2020
·
IF 5.578
Bowen Lu,Zewu Zhang,Xiaoshan Li,Cong Luo,Yongqing Xu,Liqi Zhang
Cu catalysts have been widely used in CO 2 utilization due to their low reduction temperature and excellent CO 2 hydrogenation performance. It is important to well design Cu catalyst with high efficiency and durability for CO 2 hydrogenation. In this work, CuCe(rod) catalysts with various Cu contents were prepared. The physicochemical properties of the CuCe(rod) catalysts were described by XRD, TEM, N 2 -physisorption and H 2 -TPR.The effect of Cu content on catalytic performance of CO 2 hydrogenation with CuCe(rod) catalysts was also studied. Results showed that a high Cu content enhanced CO 2 conversion. The 40CuCe(rod) catalyst exhibited the best CO 2 conversion performance. At the reaction temperature of 400 °C, the CO production rate (CO 2 conversion) and CO selectivity based on the 40CuCe(rod) catalyst could reach 1.69 mol/g cat /h (41.1%) and nearly 100%, respectively. The analysis of kinetic measurements revealed that the activation energy of the 40CuCe(rod) catalyst was lower than that of other catalysts with different Cu contents during a reverse water–gas shift reaction. The lower activation energy and the interface structure of Cu-O x -Ce were closely related to CO 2 hydrogenation activity and remarkable stability for 96 h with minimal loss of CO 2 conversion activities.
研究领域:
化学工程
·
环境科学
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DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Chunhua Lin,Yue Du,Shiqi Wang,Li Wang,Yonghai Song
The work presents a novel glucose oxidase@Cu-hemin metal-organic frameworks (GOD@ Cu-hemin MOFs) with a ball-flower structure as bienzymatic catalysts for detection of glucose. The GOD@Cu-hemin MOFs exhibits great stability as compared with free horseradish peroxidase and GOD toward harsh conditions because the ball-flower-like shell of Cu-hemin MOF effectively protects from GOD. Thus, the GOD@Cu-Hemin MOFs can be used in external harsh conditions such as high temperature and acid/base. The GOD@Cu-hemin MOFs is capable of sensitive and selective detection of glucose via peroxidase-like of Cu-hemin MOFs and GOD by using 3,3′,5,5′-tetramethylbenzidine (TMB) as a substrate. Under the existence of glucose, O 2 is reduced into H 2 O 2 via GOD@Cu-hemin MOFs. The produced H 2 O 2 as well as Cu-hemin MOFs oxidize TMB into blue oxTMB which shows UV–Vis absorbance at 652. The absorption intensity of oxTMB linearly increases with the increasing concentration of glucose from 0.01 to 1.0 mM with detection limit of 2.8 μM. An integrated agarose hydrogel film (Aga/GOD@Cu-hemin MOF/TMB) sensor is rationally designed for colorimetric detection of glucose. The sensor displays a response range of 30 μM-0.8 mM with a detection limit of 0.01 mM. The result indicates that the Cu-hemin MOFs are an ideal carrier for the encapsulation of enzymes.
研究领域:
生物化学
·
材料科学
·
分析化学
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DOI
高影响因子
Nanoscale
·
2019
·Vol. 12
·期 3
·1811-1816
·
IF 6.97
Yongqin Liu,Liang Huang,Xinyang Zhu,Youxing Fang,Shaojun Dong
The electrochemical nitrogen reduction reaction (NRR) under ambient conditions is currently attracting intense attention, but it still remains a great challenge to develop highly selective and active NRR electrocatalysts. Inspired by the intrinsic NRR activity of Au, we systematically studied the synergistic enhanced effect of incorporating other transition metals into Au on its NRR activity. A general strategy was used to synthesize a series of Au-based bimetallic nanocatalysts (AuCu, AuAg, AuPd and AuRu), and the NRR catalytic performance of the as-obtained electrocatalysts was investigated in detail. The experimental results indicate that the positive effect of Cu on NRR was the most remarkable in comparison with that of Ag, Ru and Pd, which can be ascribed to the synergy of the Au and Cu components via modulating the electronic structure and further changing the binding affinity of adsorbed N atoms on the catalyst. Finally, the optimized nanocatalyst with the atom ratio of Au1Cu1 achieved the highest faradaic efficiency (54.96%) and ammonia yield rate (154.91 μg h−1 mgcat−1) at −0.2 V vs. RHE, exceeding those of the previously reported Au nanocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2020
·Vol. 64
·期 5
·1087-1094
·
IF 6.098
Wang Rui,Shi Faxing,He Xin,Shi Jinqiang,Ma Tao,Jin Song,Tao Zhanliang
The uneven deposition of lithium (Li) on current collectors causes serious dendrite growth and volume expansion. Commercial foamed copper (Cu) current collectors are unsuitable for Li anodes because of their large volume and mass and lithiophobic nature. Herein, a three-dimensional (3D) copper@tin (Cu@Sn) nanocone current collector with small volume, light weight, and lithiophilic nature was prepared by a simple electrodeposition method. The synergy of the nanoconical structure and lithiophilic Sn promotes the even deposition of Li and effectively inhibits the formation of Li dendrites. The resultant half batteries exhibit high Coulombic efficiency of 97.6% after 100 cycles at 1 mA cm −2 , and the symmetrical Li battery demonstrates a prolonged lifespan of over 600 h at 1 mA cm −2 . The full battery based on organic liquid electrolyte with LiFePO 4 also exhibits a long lifespan of 550 cycles with high capacity retention of 95.1% at 1 C. Moreover, 3D Cu@Sn nanocone-based solid-state batteries exhibit excellent electrochemical performance and show no decay after 500 cycles at 1 C. Our work provides a strategy for fabricating 3D current collectors for high-energy-density Li metal batteries.
研究领域:
材料科学
·
电化学
·
储能
·
纳米技术
·
锂离子电池
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2019
·Vol. 5
·期 3
·489-495
·
IF 0
Ruonan Wu,Zhili Li,Yongbo Li,Li You,Pengfei Luo,Jiong Yang,Jun Luo
Superionic conductors, which exhibit liquid-like phonon transport but crystal-like carrier transport, have attracted great attention and broad research interest in the thermoelectric community. Ag 2 Te is a superionic conductor; however, its small band gap and large Ag vacancy formation energy impede its application as a prominent p-type thermoelectric material. In this work, synergistic optimization of the thermoelectric performance of Ag 2 Te through Cu substitution is realized through a combination of experimental and theoretical efforts. For the electrical transport, Cu substitution systematically increases the band gap of Ag 2 Te and reduces the cation vacancy formation energy. These two beneficial effects simultaneously increase the electrical conductivity and suppress the bipolar effect, thereby greatly enhancing the p-type electrical transport properties of Ag 2 Te. For the thermal transport, alloying Cu 2 Te with Ag 2 Te significantly reduces the thermal conductivity through not only point defect scattering but also softening of the interatomic interactions. The latter is attributed to the relatively small Cu atoms vibrating in the oversized 8c sites. This two-fold optimization results in maximum thermoelectric figure of merit zT values of over 1.3 at 773 K for both Ag 1.2 Cu 0.8 Te and AgCuTe, demonstrating the great potential of Ag 2− x Cu x Te as a promising p-type thermoelectric material system.
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DOI
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