scholarly journals Titanium Hydride Nanoplates Enable 5 wt% of Reversible Hydrogen Storage by Sodium Alanate below 80°C

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Zhuanghe Ren ◽  
Xin Zhang ◽  
Hai-Wen Li ◽  
Zhenguo Huang ◽  
Jianjiang Hu ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Practical Application ◽  
Metathesis Reaction ◽  
Hydrogen Capacity ◽  
Storage Performance ◽  
Sodium Alanate ◽  
Operation Temperature ◽  
Capacity Loss ◽  
Dehydrogenation Kinetics ◽  
Hydrogen Storage Performance

Sodium alanate (NaAlH4) with 5.6 wt% of hydrogen capacity suffers seriously from the sluggish kinetics for reversible hydrogen storage. Ti-based dopants such as TiCl4, TiCl3, TiF3, and TiO2 are prominent in enhancing the dehydrogenation kinetics and hence reducing the operation temperature. The tradeoff, however, is a considerable decrease of the reversible hydrogen capacity, which largely lowers the practical value of NaAlH4. Here, we successfully synthesized a new Ti-dopant, i.e., TiH2 as nanoplates with ~50 nm in lateral size and ~15 nm in thickness by an ultrasound-driven metathesis reaction between TiCl4 and LiH in THF with graphene as supports (denoted as NP-TiH2@G). Doping of 7 wt% NP-TiH2@G enables a full dehydrogenation of NaAlH4 at 80°C and rehydrogenation at 30°C under 100 atm H2 with a reversible hydrogen capacity of 5 wt%, superior to all literature results reported so far. This indicates that nanostructured TiH2 is much more effective than Ti-dopants in improving the hydrogen storage performance of NaAlH4. Our finding not only pushes the practical application of NaAlH4 forward greatly but also opens up new opportunities to tailor the kinetics with the minimal capacity loss.

TiN catalyst for the reversible hydrogen storage performance of sodium alanate system

2012 ◽  
Vol 22 (27) ◽  
pp. 13782 ◽  
Author(s):  
Li Li ◽  
Fangyuan Qiu ◽  
Yijing Wang ◽  
Guang Liu ◽  
Yanan Xu ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Storage Performance ◽  
Sodium Alanate ◽  
Tin Catalyst ◽  
Hydrogen Storage Performance

NbF5 and CrF3 Catalysts Effects on Synthesis and Hydrogen Storage Performance of Mg-Ni-NiO Composites

2013 ◽  
Vol 681 ◽  
pp. 31-37
Author(s):  
Qi Wan ◽  
Ping Li ◽  
Teng Wang ◽  
Xuan Hui Qu
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Pressure ◽  
Storage Capacity ◽  
Hydrogen Storage Capacity ◽  
High Hydrogen ◽  
Hydrogen Capacity ◽  
Storage Performance ◽  
Desorption Temperature ◽  
Hydrogen Storage Performance ◽  
Potential Use

Two kinds of novel materials, Mg-1.6mol%Ni-0.4mol%NiO-2mol%MF (MF=NbF5, CrF3), along with Mg-1.6mol%Ni-0.4mol%NiO for comparison, were examined for their potential use in hydrogen storage applications, having been fabricated via cryomilling. The effects of NbF5 and CrF3 on hydrogen storage performance were investigated. A microstructure analysis showed that, aside from the main phase Mg, Ni and NiO phases, NbO, MgF2 and Mg2Ni were present in all samples after ball milling, MgH2 and NbH2 were observed in all samples after absorption. The CrF3-containing composite exhibited a good PCT results and a low onset desorption temperature under 0.1 MPa. The NbF5-containing composite exhibited a low absorption temperature of 323 K, a high hydrogen storage capacity of 4.03wt% at 373 K under the hydrogen pressure of 4.0 MPa, and it absorbed 90% of its full hydrogen capacity in 2700 sec and 100% in 5100 sec, it desorbed more than 1.8wt% in 3600 sec under vacuum environment. The CrF3-doped sample exhibited a low onset desorption temperature of 543 K under 0.1 MPa, and a low hysteresis coefficient of 0.25 at 573 K, and lower than 0.2 when temperature was 623 K. NbO and NbH2 played an important role in improving the absorption and desorption performance.

Hydrogen storage in Ti–V-based body-centered-cubic phase alloys

2003 ◽  
Vol 18 (11) ◽  
pp. 2533-2536 ◽  
Author(s):  
Xuebin Yu ◽  
Zhu Wu ◽  
Baojia Xia ◽  
Taizhong Huang ◽  
Jinzhou Chen ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Cast Alloy ◽  
Absorption Capacity ◽  
Cubic Phase ◽  
Body Centered Cubic ◽  
Practical Application ◽  
Storage Performance ◽  
Single Body ◽  
Hydrogen Storage Performance ◽  
Effective Hydrogen

The hydrogen storage performance of a single body-centered-cubic phase Ti-40V-10Cr-10Mn alloy was investigated. A hydrogen absorption capacity of 4.2 wt.% (H/M = 2.1), which is the highest value at room temperature reported so far, was achieved at 293 K under modest pressure (3 MPa) for this as-cast alloy. The effective hydrogen capacities of this alloy were 2.6, 2.8, and 3.2 wt.%, respectively, at 353, 393, and 523 K, which gave hope of bringing Ti-V-based alloys into the reach of practical application for onboard hydrogen storage systems in fuel cell-powered vehicles.

