Hydrogen storage in MgH2 coated single walled carbon nanotubes

Pandyan, R. Kodi; Seenithurai, S.; Mahendran, M.

doi:10.1016/j.ijhydene.2010.11.091

Cited by 19 publications

(7 citation statements)

References 24 publications

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“…In addition to the metallic catalytic agents, compounds and metastable modifier agents, metal-oxides (e.g., Nb 2 O 5 [41], Cr 2 O 3 [41], TiO 2 [42], and La 2 O 3 [43]), -carbides (e.g., SiC [44], and TiC [45]), -hydrides (e.g., TiH 2 [11], LaH 3 [46], and NbH [46]), and carbon-based nanomaterials such as carbon nanotubes [47], graphene, and nanofibers [48] have been successfully used to enhance the hydrogen storage behavior of MgH 2 .…”

Section: • Catalyzationmentioning

confidence: 99%

Cold Gas-Dynamic Spray for Catalyzation of Plastically Deformed Mg-Strips with Ni Powder

et al. 2021

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Magnesium hydride (MgH2) has received significant attention due to its potential applications as solid-state hydrogen storage media for useful fuel cell applications. Even though MgH2 possesses several attractive hydrogen storage properties, it cannot be utilized in fuel cell applications due to its high thermal stability and poor hydrogen uptake/release kinetics. High-energy ball milling, and mechanically-induced cold-rolling processes are the most common techniques to introduce severe plastic deformation and lattice imperfection in the Mg/MgH2. Furthermore, using one or more catalytic agents is considered a practical solution to improve both the de-/rehydrogenation process of MgH2.These treatments are usually dedicated to enhance its hydrogen storage properties and deduce its thermal stability. However, catalyzation of Mg/MgH2 powders with a desired catalytic agent using ball milling process has shown some disadvantages due to the uncontrolled distribution of the agent particles in the MgH2 powder matrix. The present study has been undertaken to employ a cold gas-dynamic spray process for catalyzing the fresh surfaces of mechanically-induced cold-rolled Mg ribbons with Ni powder particles. The starting Mg-rods were firstly heat treated and forged 200 times before cold rolling for 300 passes. The as-treated ribbons were then catalyzed by Ni particles, using cold gas-dynamic spray process. In this catalyzation approach, the Ni particles were carried by a stream of Ar gas via a high-velocity jet at a supersonic velocity. Accordingly, the pelted Ni particles penetrated the Mg-substrate ribbons, and hence created numerous micropores into the Mg, allowed the Ni particles to form a homogeneous network of catalytic active sites in Mg substrate. As the number of coating time increased to three times, the Ni concentration increased (5.28 wt.%), and this led to significant enhancement of the Mg-hydrogen storage capacity, as well as improving the de-/rehydrogenation kinetics. This is evidenced by the high value of hydrogen storage capacity (6.1 wt.% hydrogen) and the fast gas uptake kinetics (5.1 min) under moderate pressure (10 bar) and temperature (200 °C). The fabricated nanocomposite MgH2/5.28 wt.% Ni strips have shown good dehydrogenation behavior, indicated by their capability to desorb 6.1 wt.% of hydrogen gas within 11 min at 200 °C under 200 mbar of hydrogen pressure. Moreover, this system possessed long cycle-life-time, which extended to 350 h with a minimal degradation in the storage and kinetics behavior.

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Section: • Catalyzationmentioning

confidence: 99%

Cold Gas-Dynamic Spray for Catalyzation of Plastically Deformed Mg-Strips with Ni Powder

et al. 2021

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“…At present, the added metal catalysts are mainly Pd [117,125,129,130,135,140,141,143,[151][152][153][154][155][156][157][158][159], Mg [160][161][162], Ni [98,136,139,163,164], Ti [34,137,138,165,166], Li [132,144,150,167], Al [102,168,169], etc.…”

Section: Loading Metalsmentioning

confidence: 99%

An Overview of the Recent Progress in Modifications of Carbon Nanotubes for Hydrogen Adsorption

2020

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Many researchers have carried out experimental research and theoretical analysis on hydrogen storage in carbon nanotubes (CNTs), but the results are very inconsistent. The present paper reviewed recent progress in improving the hydrogen storage properties of CNTs by various modifications and analyzed the hydrogen storage mechanism of CNTs. It is certain that the hydrogen storage in CNTs is the result of the combined action of physisorption and chemisorption. However, H2 adsorption on metal-functionalized CNTs still lacks a consistent theory. In the future, the research of CNTs for hydrogen adsorption should be developed in the following three directions: (1) A detailed study of the optimum number of metal atoms without aggregation on CNT should be performed, at the same time suitable preparation methods for realizing controllable doping site and doped configurations should be devised; (2) The material synthesis, purification, and activation methods have to be optimized; (3) Active sites, molecular configurations, effectively accessible surface area, pore size, surface topology, chemical composition of the surface, applied pressure and temperature, defects and dopant, which are some of the important factors that strongly affect the hydrogen adsorption in CNTs, should be better understood.

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“…In my opinion, the kinetics condition as well as the thermodynamic condition of catalyzed samples are reduced. The role of MWCNTs dispersed on the surface of prepared materials not only prompt the recombination of Hatoms through the electronic interaction between highly active surface of MWCNTs and hydrogen atoms, but provide "fast channels" for the diffusion of the H-atoms due to their special tubular structure [33,49]. As for the TiF 3 , the catalytic role is attributed to the catalytic activity on the desorption processes of Mg 2 NiH 4 by strongly promoting the cracking and enhancing the desorption properties of Mg 2 NiH 4 .…”

Section: Activation Energy Of Hydrogen Desorptionmentioning

confidence: 99%

Hydrogen desorption performance of high-energy ball milled Mg 2 NiH 4 catalyzed by multi-walled carbon nanotubes coupling with TiF 3

Hou

Zhang

et al. 2014

International Journal of Hydrogen Energy

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Hydrogen storage in MgH2 coated single walled carbon nanotubes

Cited by 19 publications

References 24 publications

Cold Gas-Dynamic Spray for Catalyzation of Plastically Deformed Mg-Strips with Ni Powder

Cold Gas-Dynamic Spray for Catalyzation of Plastically Deformed Mg-Strips with Ni Powder

An Overview of the Recent Progress in Modifications of Carbon Nanotubes for Hydrogen Adsorption

Hydrogen desorption performance of high-energy ball milled Mg 2 NiH 4 catalyzed by multi-walled carbon nanotubes coupling with TiF 3

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