Batteries-Basel
·
2025
·Vol. 11
·期 11
·418
·
IF 4.8
Lang Xu,Zhipeng Wang,Ya Li,Jie Ding,Xiang Li,Ziqian Wang,Mingjiao Wu,Qiujian Zhang,Mingwu Xiang,Wei Bai,Fangkun Li,Yongshun Liang
Copper (Cu) doping is recognized as an effective strategy to enhance the electrochemical properties of LiNi1−x−yCoxMnyO2(NCM) cathode materials. However, the influence of Cu2+doping on particle size and grain boundary fusion remains insufficiently explored. A simple microwave-assisted solution combustion synthesis method was used to introduce Cu2+into LiNi0.5Co0.2Mn0.3O2(NCM523), aiming to regulate particle size and grain boundary fusion. The results demonstrate that increasing the Cu2+doping content promotes particle growth, while an appropriate doping level reduces the degree of grain boundary fusion and cation mixing. Benefiting from these structural improvements, the optimized LiNi0.5Co0.2Mn0.29Cu0.01O2(Cu–1) cathode exhibits significantly enhanced electrochemical performance, delivering a discharge capacity of 128.6 mAh g−1after 100 cycles at 0.2 C, which is 32 mAh g−1higher than value of the undoped sample (96.6 mAh g−1). These findings underscore that tailored Cu2+doping can effectively optimize the microstructure of NCM523, leading to superior cycling stability, and provide new insights into the design of high-performance NCM cathodes.
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ANALYST
·
2025
·
IF 3.3
Chenyao Lin,Qiaoping Wu,Menglu Mao,Xuedan Qiu,Chuanfan Ding,Yinghua Yan,Dumei Ma,Qingcao Li
The global rise of carbapenemase-producing Klebsiella pneumoniae (CPKP) poses a major threat to public health due to its high morbidity and mortality rates, driven largely by the production of carbapenemase enzymes. Rapid and accurate detection of carbapenemase activity is crucial for guiding appropriate antimicrobial therapy and controlling nosocomial transmission. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) enables direct detection of carbapenem hydrolysis but is currently limited by the drawbacks of conventional organic matrices, such as high background interference, toxic solvents, and poor reproducibility. In this study, we report a novel nanocomposite matrix, GNP@Zn–Cu/MOF@Au, synthesized via a green, aqueous-phase method without toxic reagents or extreme conditions. This heterostructured material exhibited a large mesoporous surface area, excellent UV absorption, and thermal responsiveness, which enhanced signal intensity, reproducibility, and analytical sensitivity, significantly improving MALDI-TOF MS performance. When applied to the identification of carbapenemase activity in clinical CPKP isolates, the matrix achieved 100% sensitivity and specificity after 1 hour of incubation and 97.3% sensitivity after just 15 minutes. Notably, KPC-2-producing strains were detected with full sensitivity within 15 minutes, while extended incubation enabled reliable identification of low-activity enzymes such as OXA-48. These findings demonstrate the strong potential of GNP@Zn–Cu/MOF@Au as a reliable and sustainable alternative to conventional matrices for rapid and accurate detection of carbapenemase activity in clinical diagnostics.
