Journal of Materials Research and Technology-JMR&T
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2024
·
IF 6.2
Chenlong Wei,Xuexiang Wang,Peng Tong,Peng Wang,Jun Wen
Due to the low bonding strength between diamond and copper, the thermal conductivity and mechanical strength of diamond/copper composites are affected. In order to improve the interface bonding strength, this paper prepared diamond/Cu composites with titanium element in two forms: adding titanium to the copper matrix and using titanium coated diamond particles, respectively. The microstructure and composition analysis of the materials were carried out through SEM, EDS, AFM, etc. The bending strength and thermal conductivity of titanium coated diamond/copper composites reached 230 MPa and 480 W/(m·K), respectively, which were higher than the bending strength and thermal conductivity of diamond/Cu composites with added titanium in the matrix (208 MPa and 127 W/(m·K) and significantly higher than the corresponding properties of pure diamond/Cu composites (69 MPa and 108 W/(m·K)). Pre coating a layer of titanium carbide on the surface of diamond can serve as a connecting bridge, effectively reducing interfacial thermal resistance and improving mechanical properties, which is more effective than adding titanium powder to the matrix to improve the bending strength and thermal conductivity of diamond/Cu composites.
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APPLIED CLAY SCIENCE
·
2025
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IF 5.8
Cuicui Liang,Fei Zha,Xiaohua Tang,Xiaojun Guo,Haifeng Tian,Yue Chang
The misuse of antibiotics leads to the emergence of a variety of drug-resistant bacteria, which poses a serious threat to human life. Novel antimicrobial strategies are urgently needed. Herein, peroxidase-like enzyme material of Cu 2 O/NPC/Pal was prepared from Cu 2 O/nanoporous carbon (Cu 2 O/NPC) derived from Cu-MOF in the presence of palygorskite (Pal) by the pyrolysis-etching-pyrolysis strategy. Cu 2 O/NPC/Pal could catalyze the production of ·O 2 − from H 2 O 2 to cause the oxidative stress and cell membrane damage to bacteria. The antibacterial rates against Staphylococcus aureus and Pseudomonas aeruginosa reached 98.99 % and 92.70 %, respectively. In addition, Cu 2 O/NPC/Pal can promote the oxidation of glutathione and the consumption of intracellular effectively. Introduction of Pal into Cu 2 O/NPC significantly enhances the binding affinity and forms a highly concentrated substrate microenvironment. The study provided the pyrolysis strategy for the synthesis of carbon-based metal oxide nanomaterials in combination with mineral-based materials for the enhancement of peroxide-like activity in antimicrobial application.
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ACS Omega
·
2025
·
IF 4.3
Xiaoyan Wang,Xiao Wang,Wanke Chen,Jing Yuan,Qianfeng Zhang
In this study, straw biochar (TB) was prepared by pyrolysis at 500 °C, and biochar composite material (TBS) was prepared by a 1:4 mass ratio with sludge (TS). Scanning electron microscopy and Fourier transform infrared spectroscopy were utilized to characterize the material before and after adsorption. The results demonstrated that TBS possesses significant pore structure characteristics and abundant active functional groups such as hydroxyl, carboxyl, and carbonyl groups, providing a structural basis for its efficient adsorption of heavy metal ions in aqueous solutions. The adsorption performance of the remediation materials for Cu(II) and Pb(II) in aqueous solution was systematically investigated. Experimental data showed that TBS achieved maximum adsorption capacities of 60.86 and 46.98 mg/g for Cu(II) and Pb(II) at equilibrium, respectively, exhibiting superior adsorption efficiency. Through fitting analysis using adsorption kinetic models and isothermal adsorption models, it was found that the pseudo-second-order kinetic model and Freundlich isothermal model could more accurately describe the adsorption process of the two heavy metal ions, indicating that chemical adsorption was the dominant mechanism and characterized by multilayer adsorption. Thermodynamic parameter calculations revealed negative ΔG values and positive ΔH and ΔS values, suggesting that the adsorption process was a spontaneous, entropy-increasing, and endothermic reaction. These research results fully validate the excellent removal capabilities of TBS for Cu(II) and Pb(II). This study has shown that TBS can be considered a promising and cost-effective adsorbent, demonstrating its potential to adsorb heavy metal ions in water.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
