Surface Topography-Metrology and Properties
·
2024
·Vol. 12
·期 2
·025015
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IF 2
Lifanxing Liu,Zhiwei Guo,Xiang Rao,Huabin Yin,Chenxing Sheng,Chengqing Yuan
To improve the tribological properties of the cylinder liner-piston ring, a two-dimensional hexagonal boron nitride/copper composite lubricant additive was prepared and characterized in detail. The tribological properties and lubrication mechanism of nano hexagonal boron nitride composites with different concentrations were studied through the reciprocating friction test on the Rtec friction and wear tester. The results show that copper is successfully reduced and attached to the surface of h-BN nanosheets through the self-polymerization of dopamine, and the spherical structure promotes the interlayer slip of the nanosheets during the reciprocating friction process. The appropriate concentration of nano composite additives has excellent anti-friction and anti-wear properties. At 1 Hz and 100 N, the friction coefficient and wear quality of the nano composite additive with a concentration of 2 wt% were reduced by 29.07% and 76%, respectively. The surface Sq value and Sz value of the cylinder liner sample decreased by 68.06% and 74.47%. At the same time, under the condition of high speed and heavy load, the average wear depth of the cylinder liner sample is reduced by 61.3%. The nano composite material additive forms an excellent friction protective film on the wear surface of the cylinder liner, which can better enter the wear surface of the cylinder liner and produce a filling and repairing effect. The research results provide a method for the use of nano hexagonal boron nitride composite additives to inhibit the wear of cylinder liner-piston ring of Marine diesel engines.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Chaoqun Tan,Yanxiang Huang,Xiaochuan Lin,Peng Li,Lianghu Su,Qiongfang Wang
Recently, copper-based catalysts have become increasingly popular for peroxymonosulfate (PMS) activation due to its non-toxicity and effectiveness. In this study, we doped crystalline boron into CuO by coprecipitation and obtained a novel C-boron doped CuO catalyst (B-CuO). Characterization of materials revealed that the obtained B-CuO maintained a similar nanobelt structure to CuO. Meanwhile, BET surface area decreased from 13.32 to 12.03 m 2 /g and average pore diameter increased from 12.90 to 30.00 nm. The total pore volume also rose from 0.043 to 0.09 cm 3 /g. Compared to the CuO/PMS system, the B-CuO/PMS system showed higher ibuprofen (IBP) removal rate (92.9 % vs. 92.0 %) and k obs (0.130 min −1 vs. 0.063 min −1 ) with increased TOC removal (11.6 % vs. 8.4 %) in 30 min at 0.6 mM PMS, 0.096 g/L B-CuO, and 20 μM IBP, pH 7.5, T = 25 °C. Based on quenching tests, EPR, and LC-MS results, a possible mechanism of IBP degradation dominated by ≡Cu(III) and OH with contribution ratio of 88.45 % and 11.55 % was proposed. Hydroxyl addition, demethylation, and decarboxylation were main IBP degradation pathways. In summary, doping of C-boron into CuO substantially enhanced PMS activation for IBP degradation. However, addressing the mineralization of pollutants remained a challenge.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Wenhua Feng,Ze Xiao,Binyi Chen,Yunhong Pi,Changsong Hu,Wenli Zhang,Qingwei Meng,Tiejun Wang
As non-noble metal catalyst, Cu-based catalyst shows promising applying potential in the aqueous-phase reforming of methanol (APRM) due to its high dehydrogenation activity and low CO selectivity, but the poor thermal and hydrothermal stability. Herein, a Cu@S-1 catalyst with ultrasmall-2nm Cu nanoparticles size was synthesized for the first time using one-step in-situ encapsulation strategy. By the confinement effect of the zeolite Silicalite-1 (S-1) micropores, the 1 wt%Cu@S-1 catalyst exhibited absolutely superior thermal stability without using any other promoter, as well as relatively good hydrothermal stability. After 600–700 °C high-temperature treatment, no obvious aggregation of the Cu nanoparticles was found, and superior performance in the steam reforming of methanol (SRM) was maintained after running for 36 h at 300 °C. In the APRM at 210 °C, the 1 wt%Cu@S-1 catalyst showed six-fold higher hydrogen releasing rate (4.26 × 10 5 μ mo l H 2 · g Cu − 1 · h − 1 ) than the impregnated 1 wt%Cu/S-1-im catalyst, meanwhile it exhibited even better performance than the commercial 5%Pd/C catalyst. Compared with the impregnated 1 wt%Cu/S-1-im catalyst, the confinement effect of the internal pores of the S-1 for the Cu nanoparticles in the 1 wt%Cu@S-1 catalyst effectively inhibited aggregation of the Cu particles and Cu leaching in APRM, thus greatly improved the activity and hydrothermal stability.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Xiaoyang Fan,Pengfei Wu,Chao Qu,Ziqian Shi,Ruidong Wang,Yansheng Sun,Tingting You,Yukun Gao,Penggang Yin
