The problem of solid state hydrogen storage

Prìncìpí, G.; Agresti, F.; Maddalena, A.; Russo, S. Lo

doi:10.1016/j.energy.2008.08.027

Cited by 209 publications

(68 citation statements)

References 21 publications

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“…In the search for light-weight hydrogen storage materials, Mg and Mg-based alloys play a prominent role [1][2][3][4][5][6][7]. High volumetric (~110 kgH 2 /m 3 ) and gravimetric capacity (of 7.6 wt%) of MgH 2 , low price and high abundance make magnesium a promising hydrogen storage material [7].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Properties, Hysteresis Behavior and Stress-Strain Analysis of MgH2 Thin Films, Studied over a Wide Temperature Range

2012

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Using hydrogenography, we investigate the thermodynamic parameters and hysteresis behavior in Mg thin films capped by Ta/Pd, in a temperature range from 333 K to 545 K. The enthalpy and entropy of hydride decomposition, ∆H des = −78.3 kJ/molH 2 , ∆S des = −136.1 J/K molH 2 , estimated from the Van't Hoff analysis, are in good agreement with bulk results, while the absorption thermodynamics, ∆H abs = −61.6 kJ/molH 2 , ∆S abs = −110.9 J/K molH 2 , appear to be substantially affected by the clamping of the film to the substrate. The clamping is negligible at high temperatures, T > 523 K, while at lower temperatures, T < 393 K, it is considerable. The hysteresis at room temperature in Mg/Ta/Pd films increases by a factor of 16 as compared to MgH 2 bulk. The hysteresis increases even further in Mg/Pd films, most likely due to the formation of a Mg-Pd alloy at the Mg/Pd interface. The stress-strain analysis of the Mg/Ta/Pd films at 300-333 K proves that the increase of the hysteresis occurs due to additional mechanical work during the (de-)hydrogenation cycle. With a proper temperature correction, our stress-strain analysis quantitatively and qualitatively explains the hysteresis behavior in thin films, as compared to bulk, over the whole temperature range. OPEN ACCESSCrystals 2012, 2 711

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Section: Introductionmentioning

confidence: 99%

Thermodynamic Properties, Hysteresis Behavior and Stress-Strain Analysis of MgH2 Thin Films, Studied over a Wide Temperature Range

2012

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“…Many studies have been reported to focus on further altering the thermodynamics/kinetics of the 2LiNH 2 -MgH 2 system [20][21][22][23]. Doping with high-performance additives exhibits an excellent effect on reducing the temperature for hydrogen uptake and release.…”

Section: N + H 2 ↔ LI 2 Nh + Lih + H 2 ↔ Linh 2 + 2lihmentioning

confidence: 99%

Improved Dehydrogenation Properties of 2LiNH2-MgH2 by Doping with Li3AlH6

Qiu

Wang

et al. 2017

Metals

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Doping with additives in a Li-Mg-N-H system has been regarded as one of the most effective methods of improving hydrogen storage properties. In this paper, we prepared Li 3 AlH 6 and evaluated its effect on the dehydrogenation properties of 2LiNH 2 -MgH 2 . Our studies show that doping with Li 3 AlH 6 could effectively lower the dehydrogenation temperatures and increase the hydrogen content of 2LiNH 2 -MgH 2 . For example, 2LiNH 2 -MgH 2 -0.1Li 3 AlH 6 can desorb 6.43 wt % of hydrogen upon heating to 300 • C, with the onset dehydrogenation temperature at 78 • C. Isothermal dehydrogenation testing indicated that 2LiNH 2 -MgH 2 -0.1Li 3 AlH 6 had superior dehydrogenation kinetics at low temperature. Moreover, the release of byproduct NH 3 was successfully suppressed. Measurement of the thermal diffusivity suggests that the enhanced dehydrogenation properties may be ascribed to the fact that doping with Li 3 AlH 6 could improve the heat transfer for solid-solid reaction.

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“…This work is focussed on hydrogen storage and therefore direct sodium borohydride fuel cells will not be addressed, for more information on this issue reference [1] should be consulted. The application of NaBH 4 as hydrogen storage material for on-board systems was discarded in 2007 when the U.S. Department of Energy gave a no-go decision for this technology; however, this conclusion was only based on specifications for on-board vehicular storage. For other uses, such as portable and niche applications, there are not any specific targets, and several authors believe in the potential of NaBH 4 for these particular applications [2][3][4].…”

Section: Introductionmentioning

confidence: 99%