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IF 4.7
Xiaochen Li,Xin Qin,Cong Yu,Lan Lin,Jinchao Cao,Qiang Chen,Shi-Peng Sun,Jingcai Chang,Xinbo Wang
Selective and efficient dehydrogenation of neat formic acid (FA) under controlled conditions, eg. light, is important yet scarce. Herein, an organic-metal heterostructurre of COF-Cu was constructed by incorporation of Cu 2+ with a covalent organic framework AQ-COF. COF-Cu showed a remarkable photocatalytic FA dehydrogenation activity, without any solvent or base additive. The optimal H 2 evolution rate reached 190 mmol·g −1 ·h −1 , surpassing most of the state-of-the-art catalyst. The significant performance enhancement of COF-Cu can be attributed to the effective charge transfer process occurring between AQ-COF and Cu 2+ . This study provides valuable insights for the design of efficient catalysts, crucial for advancing sustainable energy storage technologies.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
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IF 9.7
Runlai Liu,Qi Chen,Jinjing Qiu,Cheng Liu,Jionghua Wu,Jimmy C. Yu,Ling Wu
The construction of metal–organic frameworks that possesses the tunable metal active sites and synergistic effect for the reactant activation is an attractive strategy for the optimization of photocatalytic performance. Herein, a series of MIL-88A(Fe 1-x Cu x ) were synthesized for photocatalytic nitrogen reduction reaction (NRR). It was characterized that the Fe 2+ and oxygen vacancies were produced in MIL-88A(Fe) due to the partly reduction of ligand fumaric acid in synthesis process. The substitution of Fe 3+ with Cu 2+ induces charge imbalance and lattice distortion, further increasing the content of Fe 2+ and oxygen vacancies. The optimal sample MIL-88A(Fe 0.95 Cu 0.05 ) (CMA-5 %) exhibits the highest nitrogen fixation performance of 68.6 μmol·g −1 ·h −1 , which is 8 times higher than that of the pristine material. It is attributable to the synergistic effect of the abundant Fe 2+ and oxygen vacancies as active sites to promote N 2 coordination and photogenerated carrier separation, resulting in the efficient conversion of activated N 2 to NH 3 . Furthermore, the in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy provide clear evidence of the behavior of the N 2 adsorption and activation on the catalyst. Finally, we propose a potential mechanism at molecular level regarding the relationship between the synergistic effect and the nitrogen fixation activity.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-13
·
IF 14.7
Niu Wenzhe,Feng Jie,Chen Junfeng,Deng Lei,Guo Wen,Li Huajing,Zhang Liqiang,Li Youyong,Zhang Bo
The synthesis of multi-carbon (C 2+ ) fuels via electrocatalytic reduction of CO, H 2 O using renewable electricity, represents a significant stride in sustainable energy storage and carbon recycling. The foremost challenge in this field is the production of extended-chain carbon compounds (C n , n ≥ 3), wherein elevated * CO coverage (θ co ) and its subsequent multiple-step coupling are both critical. Notwithstanding, there exists a “seesaw” dynamic between intensifying * CO adsorption to augment θ co and surmounting the C-C coupling barrier, which have not been simultaneously realized within a singular catalyst yet. Here, we introduce a facilely synthesized lattice-strain-stabilized nitrogen-doped Cu (LSN-Cu) with abundant defect sites and robust nitrogen integration. The low-coordination sites enhance θ co and concurrently, the compressive strain substantially fortifies nitrogen dopants on the catalyst surface, promoting C-C coupling activity. The n-propanol formation on the LSN-Cu electrode exhibits a 54% faradaic efficiency and a 29% half-cell energy efficiency. Moreover, within a membrane electrode assembly setup, a stable n-propanol electrosynthesis over 180 h at a total current density of 300 mA cm −2 is obtained.
