scholarly journals Graphene oxide/metal nanocrystal multilaminates as the atomic limit for safe and selective hydrogen storage

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Eun Seon Cho ◽  
Anne M. Ruminski ◽  
Shaul Aloni ◽  
Yi-Sheng Liu ◽  
Jinghua Guo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Hydrogen Storage ◽  
High Pressures ◽  
Storage Capacity ◽  
Hydrogen Fuel ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Reduced Graphene ◽  
Atomic Limit ◽  
Scientific Challenge

Abstract Interest in hydrogen fuel is growing for automotive applications; however, safe, dense, solid-state hydrogen storage remains a formidable scientific challenge. Metal hydrides offer ample storage capacity and do not require cryogens or exceedingly high pressures for operation. However, hydrides have largely been abandoned because of oxidative instability and sluggish kinetics. We report a new, environmentally stable hydrogen storage material constructed of Mg nanocrystals encapsulated by atomically thin and gas-selective reduced graphene oxide (rGO) sheets. This material, protected from oxygen and moisture by the rGO layers, exhibits exceptionally dense hydrogen storage (6.5 wt% and 0.105 kg H2 per litre in the total composite). As rGO is atomically thin, this approach minimizes inactive mass in the composite, while also providing a kinetic enhancement to hydrogen sorption performance. These multilaminates of rGO-Mg are able to deliver exceptionally dense hydrogen storage and provide a material platform for harnessing the attributes of sensitive nanomaterials in demanding environments.

scholarly journals Catalytic Hydrolysis of Ammonia Borane by Cobalt Nickel Nanoparticles Supported on Reduced Graphene Oxide for Hydrogen Generation

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Yuwen Yang ◽  
Fei Zhang ◽  
Hualan Wang ◽  
Qilu Yao ◽  
Xiangshu Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Hydrogen Storage ◽  
Reduced Graphene Oxide ◽  
Ammonia Borane ◽  
Reducing Agent ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Reduced Graphene ◽  
Total Turnover

Well dispersed magnetically recyclable bimetallic CoNi nanoparticles (NPs) supported on the reduced graphene oxide (RGO) were synthesized by one-step in situ coreduction of aqueous solution of cobalt(II) chloride, nickel (II) chloride, and graphite oxide (GO) with ammonia borane (AB) as the reducing agent under ambient condition. The CoNi/RGO NPs exhibits excellent catalytic activity with a total turnover frequency (TOF) value of 19.54 mol H2 mol catalyst−1 min−1and a low activation energy value of 39.89 kJ mol−1at room temperature. Additionally, the RGO supported CoNi NPs exhibit much higher catalytic activity than the monometallic and RGO-free CoNi counterparts. Moreover, the as-prepared catalysts exert satisfying durable stability and magnetically recyclability for the hydrolytic dehydrogenation of AB, which make the practical reusing application of the catalysts more convenient. The usage of the low-cost, easy-getting catalyst to realize the production of hydrogen under mild condition gives more confidence for the application of ammonia borane as a hydrogen storage material. Hence, this general method indicates that AB can be used as both a potential hydrogen storage material and an efficient reducing agent, and can be easily extended to facile preparation of other RGO-based metallic systems.

Hydrogen storage in a chemical bond stabilized Co9S8–graphene layered structure

Nanoscale ◽  
2015 ◽  
Vol 7 (47) ◽  
pp. 20180-20187 ◽  
Author(s):  
Wei Qin ◽  
Lu Han ◽  
Hai Bi ◽  
Jiahuang Jian ◽  
Xiaohong Wu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Hydrogen Storage ◽  
Reduced Graphene Oxide ◽  
Layered Structure ◽  
Storage Capacity ◽  
High Energy ◽  
Hydrogen Storage Capacity ◽  
Reduced Graphene ◽  
Milling Method ◽  
Energy Ball

With the high energy ball milling method, a Co9S8-decorated reduced graphene oxide (RGO) composite, which shows excellent hydrogen storage capacity, has been successfully fabricated with a well-organized layered structure.

