JOURNAL OF SOLID STATE CHEMISTRY
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2023
·
IF 3.3
Rui Yu,Zhaokuan Li,Qing Wang
In this work, MnCo 2 O 4 /Co 3 V 2 O 8 composite nanomaterials were synthesized using a straightforward secondary hydrothermal and calcination process. Importantly, Co 3 V 2 O 8 as a pseudocapacitive material with unique intercalation/delamination reaction, and the stored charge behavior of MnCo 2 O 4 material is a battery-like behavior. These two different reaction mechanisms, when working in parallel, can produce an interfacial and synergistic effect, thus providing high reversible capacity and better electrochemical activity, and the composite has good electronic conductivity and superior electrochemical properties. The prepared MnCo 2 O 4 /Co 3 V 2 O 8 nanomaterial provides a high specific capacitance of 1460 F g −1 at 1 A g −1 and an excellent capacitance retention of 84.61 % (3500 cycles even at 10 A g −1 ). Hybrid supercapacitors consisting of MnCo 2 O 4 /Co 3 V 2 O 8 and activated carbon (AC) have a great energy density of 37.5 mAh g −1 . After 28,000 turns of uninterrupted constant current charging and discharging, it had an initial capacity ratio of 98.6 %. The electrochemical performance showed that the MnCo 2 O 4 /Co 3 V 2 O 8 nanometer material has broad prospects and can provide a new idea for the electrode materials of supercapacitors.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Ranran Ding,Zhenhua Li,Chengyang Wang,Mingming Chen
In this work, yolk-shell MnCo 2 O 4 -TiO 2 microspheres were synthesized by a solvo-thermal method combined with a subsequent kinetic-controlled coating. The as-fabricated MnCo 2 O 4 -TiO 2 -50 composite shows remarkable electrochemical performance as an anode material for lithium-ion batteries, with a high specific capacity, superior cycle stability and excellent rate capabilities. At a current density of 100 mA g −1 , the composite exhibits a reversible specific capacity of 1271.5 mA h g −1 for up to 200 cycles, exhibiting stable cyclic performance. The outstanding electrochemical performance of MnCo 2 O 4 -TiO 2 -50 microspheres is due to its rational composition and structure. The porous yolk-shell structure buffers the volume change of the electrode material during charging/discharging, whereas the MnCo 2 O 4 core and TiO 2 shell synergistically assure stable cycling and satisfactory specific capacity.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jialu Ji,Qi Zhang,Hesu Mo,Zhongfei Ren,Yan Lin,Zhigang Chen,Tiina Leiviskä,Zhengying Wu
Nanosized bimetallic oxides can efficiently activate peroxymonosulfate (PMS) to degrade organic pollutants attributed to their synergetic electron transfer between the two metals. However, their scalable and controllable synthesis remains challenging. In this study, small and regular MnCo 2 O 4 nanoparticles (NPs) were successfully synthesized via a facile bio-templating method. Leaf cells were used as structure-directing agents, and the nucleation and growth of MnCo 2 O 4 were restricted in the confined space of cells, resulting in MnCo 2 O 4 spinel with an average size of 22 nm. The MnCo 2 O 4 NPs can activate PMS to achieve 99 % degradation of TC ( C 0 = 20 mg·L −1 ) within 10 min. Moreover, the MnCo 2 O 4 NPs also show a wide applicable pH range (3.0 − 11.0, RE > 94 %), excellent reusability ( RE = 96 % after four cycles), and good adaptability in the complex water matrix. Analysis of the catalytic mechanisms suggests that radical O 2 •− and non-radical 1 O 2 dominate this MnCo 2 O 4 + PMS + TC system. Besides, 17 major degradation intermediates of TC were identified (most of them were predicted to be harmless), and 3 possible degradation pathways were proposed. This study provides a feasible strategy for synthesizing spinel-structured MnCo 2 O 4 NPs, which show great potential in removing antibiotics from wastewater.
