CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chenghong Sun,Enze Zhu,Chaoyang Shi,Juan Yu,Shubiao Yin,Chunxia Liu,Xiaoying Cui,Weiping Liu,Mingli Xu
The vigorous development of efficient cathode-side oxygen reduction reaction (ORR) catalysts is one of the keys to the practical application of fuel cells and Zn-air batteries (ZABs). Herein, a facile and green photochemical method is developed to synthesize pure-phase Mn 3 O 4 nanoparticles , which are uniformly anchored on nitrogen-doped reduced graphene oxide (N-rGO), followed by simple one-step annealing to highly catalytical active and stable MnO/N-rGO. The resultant MnO/N-rGO exhibits exciting ORR performance in alkaline media. Particularly, both GDE (gas diffusion electrode) half-cell and ZABs assembled from MnO/N-rGO have excellent overall performance and outstanding long-term durability, obviously better than Pt/C-based GDE half-cell and Pt/C + RuO 2 -based ZABs, respectively. It is mainly attributed to the synergistic effect between MnO nanoparticles and N-rGO support, which significantly increases the active sites and facilitates 4-electron transfer. This research paves a way for the green photochemical synthesis of transition metal oxide ORR catalysts at room temperature.
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高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 13
·2590-2598
·
IF 3.545
Hongyan Chen,Jiajing Zhou,Fuyuan Guo,Yaqian Wang,Yue Chen,Yan Liang,Yunlong Xu,Huang Zhang
Fabrication of porous micro/nanostructures with high electronic conductivity is very efficient for enhancing the electrochemical performance of transition metal oxide-based anode materials for lithium-ion batteries. Here, we successfully propose Zn2SnO4 composites functionalized using biomass-derived carbon and metal–organic framework derived MnO/C. The fabricated LC@Zn2SnO4@MnO/C composite exhibits superior electrochemical performance with a reversible capacity of 1185.6 mA h g−1 at 200 mA g−1 and maintains 552 mA h g−1 even at 2 A g−1 for 150 cycles. The significantly improved performance suggests that the unique structure constructed by MOF-derived oxide decoration and dual-carbon coating can efficiently enhance the material integrity and facilitate charge transfer upon repeated (de)lithiation processes, demonstrating a general strategy for the preparation of mixed-metal-oxide nanostructures for batteries with improved electrochemical performance.
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高影响因子
FUEL
·
2025
·
IF 7.5
Yaoqi Huang,Yanxu Wang,Lingwen Song,Yi Yuan,Shaojun Yuan
Hydrogen sulfide (H 2 S) is a hazardous and malodorous pollutant with severe environmental and health impacts. A promising approach for H 2 S removal involves coupling adsorption with low-temperature catalytic oxidation using alkaline metal oxide-loaded carbon-based materials. However, the effectiveness of these materials is often limited by pore blockage caused by metal oxides and desulfurization byproducts. N-doped carbon aerogels offer a solution to this issue due to their large specific surface area and well-developed pore structure. In this study, a novel MgO-MnO-loaded N-doped carbon aerogel (MgO-MnO/NC) was synthesized by one-step high-temperature pyrolysis of cellulose-based aerogel precursor for highly efficient low-temperature H 2 S desulfurization. The effects of pyrolysis temperature and metal oxide loading on H 2 S removal efficiency was systematically investigated. The optimized MgO-MnO/NC-600–0.3 (where 600 represents the pyrolysis temperature and 0.3 denotes the mass ratio of metal salts to cellulose) exhibited outstanding H 2 S removal performance, achieving an ultrahigh desulfurization capacity of 1696 mg/g. The desulfurization conditions, such as O 2 content and relative humidity, were found to play a crucial role in the H 2 S removal process. In situ DRIFTS and XPS analyses revealed a synergistic mechanism of reactive adsorption and catalytic oxidation on the MgO-MnO/NC surface. The desulfurization products were identified as sulfur, sulfate and metal sulfide (MgS and MnS). This study not only proposes a feasible strategy for fabricating biomass-derived aerogel carbon, but also offers valuable insights into the catalytic oxidation of H 2 S for enhancing the desulfurization performance of N-doped carbons.
