MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Li Li,Gaoxue Jiang,Jianmin Ma
Spinel copper manganese oxide (CuMn 2 O 4 ) is synthesized via a reflux route and studied as anode for lithium-ion battery for the first time. In this work, graphene nanosheets are incorporated into the CuMn 2 O 4 composites to enhance the cycling performance of CuMn 2 O 4 material. Graphene nanosheets not only provide enough void space to buffer the volume expansion/contraction but also afford a conductive network to enhance the conductivity. The as-obtained CuMn 2 O 4 /graphene composites deliver a high discharge specific capacity of 935 mA h g −1 after 150 cycles at a current density of 50 mA g −1 . Additionally, reaction mechanism studies indicate that CuMn 2 O 4 transforms into nano-sized hybrid of CuO-MnO with a spongy porous structure during discharge-charge processes.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2020
·
IF 3.762
Chen Zhang,Aijuan Xie,Wanqi Zhang,Jianing Chang,Chenyang Liu,Linyang Gu,Xiaoxiao Duo,Fei Pan,Shiping Luo
Copper manganese oxide-graphene (CuMn 2 O 4 -RGO) composite was prepared by sol-gel method and then synthesized by physical grinding, which was further applied to electrode materials for supercapacitors. The structure and morphology of the composites were analyzed by means of characterization, such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscope (SEM), transmission electron microscopic (TEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric (TG) analysis, and Raman. The electrochemical tests including cyclic voltammetry (CV), galvanostatic charge-discharge, electrochemical impedance spectroscopy (EIS) and cyclic life were used to investigate electrochemical properties of CuMn 2 O 4 -RGO so as to optimize its composition. Through the comparison of electrochemical properties at different mass ratios, current densities and scan rates, it was found that when the mass ratio was m (CuMn 2 O 4 ): m (RGO) =1:1, the as-prepared CuMn 2 O 4 -RGO exhibited the excellent electrochemical properties. The capacitance reached 342 F g −1 at the current density of 1.0 A g −1 , which was significantly higher than that of pure CuMn 2 O 4 and RGO. The higher capacitance performance can be comparable with the reported literature value. Meanwhile, the energy density of CuMn 2 O 4 -RGO (1:1) is significantly higher than that of CuMn 2 O 4 and RGO. Therefore, CuMn 2 O 4 -RGO (1:1) composite has a good prospect as electrode material for supercapacitor.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Linfeng Nie,Shuangde Li,Shaohua Chai,Ning Han,Yunfa Chen
Photothermal catalyst oxidation of VOCs is a hot issue in the air purifier field due to the reducing of secondary energy consumption. Herein, we reported a photothermal catalyst CuMn 2 O 4 /Mn 2 O 3 with heterojunction for catalytic oxidizing toluene with high efficiency through sol–gel method followed different calcination temperature. Under the irradiation of 700 mW/cm 2 Xe lamp simulated sun light, the CuMn 2 O 4 /Mn 2 O 3 catalyst exhibited excellent full spectrum light absorption capacity, photo-thermal conversion ability and toluene conversion performance with a 90% toluene conversion (T = 233 °C, WHSV = 30,000 mL/g·h), together with a good catalytic stability. The excellent performance can be attributed to the synergistic effect of abundant oxygen vacancies, Mn 3+ active sites and heterojunctions between CuMn 2 O 4 and Mn 2 O 3 due to the XPS, H 2 -TPR, UPS characterizations.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Munirah D. Albaqami,Mehar Un Nisa,Saikh Mohammad,Jafar Hussain Shah,Ateeq Ur Rehman Baloch,Abdul Ghafoor Abid,Shahroz Saleem
