APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zhipeng Cheng,Xiaozhong Chu,Wei Zhao,Jingzhou Yin,Benlin Dai,Hui Zhong,Jiming Xu,Yu Jiang
Al powder faces high expectations for its use as fuel due to its high energy density. However, it is covered with a dense Al 2 O 3 layer, which has a high melting point. Thus, the powder has poor heat release and combustion performance. In this work, Cu/Al energetic nanocomposites are fabricated using a simple replacement reaction between Al and CuF 2 solution. CuF 2 ionizes F − to remove the Al 2 O 3 layer on the Al powder surface and ionizes Cu 2+ to provide a Cu source for deposition. The as-obtained Cu/Al nanocomposites have a typical strawberry-like core/shell structure. Cu/Al nanocomposites with different Cu contents can be obtained by simply adjusting the molar ratio of CuF 2 to Al. The design of these Cu/Al nanocomposites can improve the intensity, speed, and completion of the heat release of Al powder. The quantity of Cu strongly influences the heat release magnitude. The maximum heat release of the Cu/Al energetic nanocomposites with 5% Cu content reaches 24.7 kJ g −1 , which is approximately 1.8 times that of raw Al. The heat release mechanism of the proposed Cu/Al nanocomposite is based on the oxidation reaction phenomenon. The as-obtained Cu/Al nanocomposites are expected to have wide application prospects in solid energetic materials.
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高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Zhenhua Ge,Bin Fu,Xing Li,Jinping Zhao,Bo Ma,Zhiqiang Luo,Yantao Chen
Electrochemical water splitting is a very prospective technique to obtain the green hydrogen fuel . The oxygen evolution reaction becomes a limitation owing to the multiple electron transfer process. Thereby, a lot of attention is paid on the development of noble-metal free electrocatalysts for boosting the water oxidation process . The heterostructure of Mn 3 O 4 nanoparticles on Cu(OH) 2 nanowire arrays is fabricated, which exhibits an electrocatalytic activity close to RuO 2 . Compared with the single (hydro)oxides, the largely improved performance of the heterostructure towards water oxidation can be attributed to the enhanced charge transfer by the electronic interaction across the interface and the increased active sites for the rational combination of different active species . This work can be valuable for highlighting the role of heterostructure in the design and development of novel transition metal-based electrocatalysts for water oxidation.
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高影响因子
BIOTECHNOLOGY LETTERS
·
2020
·Vol. 42
·期 3
·445-451
·
IF 1.977
Zhang Lei,Xu Danyu,Kong Deyong,Ji Min,Shan Lianbin,Zhao Yongjiao
Objectives To investigate the effect of zero-valent iron and copper (Fe/Cu) micro-electrolysis on dark fermentative hydrogen production from glucose by a mixed bacterial consortium and the possible mechanisms of increasing hydrogen yield. Results Compared to zero-valent iron and activated carbon (Fe/C) micro-electrolysis, Fe/Cu micro-electrolysis could increase hydrogen yield by 32.2%, hydrogen production potential by 27.1%, and the maximum hydrogen production rate by 62.0%. Meanwhile, the number of ferrous ions released into the liquid phase with Fe/Cu micro-electrolysis was about 27.0% greater than that released by Fe/C micro-electrolysis, because the dispersion of copper on the surface of iron could markedly improve electrochemical corrosion activity. Metabolic analysis revealed that Fe/C micro-electrolysis promoted acetate formation, which may have been responsible for the observed improvement in fermentative hydrogen production. Further investigation indicated that Fe/Cu micro-electrolysis increased the activity of hydrogenases and stimulated the expression of the [FeFe]-hydrogenase gene. Conclusion Fe/Cu micro-electrolysis is better than Fe/C micro-electrolysis or Fe corrosion alone for dark fermentative hydrogen production.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Changtu Ma,Bing Dai,Yanxia Wu,Ying Liu,Lin Jing,Caili Zhang,Huayun Du
In-situ grown graphene nanosheets reinforced nickel-based composites (graphene/Ni composites) always suffer from the trade-off between strength and ductility due to the poor mechanical compatibility and interfacial bonding of reinforcement/matrix components. Microalloying has been established to be an effective strategy in strengthening the graphene/Ni composites; however, the influences of alloying elements on the microstructures and mechanical properties of the composite still remain unclear. This study introduces the Cu element into the Ni matrix for achieving a co-reinforcing effect with the well-dispersed in-situ graphene nanosheets. The experimental investigations and first-principles calculation reveal that a proper concentration of Cu dopant not only improves the bonding strength of the graphene/Ni interface by a good wettability, but also causes an abnormal grain growth in the Ni matrix and thus generates a bimodal structure. Consequently, the in-situ synthesized graphene/Ni composite with 1.5 wt.% Cu exhibits the optimal strength-ductility synergy with a high yield strength, ultimate tensile strength, and fracture elongation of 276 MPa, 575 MPa, and 49.9%, respectively. Compared to the undoped composite, the enhancements in these mechanical parameters reach 32.1%, 21.6%, and 28.9%, respectively. Despite the common strengthening mechanisms, such as the effective load transfer, dislocation strengthening, twin boundary strengthening, solid-solution strengthening, and Orwan strengthening, are contribute to the tensile strength of Cu microalloying graphene/Ni composites, it is determined that the hetero-deformation-induced hardening is playing a critical role. At the same time, the bimodal structure also delays the necking and further suppresses the crack propagation in the Ni matrix, enabling exceptional plasticity.
