scholarly journals Hydrogen Sorption and Reversibility of the LiBH4-KBH4 Eutectic System Confined in a CMK-3 Type Carbon via Melt Infiltration

2020 ◽  
Vol 6 (2) ◽  
pp. 19
Author(s):  
Filippo Peru ◽  
SeyedHosein Payandeh ◽  
Georgia Charalambopoulou ◽  
Torben R. Jensen ◽  
Theodore Steriotis
Keyword(s):  
Eutectic Mixture ◽  
Hydrogen Uptake ◽  
Decomposition Temperature ◽  
Carbon Surface ◽  
Side Reactions ◽  
Kinetic Properties ◽  
Eutectic System ◽  
High Hydrogen ◽  
Melt Infiltration ◽  
Interesting Approach

Metal borohydrides have very high hydrogen densities but their poor thermodynamic and kinetic properties hinder their use as solid hydrogen stores. An interesting approach to improve their functionality is nano-sizing by confinement in mesoporous materials. In this respect, we used the 0.725 LiBH4–0.275 KBH4 eutectic mixture, and by exploiting its very low melting temperature (378 K) it was possible to successfully melt infiltrate the borohydrides in a mesoporous CMK-3 type carbon (pore diameter ~5 nm). The obtained carbon–borohydride composite appears to partially alleviate the irreversibility of the dehydrogenation reaction when compared with the bulk LiBH4-KBH4, and shows a constant hydrogen uptake of 2.5 wt%–3 wt% for at least five absorption–desorption cycles. Moreover, pore infiltration resulted in a drastic decrease of the decomposition temperature (more than 100 K) compared to the bulk eutectic mixture. The increased reversibility and the improved kinetics may be a combined result of several phenomena such as the catalytic action of the carbon surface, the nano-sizing of the borohydride particles or the reduction of irreversible side-reactions.

A Large-Surface-Area Boracite-Network-Topology Porous MOF Constructed from a Conjugated Ligand Exhibiting a High Hydrogen Uptake Capacity

2009 ◽  
Vol 48 (16) ◽  
pp. 7519-7521 ◽  
Author(s):  
Xi-Sen Wang ◽  
Shengqian Ma ◽  
Daqiang Yuan ◽  
Ji Woong Yoon ◽  
Young Kyu Hwang ◽  
...  
Keyword(s):  
Surface Area ◽  
Network Topology ◽  
Hydrogen Uptake ◽  
Large Surface Area ◽  
Uptake Capacity ◽  
High Hydrogen

An Interweaving MOF with High Hydrogen Uptake

2006 ◽  
Vol 128 (12) ◽  
pp. 3896-3897 ◽  
Author(s):  
Daofeng Sun ◽  
Shengqian Ma ◽  
Yanxiong Ke ◽  
David J. Collins ◽  
Hong-Cai Zhou
Keyword(s):  
Hydrogen Uptake ◽  
High Hydrogen

Hydrogen adsorption calculations in expanded graphite and amorphous carbons

2009 ◽  
Vol 1216 ◽  
Author(s):  
Lujian Peng ◽  
James Robert Morris
Keyword(s):  
Monte Carlo ◽  
Hydrogen Adsorption ◽  
Physical Adsorption ◽  
Expanded Graphite ◽  
Hydrogen Uptake ◽  
Moderate Pressure ◽  
Grand Canonical Monte Carlo ◽  
High Hydrogen ◽  
Carbon Structures ◽  
Grand Canonical

AbstractThis paper uses an efficient and accurate approach to estimate the hydrogen physical adsorption in various carbon structures. By comparing with previous Grand Canonical Monte Carlo (GCMC) and other methods on expanded graphite, the introduced method is shown to be accurate, but the calculation is much faster and more intuitive. Our preliminary results in amorphous carbons show high hydrogen uptake close to 0.8% at 300 K and moderate pressure.

scholarly journals The effect of Nb on the high strain rate hydrogen embrittlement of Q&P steel

2021 ◽  
Vol 250 ◽  
pp. 03007
Author(s):  
Florian Vercruysse ◽  
Lisa Claeys ◽  
Tom Depover ◽  
Kim Verbeken ◽  
Patricia Verleysen ◽  
...  
Keyword(s):  
Strain Rate ◽  
High Strength Steels ◽  
Thermal Desorption Spectroscopy ◽  
High Strength ◽  
Hydrogen Uptake ◽  
High Hydrogen ◽  
Damage Initiation ◽  
Advanced High Strength Steels ◽  
Dynamic Tensile Loading ◽  
Carbon Martensite

Quenching and Partitioning (Q&P) steels are, due to their excellent combination of strength and ductility, seen as good candidates for the third generation advanced high strength steels (AHSS). Although the TRIP effect is beneficial for the overall mechanical behaviour of these steels it potentially can have detrimental effects when strained in a hydrogenenriched environment. The solubility of hydrogen is high in austenite but low in high carbon martensite. Martensite is even in the absence of hydrogen already a possible damage initiation spot. The effect of hydrogen under static and dynamic tensile loading was evaluated in a Q&P and a Nb micro-alloyed Q&P steel. Experiments were carried out under a strain rate ranging from 0.03 s-1 till 500 s-1 and correlated with the hydrogen uptake characterised via thermal desorption spectroscopy (TDS). The presence of Nb resulted in a 25% increase in the hydrogen uptake capacity. A higher susceptibility to hydrogen was observed in the Nb steel partially due to the high hydrogen fraction, but also because of the larger fraction of low stability austenite. However, when tested under dynamic conditions the hydrogen susceptibility is minor and even improved in the micro-alloyed Q&P steel compared to the standard Q&P steel.