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CHEMICAL ENGINEERING SCIENCE
·
2025
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IF 4.3
Pengheng Li,Xing Zhu,Min Lin,Henglong Li
Chemical-looping preferential oxidation (CL-PROX) technology has become an efficient method for removing CO from hydrogen-rich gases. In this study, by introducing hydroxyl groups to regulate the interaction between Cu and Ce, the efficient conversion of CO and the retention of H 2 were successfully achieved, thus bringing excellent CL-PROX performance. Characterizations show that 10CuCe-OH with introduced hydroxyl groups exhibit small particle size, low crystallinity, high surface concentrations of Cu + and Ce 3+ , abundant oxygen vacancies, excellent reducibility and strong oxidation activity. This is attributed to the fact that hydroxyl groups strengthen the interaction between Cu–O–Ce, forming more Cu + –O v –Ce 3+ structures. At 200 °C, the conversion of CO over 10CuCe-OH exceeds 90 %, while the conversion of H 2 is less than 4 %, which is far superior to that of 10CuCe. The results of in-situ Fourier transform infrared spectroscopy ( In-situ FTIR) and DFT calculations indicate that 10CuCe-OH possesses excellent adsorption and CO conversion capabilities. Overall, this work provides a new strategy for the design of high efficiency CL-PROX catalysts.
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AICHE JOURNAL
·
2025
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IF 4
Lixia Li,Zhechao Huang,Menghao Jiang,Jinxing Long
A novel approach is proposed for producing 4-ethylcyclohexanol, a versatile petrochemical in the polymer industry, from the renewable lignin in the presence of Cu–Ni/MgCrO x spinel catalysts. Under the synergistic effect between the Ni 0 , Cu, + and the balanced acidic and basic properties of MgO and MgCr 2 O 4 , an exceptional yield of monomer (30.1 wt%) with 59.5% selectivity of 4-ethylcyclohexanol (yield of 17.9 wt%) was achieved when the depolymerization of bamboo lignin was performed with Cu 6 Ni 20 /MgCr 0.5 O x (Cr:Mg = 0.5). Catalyst characterization illustrated that the formation of MgCr 2 O 4 spinel, which restrained the generation of NiMgO 2 solid solution and increased the concentration of Ni 0 species, along with the surface electron effect between Ni 0 and Cu + , contributes to this superior hydrodeoxygenation performance of lignin. Mechanistic investigation further demonstrated that the conversion of lignin to 4-ethylcyclohexanol involves a tandem process of C β –O bonds cleavage, demethoxylation, and saturated hydrogenation. Therefore, this work provides new insights on lignin utilization.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zheng Tang,Yongjia Li,Lanlan Shi,Kaixin Zhang,Yingjie Ji,Xiaoxuan Wang,Yebo Yao,Xia Liu,Dewei Wang,Kaiqi Nie,Jiangzhou Xie,Zhiyu Yang,Yi-Ming Yan
Direct formate fuel cells have gained traction due to their eco-friendly credentials and inherent safety. However, their potential is hampered by the kinetic challenges of the formate oxidation reaction (FOR) on Pd-based catalysts, chiefly due to the unfavorable adsorption of hydrogen species (Had). These species clog the active sites, hindering efficient catalysis. Here, we introduce a straightforward strategy to remedy this bottleneck by incorporating Pd with Cu to expedite the removal of Pd–Had in alkaline media. Notably, Cu plays a pivotal role in bolstering the concentration of hydroxyl adsorbates (OHad) on the surface of catalyst. These OHad species can react with Had, effectively unblocking the active sites for FOR. The as-synthesized catalyst of PdCu/C exhibits a superior FOR performance, boasting a remarkable mass activity of 3.62 A mg–1. Through CO-stripping voltammetry, we discern that the presence of Cu in Pd markedly speeds up the formation of adsorbed hydroxyl species (OHad) at diminished potentials. This, in turn, aids the oxidative removal of Pd–Had, leveraging a synergistic mechanism during FOR. Density functional theory computations further reveal intensified interactions between adsorbed oxygen species and intermediates, underscoring that the Cu–Pd interface exhibits greater oxyphilicity compared to pristine Pd. In this study, we present both experimental and theoretical corroborations, unequivocally highlighting that the integrated copper species markedly amplify the generation of OHad, ensuring efficient removal of Had. This work paves the way, shedding light on the strategic design of high-performing FOR catalysts.
