JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Yuan Li,Shaoqian Jia,Ling-Xin Kong,Xiaotian Guo,Xinyi Lin,Dae Joon Kang,Huan Pang,Feng Yu
Accurate detection of nitrite plays a vital role in public health because excessive intake poses serious health risks. Metal-organic frameworks (MOFs) and their derivatives have emerged as a promising platforms for nitrite detection due to their adjustable structures and functionalization capabilities. In this study, we synthesized Ag/Cu-BTC by doping silver ions during Cu-BTC synthesis, followed by high-temperature carbonization to produce carbon-supported Ag-Cu bimetallic nanoparticles (Ag/Cu@C) for effective nitrite sensing. The carbon framework from MOF precursors not only enhances electrical conductivity and stability but also prevents nanoparticle aggregation. Silver addition enhances electron transfer efficiency and alters the electronic structure through synergistic interactions with copper, resulting in increased catalytic activity. The optimized Ag/Cu@C composite shows excellent sensing performance with a detection limit of 50 nM, high sensitivity (855.32 μA mM −1 cm −2 ), and a wide linear response range (0.2–10,000 μM). The sensor maintains 98.5–103.2 % recovery against 10-fold concentrations of common interferents (Cl - , NO 3 - , SO 4 2- , glucose), and retains 92.3 % initial current after 28 days, demonstrating exceptional selectivity and operational stability. These features highlight its significant potential for practical applications in environmental monitoring and food safety testing.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jing Li,Xinwei Du,Peipei Dong,Jianmin Wang,Jian Lin,Haisheng Wei
Chemoselective hydrogenation of quinoline and its derivatives is widely applicable in fine chemical production, yet it still faces grand challenges to obtain high activity and satisfactory selectivity simultaneously under mild conditions. In this study, we tuned the compositions of metallic Cu and Cu 3 N species by NH 3 treatment on CuO precursor at different temperatures. The specific catalyst after 375 °C treatment demonstrates excellent performance in the chemoselective hydrogenation of quinoline, achieving 98.8% conversion and >99% selectivity of 1,2,3,4-tetrahydroquinoline under mild reaction conditions (90 °C, 1 MPa), which significantly surpasses the performance of previously reported Cu-based catalysts. Moreover, the catalyst exhibits remarkable stability and substrate versatility. Various characterizations and DFT calculations reveal that there is obviously synergistic effect between metallic Cu and Cu 3 N species. Specifically, metallic Cu facilitates hydrogen dissociation, while Cu 3 N enhances the adsorption of quinoline molecules. These findings highlight the potential of Cu-based catalyst with dual active sites as a robust and efficient alternative for chemoselective hydrogenation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Fei Yu,Tianjie Chen,Jie Ma
Cu 2 O, as a cost-effective chloride ion (Cl − ) storage electrode material, has shown great potential in Cl − removal applications. However, in the electrochemical process, Cu 2 O as the anode is easily oxidized and dissolved by free copper ions (Cu 2+ ), leading to the loss of copper components and causing electrode performance degradation. In this work, we introduced a three-dimensional (3D) self-supporting polyvinyl alcohol/carbon nanotube (PVA/CNTs) conductive hydrogel as the carrier of Cu 2 O for capacitive deionization (CDI). Among them, PVA acts as an antioxidant to inhibit the conversion of Cu 2 O to free Cu 2+ , CNTs act as the growth carrier of copper particles to make them more evenly distributed in the electrode materials, and the 3D hydrogel structure can accommodate a large amount of water, making Cu 2 O fully contact with chloride ions in water and store them. At 1.4 V, the Cu/Cu 2 O@PVA/CNTs conductive hydrogels (Cu@CHs) demonstrate 49.58 ± 3.27 mg g −1 Cl − storage capacity and significantly superior areal Cl − storage capacity on the 13.66 ± 0.68 mg-Cl − cm −2 , and there was no significant performance degradation in 100 cycles. This study, using PVA as the core component, proposes a simple strategy for constructing high areal performance 3D materials and provides optimization ideas for solving the oxidation dissolution problem of faradaic materials in the CDI process.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Kai Zhu,Zihan Lin,Xinyi Bai,Fangfang Chang,Qing Zhang,Xiaolei Wang,Zhengyu Bai
