Hydrogen-rich boron-containing materials for hydrogen storage
ABSTRACT Hydrogen-rich boron-containing compounds have received extensive attention as potential hydrogen storage media for vehicular applications. The past years have seen significant progresses in material discovery, material composition/structure tailoring, catalyst identification and regeneration chemistry, which give rise to state-of-the-art hydrogen storage materials/technologies. Lithium tetrahydroborate-related materials exhibit the hitherto highest reversible hydrogen capacity via solid-gas reactions. Catalytic hydrolysis of sodium tetrahydroborate offers an on-demand hydrogen generation system for vehicular applications. Ammonia borane-related materials exhibit a satisfactory combination of material properties that are suited for on-board hydrogen sources, coupled with significant advances in spent fuels regeneration. This Perspective discusses the current progresses of these representative reversible or irreversible material systems, aiming at providing an outline of the forefront of hydrogen storage materials/technologies for transportation applications.
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ABSTRACT: The addition of an alkali has been identified as a simple but effective approach for promoting aluminium (Al)/water (H 2 O) reactions. However, the use of alkaline solution causes problems with corrosion of system apparatus. We herein report a novel method that can simultaneously address the Al/H 2 O reaction kinetics and alkali corrosion problems. Our study found that a combined usage of sodium hydroxide (NaOH) and sodium stannate (Na 2 SnO 3) can dramatically improve the hydrogen generation kinetics of the Al–H 2 O system. Furthermore, the addition of a small amount of Na 2 SnO 3 causes a remarkable decrease of NaOH concentration, which is required for achieving favorable system performance. The factors influencing the hydrogen generation performance of the system were investigated. In the preliminary mechanistic study, the solid samples that were collected at different reaction stages were examined by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. Our study showed that the most likely mechanism for the promoting effect of Na 2 SnO 3 is the in situ deposition of metallic Sn particles on the Al surface, which act as local inhibitors of the repassivation of Al.Energy & Environmental Science 06/2011; 4(6). DOI:10.1039/c1ee00014d · 15.49 Impact Factor
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ABSTRACT: Destabilized by aluminum hydride, the dehydrogenation properties of ammonia borane (AB) can be improved significantly, including enhanced dehydrogenation kinetics, reduced induction period and suppressed formation of volatile byproducts. Furthermore, a lowered dehydrogenation temperature was also achieved for AlH3, indicating a mutual dehydrogenation enhancement for both AB and AlH3 in this mixture. The destabilized sample, 3AB/AlH3,can totally release more than 12 wt% of high-pure hydrogen (>99 wt%) without any detectable by-products below 250 °C. Mechanism investigations indicated that the mutual dehydrogenation enhancement in the mixture is attributed to the Coulombic attraction between the hydridic Hδ− in AlH3 and the protonic Hδ+ in the NH3 group of AB.International Journal of Hydrogen Energy 01/2015; 414. DOI:10.1016/j.ijhydene.2014.11.065 · 2.93 Impact Factor
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ABSTRACT: The catalyst with high activity, 100% selectivity and good durability is highly desirable in developing a hydrous hydrazine-based hydrogen generation system. Herein we report the synthesis of nickel-platinum (Ni-Pt) bimetallic nanoparticles supported on mesoporous alumina (MA) using a simple one-pot evaporation-induced self-assembly method. The Ni-Pt/MA catalyst exhibits excellent activity and satisfactory stability for selectively catalyzing the decomposition of hydrous hydrazine to generate hydrogen at mild temperatures, which compares favorably with the performance of the catalysts developed to date. The facile synthesis of high-performance and cost-effective Ni-based catalyst is of clear significance for the development of hydrous hydrazine as a viable hydrogen carrier.Journal of Power Sources 01/2015; 273:554–560. DOI:10.1016/j.jpowsour.2014.09.119 · 5.21 Impact Factor