Korean Journal of Materials Research
·
2025
·Vol. 35
·期 8
·352-365
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IF 0.3
Haixia Wang,Yilei Sun,Yao Liu,Kunjie Li,Zeda Meng,Won-Chun Oh
The catalyst materials 0N-Cu-MOF, 1N-Cu-MOF, and 2N-Cu-MOF were successfully synthesized usinga solvothermal method, and using different concentrations of nitrogen-modified Cu organic frameworks (xN-Cu-MOF). Characterizations using X-ray diffraction (XRD), scanning electron microscopy (SEM), fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) surface area analysis showed that 1N-Cu-MOF had the largest SSA and pore size among the three materials synthesized. 1N-Cu-MOF exhibited the largest pore size and specific surface area among the three materials, which had a decisive effect on CO2 reduction. In addition, stability and CO2 reduction reaction (CO2RR) activity were evaluated by linear sweep voltmeter, cyclic voltmeter, electrochemical impedance spectroscopy, and time flow tests. Faradaic efficiency (FE) was determined by product analysis. Among the three catalyst materials, 1N-Cu-MOF showed the best catalytic performance at 50 mA·cm-2 (maximum current density). The charge transfer resistance was 8.23 Ω, the average current density was 19.9 mA·cm-2, and the FE of methane (CH4) production showed a high efficiency of 70.45 % when tested for 12 h at an overpotential of -0.35 V (to-RHE).
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120629
·
IF 7.2
Lijun Hu,Qian Huang,Meng Li,Ju Zhang,Qi Xue,Jiayi Wang,Caiwen Li
The parasitic dinoflagellate in Hematodinium genus causes significant economic losses to fishery and aquaculture of multiple valuable marine crustaceans. It is practically needed to develop an effective and environmentally compatible method to control the Hematodinium epidemics in mariculture. In the present study, a novel Z-scheme composite photocatalyst was synthesized successfully using Zinc oxide (ZnO) and Copper Metal-Organic Framework (Cu-MOF), The N-Cu-MOF photocatalyst showed superior charge carrier separation efficiency compared to Cu-MOF, and exhibited significantly improved visible-light absorption in contrast to the activation of ZnO only under UV light. The ZnO/N-Cu-MOF photocatalyst demonstrated excellent inactivation of Hematodinium perezi microspores, with half maximal inhibitory concentration (IC 50 ) values of 3.12 mg/L at 1 h and 1.01 mg/L at 2 h. The inactivation effects involved the generation of large amounts of intracellular reactive oxygen species (ROS), which induced oxidative stress and disrupted the membrane and flagella structural integrity of the dinospores, ultimately leading to cell necrosis induced by oxidative damage. The present study provided a new insight and approach for seawater treatment of mariculture facilities, thereby to prevent and control spreading of Hematodinium epidemics in commercially valuable crustaceans.
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FUEL
·
2025
·
IF 7.5
Zhengyang Sun,Fei Xu,Shanguang Xu,Xin Han,Shanguo Du,Jie Zhang
The selective hydrogenation of furfural (FAL) to furfuryl alcohol (FOL), catalyzed by the industrially important Cu/Al 2 O 3 catalysts, represents a significant research focus in biomass valorization. In this work, the significant promoting role of Ti modification on the performance of Cu/Al 2 O 3 for this reaction was systematically investigated using a series of Cu-xTi/Al 2 O 3 (x = 1–15 wt%) catalysts. The results revealed that at low Ti loadings (<9 wt%), Ti species were highly dispersed, formed Ti–O–Al interfacial structures with the Al 2 O 3 support, effectively increasing the number of weak acid sites and oxygen vacancies. Importantly, Ti modification optimized the metal-support interaction, enhanced the electron density of Cu species through electron transfer, significantly improved the reducibility of Cu species, and promoted the formation of metallic Cu 0 . However, excessive Ti loading (>9 wt%) led to the formation of crystalline TiO 2 particles that blocked surface active sites. The Cu-9Ti/Al 2 O 3 catalyst exhibited the best performance, achieving 100 % furfural conversion and 100 % furfuryl alcohol selectivity under reaction conditions of 85 °C, 1.0 MPa H 2 , and 4.5 h in isopropanol solvent. In situ DRIFTS experiments confirmed that the reaction followed the pathway of selective carbonyl adsorption and hydrogenation, and the formed furfuryl alcohol underwent rapid desorption, avoiding over-hydrogenation. This work elucidates the dual role of Ti modification in enhancing catalytic performance by tuning support acidity and optimizing the Cu electronic structure, providing insights for designing high-performance non-noble metal hydrogenation catalysts.
