Temporal and spatial imaging of hydrogen storage materials: watching solvent and hydrogen desorption from aluminium hydride by transmission electron microscopy

2008 ◽  
pp. 4448 ◽  
Author(s):  
Shane D. Beattie ◽  
Terry Humphries ◽  
Louise Weaver ◽  
G. Sean McGrady
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Hydrogen Storage ◽  
Hydrogen Desorption ◽  
Hydrogen Storage Materials ◽  
Storage Materials ◽  
Transmission Electron ◽  
Temporal And Spatial

scholarly journals Advanced SEM and TEM Techniques Applied in Mg-Based Hydrogen Storage Research

Scanning ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Jianding Li ◽  
Jincheng Xu ◽  
Bo Li ◽  
Liqing He ◽  
Huaijun Lin ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Hydrogen Storage ◽  
Formation Mechanisms ◽  
Hydrogen Storage Materials ◽  
Storage Materials ◽  
Sem And Tem ◽  
Transmission Electron ◽  
Structures And Properties ◽  
Composition Determination ◽  
The Relationship

Mg-based materials are regarded as one of the most promising candidates for hydrogen storage. In order to clarify the relationship between the structures and properties as well as to understand the reaction and formation mechanisms, it is beneficial to obtain useful information about the size, morphology, and microstructure of the studied materials. Herein, the use of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques for the representation of Mg-based hydrogen storage materials is described. The basic principles of SEM and TEM are presented and the characterizations of the size, morphology observation, phase and composition determination, and formation and reaction mechanisms clarification of Mg-based hydrogen storage materials are discussed. The applications of advanced SEM and TEM play significant roles in the research and development of the next-generation hydrogen storage materials.

Crystallitic Structure and Thermodynamics of Magnesium-Based Hydrogen Storage Materials from Reactive Milling under Hydrogen Atmosphere

2013 ◽  
Vol 724-725 ◽  
pp. 1021-1024
Author(s):  
Shi Xue Zhou ◽  
Qian Qian Zhang ◽  
Nai Fei Wang ◽  
Zong Ying Han ◽  
Wei Xian Ran ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Xrd Analysis ◽  
Hydrogen Desorption ◽  
Hydrogen Atmosphere ◽  
Hydrogen Storage Materials ◽  
Storage Materials ◽  
Reactive Milling ◽  
Anthracite Coal ◽  
Enthalpy And Entropy Changes ◽  
Hoff Equation

Magnesium-based hydrogen storage materials were prepared by reactive milling of magnesium under hydrogen atmosphere with crystallitic carbon, prepared from anthracite coal, as milling aid. The XRD analysis shows that in the presence of 30 wt.% of crystallitic carbon, the Mg easily hydrided into β-MgH2of crystal grain size 29.7 nm and a small amount of γ-MgH2after 3 h of milling under 1 MPa H2. The enthalpy and entropy changes of the hydrogen desorption reaction are 42.7 kJ/mol and 80.7 J/mol K, respectively, calculated by the vant Hoff equation from thep-C-Tdata in 300-380°C.

Recent developments of the in situ wet cell technology for transmission electron microscopies

Nanoscale ◽  
2015 ◽  
Vol 7 (11) ◽  
pp. 4811-4819 ◽  
Author(s):  
Xin Chen ◽  
Chang Li ◽  
Hongling Cao
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Scanning Transmission Electron Microscopy ◽  
Liquid Environment ◽  
Electron Microscopies ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Recent Developments ◽  
Temporal And Spatial

In situ wet cells for transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) allow studying structures and processes in a liquid environment with high temporal and spatial resolutions, and have been attracting increasing research interests in many fields.

Interrelation between Hydrogen Desorption Kinetics and Structure of (Mg2Ni)Hx and Hydrogenated Eutectic(Mg/Mg2Ni)Hy

2009 ◽  
Vol 289-292 ◽  
pp. 167-174
Author(s):  
Jiri Cermak ◽  
Lubomir Kral
Keyword(s):  
Diffusion Coefficient ◽  
Binary System ◽  
Low Temperature ◽  
Hydrogen Storage ◽  
Eutectic Mixture ◽  
Hydrogen Desorption ◽  
Desorption Kinetics ◽  
Hydrogen Storage Materials ◽  
Storage Materials ◽  
Intermetallic Diffusion

Mg-rich alloys of the binary system Mg-Ni are prospective hydrogen-storage materials. In the present study, desorption characteristics of hydrided Mg2Ni intermetalic and hydrided Mg/Mg2Ni eutectic mixture were investigated. Structure of experimental materials during the hydrogenation was observed by SEM. Three modifications of (Mg2Ni)Hx (x ~ 4) were prepared differing in the ratio of two low-temperature phases f = LT2/LT1: with (i) f >1, (ii) f ~ 1 and with (iii) f <1. Evolution of the ratio f during hydrogen desorption was checked by XRD. It was found that the micro-twinned phase LT2 is not desirable in hydrogen-storage materials containing Mg2Ni intermetallic. Diffusion coefficient of hydrogen in LT2 is about 20 times lower than in LT1.

Cycling hydrogen desorption properties and microstructures of MgH2–AlH3–NbF5 hydrogen storage materials

Rare Metals ◽  
2020 ◽  
Author(s):  
Xiao-Sheng Liu ◽  
Hai-Zhen Liu ◽  
Ning Qiu ◽  
Yan-Bing Zhang ◽  
Guang-Yao Zhao ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Desorption ◽  
Hydrogen Storage Materials ◽  
Storage Materials

Techniques for Transmission Electron Microscopy of Fiber-Matrix Interfaces in Aluminum Alloy-Boron Composites by Ion Erosio

1971 ◽  
Vol 29 ◽  
pp. 204-205
Author(s):  
G. G. Shaw
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Aluminum Alloy ◽  
Electron Beam ◽  
Pure Aluminum ◽  
Ion Milling ◽  
Transmission Electron ◽  
Fiber Matrix ◽  
Ion Erosion ◽  
Row Of Fibers

The morphology and composition of the fiber-matrix interface can best be studied by transmission electron microscopy and electron diffraction. For some composites satisfactory samples can be prepared by electropolishing. For others such as aluminum alloy-boron composites ion erosion is necessary.When one wishes to examine a specimen with the electron beam perpendicular to the fiber, preparation is as follows: A 1/8 in. disk is cut from the sample with a cylindrical tool by spark machining. Thin slices, 5 mils thick, containing one row of fibers, are then, spark-machined from the disk. After spark machining, the slice is carefully polished with diamond paste until the row of fibers is exposed on each side, as shown in Figure 1.In the case where examination is desired with the electron beam parallel to the fiber, preparation is as follows: Experimental composites are usually 50 mils or less in thickness so an auxiliary holder is necessary during ion milling and for easy transfer to the electron microscope. This holder is pure aluminum sheet, 3 mils thick.

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