scholarly journals Three-Dimensional S/CeO2/RGO Composites as Cathode Materials for Lithium–Sulfur Batteries

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1720 ◽  
Author(s):  
Qiuyan Hao ◽  
Guoliang Cui ◽  
Yuan Tian ◽  
Taizhe Tan ◽  
Yongguang Zhang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Three Dimensional ◽  
Reversible Capacity ◽  
Gravimetric Analysis ◽  
X Ray ◽  
Transmission Electron ◽  
Lithium Sulfur Batteries ◽  
3D Composite ◽  
Composition Structure ◽  
Lithium Sulfur

In this paper, the synthesis of the three-dimensional (3D) composite of spherical reduced graphene oxide (RGO) with uniformly distributed CeO2 particles is reported. This synthesis is done via a facile and large-scalable spray-drying process, and the CeO2/RGO materials are hydrothermally compounded with sulfur. The morphology, composition, structure, and electrochemical properties of the 3D S/CeO2/RGO composite are studied using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), Raman spectra and X-ray photoelectron spectroscopy (XPS), etc. The electrochemical performance of the composites as electrodes for lithium–sulfur batteries is evaluated. The S/CeO2/RGO composites deliver a high initial capacity of 1054 mAh g−1, and retain a reversible capacity of 792 mAh g−1 after 200 cycles at 0.1 C. Profiting from the combined effect of CeO2 and RGO, the CeO2/RGO materials effectively inhibit the dissolution of polysulfides, and the coating of spherical RGO improves the structural stability as well as conductivity.

scholarly journals Synthesis of Three-Dimensional Fe3O4/Graphene Aerogels for the Removal of Arsenic Ions from Water

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Yan Ye ◽  
Da Yin ◽  
Bin Wang ◽  
Qingwen Zhang
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
3D Structure ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Graphene Aerogels ◽  
Transmission Electron ◽  
Potential Applications ◽  
Removal Of Arsenic

We report the synthesis of three-dimensional Fe3O4/graphene aerogels (GAs) and their application for the removal of arsenic (As) ions from water. The morphology and properties of Fe3O4/GAs have been characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and superconducting quantum inference device. The 3D nanostructure shows that iron oxide nanoparticles are decorated on graphene with an interconnected network structure. It is found that Fe3O4/GAs own a capacity of As(V) ions adsorption up to 40.048 mg/g due to their remarkable 3D structure and existence of magnetic Fe3O4nanoparticles for separation. The adsorption isotherm matches well with the Langmuir model and kinetic analysis suggests that the adsorption process is pseudo-second-ordered. In addition to the excellent adsorption capability, Fe3O4/GAs can be easily and effectively separated from water, indicating potential applications in water treatment.

scholarly journals Three-dimensional image based modelling of transport parameters in lithium–sulfur batteries

2019 ◽  
Vol 21 (8) ◽  
pp. 4145-4154 ◽  
Author(s):  
Chun Tan ◽  
Matthew D. R. Kok ◽  
Sohrab R. Daemi ◽  
Daniel J. L. Brett ◽  
Paul R. Shearing
Keyword(s):  
Computed Tomography ◽  
Electrical Conductivity ◽  
Three Dimensional ◽  
Transport Parameters ◽  
X Ray ◽  
Dimensional Image ◽  
Molecular Diffusivity ◽  
Lithium Sulfur Batteries ◽  
Sulfur Electrode ◽  
Lithium Sulfur

A sulfur electrode was imaged with X-ray micro and nano computed tomography for the modelling of effective molecular diffusivity and electrical conductivity through flux based simulations.

Sulfur/Co3O4 nanotube composite with high performances as cathode materials for lithium sulfur batteries

2014 ◽  
Vol 07 (03) ◽  
pp. 1450020 ◽  
Author(s):  
Hong Cheng ◽  
Shengping Wang ◽  
Du Tao ◽  
Man Wang
Keyword(s):  
Electron Microscopy ◽  
Initial Discharge Capacity ◽  
Sulfur Cathode ◽  
X Ray ◽  
Capacity Reservation ◽  
Initial Discharge ◽  
Transmission Electron ◽  
Bet Analysis ◽  
Lithium Sulfur Batteries ◽  
Lithium Sulfur

To improve the overall electrochemical performance of the sulfur cathode in Li / S batteries, a hollow Co 3 O 4 nanotube with a channel measuring approximately 12.5 nm in diameter is synthesized and then impregnated with sulfur via a melt-diffusion strategy. X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) analysis and thermogravimetric analysis indicate that sulfur impregnated the channels of the hollow Co 3 O 4 nanotube. Because the sulfur is mostly restricted to the Co 3 O 4 nanotubes, a sulfur/ Co 3 O 4 cathode with 10 wt.% sulfur loading delivers an initial discharge capacity of 963.4 mAh g-1, with much of the capacity contributed by Co 3 O 4, and exhibits excellent reversibility with a capacity reservation of 80.8% after 100 cycles.

