Potassium‐Modified Mg(NH<sub>2</sub>)<sub>2</sub>/2 LiH System for Hydrogen Storage

Wang, Jianhui; Liu, Tao; Wu, Guotao; Li, Wen; Liu, Yongfeng; Araújo, C. Moysés; Blomqvist, Andreas; Ahuja, Rajeev; Xiong, Zhitao; Yang, Dao‐Wu; Gao, Mingxia; Pan, Hongge; Chen, Ping

doi:10.1002/anie.200805264

Cited by 183 publications

(164 citation statements)

References 18 publications

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“…For the 2LiNH2-MgH2-0.1Li3AlH6 sample, three dehydrogenation peaks were seen at temperatures of 96, 128, and 180 °C, respectively. A reduction of 52 °C in the first dehydrogenation peak was achieved as compared to the pristine sample of 2LiNH2-MgH2 [32]. MS examination shows that 2LiNH2-MgH2 generated gaseous products including hydrogen and ammonia in a wide heating process.…”

Section: Resultsmentioning

confidence: 87%

“…Interestingly, the dehydrogenation process of the samples with X = 0.05-0.20 exhibited three peaks, which is different from the pristine sample, with only one desorption peak at 184 • C. For the 2LiNH 2 -MgH 2 -0.1Li 3 AlH 6 sample, three dehydrogenation peaks were seen at temperatures of 96, 128, and 180 • C, respectively. A reduction of 52 • C in the first dehydrogenation peak was achieved as compared to the pristine sample of 2LiNH 2 -MgH 2 [32]. MS examination shows that 2LiNH 2 -MgH 2 generated gaseous products including hydrogen and ammonia in a wide heating process.…”

Section: Structural Characterization and Property Evaluationmentioning

confidence: 85%

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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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Section: Resultsmentioning

confidence: 87%

Section: Structural Characterization and Property Evaluationmentioning

confidence: 85%

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

Qiu

Wang

et al. 2017

Metals

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show abstract

“…%. Further efforts have been devoted to the kinetic improvement of the Mg(NH 2 ) 2 + 2LiH system by using catalysts or additives [89][90][91][92][93][94]. Wang et al [91] proposed graphite-supported Ru nanoparticles as efficient additive in the Mg(NH 2 ) 2 + 2LiH system: after mixing, a considerable enhancement in the ab/dehydrogenation kinetics for more than 10 cycles have been observed.…”

Section: Li-mg-n-h Systemmentioning

confidence: 99%

“…Significant improvements, in terms of sorption properties and ammonia suppression were achieved by Chen et al in 2008, either adding LiBH 4 or by partially replacing LiH with KH [93,96]. The composite Mg(NH 2 ) 2 + 2LiH + 0.1LiBH 4 can desorb and fully re-absorb 5 wt.…”

Section: Li-mg-n-h Systemmentioning

confidence: 99%

Recent Progress and New Perspectives on Metal Amide and Imide Systems for Solid-State Hydrogen Storage

et al. 2018

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Hydrogen storage in the solid state represents one of the most attractive and challenging ways to supply hydrogen to a proton exchange membrane (PEM) fuel cell. Although in the last 15 years a large variety of material systems have been identified as possible candidates for storing hydrogen, further efforts have to be made in the development of systems which meet the strict targets of the Fuel Cells and Hydrogen Joint Undertaking (FCH JU) and U.S. Department of Energy (DOE). Recent projections indicate that a system possessing: (i) an ideal enthalpy in the range of 20-50 kJ/mol H 2 , to use the heat produced by PEM fuel cell for providing the energy necessary for desorption; (ii) a gravimetric hydrogen density of 5 wt. % H 2 and (iii) fast sorption kinetics below 110 • C is strongly recommended. Among the known hydrogen storage materials, amide and imide-based mixtures represent the most promising class of compounds for on-board applications; however, some barriers still have to be overcome before considering this class of material mature for real applications. In this review, the most relevant progresses made in the recent years as well as the kinetic and thermodynamic properties, experimentally measured for the most promising systems, are reported and properly discussed.

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“…The catalyzing effect can be identified when KH is doped which also provides similar thermodynamic improvements [74]. However, it is worthwhile to note that the appropriate proportion between individual components should be made to avoid ammonia releasing during the dehydrogenation process.…”

Section: Hybridizationmentioning

confidence: 99%