Photo-induced Metal-Catalyzed Radical Polymerization (PMCR) of nitroaromatic compounds represents a highly effective strategy for synthesizing aromatic azo compounds, with broad applications across materials science, medicine, and agricultural chemistry. Cu/N/C nanosheets (NSs) substrates were prepared through thermal decomposition from Cu-based Metal-Organic Frameworks (MOFs). PMCR of 4-Aminothiophenol (PATP) to 4,4′-Dithiodianiline (DMAB) was in situ monitored on the prepared substrates by Raman spectroscopy technique. It exhibit efficient localized surface plasmon resonance effects with over 10 5 Raman enhancement factor, significantly promoting the conversion of PATP to DMAB under an applied electric field. It is attributed to the adjustment of the energy band structure of the material through N-doping and the precise control over the valence state of Cu elements within the material. This research presents a highly simple, efficient, and cost-effective strategy for accelerating the coupling reaction of nitroaromatic compounds, while also proposing a novel approach for monitoring plasma-interface reactions.
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MOLECULES
·
2024
·Vol. 29
·期 12
·2868
·
IF 4.2
Tingjin Xu,Lu Fan,Zhaokun Xiong,Bo Lai
Fe/Cu bimetallic catalysts have a synergistic effect that can effectively enhance catalytic activity, so Fe/Cu bimetallic catalysts have been extensively studied. However, the efficacy and mechanisms of Fe/Cu bimetallic catalysts’ peroxidation activation have rarely been explored. In this study, Fe/Cu bimetallic materials were fabricated to catalyze different oxidizing agents, including peroxymonosulfate (PMS), peroxydisulfate (PDS), peroxyacetic acid (PAA), and hydrogen peroxide (H2O2), for the degradation of sulfamethoxazole (SMX). The Fe/Cu/oxidant systems exhibited an excellent degradation efficiency of sulfamethoxazole (SMX). In the Fe/Cu/PMS, Fe/Cu/PDS, and Fe/Cu/PAA systems, the main reactive oxygen species (ROS) responsible for SMX degradation were hydroxyl radical (•OH) and singlet oxygen (1O2), while the main ROS was only•OH in the H2O2system. The differences in the surface structure of the materials before and after oxidation were examined, revealing the presence of a large amount of flocculent material on the surface of the oxidized PMS material. Anion experiments and actual body experiments also revealed that the PMS system had a strong anti-interference ability. Finally, a comprehensive comparison concluded that the PMS system was the optimal system among the four oxidation systems. Overall, this work revealed that the PMS oxidant has a better catalytic degradation of SMX compared to other oxidizers for Fe/Cu, that PMS generates more ROS, and that the PMS system has a stronger resistance to interference.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chaochen Chen,Fang Lei,Ying Shi,Jianjun Xie,Lei Zhang,Lingcong Fan
The surface metallization of Si 3 N 4 ceramics with the Ag–Cu conductive paste containing CuO was systematically investigated. The interfacial reactions between CuO and Si 3 N 4 promoted the surface metallization of the ceramic substrate in an argon atmosphere. The effects of Ag and Cu relative contents on the evolution of the thick film surface morphology were studied. The electrical properties and tensile strength of composite ceramic substrates were enhanced through the generation of Ag–Cu eutectic solution within the thick film layer. The effect of brazing time on the properties of Ag–Cu/Si 3 N 4 composite ceramic substrates was investigated. Mechanical testing and scanning electron microscopy (SEM) were used to analyze the interface tensile strength of the Ag–Cu/Si 3 N 4 composite substrates and the morphology of the Ag–Cu film, and the bonding mechanism of the composite ceramic substrate was studied. When the sample was brazed at 800 °C for 20 min, the maximum tensile strength of 23.6 MPa between the Ag–Cu film and ceramic substrate was obtained, the lowest resistivity of 6.22 μΩ•cm was obtained. The bonding interface between thick film layer and the ceramic substrate formed the Ag–Cu mechanical structure was benefit for improving the comprehensive performance of the Cu/Si 3 N 4 composite ceramic substrate.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 25
