ADVANCED ENGINEERING MATERIALS
·
2024
·Vol. 26
·期 7
·2301901
·
IF 3.4
Meihui Xiao,Lan Zhang,Jiali Li,Lin Chen,Jun Sun,Kun Hu,Yi Gong,Jianjun Ding,Yongxing Lin,Xiangyang Li,Gang Liu,Xian Zhang,Xingyou Tian
Low-temperature cofired ceramic (LTCC) materials are a promising material for heat dissipation substrates due to their excellent thermal conductivity and thermal expansion coefficient similar to that of silicon. However, the difficulties in surface metallization techniques limit its application. This work uses Bi–B–Si–Zn–Al glass/ceramic composite as the substrate and Bi–B–Si–Zn–Al glass powder as the inorganic binder for silver pastes. The silver thick film with a glass content of 3 wt% is sintered at 800 °C for 30 min, and the samples have excellent electrical conductivity (surface square resistance of 0.29 mΩ £ −1 ) and mechanical properties (interface bonding force of 17.56 MPa). In addition, the introduction of CuO into the glass phase can inhibit the silver diffusion phenomenon during the sintering process and improve the conductive performance of the material. The results are beneficial for the preparation and application stability of LTCC devices.
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高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Jiayan Yang,Wenlei Yin,Bin Zhou,Anyang Cui,Liping Xu,Dongxu Zhang,Wenwu Li,Zhigao Hu,Junhao Chu
Despite much attention on the photoelectronic device applications of CuO-based materials, a thorough analysis of optical properties and electronic band structure of Ni-doped CuO films is still necessary. Here, the calculation based on the density functional theory revealed a strong hybridization of O 2p and Cu 3d orbits near the conduction band minimum (CBM) and valence band maximum (VBM) of CuO films. The Ni addition is found to enhance the carrier mobility, because the weaker localization of O 2p states at the VBM is observed in 50 atom % doped CuO. To confirm the theoretical results, the ellipsometric spectra of solution-processed CuO films doped by Ni ions (from 0 to 50 atom %) were fitted, and the optical constants were uniquely extracted. The optical conductivity has a linear increase with the Ni doping concentration, which results from the decreased electron traps. Besides, the band gap was found to be modulated in a range of 2.22–2.37 eV owing to the quantum confinement effects. The variation trend is confirmed by the first-principles calculation, where the computational indirect band gap is 1.27 and 1.79 eV for pure CuO and 50 atom % Ni-doped CuO. Four electronic transitions are observed at ∼2.75, 3.27, 4.01, and 4.90 eV, and the physical origins have been discussed.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Shengnan Li,Binghua Jing,Yuqi Sun,Juan Li,Didi Li,Xiaoguang Duan,Shaobin Wang,Zhimin Ao
A Cu-O-Bi bond-engineered CuO catalyst (FB-CuO) was constructed on copper foam via in-situ growth to break the symmetry of the CuO coordination environment and accelerate Cu redox cycling during peroxymonosulfate (PMS) activation. Its activation mechanism was systematically investigated through quenching experiments, electron paramagnetic resonance (EPR), metal-site poisoning tests, electrochemical analysis, spectral characterization, and density functional theory (DFT) calculations. FB-CuO achieves 93.32% atrazine (ATZ) degradation within 60 min, exhibits excellent reusability over six cycles, maintains over 65% removal efficiency in tap water and lake water, enables 12 h continuous rhodamine B removal in a flow-through reactor, and shows good selectivity toward other nitrogen-containing organic pollutants. Mechanistic results demonstrate that Cu-O-Bi sites optimize the microenvironment of Cu centers, enhance PMS adsorption, and accelerate the Cu(II)/ Cu(III) redox cycle for radical generation, while ATZ coordinates with surface Cu sites through Cu-N bond formation, promoting Cu(II) reduction to Cu(I) and further accelerating PMS activation and Cu redox cycling. These findings establish a mechanistic framework for coupling active-site engineering with catalyst-pollutant interaction to intensify PMS activation, and provide a general design principle for robust structured catalysts in persulfate-driven environmental catalysis.