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Journal of Physical Chemistry C
·
2025
·
IF 3.2
Wentao Ye,Wenxing Yang
Resolving the competitive adsorption of ions and water at the electrified surface is vital for understanding the local microenvironments controlling all surface reactions. Herein, we conducted thorough in situ spectroscopy studies of the microenvironments of electrified Cu during its electrochemical CO2 reduction reaction (CO2RR) utilizing in situ attenuated total reflection infrared absorption spectroscopy. The potential-dependent evolution of various solution species, including cations, anions, and interfacial water, was systematically resolved. The formation of adsorbed CO (COads), the key reaction intermediate for the CO2RR, was found to involve notable displacement of interfacial water and the formation of free H2O isolated from the bulk hydrogen-bonding framework. The general trend of ion and water movement was verified to be universal for all the utilized alkali cations (Li+, Na+, K+, and Cs+), with the cation size additionally modifying the interfacial water density. Unlike the classical view of a stationary electric double layer structure and cation effects at the electrified surface, we propose that “cation–water–COads” may be considered as a better collective elementary building block of these ubiquitous surfaces for further mechanistic discussion of CO2RR and related electrocatalytic systems.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yixin Peng,Luwen Qian,Xianbo Sun,Long D. Nghiem,Fei Pan,Jing Ji,Yongdi Liu,Zhengqing Cai
This study introduces Cu into the CoFe 2 O 4 structure via a one-step hydrothermal method, creating a polymetallic (Cu/CoFe 2 O 4 ) catalyst with synergistic dual reaction centers. Material characterization reveals that Cu incorporation facilitates the formation and maintenance of low-valent Cu + and Fe 2+ species. Synergistic Cu + /Cu 2+ and Co 2+ /Co 3+ redox couples efficiently shuttle electrons, facilitating the rapid reduction of Fe 3+ (the rate-limiting step) and boosting H 2 O 2 activation efficiency across a wide pH range. The optimized Fenton system achieved complete ofloxacin (OFX) removal within 120 min and high mineralization under neutral conditions (pH 7), exhibiting a reaction rate 19 times higher than pristine CoFe 2 O 4 . The surface-bound •OH was identified as the primary reactive species (56 % contribution) and O 2 •− as secondary contributors. During the reaction, the •OH concentration reached 411 μM within the initial 5 min followed by slower accumulation, with the secondary reaction rate constant between •OH and OFX to be 1.55 × 10 10 M −1 ·s −1 . The O 2 •− generation rate was 1.81 × 10 −8 M·s −1 , and the secondary reaction rate constant between O 2 •− and OFX was 1.08 × 10 7 M −1 ·s −1 . The dominance of surface-bound •OH provides intrinsic tolerance to bulk solution pH fluctuations, explaining the system's high efficiency at neutrality. The material maintained over 95 % efficiency in continuous-flow pilot operation over 75 h, demonstrating exceptional potential for industrial implementation. Toxicity assessment via seed germination and theoretical calculation indicated reduced ecotoxicity of treated effluent. These findings highlight the material's broad pH adaptability, practical efficacy in complex water matrices, and potential for antibiotic wastewater remediation.
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LANGMUIR
·
2025
·
IF 3.9
Zheng Cheng,Jikang Cao,Haobo Lin,Yuchen Wang,Ran Qin,Yuhao Ruan,Xinyu Hu,Jingxuan Cang,Chang Sun,Dong Qiu,Yifeng Bian,Yifei Du,Yongchu Pan
Age-related decline in bone healing capacity poses significant challenges for tooth extraction recovery in the elderly. Elevated reactive oxygen–nitrogen species (RONS) and impaired mitophagy drive this pathology. We engineered bimetallic Cu–Fe3O4 nanoclusters with oxygen vacancies (OVs) via hydrothermal synthesis. The abundant oxygen vacancies and bimetallic synergy endow Cu–Fe3O4 with exceptional enzyme-mimicking activity, enabling efficient scavenging of excess RONS and activation of mitophagy in senescent cells in vitro, thereby reversing functional decline. Owing to its excellent biocompatibility and negligible in vivo toxicity, Cu–Fe3O4 accelerates tooth extraction wound healing in aged animal models.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 6
·118066
·
IF 6.2
Rui-Hua Chen,Suniya Siddique,Hua-Jing Zhang,Ning Chen,Zhuo-Ming Xu,Zi-Long Zhang,Yue-Xing Chen,Zhuang-Hao Zheng,Fu Li
Herein, a Ti/Cu co-doping strategy is employed in Bi 2 SeS 2 to optimize its electrical and thermal transport properties through carrier regulation and microstructure modulation. The Ti/Cu co-doped Bi 2 SeS 2 samples were synthesized by mechanical alloying followed by spark plasma sintering. It is found that the co-doping boosts electrical conductivity while preserving a moderate Seebeck coefficient of 150–200 μV K −1 . This yields a high power factor of 5.5 μW cm −1 K −2 at 773 K. Moreover, the lattice thermal conductivity is reduced to ∼0.25 W m −1 K −1 , primarily due to effective phonon scattering induced by lattice strain and point defects. Finally, a peak zT of ∼0.80 is achieved at 773 K in Bi 1.96 Ti 0.04 SeS 2 -1 %Cu, surpassing the solely Cu-doped and Ti-doped counterparts by ∼22 % and 40 %, respectively. These findings reveal that multi-element doping is an effective approach for tailoring both charge and phonon transport, providing valuable insights for the design of advanced thermoelectric materials.
