JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenhao Peng,Xin Min,Shiping Luo,Aijuan Xie
Transition metal oxides (TMOs) and sulfides (TMSs) have garnered significant attention as promising electrode materials for supercapacitors due to their complementary properties, including high conductivity, abundant active sites, and structural stability. The rational design and facile synthesis of TMO-TMS hybrid materials with unique architectures are critical to achieving high-performance energy storage devices. This study presents a novel CuMn 2 O 4 @CuMn 2 S 4 core-shell nanostructure developed on a nickel foam substrate through hydrothermal and sulfurization processes. The CuMn 2 O 4 core offers robust structural support and high conductivity, while the CuMn 2 S 4 shell enhances electrochemical activity and ion diffusion. The synthesized material, CuMn 2 O 4 @CuMn 2 S 4 NF-2, achieved a specific capacitance of 760.5 F·g −1 at 1.0 A·g −1 , demonstrating superior electron transfer resistance ( R ct =2.06 Ω) and excellent cycling stability, retaining 85.2 % of capacitance after 5000 cycles. Furthermore, an asymmetric supercapacitor (ASC) with CuMn 2 O 4 @CuMn 2 S 4 NF-2 as the positive electrode and activated carbon as the negative electrode delivered a maximum energy density of 35.31 Wh·kg −1 at a power density of 750 W·kg −1 and retained 75.5 % capacitance after 5000 cycles. This study underscores the significant potential of integrating oxide and sulfide materials in a single architecture, offering a promising pathway for designing high-performance energy storage systems that capitalize on the synergistic properties of both material types.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Cheng Gu,Shu Fang,Lin Liu,Benjin Chen,Lingling Xu,Min Shao,Jianan Sun,Haisheng Qian,Wanni Wang
The production of bacterial toxins and excessive accumulation of reactive oxygen species (ROS) can induce localized oxidative stress, triggering an exaggerated immune response that impedes wound healing and culminates in chronic wounds. To address this issue, a microneedle (MN) system loaded with copper-manganese oxide (CMO) is developed to modulate the hyperimmune response in wounds. CMO@MN exhibits excellent antimicrobial and anti-inflammatory properties by effectively killing bacteria, scavenging ROS, and modulating macrophage polarization through their multiple enzymatic activities and photothermal properties. RNA sequencing revealed that CMO@MN improved the therapeutic effect on the infected skin of mice by balancing the ratio of M1/M2 macrophages and promoting cell migration and angiogenesis through the regulation of relevant pathways. Overall, this CMO@MN patch skillfully balances the complex issues between the immune response and wound healing and has potential applications in the treatment of other serious bacterial infections.
研究领域:
生物医学工程
·
免疫学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Min Xu,Lei Wang,Yonggang Sun,Yulong Ma,Xin Zhang,Juan Zhang,Yingbo Zhu,Li Zhu,Song Qiao,Jinpeng Wei,Wenxin Ji,Feng Lin
Spinel is a powerful non-precious metal oxide catalyst that can be used to catalyze the combustion of volatile organic pollutants, potentially replacing precious metal catalysts. To enhance the catalytic activity and stability of CuMn 2 O 4 , we constructed gradient distribution of oxygen vacancies (V o ) on the CuMn 2 O 4-δ surface utilizing alkali treatment method. Alkali treatment dissolves some of the Cu atoms of the CuMn 2 O 4 catalyst, leading to the transformation of part of the Mn-O-Cu structure into the Mn-O structure, which was results in the lengthening of the Mn-O bond and the production of cation defects. The Mn-O bond breaks, releasing a large amount of reactive oxygen and forming oxygen vacancies. Highly reactive lattice oxygen and cation defects is more likely to participate in oxidation reactions. In the catalytic combustion of acetone, the alkali-treated catalyst showed high activity and stability, and the oxidation rate of acetone at 170 °C was increased by 2.86 times. Particularly, the alkali treatment catalysts can convert acetone that has been adsorbed into acetic acid and formic acid using catalyst lattice oxygen in anoxic environment. In the presence of an oxygen stream, the acetic and formic acids underwent direct oxidation, resulting in the formation of water and carbon dioxide. This work promotes the development of oxygen vacancy engineering on the surface of transition metal oxides and provides a new approach to improve the activity and stability of CuMn 2 O 4 in real environments.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Zhengchu Yan,Jianxin Zhu,Xiuyi Hua,Dapeng Liang,Deming Dong,Zhiyong Guo,Na Zheng,Liwen Zhang