Electrocatalytic reduction reaction of CO2 (CO2RR) into value-added multicarbon (C2+) products represents a sustainable strategy for mitigating greenhouse gas emissions and enhancing the production of high-value chemicals. Cu-based catalysts are optimal for the CO2RR, facilitating the generation of C2+ products such as ethanol, which have significant industrial applications. However, converting CO2 to C2+ products remains a great challenge, necessitating the simultaneous achievement of high current density, Faradaic efficiency (FE), and operational stability for industrial-scale implementation. Herein, we prepared Cu/Cu2O catalysts with diverse morphologies and the ratio of the Cu+/Cu interface, which was rectified by regulating the interactions between the active interface and the intermediate (*CO). The electrochemical analysis demonstrated that reconstructed Cu/Cu2O nanodendrites with dominant grain boundaries exhibited remarkable performance in generating C2+ products, achieving a Faradaic efficiency (FE) of 71.8%, including 49.7% FE of ethanol and a substantial partial current density of 390.0 mA cm–2 within the flow cell. In situ spectroscopy characterization and theoretical calculations revealed that the increased ethanol selectivity originated from the rectification of the Cu/Cu2O interface by the *CO intermediate, which accelerated H2O dissociation, reduced the free energy for *CO hydrogenation to *COH, and facilitated asymmetric *CO-*COH coupling to preferentially reduce CO2 to ethanol. This study provides profound insights into the C–C coupling pathways and sheds light on the rational design of ethanol-oriented electrocatalysts, contributing to sustainable chemical synthesis and energy utilization.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Huadong Liu,Hao Sun,XiaoYu Sun,Jing liang Cheng
This paper presents a novel tubular microreactor immobilized a photocatalyst to overcome the limitations of low light utilization and the challenges associated with catalyst recovery in traditional photocatalysis reactors. The copper-sulfur co-doped carbon quantum dots (Cu, S-CQDs)/bismuth vanadate (BiVO 4 ) composites were successfully immobilized on the inner surface of the microreactor channel through the sol–gel process. The catalytic layer in the microreactor enlarged the specific surface area and facilitated the mass transfer. Meanwhile, it also greatly reduced the consumption of chemical supplies and eliminated the need for recycling the photocatalyst. The morphology and structural features of the catalytic layer were studied by characterization. Then the photocatalytic performance of the microreactor was evaluated by photocatalytic degradation of Rhodamine B. The photocatalytic kinetics of the photocatalytic reaction in the microreactor was 0.60925, which was 10.49 times greater than that in the macroscopic system. The results showed that the microreactor led to a significant improvement in degradation efficiency. The reproducibility experiments conducted on the microreactor system further demonstrate its excellent stability. In short, integrating the beneficial properties of microreactors with Cu, S-CQDs/BiVO 4 exhibits highly promising prospects of photocatalytic applications.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
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IF 3.9
Shan Li,Huixia Li,Taotao Huang,Xuebo Chen
The development of efficient Cu–Ce catalysts for selective CO oxidation in hydrogen streams (CO-PROX) remains a critical challenge for hydrogen purification technologies. Herein, we report an acid-modified Cu–Ce/γ-Al2O3 catalyst synthesized through HCl-assisted wet impregnation and thermal aging, demonstrating exceptional low-temperature CO-PROX performance. The optimized CuCe0.8(Cl)0.2/γ-Al2O3 catalyst achieves superior CO conversion below 160 °C and maintains stable activity for 50 h at 160 °C. Mechanistic studies reveal that HCl modification induces dual enhancement effects: (1) increased Cu+ species density enhances CO adsorption capacity; (2) elevated Ce3+ concentration promotes oxygen vacancy formation for efficient O2 activation. Complementary characterization demonstrates that the acid treatment optimizes the active species dispersion and creates hierarchical pore structures in the γ-Al2O3 support, which facilitates reactant accessibility and stabilizes catalytic intermediates. The reaction mechanism involves synergistic cooperation between Cu+-mediated CO adsorption, oxygen vacancy-assisted O2 activation, and hydroxyl-assisted bicarbonate intermediate formation on the alumina support. This work establishes an effective acid-modification strategy for designing durable CO-PROX catalysts, advancing the development of a practical hydrogen purification system.