Large Scale Preparation of β-AgVO3 Nanowires Using a Novel Sonochemical Route

2008 ◽  
Vol 8 (6) ◽  
pp. 3203-3207 ◽  
Author(s):  
Changjie Mao ◽  
Xingcai Wu ◽  
Jun-Jie Zhu
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Photoelectron Spectroscopy ◽  
Large Scale ◽  
Lithium Ion ◽  
Gravimetric Analysis ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Transmission

A large number of β-AgVO3 nanowires with diameter of 30–60 nm, and length of 1.5–3 μm have been successfully synthesized by a simple and facile low-temperature sonochemical route. The morphologies and structures of the nanowires were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning transmission electron microscopy (SEM), and thermal gravimetric analysis (TGA). Cyclic voltammetry and charge–discharge experiments were applied to characterize the electrochemical properties of the nanowires as cathode materials for lithium-ion batteries. In the initial discharge and charge process, the as-prepared β-AgVO3 nanowires showed the initial charge and discharge capacities of 69 and 102 (mAh)/g, respectively. It is anticipated that the β-AgVO3 nanostructures are promising cathode candidates in the application of primary lithium-ion batteries.

Effect of Sputtering Input Power of Co on Structure and Magnetic Properties of Fe-Co-N Thin Films

2009 ◽  
Vol 79-82 ◽  
pp. 635-638 ◽  
Author(s):  
Xin Wang ◽  
Hui Jia ◽  
Wei Tao Zheng ◽  
Wei Xu ◽  
Bei Hong Long
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Photoelectron Spectroscopy ◽  
Quantum Interference ◽  
Input Power ◽  
Superconducting Quantum Interference Device ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Composition Structure

Fe-Co-N thin films with various Co content were synthesized on Si (111) substrate using facing-target magnetron sputtering by changing sputtering input power on Co target. During deposition, the input power on Fe target was kept at 160 W. The composition, structure, and magnetic properties were examined by X-ray photoelectron spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and superconducting quantum interference device. XRD and TEM investigations showed that at lower input power of 11.2 W on Co target, the phases in the film were -(Fe,Co)4N and Co3N. Increasing sputtering input power, the content of Co in the film increased. At input power of 14 W, film contained -(Fe,Co)8N phase was produced which exhibited higher saturation magnetization (252.85 Am2/kg) and lower value of coercivity (3.66 kAm-1), corresponded to the 12% content of Co in the film.

One-Pot Synthesis of Nanodendritic PtIr Alloy with High Electrochemical Activity for Ethylene Glycol Oxidation

NANO ◽  
2017 ◽  
Vol 12 (02) ◽  
pp. 1750026 ◽  
Author(s):  
Xuedong Gao ◽  
Lulu Liu ◽  
Qiyu Wang ◽  
Kun Qi ◽  
Zhao Jin ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Photoelectron Spectroscopy ◽  
Three Dimensional ◽  
One Pot ◽  
X Ray ◽  
Electrochemical Tests ◽  
Transmission Electron ◽  
Ethylene Glycol Oxidation ◽  
Networks Structure ◽  
20 Nm

Nanodendritic Pt-based bimetallic alloys are one promising catalyst with three-dimensional (3D) networks structure composed of integrating branches for electrochemical catalytic reaction. We successfully synthesized dendrites Pt6Ir4 alloy with small size of 20 nm in oleylamine. The dendritic Pt6Ir4 alloy are characterized by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical tests suggest that the as-prepared dendritic Pt6Ir4 alloy exhibits greatly enhanced ethylene glycol oxidation reaction (EGOR) activity than commercial Pt/C with high EGOR mass activity, anti-poisoning and stability.

Identify the Active Phase of Fe–CN Composites for Oxidation Removal of Rhodamine B with H2O2

2019 ◽  
Vol 233 (7) ◽  
pp. 1035-1045
Author(s):  
Tingting Diao ◽  
Wenyao Wang ◽  
Xuelian Xu ◽  
Ping Xiao ◽  
Duihai Tang ◽  
...  
Keyword(s):  
Rhodamine B ◽  
Photoelectron Spectroscopy ◽  
Guanidine Hydrochloride ◽  
Active Phase ◽  
Atomic Emission ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Catalytic Performances

AbstractFe-containing carbon nitrides (Fe–CN) prepared with various CN precursors, including dicyandiamide, melamine, guanidine hydrochloride and urea, were characterized by X-ray diffraction, thermal gravimetric analysis, N2physisorption, transmission electron microscopy, X-ray photoelectron spectroscopy and atomic emission spectrometer measurements, and used as catalysts to catalyze the rhodamine B oxidation with H2O2as oxidant. Characteristic results showed that Fe–CN exhibits different compositions, properties and catalytic performances if different CN precursors are used. The Fe–CN prepared from dicyandiamide contains mainly CN phase and certain amounts of surface Fe2O3phase, exhibits the best activity; while that prepared from urea contains mainly Fe2O3phase and few amounts of CN phase, exhibits the worst activity. Contrasting experiments conducted under light irradiation, with a supported Fe/CN_D catalyst, and that using a washed catalyst, suggested that the surface Fe2O3is the active site of the reaction.