Polyvinyl alcohol (PVA) is widely used in industries and exists in corresponding effluents. As a refractory water-soluble polymer, PVA is hard to be biologically degraded and may cause membrane blockage problem in reclaiming the wastewater. Therefore, it is necessary for PVA-containing wastewater to be pretreated. In this study, the heterogeneous catalytic ozonation to degrade PVA was investigated. The composition of catalysts was screened, the catalyst preparation and the reaction conditions were optimized, and the degradation mechanism was discussed. According to the results, γ-alumina was selected as support, copper and manganese were selected as active components, and subsequently the complex catalyst, copper-oxygen-manganese/γ-alumina (CMA), was formed. The optimal preparation conditions of CMA were as follows: molar ratio of copper to manganese was 1:2 while loading rate was 4 wt%; copper and manganese loaded on γ-alumina successively by ultrasonic impregnation at 25 °C for 2.5 h, then dried at 100 °C for 4 h, and calcined at 500 °C for 4 h. When the initial concentration of PVA solution was 20 mg/L, the optimal dosage of the catalyst for catalytic ozonation was 100 mg/L. The removal rate of PVA reached 97.8% in 15 min at pH = 7, and 99.3% in 10 min at pH = 10. The leaching of the metals in CMA could be neglected, and the catalyst still had a satisfactory result after five cycles of reuse. The catalytic ozonation followed the mechanism of hydroxyl radical reaction. Although only a small fraction of PVA was mineralized after reaction, the long chains of PVA molecules were broken into smaller pieces. Therefore, it is an effective pretreatment method for reclaiming PVA-containing wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Jinyuan Zhao,Xiai Zhang,Jianjun Wang,Xiaojun Jia,Hongchang Zhang,Feng Su,Chuncai Kong,Zhimao Yang,Tong Wang,Hao Zhu
Copper-manganese composite oxide (CuMnO x ) catalyst was prepared through an improved solvothermal reduction by short-chain dopamine (DA) with catechol structure for catalytic oxidation of toluene. The catalyst possessed the properties of controllable morphology, adjustable size, high dispersion and excellent catalytic activity. The regular hexagonal, square and spherical crystal particles with different crystal structures were synthesized by adjusting the molar ratio of copper and manganese during the reaction. Further investigation of the performance indicated that CuMnO x − 1 (Cu:Mn = 1:1) had high catalytic combustion activity with low temperatures of T 50 (205 ℃) and T 90 (221 ℃). Meantime, it has favorable stability with the basically unchanged conversion efficiency in 60 h of continuous testing.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Yuting Zhu,Ning Li,Huifang Liu,Cheng Cai,Yehong Wang,Junju Mu,Feng Wang
Oxidative catalytic fractionation (OCF) represents an efficient approach to valorize lignocellulose for coproduction of monophenols and cellulose. To achieve an adequate monophenol yield, lignin oxidation, typically, requires high O2 pressure and an excess of Cu catalysts (the Cu dosage is approximately 3–5 mol equiv relative to the aromatic units in lignin). However, these conditions are relatively harsh for cellulose, resulting in severe decomposition to aliphatic acids. To address the trade-off between the monophenol yield and cellulose production, we develop an enhanced OCF using a CuMnCeO2 solid solution as the catalyst. Under relatively mild conditions (specifically, 0.1 MPa O2), 28.7 wt % monophenols were released from birch, using catalytic amounts of Cu (the Cu dosage was about 0.03 mol equiv relative to the aromatic units in lignin). Meanwhile, up to 83.9% of cellulose was collected as a solid pulp. The synergistic effect between doped metals (Cu and Mn) and oxygen vacancies was found to be crucial for enhanced lignin oxidation under mild conditions with minimized cellulose loss. The abundant surface oxygen vacancies facilitated oxygen activation by well-dispersed Cu and Mn species, while the strong interaction between these metals enhanced the catalyst’s reducibility. Key intermediates such as β-vinyl aryl ethers and byproduct glycolic acid were identified by model experiments, confirming that lignin oxidation primarily followed a 1,2-dioxetane homolysis mechanism. Overall, this enhanced OCF demonstrates the potential viability of lignin oxidation in practical biorefinery applications.
