RSC Advances
·
2017
·Vol. 7
·期 14
·8264-8271
·
IF 3.108
Zhan Jiang,Kaihua Huang,Dian Yang,Shuai Wang,Hong Zhong,Chongwen Jiang
Mn3O4 hollow microspheres have been facilely prepared via a green synthesis of 2,3,5,6-tetrachloropyridine reduced from pentachloropyridine by manganese. The specific hollow microspheres were made by a H2 gas bubble-templating method presenting a high specific surface area (87.1 m2 g−1) and a big total pore volume (0.2030 cm3 g−1). The Mn3O4 hollow microspheres as an anode material demonstrate a good electrochemical performance, with a high reversible capacity of 646.9 mA h g−1 after 240 cycles at a current density of 200 mA g−1. The good cycling performance is attributed to numerous mesopores, high specific surface area and big total pore volume, which can offer good electrical contact and conductivity as well as accommodate the mechanism strains. In addition, the yield and selectivity of 2,3,5,6-tetrachloropyridine achieved up to 99.2% and 99.5%, respectively.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Nano Research
·
2019
·Vol. 12
·期 5
·1093-1098
·
IF 8.515
Huang Hong,Gong Feng,Wang Yuan,Wang Huanbo,Wu Xiufeng,Lu Wenbo,Zhao Runbo,Chen Hongyu,Shi Xifeng,Asiri Abdullah M.,Li Tingshuai,Liu Qian,Sun Xuping
Currently, industrial-scale NH 3 production almost relies on energy-intensive Haber-Bosch process from atmospheric N 2 with large amount of CO 2 emission, while low-cost and high-efficient catalysts are demanded for the N 2 reduction reaction (NRR). In this study, Mn 3 O 4 nanoparticles@reduced graphene oxide (Mn 3 O 4 @rGO) composite is reported as an efficient NRR electrocatalyst with excellent selectivity for NH 3 formation. In 0.1 M Na 2 SO 4 solution, such catalyst obtains a NH 3 yield of 17.4 μg·h −1 ·mg −1 cat . and a Faradaic efficiency of 3.52% at −0.85 V vs. reversible hydrogen electrode. Notably, it also shows high electrochemical stability during electrolysis process. Density functional theory (DFT) calculations also demonstrate that the (112) planes of Mn 3 O 4 possess superior NRR activity.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Zhi Liu,Minmin Wang,Shoujie Liu,Zheng Chen,Lingzhi Yang,Kaian Sun,Yanju Chen,Lingyou Zeng,Wenhong Wang,Jinchong Zhao,Guangxun Sun,Bin Liu,Yuan Pan,Yunqi Liu,Chenguang Liu
The biggest challenge for selective catalytic reduction (SCR) of NO by NH 3 at low temperatures is to develop robust catalysts with high resistance to SO 2 . Mn-based catalysts have attracted great attention for their excellent activity, but the poor SO 2 resistance limits their application. Herein, we report a novel assembled composite featuring Mn 3 O 4 nanoparticles embedded in defect-abundant graphitic carbon frame (Mn 3 O 4 @G-A) via a confinement–pyrolysis–oxidation strategy derived from MOF. The Mn 3 O 4 @G-A exhibits excellent activity (reaching over 90 % NO conversion in 100, 000 h −1 GHSV at 160 °C) and significantly improved SO 2 resistance in comparison to pristine Mn 3 O 4 , and all the performance tests were conducted with 5.6 vol.% water vapor. By combining synchrotron radiation-based X-ray absorption spectroscopy and density functional theory calculation, we further discovered the positive role and the origin of graphitic carbon for improving SO 2 resistance. Over the Mn 3 O 4 @G-A sample, the electrons can be transferred from graphitic carbon to Mn 3 O 4 nanoparticles, which can regulate the electronic properties and oxidizing ability of Mn 3 O 4 nanoparticles. The proper oxidizing ability of Mn 3 O 4 @G-A can inhibit the oxidation of SO 2 to SO 3 , thus further avoid the formation of NH 4 HSO 4 and improve the SO 2 resistance. Our work here not only solves the current problem of poor SO 2 resistance of Mn-based catalysts, but also provides new insights into the design and synthesis of MOF-derived graphitic carbon-containing catalysts for SCR applications.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Gongyu Wen,Yulei Sui,Xiaoping Zhang,Jiangpeng Li,Ziwei Zhang,Shengkui Zhong,Shibao Tang,Ling Wu
