Exploring efficient manganese oxides catalyst for ozone decomposition and its deactivation induced by water vapor

2021 ◽  
Author(s):  
Jian Chen ◽  
Chentao Fang ◽  
Dandan Li ◽  
Xufang Wang ◽  
Yuejuan Wang ◽  
...  
Keyword(s):  
Water Vapor ◽  
Manganese Oxides ◽  
Nitrogen Atmosphere ◽  
Manganese Acetate ◽  
Carbon Sphere ◽  
Ozone Decomposition ◽  
Carbon Spheres

A series of MnOx catalysts supported by carbon sphere were prepared by calcining mixtures of manganese acetate and carbon spheres under nitrogen atmosphere, and their performances for ozone decomposition under...

scholarly journals Unexpected Link between the Template Purification Solvent and the Structure of Titanium Dioxide Hollow Spheres

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 112
Author(s):  
Tamás Gyulavári ◽  
Kata Kovács ◽  
Klára Magyari ◽  
Kornélia Baán ◽  
Anna Szabó ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Phase Composition ◽  
Anatase Phase ◽  
Hollow Spheres ◽  
Rutile Phase ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
Carbonate Species ◽  
Determining Factor

Carbon spheres were applied as templates to synthesize titanium dioxide hollow spheres. The templates were purified with either ethanol or acetone, and the effects of this treatment on the properties of the resulting titania were investigated. The photocatalytic activity of the catalysts was measured via the decomposition of phenol model pollutant under visible light irradiation. It was found that the solvent used for the purification of the carbon spheres had a surprisingly large impact on the crystal phase composition, morphology, and photocatalytic activity. Using ethanol resulted in a predominantly rutile phase titanium dioxide with regular morphology and higher photocatalytic activity (r0,phenol = 3.9 × 10−9 M∙s−1) than that containing mainly anatase phase prepared using acetone (r0,phenol = 1.2 × 10−9 M∙s−1), surpassing the photocatalytic activity of all investigated references. Based on infrared spectroscopy measurements, it was found that the carbon sphere templates had different surface properties that could result in the appearance of carbonate species in the titania lattice. The presence or absence of these species was found to be the determining factor in the development of the titania’s properties.

Platinum nanoparticles partially-embedded into carbon sphere surfaces: a low metal-loading anode catalyst with superior performance for direct methanol fuel cells

2017 ◽  
Vol 5 (37) ◽  
pp. 19857-19865 ◽  
Author(s):  
Kui Li ◽  
Zhao Jin ◽  
Junjie Ge ◽  
Changpeng Liu ◽  
Wei Xing
Keyword(s):  
Fuel Cells ◽  
Platinum Nanoparticles ◽  
Direct Methanol Fuel Cells ◽  
Pt Nanoparticles ◽  
Superior Performance ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
Anode Catalyst ◽  
Direct Methanol ◽  
Methanol Fuel Cells

A robust architecture, consisting of Pt nanoparticles partially-embedded in carbon spheres with low loading, brings about outstanding electrocatalytic performance in DMFCs.

scholarly journals Facile construction of Fe, N and P co-doped carbon spheres by carbothermal strategy for the adsorption and reduction of U(vi)

RSC Advances ◽  
2020 ◽  
Vol 10 (57) ◽  
pp. 34859-34868
Author(s):  
Zhimin Dong ◽  
Zhibin Zhang ◽  
Runze Zhou ◽  
Yayu Dong ◽  
Yuanyuan Wei ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Removal Efficiency ◽  
Environmental Remediation ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
Practical Applications ◽  
Magnetic Carbon ◽  
Co Doped

The constructed novel magnetic carbon sphere co-doped by N, P, Fe (Fe/P-CN) exhibits high U(vi) removal efficiency, excellent magnetic separation and reusability, evidencing the potential practical applications in environmental remediation.

Efficient catalytic removal of airborne ozone under ambient conditions over manganese oxides immobilized on carbon nanotubes

2019 ◽  
Vol 9 (15) ◽  
pp. 4036-4046 ◽  
Author(s):  
Jian Ji ◽  
Yang Fang ◽  
Linsong He ◽  
Haibao Huang
Keyword(s):  
Carbon Nanotubes ◽  
Electron Transfer ◽  
Manganese Oxides ◽  
Ozone Decomposition ◽  
Ambient Conditions ◽  
Catalytic Removal

MnOx–CNT nanocomposites are efficient towards ozone decomposition owing to the electron transfer from the CNTs to MnOx that facilitates the activation of ozone.

scholarly journals Experimental Investigation of the Mechanical and Surface Properties of Sub-Micron Carbon Spheres

Lubricants ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 77
Author(s):  
Abdullah A. Alazemi ◽  
Arthur D. Dysart ◽  
Vilas G. Pol
Keyword(s):  
Elastic Modulus ◽  
Internal Structure ◽  
Surface Properties ◽  
Ion Beam ◽  
Lithium Ion ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
Carbon Particles ◽  
Oil Additives ◽  
Focus Ion Beam

