Formation Process of [B&lt;SUB&gt;12&lt;/SUB&gt;H&lt;SUB&gt;12&lt;/SUB&gt;]&lt;SUP&gt;2&amp;minus;&lt;/SUP&gt; from [BH&lt;SUB&gt;4&lt;/SUB&gt;]&lt;SUP&gt;&amp;minus;&lt;/SUP&gt; during the Dehydrogenation Reaction of Mg(BH&lt;SUB&gt;4&lt;/SUB&gt;)&lt;SUB&gt;2&lt;/SUB&gt;

Yan, Yigang; Li, Haiwen; Maekawa, Hideki; Aoki, Masakazu; Noritake, Tatsuo; Matsumoto, Mitsuru; Miwa, Kenji; Towata, Shin‐ichi; Orimo, Shin Ichi

doi:10.2320/matertrans.ma201002

Cited by 33 publications

(27 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the temperature is increased to 475 °C, no obvious changes of diffraction peaks, Raman spectra and the major resonance at −15.4 ppm attributed to K2B12H12 are seen. The resonance originated from residual KBH4 (−38.2 ppm in solid-state and −35.6 ppm in solution-state 11 B NMR) disappears when the temperature is increased to 550 °C, whereas no obvious changes of diffraction peaks, Raman spectra and the major resonance attributed to K2B12H12 are observed. This suggests that the weight loss bellow 550 °C is responsible for the dehydrogenation of residual KBH4.…”

Section: Decomposition Of Anhydrous LImentioning

confidence: 96%

“…increased to 700 °C, the dehydrogenation amount reaches 5.1 mass%, the major resonance of Li2B12H12 at −15.3 ppm in 11 B MAS NMR shifts to −11.9 ppm, and that at 1.4 ppm in 1 H MAS NMR changes to several weak resonance peaks from −10 ppm to 10 ppm. This suggests that Li2B12H12−x continuously releases hydrogen accompanied by the polymerization of the icosahedral B12 skeletons and the formation of (Li2B12Hz)n polymers [15,21,29], insoluble in water and DMSO.…”

Section: Decomposition Of Anhydrous LImentioning

confidence: 97%

“…The decomposition behavior of anhydrous K2B12H12 is different from that formed as a dehydrogenation intermediate of KBH4 predicted by theoretical calculation [34], suggesting that the coexisting KH may facilitate the decomposition of K2B12H12. When the temperature is increased to 700 °C, the diffraction peaks and Raman spectra from K2B12H12 are hardly observed, the main resonance at −15.4 ppm in 11 B MAS NMR decreases significantly without any change in the chemical shift and a broad resonance between −12.2 ppm and −14.2 ppm appears. It suggests that the major dehydrogenation of K2B12H12 to K2B12H12−x and the polymerization of K2B12H12−x to (K2B12Hz)n polymers start to happen at 700 °C [21], similar to those of Na2B12H12.…”

Section: Decomposition Of Anhydrous LImentioning

confidence: 99%

“…Metal dodecaborates M 2/n B 12 H 12 (n is the valence of M) have been widely regarded as a dehydrogenation intermediate of metal borohydrides M(BH 4 ) n with a high gravimetric hydrogen density of 10 mass% [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The formation of M 2/n B 12 H 12 , despite is still controversial, largely depends on the dehydrogenation temperature, hydrogen backpressure, particle size and sample pretreatment [11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…The formation of M 2/n B 12 H 12 , despite is still controversial, largely depends on the dehydrogenation temperature, hydrogen backpressure, particle size and sample pretreatment [11][12][13][14][15][16][17][18][19][20][21]. Due to the strong B-B bonds in an icosahedral boron cage B 12 , the intermediate comprising of polyatomic anion [B 12 H 12 ] 2´h as been widely regarded at the main obstacle for the rehydrogenation of M(BH 4 ) n [5,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Thermal Decomposition of Anhydrous Alkali Metal Dodecaborates M2B12H12 (M = Li, Na, K)

