scholarly journals Emerging Technology for a Green, Sustainable Energy Promising Materials for Hydrogen Storage, from Nanotubes to Graphene—A Review

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2499
Author(s):  
Krzysztof Jastrzębski ◽  
Piotr Kula
Keyword(s):  
Energy Source ◽  
Hydrogen Storage ◽  
Mobile Applications ◽  
Emerging Technology ◽  
Green Energy ◽  
Point Of View ◽  
Energy Industry ◽  
Volumetric Density ◽  
Potential Use ◽  
Carbon Based

The energetic and climate crises should pose a challenge for scientists in finding solutions in the field of renewable, green energy sources. Throughout more than two decades, the search for new opportunities in the energy industry made it possible to observe the potential use of hydrogen as an energy source. One of the greatest challenges faced by scientists for the sake of its use as an energy source is designing safe, usable, reliable, and effective forms of hydrogen storage. Moreover, the manner in which hydrogen is to be stored is closely dependent on the potential use of this source of green energy. In stationary use, the aim is to achieve high volumetric density of the container. However, from the point of view of mobile applications, an extremely important aspect is the storage of hydrogen, using lightweight tanks of relatively high density. That is why, a focus of scientists has been put on the use of carbon-based materials and graphene as a perspective solution in the field of H2 storage. This review focuses on the comparison of different methods for hydrogen storage, mainly based on the carbon-based materials and focuses on efficiently using graphene and its different forms to serve a purpose in the future H2-based economy.

The growth of mica polytypes as studied by conventional and high-resolution TEM

1983 ◽  
Vol 41 ◽  
pp. 174-177
Author(s):  
A. Baronnet ◽  
M. Amouric
Keyword(s):  
Water Pressure ◽  
Point Of View ◽  
Temperature Fields ◽  
Natural Occurrence ◽  
Growth Mechanisms ◽  
Long Period ◽  
High Resolution Tem ◽  
Layer Stacking ◽  
Experimental Works ◽  
Potential Use

The origin of mica polytypes has long been a challenging problem for crystal- lographers, mineralogists and petrologists. From the petrological point of view, interest in this field arose from the potential use of layer stacking data to furnish further informations about equilibrium and/or kinetic conditions prevailing during the crystallization of the widespread mica-bearing rocks. From the compilation of previous experimental works dealing with the occurrence domains of the various mica "polymorphs" (1Mr, 1M, 2M1, 2M2 and 3T) within water-pressure vs temperature fields, it became clear that most of these modifications should be considered as metastable for a fixed mica species. Furthermore, the natural occurrence of long-period (or complex) polytypes could not be accounted for by phase considerations. This highlighted the need of a more detailed kinetic approach of the problem and, in particular, of the role growth mechanisms of basal faces could play in this crystallographic phenomenon.

Stable supercapacitor electrode based on two-dimensional high nucleus silver nano-clusters as a green energy source

2021 ◽  
Vol 50 (7) ◽  
pp. 2606-2615
Author(s):  
Jing Zhuge ◽  
Farzaneh Rouhani ◽  
Fahime Bigdeli ◽  
Xue-Mei Gao ◽  
Hamed Kaviani ◽  
...  
Keyword(s):  
Energy Source ◽  
Green Energy ◽  
Synthesis Methods ◽  
Two Dimensional ◽  
Supercapacitor Electrode ◽  
Nano Cluster

A novel 2D high nucleus silver nano-cluster was designed and synthesized by the combination of two synthesis methods (ultra-sonication and solvothermal) and was used as a supercapacitor electrode.

Nanocrystalline Mg-based hydrides for hydrogen storage

2001 ◽  
Vol 676 ◽  
Author(s):  
W. Oelerich ◽  
T. Klassen ◽  
R. Bormann
Keyword(s):  
Hydrogen Storage ◽  
Mobile Applications ◽  
Research Effort ◽  
Metal Hydrides ◽  
Clean Energy ◽  
High Energy ◽  
Sorption Kinetics ◽  
Desorption Kinetics ◽  
Gaseous State ◽  
Sorption Behaviour