研究领域:
环境科学
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材料科学
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生物技术
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Yaoyu Tan,Mengyao Qi,Huan Jiang,Baihui Wang,Xia Zhang
The level of uric acid is crucial to human health. Octahedral oxygen vacancy MnCo 2 O 4 /Ag (V O -MnCo 2 O 4 /Ag) nanozyme was successfully prepared by simple hydrothermal, calcination and self-reduction methods. V O -MnCo 2 O 4 /Ag nanozyme is rich in Mn 2+ /Mn 3+ and C O 2+ /C O 3+ redox electron pairs, large specific surface area and oxygen vacancies. V O -MnCo 2 O 4 /Ag nanozyme showed high uricase-like activity and peroxidase-like activity. At the same time, the SERS signal of the detected molecule could be significantly enhanced after the catalytic reaction of the V O -MnCo 2 O 4 /Ag nanozyme. The K m values of V O -MnCo 2 O 4 /Ag nanozyme for H 2 O 2 and TMB were 0.04 mM and 0.027 mM respectively. Based on the uric acid oxidase-like and peroxidase-like activities of V O -MnCo 2 O 4 /Ag, we developed a label-free, sensitive, and reliable SERS uric acid detection system. The detection linear range of uric acid is 0.01 μM–1000 μM and the detection of limit is 7.8 × 10 −9 M. The results show that the sensing system has good accuracy, sensitivity, selectivity , and stability. It can be applied to the determination of samples under different conditions. This study provides profound insights into the design of enzyme-like activity regulation and SERS properties regulation of nanozymes, provides guidance for the study of reaction kinetics and catalytic mechanism of nanozymes, and has broad application prospects in the field of nanozymes and SERS sensing analysis.
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PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 58
·14478-14488
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IF 5.236
Fan Yang,Hao Guo,Yuan Chen,Mengni Xu,Wenhu Yang,Mingyue Wang,Meng Yang,Junye Zhang,Lei Sun,Tingting Zhang,Wu Yang
Graphical Nanoflower structural MnCo 2 O 4 /Ni-MOF composite prepared by in situ growth of Ni-MOF on the surface of MnCo 2 O 4 nanorods derived from Co/Mn-MOF at 600 °C has a high cycling stability and outstanding rate performance as supercapacitor electrode material. MnCo 2 O 4 is derived from a Co/Mn bimetallic metal-organic framework (MOF). Then Ni-MOF is directly grown on the surface of the obtained MnCo 2 O 4 to form a nano-flower structure with small balls. A large surface area, abundant active sites of MnCo 2 O 4 and porosity of Ni-MOF allow the prepared MnCo 2 O 4 /Ni-MOF composite material to deliver an excellent electrochemical performance. At the same time, an appropriate thermal treatment temperature of the MnCo 2 O 4 precursor is also very important for controlling the morphology of the obtained MnCo 2 O 4 and electrochemical performances of the resulted composite material including electric conductivity, specific capacitance and rate performance. The prepared MnCo 2 O 4 -600/Ni-MOF shows an ultrahigh rate performance (when the current density increases from 1 to 10 A g −1 , the capacitance retention rate is as high as 93.41 %) and good cycle stability (the assembled asymmetric supercapacitor advice delivers a capacitance retention rate of 94.74 % after 20 000 charge and discharge cycles) as well as a relatively high specific capacitance. These excellent electrochemical properties indicate that MnCo 2 O 4 /Ni-MOF has a good application prospect in the market.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Chunqiang Lu,Rongrong Deng,Ruidong Xu,Yannan Zhao,Xing Zhu,Yonggang Wei,Kongzhai Li
Chemical looping combustion (CLC) is a novel technology that offers effective CO 2 capture and power generation, which strongly relies on the properties of oxygen carrier. Here, a new type of CeO 2 /MnCo 2 O 4 oxygen carrier was prepared by dispersing CeO 2 nanoparticles on MnCo 2 O 4 microspheres for CLC of methane. The results reveal that the pure MnCo 2 O 4 shows high activity for methane combustion (methane conversion is as high as 94% at 800 °C), but the methane conversion sharply decreases to lower than 40% after 20 redox cycles, indicating poor redox stability. The presence of CeO 2 on MnCo 2 O 4 microspheres significantly improves the redox stability, which is benefited from the partial incorporation of high valence Ce 4+ cations into the MnCo 2 O 4 lattice that results in the generation of abundant oxygen vacancies due to the charge balance. Among different xCeO 2 /MnCo 2 O 4 samples, the 10% CeO 2 /MnCo 2 O 4 shows the highest stability during the successive CLC testing either in the capacity for CH 4 combustion or in the aspect of structure, which shows a capacity for CH 4 combustion at 2.22 mmol/g and the average CH 4 conversion higher than 90% on the stable state. Kinetic analysis indicates that the reduction process of recycled 10%CeO 2 /MnCo 2 O 4 can be divided into two steps (the main reduction of Co and Mn oxides, respectively) based on apparently different reaction rates, and both the two steps can be mainly described by a 1D growth of nuclei model. The activation energy for step 1 and step 2 are 32.34 kJ/mol and 88.54 kJ/mol, respectively.