Akiba

2015

Energies

Self Cite

View full text Add to dashboard Cite

Metal dodecaborates M 2/n B 12 H 12 are regarded as the dehydrogenation intermediates of metal borohydrides M(BH 4 ) n that are expected to be high density hydrogen storage materials. In this work, thermal decomposition processes of anhydrous alkali metal dodecaborates M 2 B 12 H 12 (M = Li, Na, K) synthesized by sintering of MBH 4 (M = Li, Na, K) and B 10 H 14 have been systematically investigated in order to understand its role in the dehydrogenation of M(BH 4 ) n . Thermal decomposition of M 2 B 12 H 12 indicates multistep pathways accompanying the formation of H-deficient monomers M 2 B 12 H 12´x containing the icosahedral B 12 skeletons and is followed by the formation of (M 2 B 12 H z ) n polymers. The decomposition behaviors are different with the in situ formed M 2 B 12 H 12 during the dehydrogenation of metal borohydrides.

show abstract

Section: Decomposition Of Anhydrous LImentioning

confidence: 96%

Section: Decomposition Of Anhydrous LImentioning

confidence: 97%

Section: Decomposition Of Anhydrous LImentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thermal Decomposition of Anhydrous Alkali Metal Dodecaborates M2B12H12 (M = Li, Na, K)

Akiba

2015

Energies

Self Cite

View full text Add to dashboard Cite

show abstract

Inducing One‐Step Dehydrogenation of Magnesium Borohydride via Confinement in Robust Dodecahedral Nitrogen‐Doped Porous Carbon Scaffold

Jia,

Han,

Wang

et al. 2024

Advanced Materials

View full text Add to dashboard Cite

A dodecahedral activated N‐doped porous carbon scaffold is synthesized and used for the nanoconfinement of Mg(BH4)2. The optimized mesoporous scaffold possesses an accumulated pore width of 2.65 nm, high specific surface area (3955.9 m2 g−1), and large pore volume (2.15 cm3 g−1), providing ample space for the confinement of Mg(BH4)2 particles and numerous surface active sites for interactions with the same. The confined Mg(BH4)2 system features a dehydrogenation onset temperature of 81.5 °C, an extremely high capacity of 10.2 wt% H2, and an almost single‐step dehydrogenation profile. Moreover, the system exhibits superior capacity retention of 82.7% after 20 cycles at a moderate temperature of 250 °C. Precise activation control enables a transformation from microporous carbon materials to mesoporous ones, and hence the efficient nanoconfinement of Mg(BH4)2 and realization of one‐step dehydrogenation. The evolution of borohydride intermediates is systematically revealed throughout the cycling process. Density functional theory calculations demonstrate defective N heteroatoms within the scaffold are vital in reducing the strength of B─H bonds, and the N‐doped carbon can facilitate decomposition of the irreversible MgB12H12 intermediate. This study opens up new avenues for designing robust carbon scaffolds doped with heteroatoms and analyzing intermediate evolution in nanoconfined Mg‐based borohydride systems.

show abstract

Solid Hydrogen Storage Materials: Non-interstitial Hydrides

et al. 2016

Green Energy and Technology

View full text Add to dashboard Cite

Formation Process of [B<SUB>12</SUB>H<SUB>12</SUB>]<SUP>2−</SUP> from [BH<SUB>4</SUB>]<SUP>−</SUP> during the Dehydrogenation Reaction of Mg(BH<SUB>4</SUB>)<SUB>2</SUB>

Cited by 33 publications

References 18 publications

Thermal Decomposition of Anhydrous Alkali Metal Dodecaborates M2B12H12 (M = Li, Na, K)

Thermal Decomposition of Anhydrous Alkali Metal Dodecaborates M2B12H12 (M = Li, Na, K)

Inducing One‐Step Dehydrogenation of Magnesium Borohydride via Confinement in Robust Dodecahedral Nitrogen‐Doped Porous Carbon Scaffold

Solid Hydrogen Storage Materials: Non-interstitial Hydrides

Contact Info

Product

Resources

About