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 2
·1218-1232
·
IF 11.9
Zi-Yang Zhang,Hao Tian,Han Jiao,Xin Wang,Lei Bian,Yuan Liu,Nithima Khaorapapong,Yusuke Yamauchi,Zhong-Li Wang
The electrochemical CO2 reduction reaction (CO2RR) for high value-added multi-carbon product (C2+) production over copper oxide-based catalysts is an important way to realize the carbon cycle. However, developing effective reaction interfaces and microenvironments to improve the Faraday efficiency (FE) and current density of C2+ remains a major challenge. Herein, we construct Cu0–Cu+–NH2 composite interfaces with the assistance of SiO2. Using Cu2O nanoparticles as a model catalyst, a layer of porous SiO2 is first coated on the surface of the particles, and then, a silane coupling agent containing –NH2 is bonded on the surface of SiO2. The strong interaction between SiO2 and Cu2O at the interface induces the oxidation effect of low valent Cu, and even under the CO2RR, part of Cu+ is reduced to Cu0 and part of Cu+ still maintains positive valence, forming the interface of Cu0–Cu+. SiO2 also acts as a bridge between copper species and –NH2 to create a Cu catalyst–NH2 group interface. With the help of the synergistic effect of the composite interfaces, the optimized Cu2O@SiO2–NH2 catalyst achieves a FE of 81.2% for C2+ products with a current density of 292 mA cm−2 at −1.7 V versus a reversible hydrogen electrode. In situ Raman and attenuate total reflectance-infrared absorption spectroscopy spectra show that the interaction between surface –NH2 and CO2 molecules enhances the adsorption and activation process of CO2 and promotes the formation of CO intermediates (*CO). On the Cu0–Cu+ interface, the C–C coupling process between *CO is accelerated, and the two interfaces synergistically promote the generation of C2+ products. This work provides a new strategy for constructing composite interfaces to improve the CO2RR to C2+ products.
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高影响因子
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2019
·Vol. 30
·期 5
·988-996
·
IF 1.335
Wang Cheng-ya,Shang Shanzhai,Zheng Xudong,Lei Ping,Han Jingmei,Yuan Linda,Li Zhiqiang,Wang Ru,Gong Weimin,Tang Jianguo,Yang Yaling
In this paper, Cu-doped carbon quantum dots (Cu-CQDs) were prepared by carrying out thermolysis of Na2[Cu(EDTA)] and hydroxylamine hydrochloride at 300 ºC for 2 h. The as-prepared Cu-CQDs were characterized by UV-Vis, Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The Cu-CQDs exhibited good fluorescence property, high stability, excitation-dependent emission behavior and a quantum yield of 9.8%. More significantly, the synthesized Cu-CQDs were developed for sensing rutin (RT) based on the fluorescence quenching of the prepared Cu-CQDs. A good linear relationship between the fluorescence quenching of Cu-CQDs and different concentrations of RT was obtained in the range of 0.1-15 µg mL-1 with a correlation coefficient of 0.9959. The detection limit was as low as 0.05 µg mL-1 (signal-to-noise ratio, S/N = 3). The possible mechanism of fluorescence quenching was explored, which was proved to be inner filter effect. Importantly, the proposed method was successfully applied in the detection of RT tablet samples and with satisfactory results, showing the practical applications.