For hydrogen production, the greatest emphasis is on the development of economical and efficient bifunctional electrocatalysts. In the present work, P-doped CuMn2O4 on nickel foam (NF) is prepared. For the physical and structural analysis, XRD, FTIR, SEM, and BET techniques are performed. The optimized P0.3-CuMn2O4/NF shows the best OER and HER activity compared to other concentrations and pristine CuMn2O4/NF. P0.3-CuMn2O4/NF exhibits reduced OER and HER onset potentials of 1.4 and 0.095 V vs RHE, and overpotentials of 208 and 103 mV at 10 mA cm–2, respectively. For P0.3-CuMn2O4/NF, the kinetic study utilizing Tafel slope 32 and 44 mV dec–1 suggests more rapid OER and HER processes, respectively. Furthermore, following phosphorus doping, the turnover frequency (TOF) study shows enhanced intrinsic OER (TOF = 2.3 s–1 at η = 260 mV) and HER activity (TOF = 1.3 s–1 at η = 260 mV). P0.3-CuMn2O4/NF excellent OER and HER activities are supported by the double layer capacitance (Cdl = 92 mF cm–2). Hence, P0.3-CuMn2O4/NF is a potential electrocatalyst for both processes in an alkaline environment because of its improved OER and HER performance.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Biao Zhu,Yang Qin,Jiawei Du,Fazhi Zhang,Xiaodong Lei
Electrocatalytic biomass valorization with renewable energy input represents a promising way to produce sustainable and non-fossil-based carbon products. The oxidative production of furandicarboxylic acid (FDCA) from bio-based 5-hydroxymethylfurfural (HMF) has attracted one of the most attention. Herein, spinel CuMn2O4 with an urchin-like nanostructure was synthesized by a hydrothermal method and subsequently soaked in ammonia water to create oxygen vacancies. The as-prepared material was used as an efficient electrocatalyst to oxidize HMF to FDCA. It was confirmed that CuMn2O4 etched with ammonia has an excellent electrocatalytic performance: at a current density of 20 mA/cm2, the potential of HMF oxidation was 1.31 V vs RHE in 1.0 M KOH solution with 10 mM HMF prior to the takeoff of the competing reaction, O2 evolution. Long-term chronoamperometry demonstrated that a 100% conversion of HMF and a 96% Faradaic efficiency of yield of FDCA were achieved. Our results indicated that it is feasible to employ the earth-abundant transition metal-based electrocatalyst CuMn2O4 to selectively oxidize biomass with higher energy conversion efficiency than water splitting as well as to produce valuable products in a H-type electrochemical cell.
研究领域:
电催化
·
生物质转化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Weitao Wang,Kang Wang,Huan Wang,Jiaqi Zhu,Zhen-Hong He,Zhao-Tie Liu
Selective oxidation of benzyl alcohol to benzaldehyde with molecular oxygen is a typical oxidation in synthetic chemistry. In present, Mn-Cu bimetal oxide spinel catalyst was prepared and characterized. The content of surface oxygen vacancies can be adjusted by the molar ratio of Cu to Mn during the preparation process and oxygen vacancies were found positively related to the activity of entitled reaction. The solvent effect on the reaction is investigated. The reaction conditions of the entitled reaction were optimized and the conversion of benzyl alcohol can reach 98.5 % with 100 % selectivity to benzaldehyde at 70°C for 8 h. The catalyst is stable and can be reused for 5 times without any significant decrease in its catalytic performance. In addition, the reaction was studied from the aspect of kinetic to reveal the reason of high selectivity.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2024
·
IF 3.4
Yu Wang,Bin Zhou,Jingjie Guo,Tao Liu,Yu Yang,Bing Li,Jiaojiao Yang,Yue Peng,Jianjun Chen,Wenzhe Si,Junhua Li
Developing high-performance mercury removal catalysts is essential for addressing atmospheric mercury pollution. Notably, conventional mineral adsorbents are ineffective for high-temperature flue gases (>300 °C). In this study, confinement catalysis was utilized to modify CuMn 2 O 4 . Under the chlorine-free catalytic condition, the temperature window of T 95 was widened by 150 °C (for 50–400 °C) toward high-temperature. Mechanistic studies suggest that nanoconfinement effects significantly improve the catalytic performance. Molecular oxygen adsorption and activation capacity were dramatically enhanced, as demonstrated by NAP-XPS. The plentiful grain boundaries effectively adjust the defect species and electronic structure of the catalysts in favor of Hg 0 catalysis, whereas the porous structure improves the reactant adsorption properties.
