JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Fangfang Ren,Xuanrong Chen,Rong Xing,Yukou Du
Anode catalyst is one of the core components of fuel cell, but its poor catalytic activity, short lifespan, and high price are tricky problems to the commercialization of fuel cell. Herein, a novel rod-like MnO 2 decorated reduced graphene oxide (RGO) supported Pd hybrid (Pd/RGO-MnO 2 ) has been designed, which manifests more negative onset oxidation potential, higher peak current density, and better long-term stability relative to Pd/RGO and pure Pd catalysts when serving for ethylene glycol electrooxidation . This enhancement may be due to the addition of MnO 2 , which can effectively promote the adsorption of hydroxyl at a lower potential and produce a strong electronic interaction with Pd, as confirmed by X-ray photoelectron spectroscopy (XPS) technique. In view of its excellent performance and low cost, Pd/RGO-MnO 2 is considered to be a potential and effective anode catalyst for DEGFCs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Jianghua Wu,Waseem Raza,Peng Wang,Arshad Hussain,Yangbin Ding,Jian Yu,Yanyan Wu,Jie Zhao
A one-pot and energy-saving method was developed to manufacture defective manganese oxide materials. The insertion of zinc ions improves manganese oxide conductivity results in a significant increase in number of defects in the lattice to provide abundant active sites for energy storage. The synthesized zinc doped manganese oxide achieved a maximum capacity of 392 F g −1 in the three-electrode system, the corresponding supercapacitor reached an outstanding energy density of 55.28 Wh kg −1 at a power density of 555.6 W kg −1 , while maintaining 95.2% of the initial capacity after 10,000 cycles. This research sheds new insights to the preparation of defective materials by a simple one-step method for energy storage applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Xian Sun,Jiuwu Wang,Chenguang Huang,Yinping Wu,Jinxing Hou,Yue Situ,Hong Huang
The improvement of electrochemical properties of MnO 2 has been an attractive topic for a long time. Here, MnO 2 /polyacrylonitrile carbon (MnO 2 /PANC) nanostructures with well-modified morphology are required by chemical direct synthesis. The cycling stability and specific capacitance performance of MnO 2 /PANC electrode are enhanced during electrochemical cycling and explored to be closely related to the internal morphologies and crystal form of the various MnO 2 /PANC nanostructures. The Na + ion and PANC are forced to interact with increased active sites of the MnO 2 /PANC surface by cycling protocol. The resulting electrode exhibits the defective nanostructure , in which the Mn O C bond is introduced and comprehensive Mn valence occurred in the untrathin MnO 2 /PANC nanostructure; such unique core-shell nanostructure, providing more structural defects, increased surface area and rich functional groups, and subsequently, enhanced electrochemical capacitance performance. Therefore, this work suggests a new concept for the development of manganese-based electrode materials with enhanced performance and may have broad application in high-energy storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Tao Lin,Jiacheng Lin,Xiaoyao Wei,Lulu Lu,Xuefeng Yin
Among the electrode materials of supercapacitors , transition metal oxides have been widely used because of their low price, high theoretical capacitance and good cycle stability, and MnO 2 is one of the typical representative materials. However, the actual specific capacitance of MnO 2 is low because of its poor conductivity, easy agglomeration in the preparation process and large volume change in the process of repeated charge and discharge. Attapulgite can not only provide a large specific surface area for transition metal oxide materials, but also provide a skeleton on which nano-sized materials can be grown or dispersed. Therefore, the electrochemical performance of electrode materials can be improved by designing nanostructures and compounding a variety of materials with different properties. Herein, a new type of composites electrode material is prepared by simple one-step hydrothermal method . As an electrode material, the ATP-MnO 2 composites exhibited a high specific capacitance of 138.2 F/g at a current density of 0.5 A/g, which was 13.4% higher than that of pure MnO 2 nanoflowers . Under the current density of 3 A/g, the capacitance retention of ATP-MnO 2 composites was 89.4% after 5000 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 29
·期 11
·1954-1962
·
IF 3.85
Zhao Yue,Wang Bei,Shi Minjie,An Shibo,Zhao Liping,Yan Chao