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IONICS
·
2020
·Vol. 27
·期 2
·657-666
·
IF 2.394
Hu Guorong,Liu Yanhua,Li Wei,Peng Zhongdong,Wu Jiahui,Xue Zhichen,Shi You,Fan Ju,Sun Qian,Cao Yanbing,Du Ke
P2-type Na 0.67 Ni 0.25 Mn 0.75 O 2 is considered as one of the most promising cathode materials for sodium-ion batteries due to its high initial capacity and operating voltage based on the Ni 2+ /Ni 4+ redox reaction. However, it suffers from rapid capacity decay caused by P2–O2 phase transition when the cutoff voltage is above 4.2 V (vs. Na + /Na). Herein, a high-voltage phase transition from P2 to an amorphous phase with poor crystallinity has been proved to be the main cause of material deterioration and Mn redox process is another cause. Cu-substituted Na 0.67 (Ni 0.25 Mn 0.75 ) 1−x Cu x O 2 ( x = 0, 0.05, 0.1, 0.2) with active redox couples of Ni 2+ /Ni 4+ and Cu 2+ /Cu 3+ has been fabricated for solving these issues. It is proved that Cu substitution can reduce the Mn 3+ /Mn 4+ reaction below 3 V (vs. Na + /Na) and suppress the high-voltage phase transition effectively at deep de-sodiated state, resulting in the significantly enhanced cycle life and rate capability of Na 0.67 Ni 0.25 Mn 0.75 O 2 .
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Polymers
·
2020
·Vol. 12
·期 3
·577
·
IF 3.426
Qiaoling Wang,Kaimin Chen,Yi Qu,Kai Li,Ying Zhang,Enyu Fu
Currently, it is an ongoing challenge to develop fluorescent nanosphere detectors that are uniform, non-toxic, stable and bearing a large number of functional groups on the surface for further applications in a variety of fields. Here, we have synthesized hairy nanospheres (HNs) with different particle sizes and a content range of carboxyl groups from 4 mmol/g to 9 mmol/g. Based on this, hairy fluorescent nanospheres (HFNs) were prepared by the traditional coupling method (TCM) or adsorption-induced coupling method (ACM). By comparison, it was found that high brightness HFNs are fabricated based on HNs with poly (acrylic acid) brushes on the surface via ACM. The fluorescence intensity of hairy fluorescent nanospheres could be controlled by tuning the content of 5-aminofluorescein (5-AF) or the carboxyl groups of HNs easily. The carboxyl content of the HFNs could be as high as 8 mmol/g for further applications. The obtained HFNs are used for the detection of heavy metal ions in environmental pollution. Among various other metal ions, the response to Cu (II) is more obvious. We demonstrated that HFNs can serve as a selective probe and for the separation and determination of Cu(II) ions with a linear range of 0–0.5 μM and a low detection limit of 64 nM.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Wei Li,Zeng Chen,Chaochao Wei,Wenping Kong,Binghua Xu,Xiyang Jia,Chunli Diao,Shengjun Li
An electrochemical method was developed for the formation of Al-Cu alloys. The electrodeposition of aluminum on Mo and Cu substrates was studied using cyclic voltammetry in molten LiCl-KCl-AlCl 3 (2 wt.%). During the cathodic scan of the cyclic voltammograms, three different Al-Cu alloys were observed before pure Al formed on the Cu substrate. The electrochemical formation processes were studied using square wave voltammetry and open circuit chronopotentiometry. The products of the different reduction processes were identified using XRD. The XRD results indicated that three different Al-Cu intermetallic compounds, Al 4 Cu 9 , AlCu, and Al 2 Cu, were obtained using electrochemical deposition in the molten salt system.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Xian-En Zhao,Ya-Nan Zuo,Yinghui Xia,Jing Sun,Shuyun Zhu,Guobao Xu
Although fluorescent nanozymes exhibit great potential in sensing fields, few current nanozyme-based sensors are designed to discriminate catechol (CC) from its two isomers. Herein, fluorescent metal-organic framework (MOF)-based nanozyme is utilized for ratiometric and selective detection of CC without the interferences of hydroquinone (HQ) and resorcinol (RC). NH 2 -Cu-MOF plays multiple roles: (1) it exhibits excellent photoluminescence at 435 nm owing to the 2-amino-1,4-benzenedicarboxylic acid ligand; (2) Cu 2+ imparts MOF oxidase activity to trigger the oxidation of o -phenylenediamine (OPD) into luminescent products (oxOPD) with emissive peak at 571 nm, which quenches the intrinsic fluorescence of NH 2 -Cu-MOF (435 nm) through inner filter effect (IFE); (3) Cu 2+ can complex with CC specifically to produce complex containing o -semiquinone, which not only inhibits MOF’s oxidase-like activity but also quenches the fluorescence of MOF. Therefore, the presence of CC induces the decrease of fluorescence at 571 nm followed by the slight recovery of fluorescence at 435 nm. Notably, HQ and RC have negligible influences on the fluorescence of NH 2 -Cu-MOFs/OPD system. Based on these facts, a ratiometric fluorescence platform for CC has been constructed. It exhibits high sensitivity towards CC with LOD of 0.1 μM.