研究领域:
化学工程
·
生物质能
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Hanxu Lu,Zhe Hu,Hong Liu,Zizhao Fu,Hanqing Dai,Wanlu Zhang,Ruiqian Guo
Transition-metal-ion-doped quantum dots (QDs) are promising candidates to fabricate full-spectrum white-light-emitting diodes (WLEDs). In this work, a series of efficient white-light-emitting Cu,Mn-codoped ZnGaS/ZnS (Cu,Mn:ZnGaS/ZnS) QDs were synthesized by controlling the Zn/Ga molar ratio and the amounts of Mn dopants. After ZnS shelling, the photoluminescence quantum yield reached 58% and the spectrum almost covered the whole visible spectrum. Further, the stepwise doping process was investigated, which had considerable reference value to subsequent research. The Cu,Mn:ZnGaS/ZnS QDs were employed to fabricate WLEDs displaying a color rendering index of 94 and CIE coordinates of (0.34, 0.35).
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 148
·期 1
·181-193
·
IF 2.799
Lin Jin,Guo Yafei,Chen Xiao,Li Changhai,Lu Shouxiang,Liew Kim Meow
Abstract Nanostructured CeO 2 supported CuO–MnO 2 (CuMn/Ce) catalysts were synthesized by wet co-impregnation method and compared with CuO/CeO 2 and MnO 2 /CeO 2 catalysts on CO oxidation. The former shows significantly higher catalytic activity toward CO oxidation than the bimetallic oxides catalysts with minimum T 50 . Dual synergistic effects in the interfaces of CuO–MnO 2 and CuO–CeO 2 shall be responsible for the higher oxidation performance of CuMn/Ce catalyst. As Cu/Mn mass ratio varies from 1/0.2 to 1/9, CO oxidation activities of the catalysts present unimodal distribution, and the catalyst with Cu/Mn = 1/1 shows the highest performance (T 50 = 45.8 °C; Ea = 24.11 kJ mol −1 ). Cu acts as CO dissociative adsorption sites, and Mn–Ce supplies activated O species from gas molecule and lattice oxygen, which are both indispensable for improving utilization efficiency of the reactants in the dual redox processes. The catalytic performance of catalyst is also vitally correlated with calcination temperature (160–320 °C). The optimum calcination temperature of CuMn/Ce catalyst is 320 °C. Catalyst characterization results indicate that the pretreatment at 320 °C is decent to obtain desired metal oxides along with fine texture properties. Graphical Abstract
研究领域:
催化化学
·
材料科学
·
环境化学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Quanli Ke,Pengyun Pan,Mei Lu,Guonan Fang,Wei Zhang,Ruina Zhang,Guokai Cui,Xiaopo Niu,Feng Xiong,Ying Zhou,Bo Zhao,Hanfeng Lu
Herein, copper and manganese heteroatoms were incorporated into the siliceous MFI frameworks with high dispersity. When employed in the CO 2 /N 2 binary gas separation, a delicate trade-off for the CO 2 adsorption capacity, adsorption heat and moisture resistance could be realized on the heteroatom-incorporated MFI zeolites, especially the Cu-incorporated one. In order to confirm the role that heteroatoms played in CO 2 adsorption, the textural analyses were then conduced, which proved that the enhanced microporosity may be at the heart of the promoted CO 2 capacity. Next to that, the in situ DRIFTs spectra were continuously tracked during the dynamic adsorption process. Compared to the commercial aluminosilicate analogue, the MFI zeolites with Cu/Mn heteroatoms possesses weaker electrostatic field intensity, which in consequence resulted in their stronger moisture resistance, even in presence of humidity up to 90 RH%. As such, a bottom-up adjustment for the adsorption properties of zeolites in practical environment containing competitive moisture impurity was shown.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 8
·1645-1650
·
IF 5.066
Jian Lin,Le Wang,Qian Zhang,Fei Bu,Tao Wu,Xianhui Bu,Pingyun Feng
