FT-IR spectra of inorganic borohydrides

D’Anna, Vincenza; Spyratou, Alexandra; Sharma, Manish; Hagemann, Hans‐Rudolf

doi:10.1016/j.saa.2014.02.130

Cited by 87 publications

(83 citation statements)

References 41 publications

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“…Infrared spectroscopy (FTIR) data of bulk LiBH 4 and Ca (BH 4 ) 2 (see Figure 5) both demonstrate three characteristic B-H stretching modes, in the range of 2000-2500 cm À 1 , as well as B-H bending bands at 1093, 1240 and 1294 cm À 1 in LiBH 4 and two signals at 1130 and 1261 cm À 1 for that of Ca (BH 4 ) 2 , in accord with reference spectra [34,35]. The bulk eutectic LiBH 4 -Ca(BH 4 ) 2 mixture evidently exhibits a combination of the previously mentioned B-H bending and stretching bands (green spectra), however after nanoconfinement, these signals are significantly reduced due to the presence of the carbon scaffold (blue spectra).…”

Section: Cyclic Stability During Hydrogen Release and Uptakesupporting

confidence: 76%

Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2

et al. 2015

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Section: Cyclic Stability During Hydrogen Release and Uptakesupporting

confidence: 76%

Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2

et al. 2015

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“…These results were consistent with the results of XRD. However, new IR absorption peak was clearly observed around 2300 cm −1 after heating up to 183 • C and 300 • C. Also, another new peak appeared around 1100 cm −1 after heating up to 300 • C. Although these peaks were not identified in this work, the peak positions were similar to those of LiBH 4 [23], suggesting a such kind of Li-B-H phase exist after heating up to 183 • C and/or 300 • C. The unknown peak around 2300 cm −1 was also observed for the IR spectra of the composite consisting of BN nano H x (ball-milled h-BN under 1.0 MPa H 2 for 80 h) and LiH [24]. Thus, the formation of new H-containing solid compound could result in the slightly low hydrogen desorption amount in Figure 2.…”

Section: Resultsmentioning

confidence: 49%

“…Also, another new peak appeared around 1100 cm −1 after heating up to 300 °C. Although these peaks were not identified in this work, the peak positions were similar to those of LiBH4 [23], suggesting a such kind of Li-B-H phase exist after heating up to 183 °C and/or 300 °C. The unknown peak around 2300 cm −1 was also observed for the IR spectra of the composite consisting of BN nano Hx (ball-milled h-BN under 1.0 MPa H2 for 80 h) and LiH [24].…”

Section: Resultsmentioning

confidence: 63%

Unique Hydrogen Desorption Properties of LiAlH4/h-BN Composites

et al. 2017

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Hexagonal boron nitride (h-BN) is known as an effective additive to improve the hydrogen de/absorption properties of hydrogen storage materials consisting of light elements. Herein, we report the unique hydrogen desorption properties of LiAlH 4 /h-BN composites, which were prepared by ball-milling. The desorption profiles of the composite indicated the decrease of melting temperature of LiAlH 4 , the delay of desorption kinetics in the first step, and the enhancement of the kinetics in the second step, compared with milled LiAlH 4 . Li 3 AlH 6 was also formed in the composite after desorption in the first step, suggesting h-BN would have a catalytic effect on the desorption kinetics of Li 3 AlH 6 . Finally, the role of h-BN on the desorption process of LiAlH 4 was discussed by comparison with the desorption properties of LiAlH 4 /X (X = graphite, LiCl and LiI) composites, suggesting the enhancement of Li ion mobility in the LiAlH 4 /h-BN composite.

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“…Thus FT-IR was performed to check the "survival" of LiBH 4 after ball-milling. Borohydrides present two regions of interest B-H bending (1000-1600 cm −1 ) and H-B-H stretching (2000-2500 cm −1 ) [29,30]. Both IR active modes are presented in all the as-milled samples (Supplementary Materials), indicating sufficient thermal stability during ball milling.…”

Section: Characterization Of As-milled Materialsmentioning

confidence: 93%

Dehydrogenation of Surface-Oxidized Mixtures of 2LiBH4 + Al/Additives (TiF3 or CeO2)

2017

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Abstract:Research for suitable hydrogen storage materials is an important ongoing subject. LiBH 4 -Al mixtures could be attractive; however, several issues must be solved. Here, the dehydrogenation reactions of surface-oxidized 2LiBH 4 + Al mixtures plus an additive (TiF 3 or CeO 2 ) at two different pressures are presented. The mixtures were produced by mechanical milling and handled under welding-grade argon. The dehydrogenation reactions were studied by means of temperature programmed desorption (TPD) at 400 • C and at 3 or 5 bar initial hydrogen pressure. The milled and dehydrogenated materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transformed infrared spectroscopy (FT-IR) The additives and the surface oxidation, promoted by the impurities in the welding-grade argon, induced a reduction in the dehydrogenation temperature and an increase in the reaction kinetics, as compared to pure (reported) LiBH 4 . The dehydrogenation reactions were observed to take place in two main steps, with onsets at 100 • C and 200-300 • C. The maximum released hydrogen was 9.3 wt % in the 2LiBH 4 + Al/TiF 3 material, and 7.9 wt % in the 2LiBH 4 + Al/CeO 2 material. Formation of CeB 6 after dehydrogenation of 2LiBH 4 + Al/CeO 2 was confirmed.

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FT-IR spectra of inorganic borohydrides

Cited by 87 publications

References 41 publications

Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2

Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2

Unique Hydrogen Desorption Properties of LiAlH4/h-BN Composites

Dehydrogenation of Surface-Oxidized Mixtures of 2LiBH4 + Al/Additives (TiF3 or CeO2)

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