Rechargeable aqueous magnesium-ion batteries (MIBs) show great promise for low-cost, high-safety, and high-performance energy storage applications. Although manganese dioxide (MnO 2 ) is considered as a potential electrode material for aqueous MIBs, the low electrical conductivity and unsatisfactory cycling performance greatly hinder the practical application of MnO 2 electrode. To overcome these problems, herein, a novel Mg-intercalation engineering approach for MnO 2 electrode to be used in aqueous MIBs is presented, wherein the structural regulation and electrochemical performance of the Mg-intercalation MnO 2 (denoted as MMO) electrode were thoroughly investigated by density functional theory (DFT) calculations and in-situ Raman investigation. The results demonstrate that the Mg intercalation is essential to adjusting the charge/ion state and electronic band gap of MMO electrode, as well as the highly reversible phase transition of the MMO electrode during the charging-discharging process. Because of these remarkable characteristics, the MMO electrode can be capable of delivering a significant specific capacity of ∼419.8 mAh·g −1 , while exhibiting a good cycling capability over 1000 cycles in 1 M aqueous MgCl 2 electrolyte. On the basis of such MMO electrode, we have successfully developed a soft-packaging aqueous MIB with excellent electrochemical properties, revealing its huge application potential as the efficient energy storage devices.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Xiangtao Yu,Xiaoming Zhu,Ziyuan Pei,Yongpeng Li,Chenwei Li,Zhuyin Sui
Lithium‑sulfur batteries have been considered as a promising chemical power source owing to the low costs, high energy densities , and nontoxicity. However, sulfur-based cathodes have several shortcomings, including poor electrochemical activity and fast capacity attenuation. In this work, manganese dioxide (MnO 2 ) and nitrogen-doped porous graphene (pNGA) were introduced to the sulfur cathode to improve its electrochemical activity and prevent the rapid decay of capacity. The pNGA/MnO 2 composite with a three-dimensional architecture was fabricated by steam etching of nitrogen-doped graphene aerogel and chemical deposition of MnO 2 nanoparticles . In this structure, the nitrogen-doped porous graphene acts as a skeleton to form a conductive network. The MnO 2 particles anchored on graphene sheets have a good interaction with polysulfides . The as-prepared pNGA/MnO 2 @S cathode shows an excellent comprehensive electrochemical performance . The calculated specific capacities are 1144, 1007, 920, 852, and 762 mA h g −1 at 0.1C, 0.2C, 0.5C, 1C, and 2C respectively. In addition, the pNGA/MnO 2 @S cathode displays a good cycling performance: the specific capacity maintains at 887 mA h g −1 at 0.5C over 100 cycles.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Baobao Bai,Ying Huang,Jiajia Chen,Juan Lei,Shuang Wang,Jiancheng Wang
Catalytic oxidation proves the most promising technology for volatile organic compounds (VOCs) abatement. Lattice disorder plays a crucial role in the catalytic activity of catalysts due to the exposure of more active sites. Inspired by this, we successfully prepared a series of ε-MnO 2 with different lattice disorder defects via several simple methods and applied them to the catalytic oxidation of two typical VOCs (toluene and acetone). Various characterizations and performance tests confirm that the ultrathin (1.4–1.8 nm) structure and strong lattice disorder can enhance the low temperature reduction and reactive oxygen species, so that MnO 2 -R exhibits excellent toluene and acetone oxidation activities. In-situ DRIFTS tests were carried out to detect reaction intermediates in the toluene and acetone oxidation process on the catalyst surface. Moreover, we propose a possible synergistic mechanism for toluene and acetone mixtures catalytic oxidation. This work reveals the important role of lattice disorder defects in the catalytic oxidation of VOCs on Mn-based catalysts, and deepens the insights of the reaction path in toluene and acetone catalytic oxidation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jinhe Wei,Fei Hu,Xiong Shen,Bingkun Chen,Lin Chen,Zhongming Wang,Chenglong Lv,Qiuyun Ouyang
The roles of oxygen vacancies to enhance the electrochemical performance were not clearly explained in comprehensive research. Herein, the vertically oriented NiCo 2 S 4 /MnO 2 core–shell nanocomposites are in situ grown on the nickel foam (NF) surface and activated by oxygen vacancy engineering via a chemical reduction method. The scanning electron microscope (SEM) and transmission electron microscope (TEM) results show the shell-MnO 2 is well coated on the core-NiCo 2 S 4 . The hierarchical core–shell nanostructures synergistically increase conductivity and provide rich faradaic redox chemical reactions . Moreover, the density functional theory (DFT) calculations further indicate that the electronic properties and structure properties in NiCo 2 S 4 /MnO 2 electrode of reduction for 60 min (NiCo 2 S 4 /MnO 2 -60) are effectively adjusted by introducing oxygen vacancies. Impressively, the NiCo 2 S 4 /MnO 2 -60 electrode delivers substantially appreciable areal capacity of 2.13 mAh·cm −2 couple with superior rate capability. The as-prepared high-performance electrode material can assemble into solid-state hybrid supercapacitor . The fabricated NiCo 2 S 4 /MnO 2 -60//AC device exhibits an exceptional energy density of 43.16 Wh·kg −1 at a power density of 384.21 W·kg −1 and satisfactory cyclic stability of 92.1 % at current density of 10 mA·cm −2 after 10,000 cycles. In general, the work demonstrates the significance of NiCo 2 S 4 /MnO 2 -60 as a highly redox active electrode material for future practical application in supercapacitors .