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Nanoscale
·
2014
·Vol. 7
·期 6
·2568-2577
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IF 6.739
Mingying Qiu,Sihui Zhan,Hongbing Yu,Dandan Zhu,Shengqiang Wang
Ordered mesoporous MnCo2O4 nanomaterials were successfully prepared through the nanocasting route using SBA-15 and KIT-6 as hard templates. These mesoporous nanomaterials were characterized using XRD, BET, TEM, NH3-TPD, H2-TPR, NO-TPD, XPS and DRIFT. The low temperature selective catalytic reduction (SCR) activity of NO with NH3 was investigated, which revealed that 3D-MnCo2O4 using KIT-6 as a template can totally clean all NO over a wide temperature range of 100–250 °C with a gas hourly space velocity (GHSV) of 32 000 h−1, while 2D-MnCo2O4 with SBA-15 as a template had 95% conversion rate at the same condition. 3D-MnCo2O4 showed the best performance to clean NO due to its typical three-dimensional porous structure, large specific surface area, abundant active surface oxygen species and Lewis acid sites. All the results indicate that a novel, cheap catalyst for catalytic removal of NO can be designed by controlling the morphology at the nanoscale.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Bin Cui,Yunfeng Zhu,Tongrui Hu,Jingwei Liu,Jiahao Wu,Yana Liu,Jiguang Zhang,Rui Shi,Zhixin Ba,Jun Wang,Jian Yang
The exploration of non-precious metal catalysts (NPMCs) with high activity and excellent stability for the oxygen reduction reaction (ORR) is significant to develop the fuel cells and metal-air batteries (MABs) for large-scale applications. Heterointerface engineering is deemed as a prospective strategy to improve the ORR activity by modulating the inner electronic structure and enhancing the surface properties. Herein, the uniformly dispersed MnCo 2 O 4 nanoparticles on α-MnO 2 nanotubes were fabricated via a two-step route, and the nanoparticle size was regulated at different calcination temperatures to obtain MnCo 2 O 4 /α-MnO 2 catalysts (MCM-T, T = 450 ℃, 600 ℃, 750 ℃, 900 ℃). Benefiting from the large specific surface area, hierarchical porous structure and high ratio of (Mn 3+ +Mn 4+ )/Mn 2+ , the MCM-450 catalyst exhibits superior ORR activity with a half-wave potential of 0.78 V ( vs . RHE) and remarkable stability in 0.1 M KOH solution. Correspondingly, an impressive specific capacity (875.6 mAh g −1 ), a high discharge plateau (1.37 V) and a noticeable peak power density (151.1 mW cm −2 ) are achieved in MCM-450-based liquid aluminum-air batteries (LAABs), surpassing the performance of the commercial 20 wt% Pt/C catalyst (601.0 mAh g −1 , 1.31 V, and 128.2 mW cm −2 ). This work provides a new strategy on developing transition metal oxides (TMOs) catalysts and endows an opportunity for efficient sustainable energy storage.
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ACS Nano
·
2023
·
IF 17.1
Chan Guo,Yunxiang Tang,Zhengyi Yang,Tingting Zhao,Jiurong Liu,Yufei Zhao,Fenglong Wang
Carbon dioxide (CO2) hydrogenation to methane (CH4) is regarded as a promising approach for CO2 utilization, whereas achieving desirable conversion efficiency under mild conditions remains a significant challenge. Herein, we have identified ultrasmall Ru nanoparticles (∼2.5 nm) anchored on MnCo2O4 nanosheets as prospective photothermal catalysts for CO2 methanation at ambient pressure with light irradiation. Our findings revealed that MnCo2O4 nanosheets exhibit dual functionality as photothermal substrates for localized temperature enhancement and photocatalysts for electron donation. As such, the optimized Ru/MnCo2O4-2 gave a high CH4 production rate of 66.3 mmol gcat–1 h–1 (corresponding to 5.1 mol gRu–1 h–1) with 96% CH4 selectivity at 230 °C under ambient pressure and light irradiation (420–780 nm, 1.25 W cm–2), outperforming most reported plasmonic metal-based catalysts. The mechanisms behind the intriguing photothermal catalytic performance improvement were substantiated through a comprehensive investigation involving experimental characterizations, numerical simulations and density functional theory (DFT) calculations, which unveiled the synergistic effects of enhanced charge separation efficiency, improved reaction kinetics, facilitated reactant adsorption/activation and accelerated intermediate conversion under light irradiation over Ru/MnCo2O4. A comparison study showed that, with identical external input energy during the reaction, Ru/MnCo2O4-2 had a much higher catalytic efficiency compared to Ru/TiO2 and Ru/Al2O3. This study underscores the pivotal role played by photothermal supports and is believed to engender a heightened interest in plasmonic metal nanoparticles anchored on photothermal substrates for CO2 methanation under mild conditions.
