The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Yoshitsugu Kojima - One of the best experts on this subject based on the ideXlab platform.
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reversible ammonia based and liquid organic Hydrogen carriers for high density Hydrogen storage recent progress
International Journal of Hydrogen Energy, 2019Co-Authors: Joshua W Makepeace, Yoshitsugu Kojima, Teng He, Claudia Weidenthaler, Torben R Jensen, Fei Chang, Tejs Vegge, Peter Ngene, Petra E De Jongh, Ping ChenAbstract:Abstract Liquid Hydrogen carriers are considered to be attractive Hydrogen storage options because of their ease of integration into existing chemical transportation infrastructures when compared with liquid or Compressed Hydrogen. The development of such carriers forms part of the work of the International Energy Agency Task 32: Hydrogen-Based Energy Storage. Here, we report the state-of-the-art for ammonia-based and liquid organic Hydrogen carriers, with a particular focus on the challenge of ensuring easily regenerable, high-density Hydrogen storage.
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high Compressed Hydrogen production via direct electrolysis of liquid ammonia
International Journal of Hydrogen Energy, 2016Co-Authors: Kiyotaka Goshome, Takahiro Yamada, Hiroki Miyaoka, Takayuki Ichikawa, Yoshitsugu KojimaAbstract:Abstract In this study, the direct electrolysis of liquid ammonia (NH3) by using ammonium chloride (NH4Cl) as an electrolyte to supply ammonium cation ( NH 4 + ) is performed. As a result, it is confirmed that a certain electric current is observed while voltage below 2.0 V is applied to the electrodes, which indicates that NH4Cl can work as an electrolyte for the electrolysis of liquid ammonia. Furthermore, generation of high Compressed Hydrogen by NH3 electrolysis is successfully demonstrated, where the inner pressure reaches 20 MPa. However, it is confirmed that the electrode corrosion on the anode occur during the electrolysis. Then, the corrosion mechanism of the anode electrode composed of stainless or platinum are investigated by gas chromatography for the generated gas, and powder x-ray diffraction measurement for the electrolyte after the electrolysis. Finally, it is concluded that a metal (M) of an anode electrode is ionized in the ammonia solution to form metal chloride (MClx) instead of the primary oxidation reaction for the electrolysis of ammonia.
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Compressed Hydrogen production via reaction between liquid ammonia and alkali metal hydride
International Journal of Hydrogen Energy, 2011Co-Authors: Hiroki Miyaoka, Takayuki Ichikawa, Satoshi Hino, Yoshitsugu KojimaAbstract:Abstract Ammonia NH3 is recognized as one of the attractive Hydrogen H2 carriers because it has a high Hydrogen content of 18 mass% and it is easily liquefied under about 1 MPa of pressure at a room temperature. NH3 can react with alkali metal hydrides and generate H2 even at room temperature, resulting that metal amides are formed as reaction products. The H2 generation is exothermic reaction, and it is not effectively prevented by H2 partial pressure in a closed system as thermodynamic properties. In this work, we demonstrated the production of Compressed H2 by the reaction between liquid NH3 and lithium hydride LiH in a closed pressure vessel, where liquid NH3 would realize better kinetic properties for the reaction with metal hydride than gaseous NH3. Actually, more than 12 MPa H2 was obtained within several hours.
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Compressed Hydrogen generation using chemical hydride
Journal of Power Sources, 2004Co-Authors: Yoshitsugu Kojima, Yasuaki Kawai, Haruyuki Nakanishi, Shinichi MatsumotoAbstract:Abstract In a closed pressure vessel, the reaction of sodium borohydride (NaBH 4 ) with Pt-LiCoO 2 catalyst and a stoichiometric amount of water drastically increases the pressure owing to the generation of large quantities of Hydrogen gas by synergism of Hydrogen pressure and the catalyst (gravimetric Hydrogen density per unit weight of NaBH 4 and H 2 O including the Pt-LiCoO 2 catalyst is 9.0 wt.%, volumetric Hydrogen density per unit weight of NaBH 4 and H 2 O including the Pt-LiCoO 2 catalyst is 101 kg H 2 /m −3 ). The Hydrogen densities are high enough to reach the US Department of Energy (DOE) targets for use in a fuel cell vehicle (FCV) and also for other applications such as a fuel cell uninterrupted power supply (FCUPS).
Ahmet Ozarslan - One of the best experts on this subject based on the ideXlab platform.
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large scale Hydrogen energy storage in salt caverns
International Journal of Hydrogen Energy, 2012Co-Authors: Ahmet OzarslanAbstract:Abstract Large-scale energy storage methods can be used to meet energy demand fluctuations and to integrate electricity generation from intermittent renewable wind and solar energy farms into power grids. Pumped hydropower energy storage method is significantly used for grid electricity storage requirements. Alternatives are underground storage of Compressed air and Hydrogen gas in suitable geological formations. Underground storage of natural gas is widely used to meet both base and peak load demands of gas grids. Salt caverns for natural gas storage can also be suitable for underground Compressed Hydrogen gas energy storage. In this paper, large quantities underground gas storage methods and design aspects of salt caverns are investigated. A pre-evaluation is made for a salt cavern gas storage field in Turkey. It is concluded that a system of solar-Hydrogen and natural gas can be utilised to meet future large-scale energy storage requirements.
David Chapelle - One of the best experts on this subject based on the ideXlab platform.