Lithium-sulfur batteries have attracted numerous attentions owing to their high theory discharge specific capacity and energy density . However, sulfur cathode usually suffers from poor cycle stability and slow reaction kinetics, caused by its poor conductivity, excessive volume changes during charge/discharge processes, complex sulfur species conversion reaction and the dissolution of polysulfide intermediates. Here, we present a free-standing framework of Mn 3 O 4 nanoparticles combine with polypyrrole (PPy) nanotubes as host materials for lithium-sulfur batteries to overcome these issues. In this construction, PPy nanotubes serve as the excellent container of sulfur and physical barrier for the excessive volume expansion of sulfur during electrochemical reaction processes, and the nanotubes also provide an efficient conductive network for the rapid transmission of electrons and ions, while Mn 3 O 4 nanoparticles facilitate trapping lithium polysulfides. The coordination of PPy nanotubes and Mn 3 O 4 effectively alleviate the shuttle effect as well as enhance the utilization of sulfur. The obtained PPy@Mn 3 O 4 -S sample shows high capacities of 1419.9 and 925.5 mAh g −1 at 0.1 C and 1 C rate, respectively, and exhibits a low capacity fading rate of 0.062% per cycle for 800 cycles at 1 C rate. This work provides a new and effective way for the design of lithium-sulfur batteries with both high rate performance and long cycle stability.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 1
·164-172
·
IF 2.302
Yuan Ziliang,Chen Shaohua,Liu Bing
Nitrogen-doped reduced graphene oxide-supported Mn 3 O 4 nanoparticles (N-RGO/Mn 3 O 4 ) were prepared by solvothermal method and characterized by several physical techniques such as TEM images, XRD, XPS, and N 2 adsorption–desorption techniques. The as-made N-RGO/Mn 3 O 4 catalyst was used for the oxidation of vanillyl alcohol to vanillin. Several important reaction parameters were investigated such as reaction solvent, oxygen concentration, reaction temperature, and catalyst loading. N,N -Dimethylformamide was found to be the best solvent, affording both high conversion and vanillin selectivity. 92.5 % conversion of vanillyl alcohol and 91.4 % selectivity of vanillin were achieved after 12 h at 120 °C under oxygen balloon by the use of 40 mg of the N-GO/Mn 3 O 4 catalyst. Kinetic studies revealed that the active energy for the oxidation of vanillyl alcohol to vanillin over N-GO/Mn 3 O 4 catalyst was 39.67 kJ.mol −1 . More importantly, the catalyst was stable and could be reused for 6 times without the significant loss of its catalytic activity.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jiangshan Gao,Huanhuan Wang,Yang Zhou,Zhiming Liu,Yan He
The combination of magnetic nanoparticles and transition metal oxides has attracted much attention in microwave absorption applications. Herein, the MnO 2 /Mn 3 O 4 @Ni-Co/graphite carbon (GC) nanocubes with porous structure and ultrathin nanosheets was constructed by self-template strategy and in-situ synthesis. The composites not only synergize the magnetic loss of magnetic Ni-Co nanoparticles with the dielectric losses of GC and MnO 2 /Mn 3 O 4 , but also enhance the multiple interface polarization and improve impedance matching. As a result, the MnO 2 /Mn 3 O 4 @Ni-Co/GC nanocubes present outstanding electromagnetic wave (EMW) absorption performances, in which a RL min of −26 dB at 6.4 GHz with a thickness of 4 mm and an effective absorption bandwidth covering from 5.3 GHz to 6.4 GHz are achieved. Meanwhile, the widest effective absorption bandwidth with the value of 3.7 GHz can be achieved at a matching thickness of 2.0 mm. More importantly, this work provides a new strategy for the synthesis of EMW absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yangyang Chen,Chan Xue,Feifei Ni,Binwu Hu,Miaoheng Yan,He Zhang,Yuxiang Hu,Xiaoyao Peng,Guangfang Li,Yu Han,Hongjian Liu,Zengwu Shao,Qin Wang,Yulong Wei