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高影响因子
Inorganic Chemistry Frontiers
·
2017
·Vol. 4
·期 11
·1862-1869
·
IF 4.036
Mu Gao,Xiaofeng Lu,Maoqiang Chi,Sihui Chen,Ce Wang
Mixed transition-metal oxides (MTMOs) have attracted much research interest because of their promising applications in artificial enzymes. In this work, uniform hollow MnCo2O4 nanofibers have been fabricated via an electrospinning technique followed by a calcination process, which can be used as efficient oxidase mimics. In detail, the as-prepared hollow MnCo2O4 nanofibers display excellent oxidase-like activity toward the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) superior to their corresponding single-metal oxides without the addition of H2O2. Based on the high catalytic activity of hollow MnCo2O4 nanofibers and their inhibition effect by specific substances, the system of hollow MnCo2O4 nanofibers–TMB has potential to be applied in assays to detect sulfite and L-cysteine using a colorimetric approach with high sensitivity and selectivity. This work implies a broad application prospect of MTMOs in biosensors, environmental protection, food safety and medical science.
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Journal of Energy Storage
·
2026
·
IF 10.7
Yong Tang,Yi Li,Junyin Chen,Chun Huang,Yujing Wang,Lirong Qin,Jianwei Zhao
Eu 3+ -doped MnCo 2 O 4 nanoneedle arrays were synthesized on nickel foam via a hydrothermal method. • The incorporation of Eu 3+ optimizes the electronic structure, substantially enhancing ion adsorption and diffusion kinetics. • The resulting material exhibits outstanding specific capacitance in both supercapacitors and aqueous zinc-ion batteries. • The underlying mechanism is elucidated through in situ Raman spectroscopy, ex situ XRD/XPS. This study proposes a multi-scale rare-earth engineering strategy that integrates Eu 3+ doping into MnCo 2 O 4 nanoneedle arrays grown on nickel foam, enabling simultaneous modulation of electronic structure, defect chemistry, and nanoscale morphology. A synergistic combination of in situ Raman spectroscopy, ex situ XRD/XPS, and electrochemical analysis reveals that Eu 3+ preferentially substitutes for Co 3+ , simultaneously boosting the conductive Co 2+ population, generating abundant oxygen vacancies, and stabilizing a reversible H + -driven MnOOH phase transformation during cycling. This modulation yields a specific capacitance of 500 F/g for supercapacitors and a specific capacity of 390 mAh/g for aqueous zinc-ion batteries at 1 A/g. The assembled asymmetric supercapacitor delivers 100 Wh/kg with ∼93% capacitance retention after 4000 cycles, while the zinc-ion battery retains ∼96% capacity over 5000 cycles. This study establishes a coherent “atomic-to-nanoscale” design strategy for developing durable, high-performance electrodes, offering a scalable and materials-efficient route toward next-generation energy storage systems with potential for integration into portable electronics and grid-level storage.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·Vol. 41
·期 22
·9611-9618
·
IF 3.205
Jinhua Xiao,Wenying Zhang,Chunyan Xiong,Bo Chi,Jian Pu,Li Jian
Spinel oxides with the general formula of MnCu x Co 2−x O 4 (x = 0.1, 0.3, 0.5, 0.7 respectively) are used as coating materials on the metallic interconnect SUS 430 alloy to reduce the cathodic performance degradation by Cr poisoning and the interfacial resistance to improve the surface stability. The effect of Cu doping at the B position of spinel on the electrical conductivity and coefficient of temperature expansion (CTE) is investigated to determine the oxidation behavior and effectiveness as a protective layer. The result confirms that MnCu 0.5 Co 1.5 O 4 spinel shows highest electrical conductivity of 105.46 S cm −1 at 750 °C in air and an average CTE value of 12.27 × 10 −6 K −1 at temperature range of 20–960 °C. MnCu 0.5 Co 1.5 O 4 coating is stable enough after 2000 h cyclic oxidation at 750 °C. The growth of Cr 2 O 3 and formation of MnCr 2 O 4 in the scale layer are effectively suppressed by the presence of MnCu 0.5 Co 1.5 O 4 coating. The oxidation kinetics obeys the parabolic law with a rate constant as low as 2.76 × 10 −15 g 2 cm −4 ·s −1 and the ASR contributed by the oxide scale is 8.04 mΩ cm 2 at 750 °C. The research indicates that MnCu 0.5 Co 1.5 O 4 is a promising coating material for metallic interconnects of the intermediate temperature solid oxide fuel cells .
研究领域:
材料科学
·
能源材料
·
固体氧化物燃料电池
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表面工程
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电化学
·
高温腐蚀
·
功能涂层
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危险品化学品经营许可证（带存储）