Effect of LiCl presence on the hydrogen storage performance of the Mg(NH2)2–2LiH composite

RSC Advances ◽  
2015 ◽  
Vol 5 (84) ◽  
pp. 68542-68550 ◽  
Author(s):  
N. S. Gamba ◽  
P. Arneodo Larochette ◽  
F. C. Gennari
Keyword(s):  
Hydrogen Storage ◽  
Storage Capacity ◽  
Hydrogen Storage Capacity ◽  
Storage Performance ◽  
Dehydrogenation Kinetics ◽  
Hydrogen Storage Performance

The decrease in the dehydrogenation kinetics and hydrogen storage capacity during Mg(NH2)2–2LiH cycling is related with the Li4(NH2)3Cl formation and the incomplete Li2Mg2(NH2)3 rehydrogenation.

scholarly journals Realizing Hydrogen De/Absorption Under Low Temperature for MgH2 by Doping Mn-Based Catalysts

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1745
Author(s):  
Ze Sun ◽  
Liuting Zhang ◽  
Nianhua Yan ◽  
Jiaguang Zheng ◽  
Ting Bian ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Room Temperature ◽  
Storage Systems ◽  
Hydrogenation Reaction ◽  
Future Application ◽  
Practical Application ◽  
Doping Amount ◽  
Storage Performance ◽  
Hydrogen Storage Performance ◽  
Mn Doped

Magnesium hydride (MgH2) has been considered as a potential material for storing hydrogen, but its practical application is still hindered by the kinetic and thermodynamic obstacles. Herein, Mn-based catalysts (MnCl2 and Mn) are adopted and doped into MgH2 to improve its hydrogen storage performance. The onset dehydrogenation temperatures of MnCl2 and submicron-Mn-doped MgH2 are reduced to 225 °C and 183 °C, while the un-doped MgH2 starts to release hydrogen at 315 °C. Further study reveals that 10 wt% of Mn is the better doping amount and the MgH2 + 10 wt% submicron-Mn composite can quickly release 6.6 wt% hydrogen in 8 min at 300 °C. For hydrogenation, the completely dehydrogenated composite starts to absorb hydrogen even at room temperature and almost 3.0 wt% H2 can be rehydrogenated in 30 min under 3 MPa hydrogen at 100 °C. Additionally, the activation energy of hydrogenation reaction for the modified MgH2 composite significantly decreases to 17.3 ± 0.4 kJ/mol, which is much lower than that of the primitive MgH2. Furthermore, the submicron-Mn-doped sample presents favorable cycling stability in 20 cycles, providing a good reference for designing and constructing efficient solid-state hydrogen storage systems for future application.

scholarly journals Enhanced Hydrogen Storage Properties of Li-RHC System with In-House Synthesized AlTi3 Nanoparticles

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7853
Author(s):  
Thi-Thu Le ◽  
Claudio Pistidda ◽  
Julián Puszkiel ◽  
María Victoria Castro Riglos ◽  
David Michael Dreistadt ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogenation Reaction ◽  
Kinetic Behavior ◽  
High Hydrogen ◽  
Hydrogen Storage Properties ◽  
Storage Performance ◽  
Dehydrogenation Kinetics ◽  
Hydrogen Storage Performance ◽  
Kinetics Of ◽  
Storage Properties

In recent years, the use of selected additives for improving the kinetic behavior of the system 2LiH + MgB2 (Li-RHC) has been investigated. As a result, it has been reported that some additives (e.g., 3TiCl3·AlCl3), by reacting with the Li-RHC components, form nanostructured phases (e.g., AlTi3) possessing peculiar microstructural properties capable of enhancing the system’s kinetic behavior. The effect of in-house-produced AlTi3 nanoparticles on the hydrogenation/dehydrogenation kinetics of the 2LiH + MgB2 (Li-RHC) system is explored in this work, with the aim of reaching high hydrogen storage performance. Experimental results show that the AlTi3 nanoparticles significantly improve the reaction rate of the Li-RHC system, mainly for the dehydrogenation process. The observed improvement is most likely due to the similar structural properties between AlTi3 and MgB2 phases which provide an energetically favored path for the nucleation of MgB2. In comparison with the pristine material, the Li-RHC doped with AlTi3 nanoparticles has about a nine times faster dehydrogenation rate. The results obtained from the kinetic modeling indicate a change in the Li-RHC hydrogenation reaction mechanism in the presence of AlTi3 nanoparticles.

Hydrogen storage performance of methyl-substituted mesoporous silica with tailored textural characteristics

2021 ◽  
Author(s):  
Alfonso Policicchio ◽  
Ana-Maria Putz ◽  
Giuseppe Conte ◽  
Sara Stelitano ◽  
Carlo Poselle Bonaventura ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Hydrogen Storage ◽  
Textural Characteristics ◽  
Storage Performance ◽  
Hydrogen Storage Performance
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