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FUEL
·
2025
·
IF 7.5
Shaorui Jia,Junhong Ma,Xinbo Zhang,Chaoyun Ma,Xue Yu,Zhaohui Chen,Xudong Wang,Guirong Zhang
Photothermal catalytic CO 2 hydrogenation via the reverse water–gas shift (RWGS) reaction enables sustainable CO production under mild conditions. However, the advancement of this promising technology is critically dependent on the development of high-performance catalysts, which continues to pose a key challenge in the field. Herein, a series of Cu x Zn 1-x Co 2 O 4 spinel catalysts with full solar spectrum absorption were synthesized via co-precipitation to synergize photothermal energy for efficient CO 2 conversion. The Cu/Zn co-doping strategy not only enhanced light absorption but also introduced abundant oxygen vacancies, fostering the formation of frustrated Lewis pairs (FLPs) that destabilize CO 2 ′s linear configuration and weaken C=O bonds. The optimized Cu 0.5 Zn 0.5 Co 2 O 4 catalyst demonstrated exceptional performance, achieving a CO 2 conversion rate of 418.7 mmol·g cat −1 ·h −1 with 93.1 % CO selectivity at 350 °C under light irradiation, alongside stable operation for more than 10 hours. The experimental characterization combined with theoretical calculation reveal that Cu 0.5 Zn 0.5 Co 2 O 4 possesses abundant oxygen vacancies, predominantly localized at the Zn tetrahedral sites. These structural defects play a crucial role in generating more active FLP sites, which in turn leads to significantly improved CO 2 activation efficiency. In-situ diffuse reflectance infrared Fourier transform spectroscopy ( in-situ DRIFTS) investigation elucidates key intermediates and the catalytic mechanism. This work provides a strategy for designing efficient non-precious metal photothermal catalysts through bimetallic doping and defect engineering to enhance CO 2 utilization.
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ACS Sensors
·
2025
·
IF 9.1
Huiyu Su,Chaofan Ma,Chaoqi Zhu,Jiahong Tang,Lingfei Luo,Kechen Zhou,Xiaoxia Wang,Dawen Zeng
Conventional metal oxide sensors often lack sufficient sensitivity due to limited adsorption sites. Loading clusters is an effective surface-modification strategy. In this work, CuO clusters of approximately 3 nm were highly dispersed on high-surface-area SnO2 nanoboxes. TEM confirmed the cluster sizes and dispersion degrees of the CuO clusters, while Raman and XPS collectively confirmed that CuO modifies the electronic structure of the SnO2 support and induces the formation of new oxygen vacancies. The optimized Cu/SN-2 sensor exhibited a response of 39.25 toward 10 ppm ethyl methyl carbonate (EMC) at 130 °C, which is 1.92 times higher than that of SnO2 nanoboxes (20.46 at 140 °C). The diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) indicated that CuO lowers the activation energy for EMC decomposition, producing intermediates like CO2, methanol, and ethanol at lower temperatures, thus reducing the sensor operating temperature. The density functional theory (DFT) calculations confirmed that Cu sites act as negatively charged centers, promoting EMC adsorption and enhancing sensitivity. This work offers a simple, low-cost surface modification route to improve gas sensing. Furthermore, as EMC is a common electrolyte in lithium-ion batteries, its leakage poses safety risks. Integrating such EMC sensors into battery safety systems can enable ultraearly leak warnings, helping prevent fires and explosions.
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Advanced Materials Technologies
·
2025
·Vol. 10
·期 13
·2401998
·
IF 6.2
Yongkuan Wu,Haolong Li,Jinsong Leng,Zhichun Zhang,Yanju Liu
This study successfully fabricates an ultra-lightweight buckypaper(BP)-Ni-Cu layered structure film using vacuum filtration and chemical-electroplating methods, achieving a thickness of 34 µm and a surface density of 50 g m − 2 . The film exhibits a notably low surface square resistance of 9.5 mΩ □ −1 . Regarding electromagnetic shielding performance, it exhibits exceptional effectiveness across multiple frequency bands: 96.67 dB in the Partial S-band (2.6–4 GHz), 65.05 dB in the C1 band (4–6 GHz), 64.23 dB in the C2 band (6–8 GHz), 87.04 dB in the X band (8–12 GHz), and 90.46 dB in the Ku band (12–18 GHz). In terms of mechanical properties, compared with the tensile fracture strength of 33.67 MPa of the BP film, the tensile fracture strength of the BP-Ni film is enhanced to 51.9 MPa, and that of the BP-Ni-Cu film is elevated to 49.43 MPa. Additionally, the film demonstrates good thermal stability at temperatures up to 300 ° C. It also exhibits favorable electrical conductivity. Overall, considering its excellent characteristics, including multi-band shielding and ultra-lightweight properties, this film presents a novel and highly promising solution for aerospace electromagnetic shielding applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xiaoxia Zhang,Yongjin Wang,Junjie Liao,Jiancheng Wang,Liping Chang,Weiren Bao