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ACS Applied Materials & Interfaces
·
2025
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IF 8.2
Song Chen,Bingqian Zu,Qiren Jin,Xudong Wu,Zilong Xu,Liang Wu
Cu-based multinary selenide nanomaterials have garnered significant attention in photocatalytic and photovoltaic applications, owing to their unique electronic and optical properties. However, the high-yield and scalable synthesis of wurtzite colloidal Cu-based multinary selenide nanocrystals via a versatile and simple colloidal method has not yet been achieved. In this work, we report a general hot-injection colloidal method for the high-yield synthesis of a diverse library of wurtzite Cu-based quaternary selenide nanocrystals, including Cu2CdSnSe4, Cu2ZnSnSe4, Cu2FeSnSe4, Cu2CoSnSe4, Cu2MnSnSe4, Cu3InSnSe5, Cu3GaSnSe5, CuZnInSe3, CuZnGaSe3, CuCdInSe3, and Cu(InGa)Se2. As a proof of concept, the wurtzite Cu2CdSnSe4 nanocrystals are used as photocatalysts for solar-to-hydrogen production, displaying a good photocatalytic hydrogen evolution performance. Moreover, this approach has broad applicability for the high-yield synthesis of other wurtzite nanomaterials, which show significant potential for a wide range of applications.
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Catalysts
·
2025
·Vol. 15
·期 12
·1156
·
IF 4
Quan Zhou,Lewa Zhang,Ziluo Wang,Qiutong Wang,Chenyuan Zhu
Electrochemical nitrate reduction to ammonia offers a sustainable route for nitrogen fixation, yet achieving high efficiency and selectivity remains challenging. Here, a Sustainion-enabled Cu/Co tandem catalyst is developed to couple compositional synergy with ionomer-mediated interfacial regulation. The optimized Cu60Co40/Sus/C electrode delivers a Faradaic efficiency of 91.3% and an NH3yield rate of 2.63 mmol gcat.−1h−1at −0.3 V vs. RHE, surpassing Cu-Co/Nafion/C and Cu-Co/C counterparts. Structural analyses confirm that Sustainion prevents nanoparticle aggregation and maintains robust Cu/Co interfaces. Electrochemical and in situ spectroscopic studies reveal that the cationic quaternary ammonium groups of Sustainion electrostatically enrich NO3−/NO2−intermediates, facilitating their adsorption and hydrogenation toward NH3formation. The combined structural stabilization and intermediate modulation enable efficient tandem catalysis between Cu-driven nitrate activation and Co-mediated hydrogenation. This work provides molecular-level insight into ionomer–catalyst interactions and highlights interfacial engineering as a powerful strategy for sustainable ammonia synthesis.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaohui Lu,Yulin Lei,Jingxingyu Wu,Yanyu Huang,Qingqing Hao,Guochun Lv,Xiaojing Wang,Shihuai Deng,Jiali Peng,Bo Lai
The thermally activated persulfate (PDS/thermal) system has been widely explored for removing refractory organic pollutants, yet its efficiency remains constrained by energy demand and limited radical generation. In this study, Cu(II) was introduced as a homogeneous catalyst to enhance carbamazepine (CBZ) degradation in the PDS/thermal process. Under optimal conditions (40 μM Cu(II), 1 mM PDS, 60 °C), complete CBZ removal was achieved within 20 min, with the pseudo-first-order rate increased by 62 % compared to the PDS/thermal system without Cu(II). Probe experiments and density functional theory (DFT) calculations verified that SO 4 •− , • OH, and high-valent Cu(III) jointly contributed CBZ degradation, with SO 4 •− remaining the predominant reactive species. Arrhenius analysis revealed a reduction in apparent activation energy by 22.11 kJ·mol −1 , further supporting the the catalytic role of Cu(II) in facilitating O O bond cleavage and radical production. UPLC-QTOF-MS/MS identified hydroxylation, epoxidation, and deacetylation as major transformation pathways, yielding products with generally lower or comparable toxicity relative than CBZ. Moreover, the Cu(II)-PDS/thermal system demonstrated strong adaptability to pH variations, background ions, natural organic matter, and diverse organic pollutants, and maintained high efficiency in real water samples. These findings highlight the synergistic role of Cu(II) in thermal persulfate activation and provide mechanistic and practical insights for its application in the remediation of pharmaceutical-contaminated waters.
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