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ENERGY & FUELS
·
2025
·
IF 5.3
Qiulin Ye,Dongdong Wang,Jiabao Lv,Minghui Tang,Angjian Wu,Yaqi Peng,Shengyong Lu
The electrocatalytic CO2 conversion offers a sustainable pathway for generating ecofriendly chemicals and fuels while simultaneously enabling the storage of intermittent renewable energy. Herein, CuPd bimetallic catalysts were specifically designed through displacement reaction, with a magnetron sputtering Cu film as a substrate. The optimized CuPd catalyst achieved an ethylene Faradaic efficiency (FE) of 51.07% and a C2+ FE of 82.18% at a 200 mA/cm2 current density. In situ Raman spectroscopy indicates that the CuPd electrode exhibited a high local surface pH during the CO2 reduction reaction, which was favorable for C–C coupling. The observation of the *OCCOH intermediate by in situ FTIR, combined with density functional theory calculations, confirms that the CuPd surface promotes C–C coupling instead of direct hydrogenation. This mechanistic insight explains why the addition of Pd enhances the selectivity for C2+ products.
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FUEL
·
2025
·
IF 7.5
Lulu Peng,Shipin Wu,Ning Zhang,Jun Ren
Carbon nanotubes-loaded copper cluster catalysts (Cu x /CNT-ALD) were fabricated by atomic layer deposition (ALD) to achieve the construction of small-sized highly dispersed copper clusters in methanol oxidative carbonylation to synthesize dimethyl carbonate (DMC). The Cu/CNT-IMP catalyst was prepared by the traditional impregnation method for comparison. Owing to the distinctive surface self-limiting growth mechanism of the ALD method and the unique structure of CNT, the size of the copper clusters on the Cu10/CNT-ALD catalyst was controlled to about ∼0.48 nm and showed superior activity at ultra-low Cu loading of 0.21 wt%. Abundant oxygen-containing groups and defects on CNT provided stabilized Cu cluster immobilization sites, allowing the active Cu 0 sites to maintain a high concentration during the reaction. Cu 0 as the active species for the synthesis of DMC resulted in a turnover frequency of up to 141.0 h −1 on the optimal Cu10/CNT-ALD, which is about 14 times higher than that of Cu/CNT-IMP catalyst, and there was no significant inactivation after five cycles. This work offers insightful possibilities to investigate synthetic strategies for the preparation of cluster catalysts by atomic layer deposition and to improve DMC yields.
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Molecular Catalysis
·
2025
·
IF 4.9
Hao Huang,Wei Na,Xiangying Wang,Zhenhui Huang,Zhao Ai,Wengui Gao,Hua Wang
A detailed understanding of the role of Y in Cu/ZnO/ZrO 2 catalysts for methanol synthesis was studied by XRD, HRTEM, TPR, TPD, N 2 O titration and XPS techniques in this work. The addition of Y enhances the interaction between Cu and ZnO. With the increase of Y content, the crystal size of Cu and ZnO decreased and Cu 0 surface area increased, CO 2 /H 2 -TPD exhibited the larger CO 2 and H 2 desorption peak at relative high temperature, XPS confirmed the reduction degree of ZnO to Zn 0 on the catalyst surface also increased, and forming more Cu-ZnO x active sites. However, excess Y content leads to a much stronger interaction between Cu and ZnO, which is not beneficial for migration and stabilization of the formed ZnO x species during the reaction atmosphere, and thus generating less Cu-ZnO x sites for methanol synthesis. This work enlightens the migratable and metastabe of the formed ZnO x species on Cu surface by regulation of promoter and offers a perspective for exploring Cu-ZnO interactions in modified Cu/ZnO/ZrO 2 catalysts.
