ChemElectroChem
·
2017
·Vol. 4
·期 10
·2500-2506
·
IF 4.136
Yao Du,Chun Liu,Shuijing Sun,Songping Wu
Graphical Harsh reality : A facile solution route to monodisperse MnO@3MnFe 2 O 4 @rGO is established. As anode materials of Li-ion batteries, MnO@3MnFe 2 O 4 @rGO delivers remarkable cycling performances. Therefore, MnO@3MnFe 2 O 4 @rGO nanocomposites can be considered promising battery materials that can be operated in harsh environments. A facile high-temperature solution route to a monodisperse core-shell structure of MnO (core) and MnFe 2 O 4 (shell) (abbreviated as MFO) nanoparticles anchored on reduced graphene oxide (rGO) has been established. Subsequently, MnO@MnFe 2 O 4 @rGO nanocomposites are utilized as advanced anode materials for high-performance Li-ion batteries. MnO@3MFO@rGO containing 22.5 wt% of the rGO composite (with a 1 : 3 molar ratio of MnO/MFO) as the electrodes delivered a remarkable cycling performance, that is, 587.8 mAh g −1 at a current density of 200 mA g −1 after 200 cycles at ambient temperature with an ultralow capacity fading (0.10 % per cycle). More importantly, the electrodes afforded excellent capacity stability under various operation temperatures (ca. −20 to 70 °C), such as an excellent reversible capacity of 1067 mA h g −1 at a current density of 500 mA g −1 after 300 cycles at 60 °C, and remarkable low-temperature performance of a reversible capacity of 208.7 mA h g −1 at a current density of 200 mA g −1 at −20 °C. Therefore, MnO@3MFO@rGO nanocomposites are considered as promising battery materials that can be operated in harsh environments.
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Small
·
2016
·Vol. 12
·期 40
·5564-5571
·
IF 8.315
Ming Zhong,Donghui Yang,Chenchao Xie,Zhang Zhang,Zhen Zhou,Xian-He Bu
Manganese oxides (MnO x ) are promising anode materials for lithium ion batteries, but they generally exhibit mediocre performances due to intrinsic low ionic conductivity, high polarization, and poor stability. Herein, yolk–shell nanorods comprising of nitrogen-doped carbon (N–C) coating on manganese monoxide (MnO) coupled with zinc manganate (ZnMn 2 O 4 ) nanoparticles are manufactured via one-step carbonization of α -MnO 2 /ZIF-8 precursors. When evaluated as anodes for lithium ion batteries, MnO@ZnMn 2 O 4 /N–C exhibits an reversible capacity of 803 mAh g −1 at 50 mA g −1 after 100 cycles, excellent cyclability with a capacity of 595 mAh g −1 at 1000 mAg −1 after 200 cycles, as well as better rate capability compared with those non-N–C shelled manganese oxides (MnO x ). The outstanding electrochemical performance is attributed to the unique yolk–shell nanorod structure, the coating effect of N–C and nanoscale size.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Fan Shi,Yang Liu,Juntong Li,Zhijiao Song,Xue Li,Haiqiang Duan,Yongmei Luo,Qianying Wang,Chengjian Zhuang,Qing Liu,Baoli Wang
Salicylic acid (SA) plays a crucial role in inducing resistance in various plant species against pests, viruses, fungi, and bacterial pathogens. The dynamic changes in SA concentration can serve as real-time indicators of plant immune system activation, offering valuable biological markers for the early detection of diseases and pest infestations. This study develops an electrochemical sensor using MnO-anchored porous carbon (PC-MnO) derived from waste coffee peels for sensitive SA detection. The enhanced sensing mechanism relies on three key aspects: (1) The hierarchical porous carbon framework derived from coffee peels, in conjunction with the chemical activator and pore-forming agent Zn 2+ , facilitates efficient electron transfer and provides a high specific surface area; (2) Uniform MnO nanoparticles provide electrocatalytic sites that lower the oxidation overpotential of SA; (3) Strong interfacial coupling between carbon and MnO facilitates charge transfer kinetics. The optimized sensor shows a detection limit of 16.67 nmol/L and successfully quantifies SA in avocado leaves, revealing significantly elevated levels (96.82 μmol/L) in mite-infested leaves versus healthy controls (0.79 μmol/L). This work presents a sustainable sensing platform that supports early plant stress detection and advances smart agriculture.
