scholarly journals In Situ Formation of TiB2 Nanoparticles for Enhanced Dehydrogenation/Hydrogenation Reaction Kinetics of LiBH4–MgH2 as a Reversible Solid-State Hydrogen Storage Composite System

2018 ◽  
Vol 122 (22) ◽  
pp. 11671-11681 ◽  
Author(s):  
Fahim Karimi ◽  
María V. C. Riglos ◽  
Antonio Santoru ◽  
Armin Hoell ◽  
Vikram S. Raghuwanshi ◽  
...  
2021 ◽  
Vol 411 ◽  
pp. 128534
Author(s):  
Jianli Wang ◽  
Zhao Zhang ◽  
Hangjun Ying ◽  
Gaorong Han ◽  
Wei-Qiang Han

2020 ◽  
Vol 157 ◽  
pp. 828-839 ◽  
Author(s):  
Hui Yong ◽  
Shihai Guo ◽  
Zeming Yuan ◽  
Yan Qi ◽  
Dongliang Zhao ◽  
...  

2014 ◽  
Vol 47 (1) ◽  
pp. 67-75 ◽  
Author(s):  
Fahim Karimi ◽  
P. Klaus Pranzas ◽  
Armin Hoell ◽  
Ulla Vainio ◽  
Edmund Welter ◽  
...  

Owing to a theoretical hydrogen storage capacity of 10.5 wt% H2, Ca(BH4)2+MgH2, the so-called calcium reactive hydride composite (Ca-RHC), has a great potential as a hydrogen storage material. However, its dehydrogenation temperature (∼623 K) is too high for any mobile applications. By addition of 10 mol% of NbF5into Ca(BH4)2+MgH2, a decrease of the dehydrogenation onset temperature by ∼120 K is observed. In order to understand the reasons behind this desorption temperature decrement two sets of samples [Ca(BH4)2+MgH2and Ca(BH4)2+MgH2+0.1NbF5] in different hydrogenation states, were prepared. The structural investigation of the above mentioned sets of samples by means of volumetric measurements, anomalous small-angle X-ray scattering (ASAXS) and X-ray absorption spectroscopy (XAS) is reported here. The XAS results show that after the milling procedure NbB2is formed and remains stable upon further de/rehydrogenation cycling. The results of Nb ASAXS point to nanometric spherical NbB2particles distributed in the hydride matrix, with a mean diameter of ∼10 nm. Results from Ca ASAXS indicate Ca-containing nanostructures in the Ca-RHC+0.1NbF5samples to be ∼50% finer compared to those without additive. Thus, a higher reaction surface area and shorter diffusion paths for the constituents are concluded to be important contributions to the catalytic effect of an NbF5additive on the hydrogen sorption kinetics of the Ca(BH4)2+MgH2composite system.


2019 ◽  
Vol 4 (7) ◽  
pp. 1650-1657 ◽  
Author(s):  
Lilu Liu ◽  
Xingguo Qi ◽  
Shijun Yin ◽  
Qiangqiang Zhang ◽  
Xiaozhi Liu ◽  
...  

2010 ◽  
Vol 71 (3) ◽  
pp. 323-328 ◽  
Author(s):  
Syed Arshad Hussain ◽  
Md N. Islam ◽  
D. Bhattacharjee

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