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Molecular Catalysis
·
2025
·
IF 4.9
Jilong Xiao,Yuxiang Li,Yuzhou Xia,Tuanyu Guo,Lu Chen,Shuying Zhu
Photocatalytic CO 2 reduction is a promising strategy for achieving carbon neutrality. Nevertheless, its efficiency is limited by the high energy barrier and severe charge recombination. Herein, Cu–WO 3 hollow sphere hybrids, in which Cu is anchored to the O defects of WO 3 , were fabricated to enable efficient photocatalytic conversion of CO 2 to CO. The oxygen defects in WO 3 promote the preferential deposition of Cu, resulting in the simultaneous exposure of Cu–O defect active sites. In the engineered Cu–WO 3 structure, the confined hollow morphology improves CO 2 adsorption and facilitates the separation of photogenerated electrons and holes. The Cu–O defect centers effectively reduce the overpotential for CO 2 conversion. Consequently, the synthesized Cu–WO 3 catalyst demonstrates excellent and stable photocatalytic CO 2 reduction activity, achieving a CO production rate of 1518 μL g –1 h –1 in the absence of a sacrificial agent, which is 5.2 times greater than that of pristine WO 3 . This study provides new insights into defect modulation for designing highly efficient photocatalytic materials.
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Advanced Science
·
2025
·
IF 14.1
Jiawei Gu,Qiongle Peng,Xuanqi Zhong,Yi Zheng,Zhiqiang Ma,Xiaoxian Song,Ruihuan Zhang,Bao Liu,Yanhu Zhang,Zhengbao Yang
The pursuit of multifunctional sensors has intensified due to their potential for integrated, efficient operation. However, realizing a flexible material that combines simplicity in the fabrication process with high performance and multifunctionality remains a formidable challenge. In this study, a multi-interface heterostructured nanofiber membrane composed of Polyvinylidene fluoride (PVDF), HfO 2 , and nano-copper is fabricated, leveraging the synergistic interplay of piezoelectric and piezo-phototronic effects for flexible, self-powered sensing. The incorporation of hafnium oxide (HfO 2 ) and nano-Cu enhances the crystallinity of the piezoelectric β -phase and improves the dielectric properties, substantially boosting electromechanical performance. The resultant piezoelectric sensor achieves an output voltage of 15V and maintains stability over 5000 cycles at 5 Hz, enabling precise detection of human motions. Meanwhile, the PVDF/HfO 2 -based photodetector exhibits broadband sensitivity (from near-UV to near-IR), high photoresponsivity (5.67 mA W −1 ), high detectivity (4.14×10 11 Jones), and rapid response (600 µs rising, 53 µs falling). Critically, the device demonstrates a 28.6% current enhancement under simultaneous light and pressure, highlighting a strong piezo-phototronic effect. This work presents a multifunctional fiber film for dual-mode sensing (pressure & light), with promising applications in wearable electronics and aerospace systems. Its straightforward fabrication and high performance offer a viable pathway toward next-generation, flexible, self-powered sensors.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 68
·15586-15593
·
IF 5.16
Rengui Li,Yixuan Yang,Na Sun,Long Kuai
Development of Pt group metal-free catalysts for low-temperature CO oxidation remains critical. In this work, active and stable mesoporous Cu-Ce-O x solid solutions are prepared by using spray pyrolysis. The specific surface areas and pore volumes reach as high as 170 m 2 g −1 and 0.24 cm 3 g −1 , respectively. The results of CO oxidation study suggest that (1) the catalyst obtained by spray pyrolysis possesses much higher activity than those made by co-precipitation, sol-gel, and hydrothermal methods; (2) the optimal Cu 0.2 -Ce 0.8 -O x solid solution presents a reactivity over 28 times that of both single-component CuO and CeO 2 at 70 °C. Based on the study of pure-phase Cu-Ce-O x solid solutions by selective leaching of segregated CuO x species, the active center for CO oxidation is confirmed as the bimetallic Cu-Ce-O site, whereas the individual CuO x particles not only act as spectators but also block the active Cu-Ce-O sites. A low apparent activation energy of approximately 48 kJ mol −1 is detected for CO oxidation at the Cu-Ce-O site, making Cu-Ce-O x solid solutions able to present high activity at low temperature. Furthermore, the Cu-Ce-O x catalysts exhibit excellent stability and thermal tolerance toward CO oxidation. Graphical Pt-free CO oxidation : Well-shaped mesoporous Cu-Ce-O x solid solutions were produced for low-temperature CO oxidation by using a nitrate spray pyrolysis route, and a selective leaching strategy was adopted to remove the surface segregated CuO x species. The bimetallic Cu-Ce-O site was confirmed as the active center for CO oxidation, whereas the individually segregated CuO x species not only acted as spectators, but also blocked the active Cu-Ce-O sites (see scheme).