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Materials Today Communications
·
2025
·
IF 4.5
Dapeng Li,Jianghe Chen,Yang Fu,Linhai Yang
This study synthesized amorphous copper-doped carbon nitride intermediates (Cu/CN-400) via a template-free self-assembly approach using melamine as the precursor, copper sulfate pentahydrate as the copper source, and deionized water as solvent. By controlling thermal polycondensation temperature (400℃ optimal), we regulated intermediate condensation degrees and achieved transformation of copper from ionic to amorphous states. Comprehensive characterization (XRD, FTIR, SEM, TEM, XPS，BET,ICP) revealed the intermediates' morphological and physicochemical properties, enabling proposal of a formation mechanism for amorphous Cu-CN intermediates through template-free self-assembly and thermal condensation. Heterogeneous copper-doped carbon nitride catalysts derived from Cu/CN-400 intermediates demonstrated significantly enhanced Fenton-like catalytic performance, indicating broad application prospects.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wanlong Li,Yuqing Ren,Quan Feng,Xianhong Zheng,Xiangyun Zhou,Jianghui Zhao,Zhi Liu
Flexibility is critical to the dimensional stability of photothermal materials during sustainable solar water evaporation. Herein, a flexible Cu 2 O-Cu co-doped carbon (Cu 2 O-Cu@C) nanofibrous membrane was fabricated by carbonization of polyacrylonitrile (PAN)/Cu(CH 3 COO) 2 nanofiber membrane at 400 °C. This process transformed Cu(CH 3 COO) 2 into a mixture of Cu 2 O and Cu. The Cu 2 O-Cu@C membrane achieved a significantly enhanced stress at break of 3.95 MPa—a 14.6-fold enhancement over pure carbon membranes (0.27 MPa). Moreover, the membrane exhibited excellent flexibility, as it recovered its original shape within 40 ms after folding and maintained its dimensional integrity throughout 1000 bending cycles. Raman spectroscopy and molecular dynamics simulations demonstrated that Cu 2 O-Cu co-doping dramatically improves mechanical properties by (1) increasing density, which enhances structural densification, (2) introducing new interatomic energy contributions that strengthen interfacial interactions, and (3) improving stress transfer and crack inhibition to promote external force dissipation. Under one sun illumination, the Cu 2 O-Cu@C nanofibrous membrane achieved evaporation rates of 1.57 kg·m −2 ·h −1 for 3.5 % saline water and 1.61 kg·m −2 ·h −1 for actual dye wastewater. In addition, following hydrophilic hydrogel modification, the Cu 2 O-Cu@C membrane maintained a stable evaporation rate exceeding 1.76 kg·m −2 ·h −1 during 10-h indoor tests. It also showed no salt crystallization in outdoor testing, confirming its salt resistance and long-term stability for practical applications. These findings will encourage research aimed at enhancing the mechanical properties of PAN-based carbon nanofibers, which are intended for applications in flexible photothermal evaporators, wearable electronics, and related devices.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 12
·830
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IF 5.3
Hou Hongming,Long Jiajun,Li Xianglong
The chelation interaction between sodium lignosulfonate (SLS) and Cu 2+ is exploited to construct an enzyme-free creatinine sensing electrode (SLS-Cu/SPCE) via one-step electrodeposition on screen-printed carbon electrodes (SPCE). SLS chelation moderates Cu 2+ electro-reduction kinetics, resulting in finely structured Cu particles with a uniform and dense distribution. These Cu particles, with abundant unsaturated coordination sites, enhance creatinine adsorption and promote specific complexation with Cu 2+ , thereby increasing the oxidation current response for sensitive detection. The SLS-Cu/SPCE achieved a 0.12 µM detection limit, a 10–300 µM linear range, high reproducibility, and long-term stability over 28 days. Tests in human urine samples showed good agreement with enzymatic assays (relative error < 16%). The SLS-Cu 2+ coordination strategy offers a novel approach for optimizing Cu-based enzyme-free electrochemical creatinine sensors. Graphical A sodium lignosulfonate-Cu 2+ chelation strategy produces refined copper particles on SPCE with abundant unsaturated sites. These sites enhance creatinine adsorption and Cu 2+ complexation, enabling highly sensitive non-enzymatic detection (0.12 μM LOD, 10-300 μM range) with strong anti-interference and excellent stability.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·42567
