scholarly journals Light Weight Complex Metal Hydrides for Reversible Hydrogen Storage

2021 ◽  
Author(s):  
Sesha Srinivasan ◽  
Luis Rivera ◽  
Diego Escobar ◽  
Elias Stefanakos
Keyword(s):  
Hydrogen Storage ◽  
Metal Hydride ◽  
Metal Hydrides ◽  
Light Weight ◽  
X Ray Diffraction ◽  
Ambient Temperatures ◽  
Complex Metal ◽  
Complex Hydrides ◽  
Microstructural Surface ◽  
New Phase

We have investigated the complex metal hydrides involving light weight elements or compounds for the reversible hydrogen storage. The complex hydrides are prepared via an inexpensive solid state mechanochemical process under reactive atmosphere at ambient temperatures. The complex metal hydride, LiBH4 with different mole concentrations of ZnCl2 were characterized for the new phase formation and hydrogen decomposition characteristics of Zn(BH4)2. Furthermore, the complex metal hydride is destabilized using the addition of nano MgH2 for the reversible hydrogen storage characteristics. The structural, microstructural, surface, and other physicochemical behaviors of these lightweight complex metal hydrides have been studied via various metrological tools such as x-ray diffraction, Fourier transform infrared spectroscopy, thermal programed desorption, and PCT hydrogen absorption methods.

scholarly journals Hydrogen storage in complex metal hydrides

2009 ◽  
Vol 74 (2) ◽  
pp. 183-196 ◽  
Author(s):  
Borislav Bogdanovic ◽  
Michael Felderhoff ◽  
Guido Streukens
Keyword(s):  
Fuel Cells ◽  
Solid State ◽  
Thermodynamic Properties ◽  
Hydrogen Storage ◽  
Sodium Borohydride ◽  
Metal Hydride ◽  
Metal Hydrides ◽  
Hydrogen Storage Materials ◽  
High Hydrogen ◽  
Complex Metal

Complex metal hydrides such as sodium aluminohydride (NaAlH4) and sodium borohydride (NaBH4) are solid-state hydrogen-storage materials with high hydrogen capacities. They can be used in combination with fuel cells as a hydrogen source thus enabling longer operation times compared with classical metal hydrides. The most important point for a wide application of these materials is the reversibility under moderate technical conditions. At present, only NaAlH4 has favorable thermodynamic properties and can be employed as a thermally reversible means of hydrogen storage. By contrast, NaBH4 is a typical non-reversible complex metal hydride; it reacts with water to produce hydrogen.

Metal-Complex Hydrides for Hydrogen-Storage Application

2005 ◽  
Vol 475-479 ◽  
pp. 2437-2440
Author(s):  
Xing Long Gou ◽  
Li Na Xu ◽  
Wei Yang Li ◽  
Jun Chen ◽  
Qiang Xu
Keyword(s):  
Hydrogen Storage ◽  
Metal Complex ◽  
Photoelectron Spectroscopy ◽  
Catalytic Mechanism ◽  
X Ray Diffraction ◽  
X Ray ◽  
Complex Hydrides ◽  
Transmission Electron ◽  
Dehydrogenation Kinetics ◽  
Transfer State

Metal-complex hydrides Li3AlH6 and V-doped Li3AlH6 nanoparticles were synthesized by solid reactions of LiH and LiAlH4 in the absence and in the presence of VCl3, respectively. X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer- Emmett-Teller sorption, thermogravimetry and differential thermal analysis have been used to investigate the phase composition, microstructure and surface properties. Not only the nanocrystalline Li3AlH6, but also the coexisting catalyst with “valence-transfer” state can influence the dehydrogenation kinetics. The extension of the catalytic mechanism is attractive for reversible hydrogen storage of the alanate system.

Catalyzed Complex Metal Hydrides

MRS Bulletin ◽  
2002 ◽  
Vol 27 (9) ◽  
pp. 712-716 ◽  
Author(s):  
Borislav Bogdanović ◽  
Gary Sandrock
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Historical Perspective ◽  
Catalytic Mechanism ◽  
Metal Hydrides ◽  
Complex Metal ◽  
Sodium Alanate ◽  
Storage Media ◽  
Complex Hydrides

AbstractComplex hydrides are mixed ionic–covalent compounds that can serve as reversible H2 storage media only when they are catalyzed by a transition metal such as Ti. As the prime example, the phenomenology of Ti-catalyzed sodium alanate (NaAlH4) is reviewed from a historical perspective. Dehydriding yields a theoretical 5.6 wt% H2 during two-step decomposition, NaAlH4 → Na3AlH6 → NaH + Al, although 100% recovery of that H2 is not currently possible. H2 can be discharged and recharged at practical rates at 125°C. More work is needed on the alanates, in particular, as well as the identification and optimization of the catalytic mechanism and a broad extension of the concept to other than Na-based alanates. The possibility of an even further extension of the concept to other complex hydrides (e.g., the borohydrides and transition-metal complexes) is discussed.

scholarly journals A metal-oxide catalyst enhanced the desorption properties in complex metal hydrides

2014 ◽  
Vol 2 (12) ◽  
pp. 4361-4365 ◽  
Author(s):  
Tengfei Zhang ◽  
Shigehito Isobe ◽  
Yongming Wang ◽  
Hiroshi Oka ◽  
Naoyuki Hashimoto ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Hydrogen Storage ◽  
Lithium Ion Battery ◽  
Oxide Catalyst ◽  
Metal Hydrides ◽  
Lithium Ion ◽  
Metal Oxide Catalyst ◽  
Complex Metal ◽  
Battery Material ◽  
First Time

It is reported for the first time, that the desorption properties in complex metal hydrides (MgH2, LiAlH4, and LiNH2) are enhanced by a lithium-ion-battery material, LiTi2O4. Three different systems for hydrogen storage are catalysed by one material.