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COMBUSTION SCIENCE AND TECHNOLOGY
·
2023
·
IF 1.9
Shanshan Li,Shuang Men,Li Wei
Carbon nanotubes (CNTs) loaded with copper oxide (CuO) as the combustion catalysts for solid propellants are able to increase the combustion rate and reduce the pressure index of propellants. The dispersibility of CNTs in water is one of the most important factors influencing the loading of CuO. In this paper, 1-dodecyl−3-methylimidazolium chloride ([C12C1Im]Cl) was prepared and used as the pretreatment agent of CNTs. The Nuclear magnetic resonance (NMR) results indicated the successful synthesis of [C12C1Im]Cl, which contains a positively charged imidazolium hydrophilic headgroup, enabling it as a cationic surfactant for the surface pretreatment of CNTs. The properties of the [C12C1Im]Cl-pretreated CNTs were compared with those pretreated with sodium dodecyl sulfate (SDS) and mixed acids (with a volume ratio of concentrated sulfuric acid to concentrated nitric acid = 3:1). X-ray diffraction (XRD) results showed that the crystalline structures of the CNTs were unchanged by using all of the three pretreatment methods. Scanning electron microscope (SEM) morphology analysis showed that the CNTs pretreated with [C12C1Im]Cl had the clearest tubular shape, the smoothest walls and the best dispersion in water without agglomeration. The impact of the pretreatment methods on the loading of CuO onto the surface of CNTs was also illustrated. It was concluded that by pretreatment with [C12C1Im]Cl, it led to the best CuO dispersion on the CNTs surface, the smallest CuO grain size and the largest CuO content. The study on the loading mechanism indicated that CuO could be successfully loaded on CNTs only when the pH > 4.6014, given the temperature is higher than 75°C.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Wei Wu,Jingyu Long,Yuanjun Guo,Xiaotao Zu,Sean Li,Xia Xiang
A surface acoustic wave (SAW) H 2 S gas sensor based on CuO-TiO 2 p-n heterojunction film was designed and fabricated. The sensor exhibits high sensitivity to H 2 S due to the significant current response of CuO-TiO 2 film to H 2 S gas and the appropriate work point of SAW sensor based on CuO-TiO 2 composite film. The linearity change for sensor frequency shift is strongly associated with the location of work point when the H 2 S concentration increases from 1 to 300 ppm. In addition, the porosity of CuO-TiO 2 film is beneficial to the efficient adsorption for H 2 S, leading to the higher frequency shift of the sensor. The SAW sensor also shows good selectivity and stability to H 2 S with stable frequency shift under different humidity levels.
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ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Huanxin Zhao,Yuqi Liu,Dan Wu,Huixin Yu,Xuejun Zhang,He Wang,Xiaoyuan Shang,Mingyi Lv
The development of single atom catalysts (SACs) with superior catalytic performance is a long-term goal for peroxymonosulfate (PMS) activation in advanced oxidation processes (AOPs). A novel SACs that single Co atoms anchored on CuO with enriched oxygen vacancies (O v ) is synthesized successfully by choosing a metal oxide as the carrier creatively. 100% of tetracycline (TC) can be removed by Co–CuO (O v )/PMS system within 3 min. The corresponding reaction rate constant is 3.1068 min −1 , which is much higher than that of CuO (O v ), ZIF-CoN 4 -C, Co–CuO (without O v ) and Co NP –CuO (O v ), respectively. Co(II) is the primary source of radical pathway (·OH and SO 4 · - ), and its regeneration is promoted by Cu(Ⅰ). The enriched O v is the major contribution to the nonradical pathway, which promotes the singlet oxygen ( 1 O 2 ) generation together with accelerates the electron transfer from TC to catalyst-PMS*. Besides, the Co–CuO (O v ) exhibits an excellent stability and anti-interference capability. This study highlights a novel strategy to promote PMS activation by incorporating the single metal atoms on a metal oxide carrier with defects to accelerate the redox of dominate metal and stabilize the metal atoms simultaneously, which may inform the design for the next generation of SACs in AOPs.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jingtong Yu,Dongmin Yue,De Sun,Bingbing Li,Yanxia Ge,Yuanhang Lin
Solar-driven photothermal conversion vacuum membrane distillation (SVMD) becomes an energy-efficient water treatment thanks to the thermal localization of photothermal membranes. Membrane photothermal activity and distillation performance are essential for creating photothermal composite membranes. Herein, a CuO/CF-PVDF photothermal composite membrane has been designed with flower-like copper oxide (CuO/CF) photothermal active-layer and polyvinylidene fluoride (PVDF) microporous hydrophobic separation layer. Firstly, the flower-like CuO/CF layer with the light trapping was obtained by in-situ surface oxidation on the copper foam (CF) surface. Then, by the NIPS method, PVDF microporous hydrophobic layer was scraped on one side of the CuO/CF photothermal active-layer and firmly fixed on the porous surface of CuO/CF layer by anchoring effect. The light trap consisted of CuO micron flowers and Cu(OH) 2 nanowires. The gaps among the petals increased the light refractive rate and absorption area, thus enhancing the photothermal performance of the CuO/CF. Under 1 kW‧m −2 solar irradiation, the absorption rate reached up to 95 %, and the photothermal conversion efficiency achieved 94 %. For the SVMD process, compared to current research, the CuO/CF-PVDF achieved the permeate flux of 3.34 kg‧m −2 ‧h −1 and energy efficiency of 88 % under average feed temperature. Overall, the CuO/CF-PVDF membrane has promising potential for desalination by fully using sustainable energy.