·15082-15089
·
IF 10.7
Zongmiao Li,Zhu Liu,Shiju Li,Yuhou Pei,Di Li,Jiale Mao,Rong Zhou,Chuntian Qiu,Yingying Lu,Bing Zhang
Electrochemical conversion of carbon dioxide (CO2RR) into high-value multi-carbon (C2+) chemicals and fuels is of great significance for carbon neutrality, and so far Cu-based materials are still the dominant electrocatalysts with practical application potential for C2+ products during the CO2RR. However, Cu-based catalysts usually face problems such as an unstable valence state and lattice structure, low efficiency, and a narrow potential window for C2+ products which affect the comprehensive performance of the catalysts. Herein, we develop a simple co-precipitation-hydrothermal method for introducing zirconium dioxide (ZrO2) into copper oxide (CuO) to improve the selectivity of C2+ products via in situ reconstruction. The optimized CuO–ZrO2-1.0 catalyst exhibits a high faradaic efficiency of 82.3% for C2+ products with an industrial partial current density over 200 mA cm−2, which presents a more than 1.7-fold improvement compared to that of CuO, also exceeding that of lots of Cu-based catalysts previously reported. DFT and in situ characterization studies reveal that the introduction of ZrO2 can induce the electronic distribution and stabilize the Cu+ species during the in situ reconstruction process which contributes to moderate adsorption and enhanced coupling of *CO intermediates to obtain C2+ products.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Jun Zhang,Yimeng Cao,Fang Chen,Mengdie Cai,Jia-qi Bai,Jiawei Xue,Jingshuai Chen,Chang-Jie Mao,Song Sun
Cocatalysts play a pivotal role in enhancing the efficiency of photocatalytic water splitting. In this study, we introduced a novel and straightforward pre-impregnation strategy to anchor a CuNi dual cocatalyst onto the surface of Al-doped SrTiO 3 (Al-STO), coupled with photodeposition. This approach led to a remarkable 11.07-fold (77.5 µmol/h) increase in hydrogen evolution performance compared to the conventional photodeposition method for decorating with CuNi dual cocatalysts. Not only that, after the 18 h cycle experiment, the catalyst still maintains high activity and high stability similar to that of precious metals, which overcomes the defects of poor stability and short life of non-precious metals. This strategy capitalizes on the pre-adsorption of cocatalyst precursor ions on the Al-STO support via impregnation, enhancing both the adsorption energy and capacity between the precursor ions and the active sites. Detailed characterizations have revealed a strong electronic interaction within the Cu-Ni structure and improved interfacial coupling between CuNi and Al-STO. This not only significantly promotes charge separation and transfer but also provides a plethora of active sites for the photocatalytic generation of H 2 . Moreover, extensive theoretical calculations have provided deep insights into the reaction mechanism of the CuNi system and elucidated the reasons behind the varying degrees of activity enhancement across different cocatalyst architectural systems.
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Catalysis Science & Technology
·
2024
·
IF 4.4
Kai Cui,Jiaming Yang,Yuli Jing,Junwen Chen,Chen Zhao,Peng Wu,Xiaohong Li
Sustainability issues have led to a gradual market expansion for the 1,4-butanediol (BDO) monomer of the biodegradable plastics to replace conventional plastics. Maleic anhydride (MA) can be derived from the oxidation of bio-based furfural or fructose. Although the hydrogenation of MA can produce a series of products, including succinic anhydride (SA), γ-butyrolactone (GBL), BDO and tetrahydrofuran (THF), the one-pot deep hydrogenation of MA to BDO or THF under mild conditions has been rarely reported in the literature until now. Herein, we report the production of BDO from the one-pot deep hydrogenation of MA over a Cu–0.03Mo/SiO2 catalyst, achieving 100% MA conversion and 88.3% BDO yield. The Cu–0.03Mo/SiO2 catalyst also showed good long-term stability without obvious loss in activity or BDO selectivity during a 160 h time-on-stream test. Doping Mo to Cu/SiO2 catalysts in an optimal amount adjusted the distribution of Cu0/Cu+ species and modulated the interaction of Cu–SiO2 and surface acidity, so that the activation of hydrogen, MA and relevant intermediates can become balanced, in addition to the restriction of side-reactions. This study provides potential for the green synthesis of BDO with non-precious Cu-based catalysts.