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 6
·3991-3999
·
IF 2.1
Du Xiangxiang,Liu Shujun,Xu Qin,Shi Xuejun
MnO 2 nanowires/polyaniline composite (MnO 2 NW/PANI) was prepared by combining one-dimensional MnO 2 nanowires (MnO 2 NW) with conductive polymer PANI surface coating. The MnO 2 NW were synthesized via a one-pot facile hydrothermal method. The composite MnO 2 NW/PANI was then prepared by in situ polymerization of aniline monomer on the surface of MnO 2 NW. The MnO 2 NW/PANI was able to serve as electroactive material and demonstrated a specific capacitance of 306.7 F/g recorded at a current density is 0.5 A/g, which is 28.4% higher than that of pristine MnO 2 (only 238.9 F/g). The reduced electric resistance within MnO 2 NW/PANI interconnection networks and the good synergistic effect between MnO 2 NW and PANI for fast ion/charge transfer supports the enhanced capacitance of the composite. In addition, the MnO 2 NW/PANI composite electrode shows stable cycle performance, with capacity retention of 88.7% after 5000 repeated cycles test at a high current density of 5 A/g. The constructed nanocomposites have great potential in the further development of high-performance electrochemical electrode materials for energy storage application.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2019
·
IF 3.973
Meilin Shi,Shan Wang,Shaohui Zheng,Pingfu Hou,Lina Dong,Meijuan He,Chen Wu,Xiuli Zhang,Fengmei Zuo,Kai Xu,Jingjing Li
Multifunctional nanocarriers, which can be used for molecular imaging and drug delivery simultaneously, favor the fabrication of theranostic platforms in a less cost- and time-consuming way. Polyethylene glycol (PEG)-modified manganese dioxide (MnO 2 ) nanosheets (PEG-MnO 2 ), used as two-dimensional nanomaterials, not only possess the high surface-to-volume ratio necessary for drug delivery but also display a redoxable property in the tumor microenvironment, producing Mn 2+ ions for magnetic resonance imaging (MRI). In this study, we constructed a PEG-MnO 2 -OPN siRNA nanocomplex via a modular streptavidin bridge for the theranostic treatment of renal carcinoma in vitro and in vivo . This strategy of utilizing PEG-MnO 2 nanosheets for OPN siRNA delivery showed effective tumor growth inhibition of 786-O tumor-bearing mice, and such a process could be monitored by the activated T 1 -weight MRI, illustrating the promising potential of PEG-MnO 2 nanosheets for the fabrication of an MRI-based theranostic system.
研究领域:
生物医学工程
·
药学
·
癌症研究
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2019
·
IF 15.548
Weizhao Li,Xihong Zu,Yanxian Zeng,Leyuan Zhang,Zilun Tang,Guobin Yi,Zihan Chen,Wenjing Lin,Xiaofeng Lin,Huankai Zhou,Jing Xiao,Yulin Deng
Flexible solid-state supercapacitor (FSSC) is one of the most promising energy devices for wearable and portable electronics due to the advantages of high energy/power density, outstanding flexibility, good mutual compatibility and good safety. However, the serious performance decay of FSSCs caused by the structure and shape deformation of the devices is still a remaining challenge. Here, we report a high-performance FSSC with well-designed 3D Co 3 O 4 nanowires @ MnO 2 -PPy hybrid nanoflake electrode made by a facile and effective one-step electro-codeposition method. To form a 3D skeleton, Co 3 O 4 nanowires are vertically grown on carbon fibers, which improves the surface area and mass loading of pseudocapacitive materials. More importantly, it is also beneficial to avoid structure collapse during the bending, folding or twisting. Furthermore, MnO 2 -PPy nanoflakes grown on Co 3 O 4 nanowires are capable to achieve the ultra-high surface area, fast electron/ion transport pathways and high utilization efficiency of the active materials. The specific capacitance of the constructed FSSC is as high as 215 F g −1 at the current density of 0.5 A g −1 . The high energy density (41.3 Wh kg −1 ) and power density (4348 W kg −1 ) with a high capacitance retention of 93.0% after 1000 bending and twisting cycles are also achieved, indicating that it has a great potential for practical application in wearable and portable electronics.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 37
·16475-16480
·
IF 2.7
Xiaoxu Zhang,Xiangyu Cai,Yanqun Fei,Yuying Jia,Hongyan Shan,Yanfu Huan
In this article, a CRET-based chemiluminescent sensor was developed for ascorbic acid detection. Au/Pt@Cu2O/CuO NPs with peroxidase activity were prepared to catalyse the decomposition of H2O2 to produce free radicals, which led to the enhancement of the chemiluminescence (CL) signal, and the CRET between luminol and MnO2 NSs was able to take place and the CL signal was reduced; the presence of ascorbic acid would reduce MnO2 NSs, which was able to weaken the energy transfer between luminol and MnO2 NSs and restored the CL signal. Under the optimal experimental conditions, the detection range of ascorbic acid was 1–1000 μM, and the LOD was 0.35 μM. The method is sensitive and has a wide linear range, and is expected to be applied to the detection of ascorbic acid in more complex environments.
研究领域:
分析化学
·
生物传感
·
纳米技术
✓ 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）