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Nanomaterials
·
2020
·Vol. 10
·期 9
·1629
·
IF 4.324
Ranran Jiao,Li Zhao,Shuli Zhou,Yanjun Zhai,Denghu Wei,Suyuan Zeng,Xianxi Zhang
In this study, a simple method was adopted for the synthesis of MnO@C nanocomposites by combining in-situ reduction and carbonization of the Mn3O4precursor. The carbon content, which was controlled by altering the annealing time in the C2H2/Ar atmosphere, was proved to have great influences on the electrochemical performances of the samples. The relationships between the carbon contents and electrochemical performances of the samples were systematically investigated using the cyclic voltammetry (CV) as well as the electrochemical impedance spectroscopy (EIS) method. The results clearly indicated that the carbon content could influence the electrochemical performances of the samples by altering the Li+diffusion rate, electrical conductivity, polarization, and the electrochemical mechanism. When being used as the anode materials in lithium-ion batteries, the capacity retention rate of the resulting MnO@C after 300 cycles could reach 94% (593 mAh g−1, the specific energy of 182 mWh g−1) under a current density of 1.0 A g−1(1.32 C charge/discharge rate). Meanwhile, this method could be easily scaled up, making the rational design and large-scale application of MnO@C possible.Keywords:MnO@C nanocomposites;carbon content;current density;lithium-ion battery;transition metal oxide anode
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高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 41
·21699-21708
·
IF 8.867
Zhe Cui,Qian Liu,Chaoting Xu,Rujia Zou,Jianhua Zhang,Wenlong Zhang,Guoqiang Guan,Junqing Hu,Yangang Sun
Herein, a simple and an environmentally friendly approach is developed to fabricate the novel MnO@C hierarchical structure, derived from Mn-based metal organic frameworks, which is explored as an anode material for lithium ion batteries. Remarkably, the MnO@C microsphere electrode delivers an outstanding, long cycling capacity of 596.3 mA h g−1 at 5C (1C = 765 mA g−1) after 1000 cycles, and an excellent rate performance of 380.1 mA h g−1 at 10C. The overall outstanding properties of the hierarchical MnO@C composite can be attributed to the success of a new strategy for dual structure design, which provides two pathways for effectively alleviating volume changes and enhancing conductivity based on in situ TEM electrochemical experiments and electrochemical impedance spectra. Both the poor conductivity and great volume changes of the MnO electrode material can be effectively improved in two ways: the porous carbon matrix confining the MnO nanoparticles, and the hierarchical nanorod-assembled architecture. The structures herein suggest new design concepts for metal oxide nanoarchitectures for high performance electrode materials in lithium ion batteries.
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Nanoscale
·
2025
·
IF 5.1
Yun Yang,Qing Long,Wei Wang,Junlin Huang,Yufei Zhao,Hao Liu,Hong Gao
Rechargeable zinc-air batteries (ZABs) have emerging as rechargeable zinc-air batteries have emerged as a compelling candidate for advanced electrochemical energy storage and conversion system, owing to their exceptional theoretical energy density, cost-effectiveness, and environmental competibility. Despite these dvantages, their practical utility is restrained by the intrinsically sluggish kinetics of both the oxygen reduction (ORR) and oxygen evolution (OER) reactions. Herein, we present a novel coordination-assisted ball-milling approach to fabricate MnO/Co-N-CNT composites featuring a unique interwoven carbon nanotube architecture. This rationally designedmicrostructure not only facilitates more efficient ion diffusion and electron transport, but also exploits the synergistic interaction between cobalt and manganese species to substantially enhance ORR/ OER activity and long-term stability. As a result, ZABs incorporating these advanced composites achieve an impressive peak power density of 247.6 mW cm-2 and sustain stable cycling for over 115 hours. These findings offer fresh insights into strategic material design and hold significant potential for guiding the future development of high-performance electrochemical energy devices.
