Abstract

We have investigated the complex metal hydrides involving light weight elements or compounds for the reversible hydrogen storage. The complex hydrides are prepared via an inexpensive solid state mechanochemical process under reactive atmosphere at ambient temperatures. The complex metal hydride, LiBH4 with different mole concentrations of ZnCl2 were characterized for the new phase formation and hydrogen decomposition characteristics of Zn(BH4)2. Furthermore, the complex metal hydride is destabilized using the addition of nano MgH2 for the reversible hydrogen storage characteristics. The structural, microstructural, surface, and other physicochemical behaviors of these lightweight complex metal hydrides have been studied via various metrological tools such as x-ray diffraction, Fourier transform infrared spectroscopy, thermal programed desorption, and PCT hydrogen absorption methods.

Highlights

  • Complex metal hydrides are basically composed of various light weight elements and compounds that bonded with the hydrogen atom in binary, ternary, or quaternary structures [1–3]

  • Further to decrease the temperature of hydrogen sorption can be facilitated by destabilizing via introducing alkaline metal hydrides, to form a quaternary structure, for example, LaMg2NiH7 [8] or LiMg2RuH7 [9]

  • Two different sets of complex metal hydrides have been studied in this work, one is with the mixture, 2LiBH4 + ZnCl2 with different catalysts and the other set related to destabilized materials LiBH4+ 1⁄2MgH2 + Xmol% ZnCl2 with different catalysts

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Summary

Introduction

Complex metal hydrides are basically composed of various light weight elements and compounds that bonded with the hydrogen atom in binary, ternary, or quaternary structures [1–3]. The binary hydrides are made of light-weight elements and compounds, for example, LiH and MgH2 often releases the absorbed hydrogen at very high temperatures (>400°C) and are irreversible in nature [4, 5]. MgH2 on the other hand, has a comparative hydrogen storage capacity of ~7.6 wt.%, at temperatures >325°C, the slow kinetics of reaction makes this metal hydride not usable for potential applications [5]. Keeping the aforementioned metal hydrides and its salient characteristics, we have successfully synthesized new complex hydrides with combinations of LiBH4 and MgH2 for the formation of Zn substituted systems and catalysts assisted complex metal hydrides for reversible hydrogen storage and for vehicular on-board applications

Experimental details
Results and discussion
Complex metal hydride - 2LiBH4 + ZnCl2 without and with different catalysts
Conclusion
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