Transient Plane Source Method for Thermal Property Measurements of Metal Hydrides

2008 ◽  
Author(s):  
Scott Flueckiger ◽  
Yuan Zheng ◽  
Timothe´e Pourpoint
Keyword(s):  
Thermal Conductivity ◽  
Stainless Steel ◽  
Thermal Diffusivity ◽  
Hydrogen Storage ◽  
Thermal Property ◽  
Metal Hydride ◽  
Metal Hydrides ◽  
Flash Method ◽  
Plane Source ◽  
Transient Plane Source

Metal hydrides are promising hydrogen storage materials with potential for practical use in a passenger car. To be a viable hydrogen storage option, metal hydride heat transfer behavior must be well understood and accounted for. As such, the thermal properties of the metal hydride are measured and compiled to assess this behavior. These properties include thermal conductivity, specific heat, and thermal diffusivity. The transient plane source (TPS) method was selected primarily due to a high level of versatility, including customization for high pressure hydrogen environments. To perform this measurement, a TPS 2500 S thermal property analyzer by the Hot Disk Company was employed. To understand the measurement and analysis process of the TPS method, two different sample materials were evaluated at ambient conditions. These samples included a stainless steel pellet and an inactivated (non-pyrophoric) metal hydride pellet. Thermal conductivity and thermal diffusivity of these samples were measured using the TPS method. The thermal property measurements are compared to the data available in the literature (stainless steel) and the data obtained using laser flash method (metal hydride). The improvements needed to successfully implement the TPS method are discussed in detail.

Electronic Structure and Bonding Characteristic of NdMgNi4H4

2010 ◽  
Vol 152-153 ◽  
pp. 1422-1425
Author(s):  
Bao Jun Wang ◽  
Rui Ying Li ◽  
Xiao Ping Dong ◽  
Li Guan ◽  
Jian Gang Niu
Keyword(s):  
Electronic Structure ◽  
Metal Hydride ◽  
First Principles ◽  
Metal Hydrides ◽  
First Principles Calculations ◽  
Complex Metal ◽  
Calculation Results ◽  
Structure And Bonding ◽  
Bonding Characteristics ◽  
Bonding Characteristic

We performed first-principles calculations to the electronic structure and bonding characteristic of NdMgNi4H4. The calculation results show that the H—Ni units are formed by the covalent H—Ni bonds, the surrounding Mg and Nd atoms provide electrons to the H—Ni units, and the Ni-Ni bonds between the different H—Ni units are covalent, making the H—Ni units not isolated. These bonding characteristics show that NdMgNi4H4 is similar with interstitial metal hydride in some aspects, and similar with complex metal hydrides in other aspects, indicating NdMgNi4H4 is the intermediate between interstitial metal hydrides and complex metal hydrides.

Recent advances in the theory of hydrogen storage in complex metal hydrides

MRS Bulletin ◽  
2013 ◽  
Vol 38 (6) ◽  
pp. 462-472 ◽  
Author(s):  
Kyle Jay Michel ◽  
Vidvuds Ozoliņš
Keyword(s):  
Hydrogen Storage ◽  
Metal Hydrides ◽  
Complex Metal ◽  
Recent Advances ◽  
Image Position

Abstract

Modelling of Thermodynamic Pressure – Composition – Temperature Relationships in the Systems of Metallic Hydride Forming Materials with Gaseous Hydrogen Using C++ Software

2019 ◽  
Vol 14 (3) ◽  
Author(s):  
Mapula Lucey Moropeng ◽  
Andrei Kolesnikov ◽  
Mykhaylo Lototskyy ◽  
Avhafunani Mavhungu
Keyword(s):  
Nonlinear Equation ◽  
Hydrogen Storage ◽  
Numerical Method ◽  
Metal Hydride ◽  
Metal Hydrides ◽  
Gaseous Hydrogen ◽  
Newton Raphson ◽  
Thermodynamic Pressure ◽  
The Relationship ◽  
Raphson Method

Abstract In this paper, the solution of the Lacher model describing the relationship between the Pressure – Composition, and Temperature (PCT diagrams) of AB5 type metal-hydrides (LaNi4.8Sn0.2, LmNi4.91Sn0.15, LaNi4.5Al0.5) for hydrogen storage using C ++ platform, with the help of a numerical method of nonlinear equation, Newton-Raphson method is presented. This study focuses on the development of a C ++ code to describe the iteration of Newton-Raphson for application in Hydrogen to Metal-Hydride systems.

Electronic Structure and Bonding Characteristic of LaMgNi4H4

2010 ◽  
Vol 160-162 ◽  
pp. 876-879
Author(s):  
Bao Jun Wang ◽  
Lu Jia Zhu
Keyword(s):  
Electronic Structure ◽  
Metal Hydride ◽  
First Principles ◽  
Metal Hydrides ◽  
First Principles Calculations ◽  
Complex Metal ◽  
Calculation Results ◽  
Structure And Bonding ◽  
Bonding Characteristics ◽  
Bonding Characteristic

We performed first-principles calculations to the electronic structure and bonding characteristic of LaMgNi4H4. The calculation results show that the H—Ni units are formed by the covalent H—Ni bonds, the surrounding Mg and La atoms provide electrons to the H—Ni units, and the Ni-Ni bonds between the different H—Ni units are covalent, making the H—Ni units not isolated. These bonding characteristics show that LaMgNi4H4 is similar with interstitial metal hydride in some aspects, and similar with complex metal hydrides in other aspects, indicating LaMgNi4H4 is the intermediate between interstitial metal hydrides and complex metal hydrides.

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