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ChemNanoMat
·
2022
·Vol. 8
·期 6
·e202200118
·
IF 3.82
Zhe Shi,Changsheng Tang,Yidong Xu,Yinghui Hu,Jian Zhang,Zhaoyang Zhu,Jian Zheng,Ruiqing Fan,Debin Xia,Yulin Yang
Graphical In this study, n-CuO-X/g-C 3 N 4 composites have been synthesized and were applied for catalyzing AP thermal decomposition. The generated n-CuO/g-C 3 N 4 composites were the excellent catalyst for AP-based composite solid propellants to improve their decomposition efficiency and energy output. The thermal decomposition mechanism of AP was investigated and n-CuO-X/g-C 3 N 4 composites could effectively change the thermal decomposition path of AP and significantly inhibited the conversion of N 2 O to NO during decomposition, thus increasing the apparent heat release of AP decomposition. Enhancing the exothermic decomposition of ammonium perchlorate (AP) is of great significance to obtain solid propellants with excellent combustion performance. Herein, we prepared a series of composites for catalyzing the exothermic decomposition of AP by a facile method with different masses of nano copper oxide (n-CuO) dispersed in graphene-nitride carbon (g-C 3 N 4 ) nanosheets. Among them, n-CuO-8/g-C 3 N 4 showed the best catalytic activity, which reduced the high-temperature decomposition (HTD) value by 95.0 °C, and increased the total heat release by 505 J ⋅ g −1 . The n-CuO-12/g-C 3 N 4 also reduced the activation energy ( E a ) of the HTD stage by 47.34 kJ ⋅ mol −1 . The catalytic mechanism study suggested that the n-CuO-X/g-C 3 N 4 composites promoted the transition of electrons (e − ) and holes (h + ) from ClO 4 − to NH 4 + and inhibited the recombination of e − and h + , which further enhanced the exothermic decomposition of AP. During decomposition, the transformation of N 2 O to NO was significantly inhibited by the n-CuO-X/g-C 3 N 4 composites, thus increasing the integral heat release as evidenced by Real-time thermogravimetry/Fourier transform infrared spectroscopy. This study illustrated that n-CuO-X/g-C 3 N 4 composites are catalysts for the efficient decomposition of AP, which further enhance the energy performance of solid propellants.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Yinlong Xiao,Wei Tang,Willie J.G.M. Peijnenburg,Xiaohong Zhang,Jun Wu,Min Xu,Hong Xiao,Yan He,Ling Luo,Gang Yang,Chao Chen,Lihua Tu
Nanoparticles (NPs), heavy metals and natural organic matter may co-exist in the water bodies. Currently, knowledge on their interaction effects on the behaviors and fates of NPs and heavy metal ions is rather limited, which is critical to comprehensively understand their environmental risk. In this study, the aggregation, solubility and Cd-adsorption of CuO NPs co-existing with humic acid (HA) and Cd 2+ upon different solution pH and contact sequences were determined. In the ternary systems of CuO NPs, HA and Cd 2+ , pH was more important than the contact sequence of the components in affecting the NP aggregation, while the contact sequence was a predominant factor in determining the NP solubility. Pre-equilibration of CuO NPs and HA before addition of Cd 2+ resulted in the highest solubility and lowest aggregation of the NPs, relative to other sequences of addition of the components. The adsorption capacity of CuO NPs for Cd-ions increased with an increasing pH value from 5 to 9. HA significantly enhanced the Cd-adsorption capacity of CuO NPs at pH 7 and 9, while at pH 5 a non-significant effect was observed. The results are helpful to better estimate the behaviors and fates of CuO NPs and Cd 2+ when they coexisting in natural waters.