研究领域:
环境科学
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催化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Tao Wang,Yunfei Gao,Yongzhuo Liu,Minghang Song,Jingjing Liu,Qingjie Guo
Chemical looping oxidative dehydrogenation (CL-ODH) of ethane utilizes lattice oxygen of oxygen carrier, to substitute molecular oxygen, which makes high oxygen capacity as significant as ethane conversion and ethylene selectivity. Promoter were usually used to increased ethylene selectivity of bare oxygen carriers, but the overall oxygen capacity is limited to 3 wt%. In the current work, a core-shell oxygen carrier with Na 2 WO 4 as the shell material and spinel-type CuMn 2 O 4 as oxygen source was prepared. The core-shell structure were characterized by SEM, HTEM and XPS. Deep reduction with thirty consecutive ethane pulses was exhibited in a fixed bed. At 720 °C, up to 58.8% ethane conversion, 86.4% ethylene selectivity, and effective oxygen capacity up to 4.8 wt% were achieved with H 2 conversion > 90%. Furthermore, in the light of effective oxygen capacity, the phase transformation from CuMn 2 O 4 to Cu, MnO, Mn 3 O 4 and CuMnO 2 is determined as the desired phase change for this CL-ODH process. The connection between the dynamic phase change and the enlarged oxygen capacity will also shed light in future oxygen carrier design for chemical looping processes for chemical productions.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 11
·期 4
·1497-1509
·
IF 5.721
Xiaoyue Wan,Nannan Tang,Qi Xie,Shuangyan Zhao,Chunmei Zhou,Yihu Dai,Yanhui Yang
A CuMn2O4 spinel oxide was prepared via a freezing-assisted sol–gel method and used in the aerobic oxidation of 5-hydroxylmethylfurfural (HMF) toward 2,5-furandicarboxylic acid (FDCA) in aqueous solvent. A highest FDCA yield of 92.1% over the CuMn2O4 spinel oxide was achieved and the catalyst could be regenerated by calcination in air after the sixth consecutive run, outperforming several other Mn-based spinel and single oxide catalysts. Kinetic studies reveal that HMF → 2,5-diformylfuran → 5-formylfuran-2-carboxylic acid (FFCA) → FDCA is the primary reaction route of the reaction and that the oxidation of FFCA is the rate-determining step over the CuMn2O4 spinel. Characterization measurements show that Mn species enrichment and proper Mn4+/Mn3+, Cu2+/Cu+ and Cu/Mn ratios on the surface of the catalyst led to an appropriate Olatt./Oads. ratio, which facilitated oxygen mobility between the Olatt. consumption and the Olatt. generation via the refilling of oxygen vacancies. Synergistic effects between Mn and Cu in the CuMn2O4 spinel inhibit the secondary reaction and accelerate the rate-determining step rate to enhance FDCA formation.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2024
·
IF 24.4
Gongzheng Yang,Kaixuan Ma,Chengxin Wang
Manganese oxide is among the most promising cathode materials for rechargeable aqueous zinc-ion batteries due to its abundant reserves, low toxicity, and high theoretical capacity. However, the occurrence of Mn dissolution and structural collapse during the charge and discharge process, as well as the hydrogen evolution reaction, zinc dendrite formation, and corrosion on the anode surface, have seriously hindered practical applications. Here, a novel cathode material design is proposed intended to enhance both cathode and anode stability simultaneously. Specifically, an inherently stable CuMn 2 O 4 is employed as cathode material, which demonstrates good maintenance of its spinel structure during cycling. Interestingly, insertion of Zn 2+ -ions leads to the extraction of Cu 2+ -ions from CuMn 2 O 4 , subsequently in situ reduces to Cu 0 , which results in extra capacity and improves electrical conductivity. The migration of Cu 2+ ions into the Zn anode surface during the charge