Hydrogen Sorption Behavior in Conducting Polymer Nanostructures

2009 ◽  
Author(s):  
Michael U. Niemann ◽  
Sesha S. Srinivasan ◽  
Ayala R. Phani ◽  
Ashok Kumar ◽  
D. Yogi Goswami ◽  
...  
Keyword(s):  
Electrospun Nanofibers ◽  
Hydrogen Uptake ◽  
Hydrogen Sorption ◽  
Sorption Behavior ◽  
High Hydrogen ◽  
Templating Method ◽  
Polyaniline Nanofibers ◽  
Before And After ◽  
Different Temperatures ◽  
Saturation Effects

Conducting polyaniline nanofibers were synthesized using chemical templating method followed by electrospun process. These nanofibers have been compared with their standard bulk counterpart and found to be stable up to 150°C. Polyaniline nanofibers prepared by electrospun method reveal high hydrogen uptake of 10wt.% at around 100°C in the first absorption run. However, in the consecutive hydrogenation and dehydrogenation cycles, the hydrogen capacity diminishes. This is most likely due to hydrogen loading into the polymer matrix, chemisorption and saturation effects. A reversible hydrogen storage capacity of ∼3–10 wt.% was also found in the new batch of electrospun nanofibers at different temperatures. The surface morphologies before and after hydrogen sorption of these PANI nanofibers encompass significant changes in the microstructure (nanofibrallar swelling effect) which clearly suggest effective hydrogen uptake and release.

scholarly journals Reversible Hydrogen Storage Using Nanocomposites

2020 ◽  
Vol 10 (13) ◽  
pp. 4618
Author(s):  
Sesha Srinivasan ◽  
Dervis Emre Demirocak ◽  
Ajeet Kaushik ◽  
Meenu Sharma ◽  
Ganga Ram Chaudhary ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Metal Organic Framework ◽  
Pd Nanoparticles ◽  
Hydrogen Uptake ◽  
High Specific Surface Area ◽  
High Hydrogen ◽  
Complex Hydrides ◽  
Metal Organic ◽  
Host Metal ◽  
Sorption Characteristics

In the field of energy storage, recently investigated nanocomposites show promise in terms of high hydrogen uptake and release with enhancement in the reaction kinetics. Among several, carbonaceous nanovariants like carbon nanotubes (CNTs), fullerenes, and graphitic nanofibers reveal reversible hydrogen sorption characteristics at 77 K, due to their van der Waals interaction. The spillover mechanism combining Pd nanoparticles on the host metal-organic framework (MOF) show room temperature uptake of hydrogen. Metal or complex hydrides either in the nanocomposite form and its subset, nanocatalyst dispersed alloy phases illustrate the concept of nanoengineering and nanoconfinement of particles with tailor-made properties for reversible hydrogen storage. Another class of materials comprising polymeric nanostructures such as conducting polyaniline and their functionalized nanocomposites are versatile hydrogen storage materials because of their unique size, high specific surface-area, pore-volume, and bulk properties. The salient features of nanocomposite materials for reversible hydrogen storage are reviewed and discussed.

scholarly journals Mixed-linker approach in designing porous zirconium-based metal–organic frameworks with high hydrogen storage capacity

2016 ◽  
Vol 52 (50) ◽  
pp. 7826-7829 ◽  
Author(s):  
Ayesha Naeem ◽  
Valeska P. Ting ◽  
Ulrich Hintermair ◽  
Mi Tian ◽  
Richard Telford ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
High Selectivity ◽  
Storage Capacity ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Hydrogen Uptake ◽  
Hydrogen Storage Capacity ◽  
High Hydrogen ◽  
Metal Organic ◽  
Adsorption Of Co

New zirconium based metal–organic framework (UBMOF-31) synthesised using mixed-linker strategy showing permanent porosity, excellent hydrogen uptake, and high selectivity for adsorption of CO2 over N2.

A heterometallic microporous MOF exhibiting high hydrogen uptake

2013 ◽  
Vol 165 ◽  
pp. 20-26 ◽  
Author(s):  
Wei Wei ◽  
Zhengqiang Xia ◽  
Qing Wei ◽  
Gang Xie ◽  
Sanping Chen ◽  
...  
Keyword(s):  
Hydrogen Uptake ◽  
High Hydrogen

Mechano-Chemical Synthesis and Characterization of New Complex Hydrides for Hydrogen Storage

2006 ◽  
Vol 927 ◽  
Author(s):  
Sesha Srinivasan ◽  
Luis Rivera ◽  
Elias Stefanakos ◽  
Yogi Goswami
Keyword(s):  
Chemical Synthesis ◽  
Hydrogen Storage ◽  
Decomposition Temperature ◽  
Advanced Materials ◽  
Grand Challenge ◽  
Gravimetric Analysis ◽  
High Hydrogen ◽  
Complex Hydrides ◽  
The Us

AbstractMechano-chemical synthesis has been employed to prepare new light weight complex borohydrides. The precursor complex borohydrides such as NaBH4 and LiBH4 have been used since these materials posses high hydrogen storage capacity of 13.0 and 19.6 wt.%. This advanced materials based technology will meet the US-DOE grand challenge technical targets. The thermal calorimetric and gravimetric analysis of these complex borohydrides exhibits the hydrogen decomposition temperature (Tdec) of 100–150° C with theoretical capacity of ∼8.0-10.0 wt%. The catalysts (e.g. ZnCl2, TiFx3) doping and destabilization of the borohydride by reacting with binary hydride (MgH2) reveals the enhancement of decomposition kinetics and reversible dehydrogenation-rehydrogenation behavior.

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