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DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2021
·Vol. 32
·期 9
·3364-3371
·
IF 4.833
Zigui Luo,Xi'an Fan,Yanglin Zhang,Zhenjia Yang,Jian Wang,Zhaoyang Wu,Xin Liu,Guangqiang Li,Yawei Li
Fe-Si soft magnetic composites (SMCs) coated with MnO-SiO 2 composite coatings were fabricated via sintering the ball milled Fe-Si/MnO 2 composite powders. The transformation mechanism from MnO 2 coating to MnO-SiO 2 composite coatings was studied. The effect of MnO 2 content on the microstructure and magnetic properties of Fe-Si soft magnetic composites has also been investigated systematically. The analysis results indicated that MnO 2 would be reduced to MnO by Si in the Fe-Si particles at 780.1 ℃. When the temperature reached 985.8 ℃, the generated MnO and SiO 2 would further combine to form 2MnO·SiO 2 , finally forming the MnO-SiO 2 composite coatings. With the increase of the MnO 2 content from 0.0 wt% to 10.0 wt%, the MnO-SiO 2 composite coatings became thicker, thus the saturation magnetization and permeability decreased gradually. However, exorbitant MnO 2 content above 5.0 wt% would result in excessive in-situ Fe existed in the composite coatings and obvious reduction of Si content in the Fe-Si particles due to the above solid-state reactions. Therefore, the increasing trend of the resistivity was weakened. And the 5.0 wt% MnO 2 coated Fe-Si SMCs exhibited superior comprehensive performance such as high saturation magnetization (186.5 A·m 2 /kg), good permeability (71), low total core loss (362.6 mW/cm 3 at 50 kHz).
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Tengyu Zhang,Meijia Liu,Fangyi Wu,Yuanhang Wang,Yujia Ma,Lu Wang,Fangong Kong
Magnesium hydride (MgH 2 ) is regarded as a promising solid-state hydrogen storage material with high capacity and abundant resources, while its large-scale application is limited because of the inherent thermodynamic and kinetic issues. In this study, a nitrogen-doped carbon-coated Ni/MnO nanosphere catalyst (Ni/MnO@NC) was synthesized to enhance the hydrogen storage performance of MgH 2 by lowering the operating temperature and improving kinetic properties. Incorporation of 10 wt% Ni/MnO@NC lowered the onset dehydrogenation temperature of MgH 2 to 225.2 ℃ and reduced the dehydrogenation activation energy to 97.68 kJ/mol. At temperatures as low as 50 ℃, MgH 2 -Ni/MnO@NC composite achieved 2.92 wt% hydrogen absorption within 30 min. Moreover, the composite retains 97.4 % of its initial capacity after 30 cycles. Mechanistic analysis indicates that the superior hydrogen storage performance arises from synergistic catalysis among intermediate and derived phases, including the hydrogen pump effect of Mg 2 Ni/Mg 2 NiH 4 , enhancement of electron transfer by multivalent Mn, and suppression of MgH 2 particle aggregation and growth by nitrogen-doped carbon. These findings put forward a promising strategy to advance the practical application of MgH 2 in hydrogen storage systems.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Gangsheng Zhang,Yi Wang,Meng Chen,Jixiang Xu,Lei Wang
In this work, a carbon-doped Co 3 S 4 /CoSO 4 /MnO catalyst (C@CoSOMn) was prepared in this work by using ZIF-67 as the template. The prepared catalyst was used to degrade levofloxacin (LEVO) by activating peroxymonosulfate (PMS). The optimized catalyst could degrade 97.73 % LEVO within 20 min with a rate constant of 0.294 min −1 . The combination of water-soluble CoSO 4 and Co 3 S 4 made more Co sites accessible to PMS for lasting decomposition to produce active species. Moreover, Mn species with low redox potential could promote the regeneration of Co 3+ and the activation of PMS. The doped carbon could facilitate the transfer of electron. Superoxide radicals (⋅O 2 − ), bulk and surface hydroxyl radicals (•OH), surface sulfate radicals (SO 4 •− ), and electron transfer process, especially the singlet oxygen ( 1 O 2 ) were involved in the LEVO degradation. This study sheds light on the synergism between the Co-based sulfide and the Mn oxide in the activation process of PMS, and might prompt the development of other ZIF-67-derived hybrid materials for environmental remediation.
