Hydrazine borane: synthesis, characterization, and application prospects in chemical hydrogen storage

Abstract

Hydrazine borane (N(2)H(4)BH(3)) is the novel boron- and nitrogen-based material appearing to be a promising candidate in chemical hydrogen storage. It stores 15.4 wt% of hydrogen in hydridic and protic forms, and the challenge is to release H(2) with maximum efficiency, if possible all hydrogen stored in the material. An important step to realize this ambitious goal is to synthesize HB with high yields and high purity, and to characterize it fully. In this work, we report a 2-step synthesis (salt metathesis and solvent extraction-drying) through which N(2)H(4)BH(3) is successfully obtained in 3 days, with a yield of about 80% and a purity of 99.6%. N(2)H(4)BH(3) was characterized by NMR, IR, XRD, TGA and DSC, its stability in dioxane and water was determined, and its thermolysis by-products were characterized. We thus present a complete data sheet that should be very useful for future studies. Furthermore, we propose a discussion on the potential of HB (with H(2) released by either thermolysis or hydrolysis) in chemical hydrogen storage.

Effects of Pd Nanoparticle Size and Solution Reducer Strength on Pd/C Electrocatalyst Stability in Alkaline Electrolyte

“…The effect of the palladium particles size on the stability has been analyzed using two commercial catalysts exhibiting different nanoparticle size distributions. Moreover, to mimic the utilization of palladium catalysts closer to real operation in DLAFC anodes, the stability of the Pd/C catalysts has been also studied in the presence of strong reducer in solution: firstly in presence of hydrogen and secondly with the addition of hydrazine borane, 42 which is a very strong reducing agent.…”

Thermogravimetric analysis-based screening of metal (II) chlorides as dopants for the destabilization of solid-state hydrazine borane

“…7 Of purity >99%, it is stored and handled in an argon-filled glove box (MBraun M200B) where the oxygen and water con- MCl 2 in equimolar amounts or at the targeted mole percentages were weighed, mixed/ground gently together in a mortar, and then stored in a vial for quite-immediate use. The second step consisted of adding the asprepared mixture to hydrazine borane: the former was first weighed, followed by the second one, and then mixed/ground gently together in a mortar; 18 finally, the freshly prepared mixture was loaded into the TGA crucible for analysis.…”

“…9 More recently, it was suggested to be a possible candidate for chemical hydrogen storage, 10 provided it is not used in pristine state. 7 Indeed, better dehydrogenation performance, in terms of onset temperature of reaction and release of unwanted gaseous side-products, can be obtained by adding a destabilizing agent (e.g., LiH, LiBH 4 , NH 3 BH 3 ), 11−13 or by chemically modifying the borane to form hydrazinidoborane derivatives (e.g., LiN 2 H 3 BH 3 , NaN 2 H 3 BH 3 , KN 2 H 3 BH 3 ). 14−16 Improved dehydrogenation performance could be also achieved with other destabilizing agents, for instance, metal chlorides.…”

Hydrolysis of Hydrazine Borane for Chemical Hydrogen Storage by Highly Efficient Poly(N-vinyl-2-pyrrolidone)-protected Rhodium Nanoparticles

“…Hydrazine borane (N 2 H 4 BH 3 ) was synthesized from the reaction of hydrazine hemisulfate with sodium borohydride in 1,4-dioxane following the literature procedures [20,21] [21].…”