Abstract
In order to improve the dehydrogenation properties of the Li-B-N-H system, a flower-like NiO was successfully synthesized using the hydrothermal method. The effect of the NiO on the dehydrogenation properties of the LiBH4-2LiNH2 system was studied. The results showed that the dehydrogenation properties of the LiBH4-2LiMH2 system were significantly enhanced by doping with NiO. The composite doped with 5 wt. % NiO exhibited optimal hydrogen storage properties. It released about 10.5 wt. % hydrogen below 300 °C, and the onset dehydrogenation temperature was only 90 °C, 110 °C lower than that of LiBH4-2LiNH2. The isothermal dehydrogenation experiment indicated that the LiBH4-2LiNH2-5 wt. % NiO composite released 8.8 wt. % hydrogen within 15 min at 150 °C. Structural analysis revealed that the as-prepared NiO was reduced to metallic Ni, which worked as an active catalytic species in the remainder of the dehydrogenation process. The Mass Spectrometer (MS) analyses showed that the doped NiO inhibited the content of NH3 released in the process of the dehydrogenation of LiBH4-2LiNH2-NiO.
Highlights
In recent years, solid-state complex hydrides bearing lightweight elements or compounds, such as sodium aluminum hydrides, lithium aluminum hydrides, lithium borohydrides, and lithium amides—have been proven to be potential candidates for hydrogen storage [1,2,3]
A flower-like NiO additive has been synthesized via a hydrothermal process, and doped into the LiBH4 -2LiNH2 system in order to improve the hydrogen storage properties
The results indicated that by doping a small amount of NiO, the onset temperature of the
Summary
Solid-state complex hydrides bearing lightweight elements or compounds, such as sodium aluminum hydrides, lithium aluminum hydrides, lithium borohydrides, and lithium amides—have been proven to be potential candidates for hydrogen storage [1,2,3] Amongst these hydrides, LiBH4 holds the maximum hydrogen capacity of 18.4 wt. %. high thermodynamic stability and poor reversibility limit its practical application as an onboard hydrogen storage medium [4,5]. High thermodynamic stability and poor reversibility limit its practical application as an onboard hydrogen storage medium [4,5] To overcome these problems, several attempts have been explored, including destabilization [6,7], catalyst additives [8,9,10], and partial anion–cation substitution [11,12]. With the addition of 25 wt. % Ni, the dehydrogenation peak temperature of LiBH4 was reduced from 470 to 423 ◦ C, and the dehydrogenation content of LiBH4 was raised from 4.3 to 10.8 wt. %
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