Annulus fibrosus (AF) injury plays a critical role in intervertebral disc degeneration (IVDD), with oxidative stress and extracellular matrix (ECM) imbalance being major pathogenic factors. However, effective repair methods are limited. In this study, an injectable photothermal hydrogel, Mn 3 O 4 @ChS-HA, composed of dopamine-grafted oxidized chondroitin sulfate (dop-OChS), adipic dihydrazide-modified hyaluronic acid (ADH-HA), and Mn 3 O 4 nanoparticles is constructed to repair AF damage. The Mn 3 O 4 @ChS-HA mimics the native intervertebral disc environment, offering excellent mechanical properties and strong adhesion to the AF defect site, while enabling long-term retention of Mn 3 O 4 nanoparticles. Mn 3 O 4 nanoparticles exhibit catalytic properties similar to those of superoxide dismutase, catalase, and glutathione peroxidase, efficiently scavenging reactive oxygen species and modulating ECM metabolism. In vitro and in vivo studies demonstrate that Mn 3 O 4 @ChS-HA significantly inhibits apoptosis, delays cell senescence, reduces inflammation, and promotes autophagy, facilitating AF repair. The hydrogel also restores disc height and maintained ECM integrity in a rat model of AF injury. Mild photothermal therapy (MPTT) further enhances these effects, supporting tissue regeneration and delaying the progression of IVDD. The MPTT-nanozyme-hydrogel system, Mn 3 O 4 @ChS-HA, exhibits various biological functions by regulating redox homeostasis and promoting tissue repair, highlighting the potential of this approach as a promising strategy for IVDD treatment.
研究领域:
生物医学工程
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材料科学
·
骨科
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chao Wu,Shuang Cao,Heng Li,Zhi Li,Gairong Chen,Xiaowei Guo,Baobao Chang,Yansong Bai,Xianyou Wang
Herein, we put forward a feasible interfacial modification strategy in virtue of Mn 3 O 4 surface coating to construct protective shell and alleviate Jahn-Teller distortion during the charge/discharge process. It has been found that the increase of the oxygen vacancy on the surface of Li 1.2 Ni 0.27 Mn 0.54 O 2 of (LRNMO) after Mn 3 O 4 protective layer modification can effectively restrain the release of oxygen and enhancing rate capability, and thus improving its comprehensive electrochemical performances. In particular, the initial coulombic efficiency of the optimized LRNMO-1 electrode is improved from 72.3% to 84.3%. The capacity retention rate is up to 95.6% at 250 mA g −1 (1C) after 200 cycles. In addition, the LRNMO-1 electrode also has a good capacity retention rate (96.4% after 100 cycles) at a high current density of 5C. Moreover, the designed LRNMO@Mn 3 O 4 cathode exhibits higher ionic conductivity and better interface stability. As a result, this work offers a practicable and valuable exploration for the development and industrialization of Co-free Li-rich Mn-based cathode materials with high energy density .
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yigui Tang,Zongsu Wei,Chi Wang,Ping Ning,Minghui He,Shuangyou Bao,Xin Sun,Kai Li
Landfill disposal of manganese slag is a significant environmental concern on both local and global levels. Using manganese slag to synthesis catalysts to degrade organic pollutants in wastewater is a promising pathway for the solid waste treatment. Here, we propose a simple method to prepare magnetic catalysts containing Mn 3 O 4 -Fe 3 O 4 (MMF) using manganese slag as raw materials. The MMF exhibits excellent degradation performance for enrofloxacin (ENR) with 97 % removal efficiency within 30 min and can be rapidly isolated from wastewater by magnet. Electron paramagnetic resonance (EPR) and quenching experiments demonstrated that 1 O 2 produced by the non-radical pathway is the principal active substance for ENR degradation. X-ray photoelectron spectroscopy (XPS) and density-functional theory (DFT) calculations indicate that Mn and Fe in MMF provide electrons for PMS activation and that the presence of Fe promotes the activation of the PMS and the cycling of Mn. This work paves the way for developing magnetic catalysts from manganese slag for the treatment of organic pollutants via advanced oxidation process.