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高影响因子
Frontiers of Environmental Science & Engineering
·
2021
·Vol. 15
·期 6
·1-12
·
IF 4.357
Meng Fanling,Xia Yunxue,Zhang Jianshuai,Qiu Dong,Chu Yaozhu,Tang Yuanyuan
Chromium slag usually contains various heavy metals, making its safe treatment difficult. Glass-ceramic sintering has been applied to resolve this issue and emerged as an effective method for metal immobilization by incorporating heavy metals into stable crystal structures. Currently, there is limited knowledge about the reaction pathways adopted by multiple heavy metals and the co-stabilization functions of the crystal structure. To study the Cu/Cr co-stabilization mechanisms during thermal treatment, a simulated system was prepared using a mixture with a molar ratio of Al 2 O 3 :Fe 2 O 3 :Cr 2 O 3 : CuO = 1:1:1:3. The samples were sintered at temperatures 600–1300°C followed by intensive analysis of phase constitutions and microstructure development. A spinel phase (CuFe x Al y Cr 2− x − y O 4 ) started to generate at 700°C and the incorporation of Cu/Cr into the spinel largely complete at 900°C, although the spinel peak intensity continued increasing slightly at temperatures above 900°C. Fe 2 O 3 /Cr 2 O 3 was more easily incorporated into the spinel at lower temperatures, while more Al 2 O 3 was gradually incorporated into the spinel at higher temperatures. Additionally, sintered sample microstructures became more condensed and smoother with increased sintering temperature. Cu / Cr leachability substantially decreased after Cu/Cr incorporation into the spinel phase at elevated temperatures. At 600°C, the leached ratios for Cu and Cr were 6.28% and 0.65%, respectively. When sintering temperature was increased to 1300°C, the leached ratios for all metal components in the system were below 0.2%. This study proposes a sustainable method for managing Cu/Cr co-exist slag at reasonable temperatures.
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高影响因子
Advanced Science
·
2025
·
IF 14.1
Chaomin Duan,Meng Wang,Yan Zhang,Zhihua Lian,Wenpo Shan
Ammonia (NH 3 ) emissions adversely affect both the environment and human health. The selective catalytic oxidation of NH 3 (NH 3 -SCO) holds great promise for NH 3 abatement; however, there remains a lack of cost-effective NH 3 -SCO catalysts with high activity and N 2 selectivity for practical applications. This study reports on a strategy for constructing an outstanding NH 3 oxidation catalyst via the in situ doping of Cu into CeO 2 nanorods. The designed CeCuO x nanorod catalyst shows remarkable activity, N 2 selectivity, and stability for NH 3 oxidation, achieving complete conversion below 250 °C, with ≈80% N 2 selectivity. The results of various characterization tests and density functional theory (DFT) calculations show that the addition of Cu induces the formation of abundant Cu + -O v -Ce 3+ active sites on the CeO 2 , which are beneficial for the adsorption and activation of reactants. Additionally, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) confirms that the addition of Cu switches the primary intermediate species of NH 3 oxidation from bidentate nitrate species to monodentate nitrate species, which accelerates the rate-determining step of NH 3 -to-N 2 oxidation. Therefore, doping Cu into CeO 2 greatly improves its NH 3 oxidation activity and N 2 selectivity. This study provides valuable insights into the construction of highly active sites for NH 3 oxidation.
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高影响因子
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