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DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Yao Zhao,Shu Zhang,Wang Yao,Yuxuan Zhu,Jing Qian,Juan Yang,Nianjun Yang
Hierarchically nanostructured binary transition metal oxide-based materials with high conductivity and catalytic activity are quite attractive for the electrochemical quantitative detection of environmental pollutants due to their natural abundance, variable oxidation state, and excellent synergies between metal sites. Herein, a new hierarchical MnO–Fe 3 O 4 @C/expanded graphite (EG) composite is designed and synthesized through a simple and in situ annealing method with the utilization of bimetallic organic framework (FeMn-MOF)/EG precursor. The synthesized MnO–Fe 3 O 4 @C/EG composite possesses a unique hierarchical nanoarchitecture that small-sized bimetallic oxide nanoparticles of 10–40 nm completely encapsulated by amorphous carbon layers of 2–4 nm are uniformly distributed on the EG platform. This distinctive structure combines the advantages of high conductivity, excellent catalytic activity, and strong stability. Resultantly, when it is applied to monitor environmental endocrine disruptors , the sensor exhibits a significant catalytic effect on the electrochemical oxidation of bisphenol A (BPA), inducing an amplified response current. In addition, the sensor shows a wide linear range of 1–50 μM and 50–400 μM for the BPA monitor, giving a sensitivity of 5208.8 and 1641.9 μA mM −1 cm −2 , respectively. This study offers a new approach to design hierarchical binary metal oxide-based sensing materials as well as to explore their electrochemical properties and applications for the determination of emerging contaminants.
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Rong Su,Zeyi Wang,Maojie Zhao,Feng Xiao,Luyao Zhang,Lu Yang,Zongjian Wu,Jinwei Bai,Ping He
Metal-organic frameworks (MOFs) derived materials have distinctive structures and conspicuous catalytic performance, making them extensively employed as catalysts in several fields. Herein, MnO/carbon nanofiber has been successfully generated by pyrolyzing Mn-MOF/bacterial cellulose (BC) composite, in which BC serves as a structural support for the growth of Mn-MOF. The characterizations of field-emission scanning electron microscopy, X-ray diffraction and Fourier-transform infrared spectroscopy demonstrate the effective synthesis of MOFs-derived MnO that maintains its original octahedral structure. MnO/carbon nanofiber is applied as a catalyst to activate peroxymonosulfate (PMS) for the degradation of tetracycline (TC), exhibiting remarkable catalytic activity with 90.59% TC decomposition generated after 30 min. Meanwhile, the removal efficiency for TC remains 83.38% after five cycles. Besides, the quenching experiments confirm not only synergistic effect of radical and non-radical species, but also the vital role of singlet oxygen ( 1 O 2 ) in MnO/CBC-PMS system. This work constructs a new pathway in the preparation of high-performance MOFs-derived metal oxides/carbon materials, which have the potential to enhance the activity in activating peroxymonosulfate for effluent disposal.
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2017
·
IF 3.887
Xiaoxin Yang,Li Zhao,Luyi Zheng,Meiyun Xu,Xiulan Cai
An efficient surface engineering strategy for MnO nanoparticles was developed to attain enhanced colloidal stability, selective uptake by and toxicity to specific cancer cells. Specifically, MnO nanoclusters prepared by polyol method were grafted with polyglycerol (MnO-PG), and then conjugated with arginine-glycine-aspartate peptide (MnO-PG-RGD) through stepwise organic reactions. The physicochemical properties of the surface engineered MnO nanoclusters were characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, dynamic light scattering, zeta potential, transmission electron microscopy and high-resolution transmission electron microscopy. The grafted PG layer not only largely enhanced the dispersibility and colloidal stability of MnO nanoclusters in physiological media, but also effectively inhibited non-specific cellular uptake of MnO-PG. MnO-PG-RGD was selectively taken up by human glioblastoma U87MG cells overexpressing α vβ3 integrins through receptor-mediated endocytosis. The internalized MnO-PG-RGD was mainly located in the lysosomes of U87MG cells. The acidity of lysosomes accelerated Mn 2+ ions releasing, which promoted intracellular oxidative stress and further led to cell damage and apoptosis. The results indicate that appropriate surface functionalization can enable MnO nanoparticles to act as a potential anticancer agent in addition to their MRI functionality.