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高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Hongguang Zhang,Zi Yu,Yongxin Liang,Tao Gan,Zuqiang Huang,Huayu Hu,Yanjuan Zhang
The utilization of organic molecules as in-situ hydrogen donors for producing γ-valerolactone (GVL) biofuel from biomass-derived levulinic acid (LA) represents one of the promising sustainable approaches. However, this process still faces challenges, including the difficult activation of the hydrogen source and the transport limitations of active hydrogen species. Herein, a Co-MnO/spontaneously polarized ceramic-carbon (Co-MnO/SPCE-C) composite catalyst, featuring a unique spontaneous polarization effect, was developed for catalytic transfer hydrogenation (CTH) of LA to GVL in the isopropanol/H 2 O (volume ratio = 1/19) cosolvent system. Co-MnO/SPCE-C contributed to an outstanding LA conversion of 99.9% and a favorable GVL yield of 93.5%, surpassing the performance achieved by comparative catalysts. Various characterization techniques demonstrate that SPCE with far-infrared emission and surface electric field increased the oxygen vacancies, thereby promoting hydrogen spillover and enhancing the properties of CoO x –MnO acidic sites. The 17 O NMR spectra reveal that SPCE activated water clusters by weakening the hydrogen bonding network. Moreover, D 2 O experiments show that SPCE facilitated the participation of water in the reaction. This work provides valuable insights into the development of an efficient strategy for producing GVL from LA. Before the catalyst can be considered for commercial applications, the focus in the future should be on a comprehensive computational analysis, long-term evaluation of catalyst stability, and additional industrial-scale testing.
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COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Qihao Li,Xin Wang,Cheng Li,Xinwei Yang,Lichao Jia,Jian Li
NiMn 2 O 4 (NMO) coated Gd-doped CeO 2 (GDC) and NiO powders are prepared by a hydrothermal method for the anode of a metal (Ni-10 at.% Fe)-supported solid oxide fuel cell fueled by wet CH 4 (3 vol.% H 2 O). NMO remains on NiO but dissolves into GDC at 1400 °C. Upon reduction in H 2 at 700 °C for 2 h, Ni nanoparticles exsolve on the doped-CeO 2 (DCO) substrate (DCO@Ni), while MnO nanoparticles form on Ni (Ni@MnO). DCO@Ni demonstrates high catalytic activity for reforming wet CH 4 and high resistance to carbon deposition with a yield of H 2 increasing from 11 (500 °C) to 33 (700 °C) ml min −1 and remaining around 25 ml min −1 at 600 °C for 30 h. The metal-supported single-cell with a Ni@MnO-DCO@Ni anode shows high initial and durable electrochemical performance with a maximum power density increasing from 160 (500 °C) to 720 (700 °C) mW cm −2 and a cell voltage remaining above 0.55 V at 600 °C for 200 h under 400 mA cm −2 and 20 ml min −1 . Such high performance is ascribed to the metal support with low ohmic resistance and the engineered anode with high catalytic activity and enhanced resistance to carbon deposition.
研究领域:
能源材料
·
电化学
·
燃料电池技术
·
纳米材料
·
催化
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Lili Xiao,Lin Jia,Shengzhi Zhao,Xiaoying Tang,Chengjie Zhu,Huan Huang,Jin Jiang,Mingtian Li
A kind of one-step, solvent-free, environment-friendly method is always highly appreciated in synthesis of electrocatalyst . In this work, MnO nanoparticles were coated by sheet-like carbon (MnO/C) for building a three-dimensional electrocatalyst with interconnected mesopores . Moreover, the unique porous structure of MnO/C can be facilely achieved through a one-step solvent-free calcination . In the calcination, 2-methylimidazole (2-MeIm) decomposed into carbon framework at the catalysis of MnO. The interconnected pores consisted of sheet-like carbon can significantly reduce mass transfer resistances and prevent the aggregation of MnO. Therefore MnO/C modified glassy carbon electrode (GCE) exhibited high activities in simultaneous detection of dopamine (DA) and uric acid (UA), with the sensitivities of 9.92 μA μM − 1 for DA, 8.42 μA μM − 1 for UA. The limits of detection were calculated as 0.009 μM and 0.03 μM for DA and UA, respectively. Moreover, MnO/C has promising application in detection of human urine and serum due to the satisfactory recoveries.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Huiting Xu,Huibin Liu,Wenyue Yang,Meng Li,Fan Zhao,Chunli Li,Junjie Qi,Honghai Wang,Wenchao Peng,Xiaobin Fan,Jiapeng Liu