process eventuated the formation of copper–zinc alloys via electrodeposition. Moreover, the reconstructed anode exhibits superior stability and corrosion resistance during the Zn plating-stripping process. Consequently, the CuMn 2 O 4 electrode demonstrates a markedly improved cycle capability compared to the spinel Mn 3 O 4 electrode. This study highlights an unconventional copper electrochemistry in aqueous Zn-Mn batteries and introduces a new design principle for high-performance aqueous zinc-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Water Research & Technology
·
2024
·
IF 3.5
Junda Lai,Zizheng Huangfu,Jiewen Xiao,Zhenbei Wang,Yatao Liu,Chen Li,Fan Li,Yunhan Jia,Qiang Wang,Fei Qi,Amir Ikhlaq,Jolanta Kumirska,Ewa Maria Siedlecka,Oksana Ismailova
Catalytic ozonation is an effective method for wastewater purification. However, the low transfer of ozone in packed bubble columns leads to low ozone utilization efficiency, limited organic degradation, and high energy consumption. To address these issues, activated carbon supported catalysts, such as CuMn2O4@WAC and CuMn2O4@CSAC, have been developed, which exhibit excellent catalytic activity, stability, and high ozone utilization efficiency for the degradation of IBP in pharmaceutical wastewater. The addition of CuMn2O4@WAC or CuMn2O4@CSAC significantly increased the removal efficiency of IBP from 85% to 99%, while reducing energy consumption from 2.86 kW h m−3 to 0.80 kW h m−3 or 1.11 kW h m−3, respectively. Carboxyl groups on the surface of AC and oxygen vacancies on CuMn2O4 are key active sites for ozone adsorption and decomposition. Additionally, DFT calculations revealed that Mn–OV sites on CuMn2O4 play a crucial role in these processes, where ozone is adsorbed and decomposed into atomic oxygen and peroxide. The synergy between activated carbon supported CuMn2O4 enhances mass transfer and promotes ozone decomposition, generating highly reactive species that effectively degrade IBP in pharmaceutical wastewater. Overall, utilizing activated carbon supported CuMn2O4 for catalytic ozonation presents a promising approach for pharmaceutical wastewater treatment.
研究领域:
环境工程
·
化学工程
·
催化
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
Results in Physics
·
2019
·
IF 3.042
Yang Zhou,Xiaoyuan Liu,Ke Wang,Jing Li,Xinglai Zhang,Xin Jin,Xinyue Tang,Xiuhui Zhu,Ruishi Zhang,Xin Jiang,Baodan Liu
Series of “Hopcalite” catalysts for low-temperature CO oxidation are prepared through a facile ultra-sonic spray pyrolysis approach. It has been found that the spray pyrolysis temperature and Cu/Mn atomic ratio in initial precursors show significant impacts on the catalytic activity of Cu-Mn-O catalysts. The catalyst synthesized at 550 °C with Cu/Mn = 1/2 in precursor (Cu1Mn2-550) shows the highest catalytic activity towards CO oxidation (T 100 = 63 °C; E a = 17.04 KJ mol −1 ), owing to the formation of CuMn 2 O 4 phase with poor crystallinity. The synergistic effect of Cu and Mn species in spinel Cu-Mn-O phases attributes to the evaluated catalytic activity compared with those of pure oxides of copper or manganese towards CO oxidation. The results reveal that Cu1Mn2-550 not only provides more defects and vacancies to create more active sites, but also generates more highly active Cu (II) to promote CO oxidation. On the contrary, the decreasing amount of Cu (II) and the higher degree of crystallinity resulting from higher synthesis temperature lead to the deterioration of catalytic activity. Moreover, the phase transformation among the Cu x Mn 3-x O 4 spinels also shows significant effect on CO conversion rate. Finally, the formation mechanism of Cu-Mn-O catalysts and related CO oxidation process are discussed based on series of characterizations.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）