Chemically co-doping a micron-sized semiconductor single crystal while simultaneously segregating different dopant types uniformly on a nanoscale is synthetically challenging, but often essential for preventing unwanted dopant-related interference that may hamper optic and magnetic applications. Here by starting from a unique molecular crystal composed of well-defined discrete supertetrahedral chalcogenide nanoclusters (NCs), we successfully realized highly effective nanosegregation of dual dopants (Cu and Mn) in Cd–In–S semiconductor crystals. Our method takes advantage of the intrinsic single vacancy at the core of NC that permits the trapping of only one dopant ion. Such single-ion trapping effectively precludes two dopant ions from residing in the same NC, allowing us to target single-crystal white-light emitter by eliminating possible interference between dopants. This new method for controlling the distribution of multiple dopants on a nanoscale provides a promising route to modify and tune optical and magnetic properties of large-sized semiconductor single crystals for use in integrated multifunctional devices.
研究领域:
材料科学
·
光学
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Jinyuan Zhao,Hongwang Yang,Zhanxin Jiang,Jingquan Wang,Chuncai Kong,Zhimao Yang,Tong Wang,Hao Zhu
The acid-activated dispersive palygorskite nanorods supported copper manganese composite oxide (CuMn/PG) was synthesized for catalytic oxidation of toluene. The palygorskite nanorods with higher purity were purified, separated and acid-activated by natural palygorskite. The pretreated palygorskite was used as the support to prepare CuMn/PG with large specific surface area, controllable morphology, adjustable size, and excellent catalytic activity through the regulation of a variety of surfactants in the process of co-precipitation. When non-ionic polyethylene glycol (PEG) was used as the surfactant, the copper-manganese oxide exhibited good dispersibility on the palygorskite nanorods. The CuMn/PG catalysts with different ratios prepared presented larger specific surface areas, which effectively solved the problem of small specific surface area of copper manganese oxide catalyst. Among them, the CuMn/PG catalyst with a copper-manganese molar ratio of 1:1 formed CuMn 2 O 4 spinel structure phase to enhance the catalysis of toluene with low temperatures of T 50 (195 °C) and T 90 (210 °C). At the same time, the CuMn/PG exhibited good stability. the removal rate of toluene still reached 98.5% after continuous operation for 60 h.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Ning Kang,Zhiqiang Zhao,Xiaoyang Yu,Jin Lin,Shouxiang Lu
The application of ceria-supported catalysts as promising catalysts for air pollutant abatement via heterogeneous catalytic processes is still a challenge. Phosphorus (P) is a potential threat to catalyst deactivation but has not been sufficiently explored. Herein, a systematic study reveals the poisoning behaviors of P on Cu-Mn bimetallic oxides supported by ceria (Cu-Mn/CeO 2 ) as a typical case in CO oxidation and provides new insights into the deactivation mechanism. The P impregnation decreases the surface area of Cu-Mn/CeO 2 and leads to the emergence of a new sheet morphology. The interactions between P and catalyst components (support and active species) result in the generation of dominant P species of PO 4 3− and PO 3 − . The P addition also weakens the oxygen storage capacity of ceria and decreases the proportions of low-valent Cu and Mn, hindering electron transfers among metals. Furthermore, the reducibility and the adsorption and activation of O 2 are limited in P-loaded Cu-Mn/CeO 2 catalysts as found in H 2 -TPR and O 2 -TPD when increasing the P concentration. In situ DRIFTS experiments demonstrate that the inhibition of the formation and transformation of active intermediates, namely carbonyls and carbonates, is responsible for the poisoning behaviors of P in the pathway of CO oxidation over Cu-Mn/CeO 2 catalyst.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）