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
INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Junchao Qian,Yaping Wang,Zhigang Chen,Chengbao Liu,Yuyang Zhou,Yue Yang,Yenan Song,Biao Kong
Mn 3 O 4 -CeO 2 /holey-graphene nano-composite was fabricated by hydrothermal reaction on the honeycomb-like porous graphene structure. The hybrid materials displayed enhanced capacitive performance (310 F·g −1 at 2 A·g −1 ). After 1000 cycles, the initial capacitance of the composite still has 92.4% retained. The improved electrochemical performance might be ascribed to the intimate combination of the pesudocapacitance from nanoparticles well-dispersed on graphene sheets and double layer capacitance from excellent conductive graphene scaffold. The investigation presents a promising application of nanoparticles/graphene composites as electrode materials for energy storage.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2018
·Vol. 6
·期 2
·355-365
·
IF 5.106
Hao Zhang,Dun Liu,Yuquan Wei,Aiyang Li,Bo Liu,Ying Yuan,Haichuan Zhang,Guanghe Li,Fang Zhang
One-dimensional manganese oxide presents distinctly stable properties and exhibits excellent electrochemical performance in neutral aqueous solution as a supercapacitor. Here, we successfully prepare a variety of Mn3O4 nano-rods with different micro-morphologies and nano-structures and show that 107.5 nm Mn3O4 long-rod electrodes exhibit a high specific capacitance of 136.5 F g−1 at a current density of 0.1 A g−1. An aqueous asymmetric supercapacitor device with a maximum work voltage of 1.8 V and high power density is fabricated by using Mn3O4 long-rods as the positive electrode and reduced graphene oxide as the negative electrode. Moreover, this asymmetric capacitor device displays a remarkable electro-adsorption performance, with a mean rate of 0.90 mg g−1 min−1 of Na2SO4 solution and an initial concentration of 500 mg L−1, for capacitive deionization. Furthermore, during the desorption processes, waste energy can power one red LED indicator efficiently for at least 5 min, realizing effective energy re-utilization.
研究领域:
材料科学
·
电化学
·
能源存储与转换
·
环境工程
·
纳米技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jixiang Xu,Yi Wang,Jun Wan,Lei Wang
In this work, carbon-doped CoMn 2 O 4 /Mn 3 O 4 (C-CoMnO) composite catalyst were prepared via calcining solvothermal product of Mn 2+ , Co 2+ , and 2-methylimidazole in air. The catalytic performance of activating peroxymonosulfate (PMS) for ciprofloxacin (CIP) degradation was discussed. The results showed that the 0.1 g L −1 C-2CoMnO could effectively activate PMS, resulting in 96.18% CIP was degraded within 60 min. The corresponding total organic carbon removal ratio and apparent rate constant were 81.33% and 0.043 min −1 , respectively. The influencing factors, such as Co/Mn molar ratios, calcination temperature, PMS concentration, solution pH, and coexisting ions were explored. The optimal catalytic system exhibited good recycling performance, wide pH adaptation and high resistance to salt interference. SO 4 ⋅ − , ⋅OH, and ⋅O 2 − -based radicals, as well as 1 O 2 and surface complexes-based nonradicals were participated in CIP degradation. The CIP degradation pathways were proposed. Density functional theory calculations (DFT) indicated that PMS was more easily activated via Co/Mn synergism. The doped carbon was also contributed to PMS activation via facilitating electron transfer. This study may shed light toward the synergistic effect of metal oxides in PMS activation.
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
危险品化学品经营许可证（带存储）