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yakun Chen,Xiang Zhang,Enzuo Liu,Chunnian He,Yajing Han,Qunying Li,Philip Nash,Naiqin Zhao
In this study, a Cu matrix composite is synthesized reinforced by an in-situ three-dimensional graphene network (3D-GN) grown through chemical vapor deposition (CVD). Nano Cu powders and polymethylmethacrylate (PMMA) are employed as matrix and carbon source respectively. PMMA is dispersed on Cu powders after ball-milling. During the CVD process , carbon atoms from pyrolyzed PMMA diffuse and precipitate on Cu powders. By inheriting the morphology of Cu powders, carbon atoms build a 3D-GN in-situ on Cu powders. A bulk 3D graphene/composite with 0.5 wt% graphene is obtained by vacuum hot-press sintering. The favorable interfaces that crucial to the achievement of exceptional mechanical properties of a bulk composite are verified by TEM and SEM characterizations. A yield strength and tensile strength of 290 MPa and 308 MPa respectively are achieved of the composite. The structure of 3D-GN is well preserved in the bulk composite. We demonstrate that the 3D-GN serves as an effective obstacle to the propagation of dislocations by TEM further.
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Journal of Macromolecular Science Part B-Physics
·
2016
·
IF 0.62
Shaoping Yang,Shiyu Fu,Juanjuan Liu,Yiming Zhou
Hydrogels based on cellulose-graft-poly (acrylic acid) copolymers (C-g-AA) were synthesized by graft copolymerization in a phosphoric acid solvent. Fourier transform infrared (FT-IR) spectra confirmed the structure of the C-g-AA. The adsorption behaviors of the hydrogels for Cu(II) and Ni(II) were investigated. The results showed that their adsorption capacity increased as the initial concentrations of metal ions and the pH value of the solution increased. Freundlich and Langmuir isotherm models were employed to analyze the data from batch adsorption experiments. The results indicated that there were very good correlation coefficients for their linearized equations. The maximum adsorption amounts of the hydrogels for the metal ions, based on the Langmuir model, were 182 and 200 mg/g for Cu(II) and Ni(II), respectively. When the initial concentration of metal ions was 1000 mg/g the actual adsorption amounts of the hydrogels for Cu(II) and Ni(II) were 181 and 183 mg/g, respectively.
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Desalination and Water Treatment
·
2024
·
IF 1
Rong Ping Chen,Lei Yu,Cao Xing Huang,Chen Huan Lai,Ting Ting Ma,Zi Shuai Zhang,Qiang Yong
Magnetic humic acid nanoparticles (MHA) was prepared via coprecipitation method. Adsorptive removal of methylene blue (MB) and Cu(II) by MHA in single-component and binary systems was studied, respectively. MHA showed highly removal efficiency to MB and Cu(II). The adsorptions of MB and Cu(II) on MHA were pH dependent with uptake dropping in acidic solutions. The adsorption mechanisms of MB and Cu(II) were also different. MB is adsorbed via two mechanisms: π–π interactions and ion exchanging, while Cu(II) only involves ion exchanging. It was also proved that MHA can selectively remove MB in acidic solutions. The adsorption equilibrium and kinetic study indicated that the adsorption of MHA was in agreement with Langmuir model and pseundo-second-order model, respectively. Furthermore, MHA could be easily regenerated and reused with almost no loss of adsorption capacity. Overall, MHA is an efficient and versatile adsorbent for Cu(II) and MB.
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