Preparation of Tubular HNTs@PDA–Au Nanocomposites and its Electrocatalysis of Hydrazine

NANO ◽  
2018 ◽  
Vol 13 (02) ◽  
pp. 1850019 ◽  
Author(s):  
Xinjin Zhang ◽  
Qinglin Sheng ◽  
Jianbin Zheng
Keyword(s):  
Photoelectron Spectroscopy ◽  
Halloysite Nanotubes ◽  
Good Effect ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
X Ray ◽  
Structure And Property ◽  
Transmission Electron ◽  
Response Performance ◽  
Composition Structure

Halloysite nanotubes@polydopamine (HNTs@PDA) nanocomposites were successfully synthesized, and Au nanoparticles (Au NPs) were loaded on HNTs@PDA by electrostatic adsorption. The electrochemical sensor based on HNTs@PDA–Au nanocomposites was constructed. The effect of the composition, structure and property of HNTs@PDA–Au on the response performance of the sensor was explored. The morphology and composition of the nanocomposites were characterized by field emission scanning electron microscopy, transmission electron microscopic, X-ray diffraction, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Electrochemical results revealed HNTs@PDA–Au as the sensing interface with good effect on electrocatalytic oxidation of N2H4. This sensor detected N2H4 in the range from 0.75[Formula: see text][Formula: see text]mol[Formula: see text]L[Formula: see text] to 2.8[Formula: see text]mmol[Formula: see text]L[Formula: see text], with a sensitivity of 171.7[Formula: see text][Formula: see text]A (mmol[Formula: see text]L[Formula: see text][Formula: see text]cm[Formula: see text] and a detection limit of 0.25[Formula: see text][Formula: see text]mol[Formula: see text]L[Formula: see text] (S/N [Formula: see text] 3).

scholarly journals A study of electrocatalytic ethanol oxidation of nanoporous PtSi alloy

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Nali Lu ◽  
Yao Li ◽  
Lei Zhang ◽  
Yong Fang ◽  
Bin Qian ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Three Dimensional ◽  
Oxidation Reactions ◽  
X Ray Diffraction ◽  
Direct Ethanol Fuel Cells ◽  
X Ray ◽  
Transmission Electron ◽  
Bicontinuous Structure ◽  
Average Size ◽  
Catalyzed Oxidation

In recent years, nanoporous alloys have presented the advantages of a large specific surface area, low density, and simple operation, and they have been widely used in the fields of catalysis, magnetism, and medicine. Nanoporous Pt-Si alloy was prepared by melt-spun and chemical dealloying, and was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscope, and transmission electron microscopy. Pt-Si alloys possess a three-dimensional bicontinuous structure and an average size of 5 nanometers. Compared with commercial Pt/C catalysts, nanoporous Pt-Si alloys exhibit excellent electrocatalytic activity and stability in ethanol-catalyzed oxidation reactions. It is taken into consideration to be a promising catalyst in direct ethanol fuel cells.

3D Observation of Elemental Distribution of Si-Device using a Dedicated FIB/STEM System

2005 ◽  
Author(s):  
T. Yaguchi ◽  
M. Konno ◽  
T. Kamino ◽  
M. Ogasawara ◽  
K. Kaji ◽  
...  
Keyword(s):  
Focused Ion Beam ◽  
Ion Beam ◽  
Three Dimensional ◽  
Elemental Distribution ◽  
Multivariate Statistical ◽  
X Ray ◽  
Sample Rotation ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Elemental Maps

Abstract A technique for preparation of a pillar shaped sample and its multi-directional observation of the sample using a focused ion beam (FIB) / scanning transmission electron microscopy (STEM) system has been developed. The system employs an FIB/STEM compatible sample rotation holder with a specially designed rotation mechanism, which allows the sample to be rotated 360 degrees [1-3]. This technique was used for the three dimensional (3D) elemental mapping of a contact plug of a Si device in 90 nm technology. A specimen containing a contact plug was shaped to a pillar sample with a cross section of 200 nm x 200 nm and a 5 um length. Elemental analysis was performed with a 200 kV HD-2300 STEM equipped with the EDAX genesis Energy dispersive X-ray spectroscopy (EDX) system. Spectrum imaging combined with multivariate statistical analysis (MSA) [4, 5] was used to enhance the weak X-ray signals of the doped area, which contain a low concentration of As-K. The distributions of elements, especially the dopant As, were successfully enhanced by MSA. The elemental maps were .. reconstructed from the maps.

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