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LANGMUIR
·
2025
·
IF 3.9
Guoping Wang,Tian Tang,Ruichen Liu,Jingwen Li,Yi Xu,Sen Liao
By utilizing carboxylated multiwalled carbon nanotubes (MWCNT-COOH) to strengthen the interaction between the electrode and the analytes and improve the conductivity of the composite material and in conjunction with the superior catalytic properties of copper-based metal–organic framework (MOFs), a novel electrochemical sensor was fabricated from a Cu-MOF/MWCNT-COOH composite, specifically designed for the simultaneous and distinct detection of ascorbic acid (AA) and dopamine (DA). Electrochemical analyses were conducted on the innovative Cu-MOF/MWCNT-COOH electrode through both CV and DPV, revealing unique electrochemical behaviors for AA and DA. The sensor not only showed exceptional electrocatalytic properties but also distinguished itself by its broad dynamic response ranges, covering concentrations from 3 to 1800 μM for AA and from 2 to 180 μM for DA, with detection limits (S/N = 3) of 3.00 μM for AA and 0.32 μM for DA. Furthermore, this electrochemical detection platform exhibited robust reproducibility and selectivity. Examinations of serum samples yielded the recovery rates of AA and DA which were 101.9% and 102.1%, respectively, confirming the sensor’s capability to perform reliably under varied biological conditions. The findings confirm the sensor’s potential of the proposed method for the simultaneous, sensitive, and reliable detection of AA and DA. In conclusion, the electrochemical sensor has a promising potential for practical applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Wei Wei,Zhenyao Li,Jitao Shang,Chenxi Xia,Xuli Hu,Yangshun Hu,Junchen Xu,Yan Zhao,Mingyue Ding
The selective electrochemical reduction of CO to valuable multi-carbon (C 2 + ) products is a key strategy for mitigating global warming and addressing the energy crisis. Nevertheless, the activity and selectivity of CO-to-C 2+ products conversion remain low due to the lack of effective catalysts. In this study, bimetallic CuPd was grown in situ on Cu nanoparticles via a seed-mediated approach, constructing a stable CuPd/Cu interface for the CO reduction reaction (CORR). The CuPd alloy promotes CO adsorption and hydrogenation, resulting in abundant and stable *COH intermediates over catalytic sites. Consequently, a stable asymmetric coupling is established at the CuPd/Cu interface, lowering the reaction energy barrier and facilitating C-C coupling. A high acetate selectivity of 49 % was achieved at –1.0 V versus the reversible hydrogen electrode (RHE) with a current density of 349 mA/cm². This study highlights the critical role of constructing CuPd/Cu asymmetric sites for C–C coupling, paving the way for designing highly selective catalysts that enhance C 2+ product formation and acetate production.
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RARE METALS
·
2024
·
IF 9.6
Zhang Wen-Jing,Jin Li-Guo,Wu Shui-Lin,Wang Chao-Feng,Zheng Yu-Feng,Li Zhao-Yang,Cui Zhen-Duo,Jiang Hui,Zhu Sheng-Li,Liu Xiang-Mei
Deep tissue infections caused by pathogenic bacteria seriously threat the lives of patients. In this study, a smart heterostructured Au/Cu–BTA (BTA = 1,2,4,5-benzenetetramine) with microwave (MW) response is synthesized via NaBH 4 reduction of HAuCl 4 on the Cu–BTA. Au/Cu–BTA exhibits excellent hyperthermy and dynamics under MW irradiation. The MW thermal mechanism of Au/Cu–BTA is attributed to the excellent dielectric loss and polarization of the heterogeneous interface. Meanwhile, the surface energy levels of the Cu–BTA interface alleviate the difficulty of electron hopping through multistage transition. Therefore, MW can excite Cu–BTA to produce free electrons. Subsequently, Au nanoparticles rapidly increase electron transfer and inhibit electron–hole recombination. Hence, the yields of reactive oxygen species can be enhanced for MW dynamic therapy. Consequently, under 10 min of MW irradiation, Au/Cu–BTA killed 99.998% ± 0.001% of Gram-positive Staphylococcus aureus , 99.966% ± 0.014% of methicillin-resistant Staphylococcus aureus , and 96.871% ± 0.831% of Gram-negative Pseudomonas aeruginosa . The effective MW bacteria-killing strategy designed in this study shows significant potential for application in the MW-responsive treatment of deep tissue infections without antibiotics. Graphical Abstract
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