Rechargeable aqueous zinc batteries (AZBs) are increasingly recognized as an alternative to conventional energy storage systems due to their environmentally safe nature, abundant zinc resources, and high theoretical capacity. However, the intercalation or surface redox mechanisms limit the development of AZBs cathode materials due to low specific capacity and energy density. The tellurium-based (Te) materials with conversion mechanisms are promising cathode materials for AZBs. Nevertheless, the slow kinetics are detrimental to the increase in specific capacity and energy density for Zn-Te battery. Therefore, a hierarchical structure of manganese oxide (MnO) hollow nanospheres loaded on nitrogen-doped carbon nanosheets (MnO@NC) was rationally designed and used as Te hosts (Te/MnO@NC) for Zn-Te battery. This hierarchical structure facilitates the loading of more Te species. Meanwhile, the MnO hollow nanospheres can expose more active sites, which can promote the kinetics of Te redox reactions thereby lowering the reaction energy barrier. The Te/MnO@NC cathode exhibits high specific capacity and high energy density (429 mAh g −1 and 407 Wh Kg −1 at 0.1 A g −1 ). Additionally, the conversion mechanism was investigated by systematic characterization and density functional theory (DFT) calculations. This study presents a new design platform for developing AZBs with high specific capacity and energy density.
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Energy & Environmental Science
·
2019
·Vol. 12
·期 3
·1046-1054
·
IF 33.25
Siwu Li,Yuan Liu,Junwen Zhou,Shanshan Hong,Yu Dong,Jiaming Wang,Xing Gao,Pengfei Qi,Yuzhen Han,Bo Wang
Li–CO2 batteries have been developed in recent years, aiming to utilize CO2, a major cause of the greenhouse effect, as an effective energy storage medium. However, current Li–CO2 batteries still suffer from low energy efficiency, poor rate capability and short cycle life, demanding the design of more efficient CO2 cathodes. Herein, we synthesized ultrafine MnO nanoparticles dispersed in a graphene-interconnected N-doped 3D carbon framework, MnO@NC-G, by pyrolyzing a composite of a GO-wrapped metal–organic framework (MOF) containing Mn(II) active sites as the cathode material for Li–CO2 batteries. This material can enable low voltage hysteresis (0.88 V at 50 mA g−1), high rate capability (up to 1 A g−1) and long cycle life (more than 200 cycles) in cells. By comparing MnO@NC-G with four other Mn(II)-based cathodes, MnO@NC, parent Mn-MOF, MnO@KB and bulk MnO, we propose three key aspects for designing CO2 cathodes: (1) dispersed catalytic species, (2) fast electron transport, and (3) a robust interconnected network. We also found that the performance of a cycled MnO@NC-G cathode can be replenished simply by replacing the anode, indicating that the cell cycle life can be further extended with effective anode protection. Our findings here provide useful guidelines for improving the performance of Li–CO2 batteries, thus shedding light on the development of practical Li battery systems based on gaseous cathodes.
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ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Hongbo Liang,Mengfan Pei,Shuo Zhuo,Rui Xie,Hui Lin,Wenkai Song,Zirui Guo,Xigao Jian,Fangyuan Hu
The high activation barriers for sodium polysulfide conversion during the charge–discharge processes of room-temperature sodium–sulfur batteries lead to sluggish reaction kinetics, thereby resulting in limited practical specific capacities. This simultaneously triggers the shuttle effect, leading to a rapid decay in specific capacity. In this study, we propose a hierarchical (crystalline-atomic) catalytic strategy, where the hierarchical catalyst features both manganese oxide crystalline sites and Mn single-atom sites. The two catalytic sites selectively anchor the sulfur and metal moieties of sodium polysulfides, respectively, exerting a “tearing” effect that weakens the chemical bonds and lowers the activation energy, thereby accelerating the polysulfide conversion. The cathode material synthesized using this method retains a specific capacity of 309 mAh g −1 after 2000 cycles at a current density of 2C, indicating that hierarchical parallel catalysis can effectively mitigate the shuttle effect and accelerate the reaction kinetics. Therefore, this work demonstrates the practical potential of hierarchical parallel catalysis in metal-sulfur batteries and provides a new approach for catalyst design in this domain.
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