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DOI
PubMed
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Huipei Zhang,Shengfan Fang,Mengyuan Guo,Zheng Fang,Luyao Qi,Liping Guo,Yanmin Qin,Haifeng Bao
Heterostructure MnO/MnSe nanoparticles, encapsulated in a nitrogen-doped carbon shell (MnO/MnSe@NC), were synthesized as anode materials using a hydrothermal approach followed situ calcination and selenization process. The NC shell, possessing high electronic conductivity , can function as a substrate to prevent nanoparticle agglomeration and mitigate volume variations. The porous nanostructures can shorten the ion diffusion path and increase active sites, thereby accelerating ion migration and ultimately enhancing battery capacity. Moreover, the MnO/MnSe heterostructure can facilitate Li + /Na + diffusion, leading to improved rate performance. Benefiting from the structural advantage of MnO/MnSe heterostructure nanoparticles encapsulated within a nitrogen doped carbon shell, this electrode demonstrates exceptional electrochemical performance as an anode for LIBs , including a high discharge capacity (1740 mAh g −1 at 0.1 A g −1 ), remarking rate capability (849.9 mAh g −1 at 15.0 A g −1 ), and superior cycling stability (802 mAh g −1 over 1500 cycles at 5.0 A g −1 ). Meanwhile, the MnO/MnSe@NC serves as an anode material in SIBs, demonstrating a remarkable reversible specific capacity of 902.8 mAh g −1 at 0.1 A g −1 and excellent rate capability (681.6 mAh g −1 at 15.0 A g −1 ). The present study presents a straightforward approach for fabricating the anode electrode of high-performance lithium/sodium ion batteries.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Juan Zhang,Rui Gao,Xiaona Yang,Qianyi Ma,Haoze Zhang,Weinan Zhao,Qingli Xu,Aixi Pan,Xinyi Chen,Jian Wang,Ning Chen,Xinhou Wang,Aiping Yu,Kun Zhang
Carbon-based fibrous supercapacitors (FSSCs) are promising power sources for wearable electronics, often compounding with transition metal oxides (TMOs) to improve energy density. However, conventional methods introducing TMOs onto exterior surfaces of carbon-based fibers typically degrade electrical transport and cycle stability. Herein, nanoconfined MnO@Mn 2 O 3 heterojunctions within carbon nanotube (CNT) (MOIC) composite FSSCs stabilized by Mn─O─C bonds, exhibiting record cycle stability with 95.7% capacitance retention after 10 000 cycles and 89.4% after 50 000 cycles are reported. X-ray absorption near edge structure (XANES), X-ray diffraction, and X-ray photoelectron spectroscopy (XPS) analyses confirm MnO@Mn 2 O 3 heterostructure, which arises through a partial phase transformation from MnO to Mn 2 O 3 , as further supported by density functional theory calculations. Mn─O─C chemical bonds, as verified through XPS, extended X-ray absorption fine structure, and XANES analyses, facilitate 3D electron transport, enabling MOIC composite fiber superior electrical conductivity than CNT fiber. The nanoconfinement of Mn 2+ within CNTs, driven by capillary effects and electrostatic repulsion between protonated CNTs and Mn 2+ , preserves the clean exterior surfaces of CNTs. This configuration enables the successful wet-spinning of MOIC composite fibers with three times the tensile strength of fibers without nanoconfinement. This work opens new pathways for designing carbon/metal oxide hybridized supercapacitors for wearable energy storage applications.
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高影响因子
Batteries-Basel
·
2023
·Vol. 9
·期 5
·241
·
IF 4
Da Lei,Yuyang Gao,Zhidong Hou,Lingbo Ren,Mingwei Jiang,Yunjing Cao,Yu Zhang,Jian-Gan Wang
Owing to the unique virtues of specific energy/power densities, lithium-ion capacitors (LICs) have been increasingly attracting research attention. However, the LICs are greatly restrained by the slow Li+-reaction kinetics of battery-type anodes, which is still a challenging task. In this work, we construct a superior LIC using ultrafine MnO/dual N-doped carbon (MnO/DNC) anode and activated N-doped porous carbon (ANC) derived from a homologous polypyrrole precursor. The uniform MnO ultrafine particles (~10 nm size) are well encapsulated into a dual-carbon framework, which provides fast ion/electron transportation and structural cushion for high-rate and long-durable energy storage. Accordingly, the anodic MnO/DNC achieves an impressive rate performance (179 mAh g−1@10 A g−1) and a stable 500-cycling lifespan. The as-constructed LICs could deliver a large specific energy of 172 Wh kg−1at 200 W kg−1and retain at 37 Wh kg−1even at a high specific power of 15 kW kg−1. It is believed that the design strategy of confining ultrafine conversion-type anode materials into a dual-carbon structure will expedite the development of advanced LICs.Keywords:lithium-ion capacitor;MnO;dual-carbon structure;reaction kinetics
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高影响因子
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