·
IF 3.9
Chen Dejun,Feng Jiawei,Guan Qingqing,Zhao Mengqi,Yuan Hao,Liang Xiaoyang
This study successfully developed Cu-Mn supported catalysts on fly ash geopolymer for the oxidative removal of toluene. The surface characteristics and catalytic performance of catalysts were systematically investigated in this paper. It was found that the Cu/Mn ratio plays a crucial role in determining the catalysts’ performance, with the Geo-3 catalyst showing the highest toluene conversion rate of 90% at 296 ℃. The catalyst also exhibited the lowest activation energy of 123.0 kJ/mol, indicating its superior catalytic efficiency. The findings not only contribute to the development of cost-effective and efficient catalysts for VOCs degradation but also provide valuable insights into the influence of the Cu/Mn ratio on the catalytic properties of geopolymer-supported Cu-Mn catalysts. This research offers a promising approach for the abatement of VOCs in industrial emissions.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Shengji Wu,Menglin Lin,Xijie Cheng,Xuyan Zhao,Fan Yang,Ying Xie,Lei Che,Lijiang Hu,Wei Yang
Electrocatalytic nitrate reduction (NO 3 RR) process presents a green and sustainable approach for mitigating environmental nitrate pollution while enabling ambient NH 3 synthesis. However, it was hindered by the challenge of developing non-noble electrodes that exhibited both high activity and low cost. Herein, iron and copper-doped ZIF-8 electrocatalysts (FeCuO x @CN) with varying Fe/Cu molar ratios (Fe/Cu = 2/1, 1/1 and 1/2) were synthesized. The process involved doping iron into the ZIF-8 precursor, followed by pyrolysis at 700, 800 or 900°C to embed copper with ZIF-8. Synergistic effects between Fe and Cu were observed in the FeCuO x @CN catalysts and an appropriate molar ratio of Fe/Cu was found to effectively balance the reduction rates of NO 3 – and NO 2 – , leading to a high NH 3 yield rate. Among the synthesized catalysts, Fe 1 Cu 2 O x @CN-800 exhibited the best NO 3 RR performance, achieving an NH 3 yield rate of 1975.4 μg h −1 mg cat -1 and a faradaic efficiency of 98.3 % at −0.6 V ( vs. RHE). Furthermore, it exhibited excellent cycling stability, maintaining a faradaic efficiency above 96 % over 20 cycles. The NO 3 RR mechanism over Fe 1 Cu 2 O x @CN-800 was determined to be proceeded with a sequence of deoxygenation steps: NO 3 – → *NO 3 → *NO 2 → *NO → *NOH → *NH 2 O → *NH 2 OH → *NH 2 → *NH 3 .
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yan Lin,Min Xu,Xi Chen,Sixie Chen,Xiang Li,Wenle Yan,Ruixue Zhou,Di Chen
Solid oxide electrolysis cells (SOECs) are promising energy conversion devices capable of efficiently converting CO 2 into valuable products taken the advantage of heat and renewable electricity sources. The performance of SOECs is largely influenced by the cathode material, which governs the electrochemical reduction of CO 2 . In this work, we engineered metal-perovskite cathode by pre-depositing Cu nanocrystal onto the surface of La 0.1 Ca 0.9 Fe 0.1 Ti 0.9 O 3-δ (LCFT) cathode to well understand the effects of Cu metal nanocrystal in high temperature CO 2 reduction. This Cu nanocrystal deposition on cathode resulted in a significant reduction in polarisation resistance of SOEC by 50 % improved current density from 310 mA cm −2 to 456 mA cm −2 at 1.6 V. The cell also exhibits good stability over 100 h without obvious degradation. Extensive structural and chemical analyses indicate the deposited Cu nanocrystal facilitated the formation of oxygen vacancies and metal-oxide interface which should attribute to the enhanced electrochemical performance. This study provides new insights into the role of metal decoration in facilitating the high temperature direct CO 2 electrolysis performance.
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