This study investigates the mechanical and surface properties of spherical carbon particles. Sub-micrometer carbon spheres were previously used as oil additives to improve the tribological performance of oils, and as anode material to enhance the storage of rechargeable lithium-ion batteries. In the current work, internal structure and chemical analysis of these carbon sphere particles was conducted via focus ion beam scanning electron microscopy, and the results revealed that the carbon sphere particles are pure carbon particles with a solid internal structure. Atomic force microscopy (AFM) and nano-indenter were utilized to explore the mechanical properties (hardness and elastic modulus) of carbon sphere particles. The obtained results showed that the carbon spheres have an elastic modulus in the range of 10 to 42 GPa, while their hardness is in the range of 0.5 to 2.6 GPa. Besides, the AFM scans confirmed that the carbon particles are entirely separated and devoid of agglomeration. These results support the viable use of carbon sphere particles in various engineering applications.

Encapsulating sulfur into highly graphitized hollow carbon spheres as high performance cathode for lithium–sulfur batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 98035-98041 ◽  
Author(s):  
Shuangke Liu ◽  
Xiaobin Hong ◽  
Yujie Li ◽  
Jing Xu ◽  
Chunman Zheng ◽  
...  
Keyword(s):  
High Performance ◽  
High Capacity ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
Capacity Retention ◽  
High Discharge ◽  
High Discharge Capacity ◽  
Lithium Sulfur Batteries ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Encapsulating sulfur into a highly graphitized hollow carbon sphere (GHCS) is proposed as sulfur cathode, the S@GHCS delivers a high discharge capacity of ∼800 mA h g−1at 4C rate and high capacity retention of 93.7% after 240 cycles.

Preparation, Characterization and Application in Electromagnetic Wave Absorption of Core-Shell C/Fe3O4 Nanocomposites

2011 ◽  
Vol 239-242 ◽  
pp. 1725-1730 ◽  
Author(s):  
Qiang Chun Liu ◽  
Jian Ming Dai ◽  
Zhen Fa Zi ◽  
Da Jun Wu ◽  
Yu Ping Sun
Keyword(s):  
Electron Microscopy ◽  
Solution Method ◽  
Wide Frequency Range ◽  
Core Shell ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
X Ray Diffraction ◽  
Microwave Absorption Properties ◽  
Transmission Electron ◽  
Better Than

Large-quantity core-shell carbon spheres/Fe3O4nanocomposites were synthesized via a simple solution method. The phase structures and morphologies of the composite had been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the carbon spheres were covered by a layer of Fe3O4nanoparticles with a diameter of about 25 nm. Measurements of the electromagnetic parameters of the samples showed that microwave absorption properties of the carbon sphere-Fe3O4nanocomposites were much better than that of the pure Fe3O4or the mixtures of carbon spheres and Fe3O4microspheres. The optimal reflection loss (RL) reached −37.8 dB at 14.8 GHz for a layer thickness of 2.0 mm, which is favorable for application of our samples in a wide frequency range.

Carbon-coated silicon nanoparticle-embedded carbon sphere assembly electrodes with enhanced performance for lithium-ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (44) ◽  
pp. 38012-38017 ◽  
Author(s):  
Donghee Gueon ◽  
Jaehyun Lee ◽  
Joong Kee Lee ◽  
Jun Hyuk Moon
Keyword(s):  
Lithium Ion Batteries ◽  
Silicon Nanoparticles ◽  
High Capacity ◽  
Lithium Ion ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
Capacity Retention ◽  
Silicon Nanoparticle ◽  
Carbon Coated

We demonstrate carbon-coated silicon nanoparticles embedded in monodisperse carbon spheres for lithium-ion batteries with high capacity retention.

scholarly journals Structural, Morphological and Electrochemical Examination of Carbon Spheres Wrapped by Maghemite Nanoparticles

2019 ◽  
Vol 9 (1S4) ◽  
pp. 1076-1080
Keyword(s):  
Electrochemical Impedance ◽  
Sem Analysis ◽  
Morphological Properties ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
Average Grain Size ◽  
Pure Carbon ◽  
Mn3o4 Nanoparticles ◽  
Coated Carbon ◽  
Electrochemical Impedance Spectroscopic

In this work, pure carbon spheres (CSs) and Mn3O4 nanoparticles (NPs) embedded on carbon sphere were synthesized by hydrothermal method. The prepared CS/Mn3O4 was examined with structural, functional, and morphological properties by XRD, FTIR, and SEM analysis. The average grain size and crystalline size of Mn3O4 coated carbon sphere were found through morphological analysis. The element ratio, composition and distribution of the prepared Mn3O4 coated carbon sphere were analyzed through EDS and Mapping analysis. Electrochemical performance such as redox behavior, charge storage/discharge capacity and resistive nature of Mn3O4 /CSs was evaluated using cyclic voltammetry, chronopotentiometry, and electrochemical impedance spectroscopic analysis.

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