Abstract
LiNH2 and a pre-processed nanoMgH2 with 1:1 and 2:1 molar ratios were mechano-chemically milled in a high-energy planetary ball mill under inert atmosphere, and at room temperature and atmospheric pressure. Based on the thermogravimetric analysis (TGA) experiments, 2LiNH2-nanoMgH2 demonstrated superior desorption characteristics when compared to the LiNH2-nanoMgH2. The TGA studies also revealed that doping 2LiNH2-nanoMgH2 base material with 2 wt. % nanoNi catalyst enhances the sorption kinetics at lower temperatures. Additional investigation of different catalysts showed improved reaction kinetics (weight percentage of H2 released per minute) of the order TiF3 > nanoNi > nanoTi > nanoCo > nanoFe > multiwall carbon nanotube (MWCNT), and reduction in the on-set decomposition temperatures of the order nanoCo > TiF3 > nanoTi > nanoFe > nanoNi > MWCNT for the base material 2LiNH2-nanoMgH2. Pristine and catalyst-doped 2LiNH2-nanoMgH2 samples were further probed by X-ray diffraction, Fourier transform infrared spectroscopy, transmission and scanning electron microscopies, thermal programmed desorption and pressure-composition-temperature measurements to better understand the improved performance of the catalyst-doped samples, and the results are discussed.
Highlights
The depletion of fossil fuels, especially oil in the near future, rising environmental concerns due to global warming, and the necessity of a secure energy supply have created a worldwide interest in the renewable energy technologies during the last decade
A LiNH2 -MgH2 (1:1) compound was investigated by several researchers, and the results showed considerable NH3 emission, and the revealed reaction mechanism was quite different than the LiNH2 -MgH2 (2:1) compound [13,22,23]
Osborn et al, investigated the low temperature milling, and the results showed that desorption kinetics is faster for the sample milled at
Summary
The depletion of fossil fuels, especially oil in the near future, rising environmental concerns due to global warming, and the necessity of a secure energy supply have created a worldwide interest in the renewable energy technologies during the last decade. Among many forms of alternative energy options, hydrogen has attracted much attention as an energy carrier due to its potential for the replacement of oil in stationary and mobile applications. Viable hydrogen storage technology remains the biggest challenge in the utilization of the hydrogen despite intensive research efforts throughout the world. Solid-state hydrogen storage can be broadly classified into two groups considering the mechanisms involved, namely, physisorption, as in carbon-nanotubes (CNT)/metal organic frameworks (MOFs), and chemisorption, as in metal/complex hydrides. The complex metal hydrides, which have been extensively studied recently, have high volumetric and gravimetric densities, but suffer from high desorption temperatures, reversibility, and sluggish kinetics [1]. Improving the desorption kinetics, reversibility and desorption temperatures of the complex metal hydrides remains a challenge
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