ABSTRACTHydrogen is the ideal means of energy storage for transportation and conversion of energy in a comprehensive clean-energy concept. However, appropriate storage facilities, both for stationary and for mobile applications, are complicated, because of the very low boiling point of hydrogen (20.4 K at 1 atm) and its low density in the gaseous state (90 g/m3). Furthermore, the storage of hydrogen in liquid or gaseous form imposes safety problems, in particular for mobile applications, e.g. the future zero-emission vehicle. Metal hydrides are a safe alternative for H-storage and, in addition, have a high volumetric energy density that is about 60% higher than that of liquid hydrogen. Mg hydride has a high storage capacity by weight and is therefore favoured for automotive applications. However, so far light metal hydrides have not been considered competitive because of their rather sluggish sorption kinetics. Filling a tank could take several hours. Moreover, the hydrogen desorption temperature of about 300 °C is rather high for most applications. A breakthrough in hydrogen storage technology was achieved by preparing nanocrystalline hydrides using high-energy ball milling. These new materials show very fast aband desorption kinetics within few minutes, thus qualifying lightweight Mg-based hydrides for storage application. In this paper recent detailed results on the sorption behaviour of nanocrystalline Mg and Mg-based alloys are presented. In a following research effort the sorption kinetics of nanocrystalline Mg has been further enhanced by catalyst additions. Furthermore, different transition metals have been added to Mg to achieve a thermodynamic destabilisation of the hydride, thus lowering the desorption temperatures to about 230 °C. The newly developed materials are currently being tested in prototype storage tanks.

TRENDS IN THE FORMATION OF POLAND'S ENERGY POLICY IN THE FUEL AND ENERGY SECTOR OF THE EU COUNTRIES

2021 ◽  
Vol 2 (11) ◽  
pp. 167-173
Author(s):  
Mihail V. Rybin ◽  
◽  
Alexander A. Stepanov ◽  
Nadezhda V. Morozova ◽  
◽  
...  
Keyword(s):  
European Union ◽  
Energy Policy ◽  
Energy Sector ◽  
Green Energy ◽  
Point Of View ◽  
The European Union ◽  
The Russian Federation ◽  
Regional Programs ◽  
The Eu ◽  
Fuel And Energy Sector

The article reveals and analyzes conceptual approaches to the formation of strategic directions of energy policy of the European Union and Poland in the first decades of the XXI century. A critical assess-ment is given from the point of view of international cooperation in the field of energy between the Russian Federation, Poland and the EU as a whole and, in particular, European, national and regional programs for the transformation of the fuel and energy sector in the conditions of decarbonization and transition to green energy.

scholarly journals A Study of K/Ti-co-doped NaAlH4 on Thermodynamic Tailoring, Surplus Hydrogen Amount and Metal Hydride Molar Volume

2021 ◽  
Author(s):  
Roland Hermann Pawelke
Keyword(s):  
Hydrogen Storage ◽  
Molar Volume ◽  
Metal Hydride ◽  
Chemical Potential ◽  
Reaction Pathway ◽  
Ideal Gas ◽  
Point Of View ◽  
Phase Point ◽  
Desorption Enthalpy ◽  
Co Doped

A remarkable finding of metal hydride hydrogen storage is that substituting 4 mol % sodium by potassium in 4 mol % Ti-doped NaAlH<sub>4</sub> raises the reversible hydrogen storage capacity from 3.3 % w/w H to 4.7 % w/w H. This increase by 42% is concomitant with a slightly lower desorption enthalpy: intriguingly enough, it is substantially more hydrogen capacity at slightly less desorption enthalpy. The general solution to that puzzle has been already derived from a gas phase point of view, taking advantage of the equilibrium nature of the matter, which thus comes in terms of an ideal gas chemical potential. However, it is also interesting to investigate for the flipside effect in the sorbent phase, affecting molar volume. This paper elucidates by the example of K/Ti-co-doped NaAlH<sub>4</sub> the relation of doping modifications to surplus hydrogen amount and hydride molar volume, defining the term “reaction pathway” in this context, yielding the according figures.<br>

Hydrogen Storage in Carbon-Based Nanostructured Materials

2008 ◽  
Vol 26 (4) ◽  
pp. 297-305 ◽  
Author(s):  
A. R. Biris ◽  
D. Lupu ◽  
E. Dervishi ◽  
Z. Li ◽  
V. Saini ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Nanostructured Materials ◽  
Carbon Based
Sign in / Sign up

Export Citation Format

Share Document