Coke oven gas (COG) is a hydrogen-rich byproduct whose efficient utilization requires deep removal of organic sulfur compounds such as thiophene . While Cu-based sorbents exhibit excellent desulfurization performance, the influence of precursor structural characteristics on their activity remains poorly understood. In this study, the relationship between precursor assembly and desulfurization performance of unpromoted Cu/ZnO/Al 2 O 3 sorbents was systematically elucidated. Three synthesis routes were explored to tailor precursor structures, revealing that aurichalcite-derived precursors enable superior Cu dispersion, stronger Cu-Zn interaction, and enhanced reducibility of active sites. The optimized sorbent prepared via urea hydrolysis achieved an exceptional breakthrough sulfur capacity of 29.91 mg/g—nearly twice that of hydrotalcite-derived counterparts—without the use of additional promoters. Mechanistic analysis further demonstrates that the precursor structure governs the formation of highly reducible Cu species and promotes thiophene activation through improved hydrogenation pathways. These findings provide new insights into the design of high-performance Cu-based sorbents.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2025
·
IF 6
Hengyang Liu,Wanyuan Li,Yong Xu,Enzhu Hu,Guangchao Qin,Kunhong Hu
A 1 T/2H-MoS 2 (THM) lubricant additive was synthesized via a solvothermal method to improve the lubrication of poly-alpha-olefin (PAO) and reduce the negative influence of diesel carbon soot (CS). The THM was then modified with Cu to further enhance the wear resistance. The average interlayer spacing of MoS 2 in THM and the Cu-modified THM (CTHM) was 0.99 nm, significantly larger than the 0.63 nm of 2H-MoS 2 nanoparticles. In PAO, CTHM demonstrated a 45 % improvement in friction reduction and a 77 % increase in wear resistance compared to 2H-MoS 2 . While the friction reduction of CTHM was similar to that of THM, CTHM exhibited 36 % superior wear resistance. In CS-contaminated PAO, CTHM outperformed 2H-MoS 2 with a 37 % reduction in friction and a 29 % enhancement in wear resistance. The Cu modification reduced the oxidation of CTHM and the conversion of 1 T-MoS 2 to 2H-MoS 2 in the tribofilm, contributing to improved wear resistance. The CS contamination negatively influenced the lubrication by accelerating MoS 2 oxidation, catalyzing the transition from 1 T-MoS 2 to 2H-MoS 2 , and inhibiting Cu incorporation into the tribofilm. Nonetheless, the effect of CS on CTHM and THM was less severe than on 2H-MoS 2 . This work provides an alternative method to alleviated the antagonism between MoS 2 and CS.
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CHINESE CHEMICAL LETTERS
·
2025
·
IF 8.9
Weijie Yi,Huijun Li,Mingyang Gao,Zirun Chai,Xiaomin Wang
O3-layered oxides are considered promising for various applications due to their high capacity. However, these O3-type materials are prone to undergo an irreversible O3-P3 phase transition, which adversely impacts their structural stability. Elemental doping has been identified as an effective strategy to mitigate this issue. However, substituting Cu at the redox center reduces the capacity of the pristine material. The unique introduction of the Sb element reduces the lattice oxygen ratio, leading to a significant increase in initial capacity. Thus, the Cu/Sb co-doped material NaNi 0.37 Mn 0.49 Cu 0.13 Sb 0.01 O 2 (NNMCS) with unique O3-dominated phase transition process, was successfully prepared using the high temperature solid-phase method. Cu/Sb doping increases Mn⁴⁺ concentration through the charge compensation mechanism at transition metal sites, mitigating the negative structural effects of the dual simplicial state e g orbitals in the high-spin Mn³⁺ state. Doping with Cu/Sb increases the electron cloud density at the transition metal sites, enhancing the electron shielding effect and ultimately causing the distance between the transition metal sites to expand. The increased distance between the transition metal sites indirectly promotes flexibility during transition metal migration, resulting in electrode materials with a smaller rate of lattice parameter change during cycling and ultimately enhancing phase transition reversibility. As a result, NNMCS demonstrates a high initial specific capacity of 188 mAh/g and 78% capacity retention after 200 cycles at 1 C within a 2.0–4.3 V window. This work provides valuable insights into the coupling mechanism between capacity and structural stability in layered oxides for sodium-ion batteries.
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