Hydrogen Storage Investigation of Fixed Bed of Nanocrystalline Mg-Ni-Cr Mixed Oxides

2013 ◽  
Vol 701 ◽  
pp. 179-183
Author(s):  
M. Abdus Salam ◽  
Suriati Sufian ◽  
Thanabalan Murugesan
Keyword(s):  
Hydrogen Storage ◽  
Storage Capacity ◽  
Mixed Oxides ◽  
Fixed Bed ◽  
Hydrogen Storage Material ◽  
Ambient Conditions ◽  
Storage Material ◽  
Hydrogen Storage Capacity ◽  
Adsorption Enthalpy ◽  
Icp Ms

nanocrystalline mixed oxides containing magnesium, nickel and chromium (MNCM) have been synthesized as an adsorbent using coprecipitation method and showed its reversible hydrogen storage capacity at ambient conditions using fixed bed. XRD and ICP-MS analyses ensured the adsorbents phase and homogeneity. The microstructure of mixed oxide has been investigated using FESEM and BET and TEM technique respectively. The adsorbent consisted of mesoporous surface with a surface area of 254-370 m2gm-1and SAED pattern showed that the adsorbents are poly-crystalline. The mixed oxides exhibited a 3.2 wt% H2storage capacity and release 57% of adsorbed H2. Adsorption enthalpy (H) and entropy (S) change of-27.58 kJ/mol and-70.21 J/mol.K are indicating favorable thermodynamics for reversible hydrogen storage material.

scholarly journals Design of V-Substituted TiFe-Based Alloy for Target Pressure Range and Easy Activation

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4829
Author(s):  
Mohammad Faisal ◽  
June-Hyung Kim ◽  
Young Whan Cho ◽  
Jae-il Jang ◽  
Jin-Yoo Suh ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Pressure Range ◽  
Room Temperature ◽  
Storage Capacity ◽  
Alloy Composition ◽  
Plateau Pressure ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Step Process ◽  
Target Pressure

Titanium iron (TiFe) alloy is a room-temperature hydrogen-storage material, and it absorbs hydrogen via a two-step process to form TiFeH and then TiFeH2. The effect of V addition in TiFe alloy was recently elucidated. The V substitution for Ti sublattice lowers P2/P1 ratio, where P1 and P2 are the equilibrium plateau pressure for TiFe/TiFeH and TiFeH/TiFeH2, respectively, and thus restricts the two-step hydrogenation within a narrow pressure range. The focus of the present investigation was to optimize the V content such that maximum usable storage capacity can be achieved for the target pressure range: 1 MPa for absorption and 0.1 MPa for desorption. The effect of V substitution at selective Ti or Fe sublattices was closely analyzed, and the alloy composition Ti46Fe47.5V6.5 displayed the best performance with ca. 1.5 wt.% of usable capacity within the target pressure range. At the same time, another issue in TiFe-based alloys, which is a difficulty in activation at room temperature, was solved by Ce addition. It was shown that 3 wt.% Ce dispersion in TiFe alloy imparted to it easy room-temperature (RT) activation properties.

Catalyzed KSiH3as a reversible hydrogen storage material

2016 ◽  
Vol 4 (48) ◽  
pp. 19045-19052 ◽  
Author(s):  
R. Janot ◽  
W. S. Tang ◽  
D. Clémençon ◽  
J.-N. Chotard
Keyword(s):  
Solid State ◽  
Hydrogen Storage ◽  
Storage Capacity ◽  
Hydrogen Storage Material ◽  
Ambient Conditions ◽  
Storage Material ◽  
Hydrogen Storage Capacity ◽  
Hydrogen Storage Kinetics ◽  
Reversible Formation ◽  
Kinetics Of

Solid-state hydrogen storage through the reversible formation of metallic hydrides is a key issue for the development of hydrogen as an energy vector. Here the hydrogen storage kinetics of the reaction between KSi and KSiH3have been strongly enhanced by catalyst addition. The reaction is perfectly reversible near ambient conditions with a 4.1 wt% hydrogen storage capacity.

scholarly journals Significant improvement in the hydrogen storage capacity of a reduced graphene oxide/TiO2 nanocomposite by chemical bonding of Ti–O–C

RSC Advances ◽  
2016 ◽  
Vol 6 (39) ◽  
pp. 32831-32838 ◽  
Author(s):  
Zahra Gohari Bajestani ◽  
Alp Yürüm ◽  
Yuda Yürüm
Keyword(s):  
Graphene Oxide ◽  
Hydrogen Storage ◽  
Reduced Graphene Oxide ◽  
Chemical Bonding ◽  
Chemical Method ◽  
Storage Capacity ◽  
Hydrogen Storage Capacity ◽  
Reduced Graphene

A series of graphene-based nanocomposites with different TiO2 contents have been prepared via a facile chemical method.

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