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PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Xinyi Gui,Mingfen Zhang,Puhao Xu,Guiwu Liu,Qinhan Guo,Xiangzhao Zhang,Haining Meng,Guanjun Qiao
Reactive air brazing of Si 3 N 4 ceramic was successfully achieved by using Ag-CuO filler metal. The effects of CuO content on the wettability of Ag-CuO/Si 3 N 4 system and the shear strength of Si 3 N 4 /Si 3 N 4 joint were investigated, and meanwhile the interfacial behavior was analyzed and discussed. Moreover, the work of adhesion, interfacial energy, and electronic properties of Ag/Si 3 N 4 , Ag/CuO and Ag/SiO 2 interfaces were evaluated by first-principles calculations. The Ag-CuO/Si 3 N 4 system transforms from no-wetting into wetting due to the oxidation of Si 3 N 4 substrate and the formation of SiO 2 layer on the substrate surface. The maximum average joint shear strength of over 50 MPa is obtained as the CuO content is 8 at.%. Compared with the Ag(111)/Si 3 N 4 (0001) interface, the Ag(110)/CuO(001) and Ag(110)/SiO 2 (001) interfaces show stronger interfacial bonding due to the formation of Ag-O ionic bond, indicating that the addition of CuO and the formation of SiO 2 contribute to the enhancement of interfacial bonding.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jiajia Li,Yi Li,Manhua Chen,Xi Tang,Nianwen Zhu,Wenxuan Li,Qiong Mei,Shijun Yue,Yuping Tang,Qizhao Wang
The exploitation of magnetic recyclable and effective degradation photocatalysts with wide-pH-range response was essential to the practical application in the photo-Fenton process. In this study, Cd/CdS coupling with CuO/Fe 2 O 3 /CuFe 2 O 4 (CF) was employed to prepare an efficient and recyclable photocatalyst Cd/CdS-CuO/Fe 2 O 3 /CuFe 2 O 4 (CCCF). The obtained CCCF was utilized to activate H 2 O 2 for the photo-Fenton degradation of tetracycline after verifying optical properties and energy band structures. The photo-Fenton degradation performance of CCCF on tetracycline was researched in the effects of photocatalyst concentration, initial pH and H 2 O 2 volume. The photo-Fenton removal efficiency of CCCF+H 2 O 2 was capable of achieving 82.43 % under the optimal reaction condition, which was apparently higher than that of Cd/CdS and CF. The enhanced degradation efficiency could be owned to the effective carriers separation thanks to the p-n heterojunction . The development of such photocatalysts offers a new approach to degrading organic pollutants from industrial wastewater , making it a valuable tool for contaminants degradation.
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ChemCatChem
·
2020
·Vol. 13
·期 3
·924-933
·
IF 4.853
Jingjing Song,Fabao Zhang,Qingzhuo Hu,Wei Jiang,Dongdong Li,Bo Zhang
Graphical Dual catalysis : A dual functional CeO 2 /Cu 2 O/CuO nanocomposite was synthesized by a facile chemical method using Ce-based Ce-Al-Cu glass ribbons as a precursor. The nanocomposite can rapidly degrade azo dyes including orange II (OII), methyl orange (MO), and congo red (CR) under dark conditions with no chemical and energy input. Under visible light irradiation, the composite also showed high efficiency for the decomposition azo-free dyestuff such as methylene blue (MB) and rhodamine B (RhB). A novel dual functional CeO 2 /Cu 2 O/CuO nanocomposite was synthesized by a facile chemical method using Ce-based Ce-Al-Cu glass ribbons as a precursor. The nanocomposite can rapidly degrade azo dyes including orange II (OII), methyl orange (MO), and congo red (CR) under dark conditions with no chemical and energy input. Under visible light irradiation, the composite also showed high efficiency for the decomposition azo-free dyes such as methylene blue (MB) and rhodamine B (RhB). The excellent performances of the nanocomposite in both dark and light conditions are attributed to the synergistic effects of its composition and the nanoparticle structure that have large surface areas and contain many active sites, and to the formation of heterojunctions in the Ce/Cu Oxide. The high performance of this bi-functional catalyst made from industrially-prepared atomically homogenous amorphous metallic demonstrates the promise of high-performance catalysts based on multi-component metallic glass materials.
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