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analysis of intermetallic swelling on the behavior of a hybrid solution for Compressed Hydrogen storage part ii finite element method simulation
Materials & Design, 2012Co-Authors: David Chapelle, A Hocine, Stani Carbillet, M L BoubakarAbstract:Abstract The second part of this article is dedicated to a Finites Elements Models (FEM) simulation of a hybrid vessel for Hydrogen storage. This solution is made of a composite carbon/epoxy reinforcement coated on a metal liner first rolled up with an intermetallic material. The finite element method is a practical tool to study pressure vessel, especially when the local swelling of the intermetallic is introduced. In Part I, we presented an analytical modeling that allows to predict the effect of the intermetallic swelling on the mechanical response of the liner but also of the composite, while an homogeneous leakage of Hydrogen has occurred. Different sequences of the multilayer composite were investigated. In the first step of Part II, a good agreement is obtained between the analytical results of Part I and the numerical results of FEM for homogeneous before any swelling. The second step of Part II is to focus on the local swelling of the intermetallic using a finite element analysis, assuming a local Hydrogen leakage. Attention is paid on two different scenarios: After Isotropic Local Swelling (AILS) and an After Anisotropic Local Swelling (AALS). Results for both scenarios are then discussed.
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analysis of intermetallic swelling on the behavior of a hybrid solution for Compressed Hydrogen storage part i analytical modeling
Materials & Design, 2010Co-Authors: A Hocine, David Chapelle, Lamine Boubakar, Ali Benamar, A BezaziAbstract:Abstract This study focuses on the mechanical response of a hybrid solution dedicated to gaseous Hydrogen storage. This solution is made of a carbon/epoxy composite overwrapped on a metal liner first coated with intermetallic material. The composite helps to reinforce the structure, while the liner prevents it from any leakage. In case of deficiency, the intermetallic material behaves as a sponge and interrupts the leakage by absorption and micro-cracks reduction. This hybrid solution or this specific use of intermetallic material has never been presented before. The laminate composite is anisotropic, whereas the liner is an elastic–plastic material. The intermetallic is purely thermo elastic and its study is limited to its mechanical contribution. Using these hypotheses, the suggested analytical model provides an exact solution for stresses and strains on the cylindrical section of the hybrid solution submitted to thermomechanical static loading and Hydrogen leakage. The swelling effect of the intermetallic on the behavior of the structure is then investigated.
A Hocine - One of the best experts on this subject based on the ideXlab platform.
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analysis of intermetallic swelling on the behavior of a hybrid solution for Compressed Hydrogen storage part ii finite element method simulation
Materials & Design, 2012Co-Authors: David Chapelle, A Hocine, Stani Carbillet, M L BoubakarAbstract:Abstract The second part of this article is dedicated to a Finites Elements Models (FEM) simulation of a hybrid vessel for Hydrogen storage. This solution is made of a composite carbon/epoxy reinforcement coated on a metal liner first rolled up with an intermetallic material. The finite element method is a practical tool to study pressure vessel, especially when the local swelling of the intermetallic is introduced. In Part I, we presented an analytical modeling that allows to predict the effect of the intermetallic swelling on the mechanical response of the liner but also of the composite, while an homogeneous leakage of Hydrogen has occurred. Different sequences of the multilayer composite were investigated. In the first step of Part II, a good agreement is obtained between the analytical results of Part I and the numerical results of FEM for homogeneous before any swelling. The second step of Part II is to focus on the local swelling of the intermetallic using a finite element analysis, assuming a local Hydrogen leakage. Attention is paid on two different scenarios: After Isotropic Local Swelling (AILS) and an After Anisotropic Local Swelling (AALS). Results for both scenarios are then discussed.
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analysis of intermetallic swelling on the behavior of a hybrid solution for Compressed Hydrogen storage part i analytical modeling
Materials & Design, 2010Co-Authors: A Hocine, David Chapelle, Lamine Boubakar, Ali Benamar, A BezaziAbstract:Abstract This study focuses on the mechanical response of a hybrid solution dedicated to gaseous Hydrogen storage. This solution is made of a carbon/epoxy composite overwrapped on a metal liner first coated with intermetallic material. The composite helps to reinforce the structure, while the liner prevents it from any leakage. In case of deficiency, the intermetallic material behaves as a sponge and interrupts the leakage by absorption and micro-cracks reduction. This hybrid solution or this specific use of intermetallic material has never been presented before. The laminate composite is anisotropic, whereas the liner is an elastic–plastic material. The intermetallic is purely thermo elastic and its study is limited to its mechanical contribution. Using these hypotheses, the suggested analytical model provides an exact solution for stresses and strains on the cylindrical section of the hybrid solution submitted to thermomechanical static loading and Hydrogen leakage. The swelling effect of the intermetallic on the behavior of the structure is then investigated.
M L Boubakar - One of the best experts on this subject based on the ideXlab platform.
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analysis of intermetallic swelling on the behavior of a hybrid solution for Compressed Hydrogen storage part ii finite element method simulation
Materials & Design, 2012Co-Authors: David Chapelle, A Hocine, Stani Carbillet, M L BoubakarAbstract:Abstract The second part of this article is dedicated to a Finites Elements Models (FEM) simulation of a hybrid vessel for Hydrogen storage. This solution is made of a composite carbon/epoxy reinforcement coated on a metal liner first rolled up with an intermetallic material. The finite element method is a practical tool to study pressure vessel, especially when the local swelling of the intermetallic is introduced. In Part I, we presented an analytical modeling that allows to predict the effect of the intermetallic swelling on the mechanical response of the liner but also of the composite, while an homogeneous leakage of Hydrogen has occurred. Different sequences of the multilayer composite were investigated. In the first step of Part II, a good agreement is obtained between the analytical results of Part I and the numerical results of FEM for homogeneous before any swelling. The second step of Part II is to focus on the local swelling of the intermetallic using a finite element analysis, assuming a local Hydrogen leakage. Attention is paid on two different scenarios: After Isotropic Local Swelling (AILS) and an After Anisotropic Local Swelling (AALS). Results for both scenarios are then discussed.