First Row Transition Metal Ion-Assisted Ammonia−Borane Hydrolysis for Hydrogen Generation

Abstract

Ammonia-borane (AB) hydrolysis for the generation of hydrogen has been studied using first row transition metal ions, such as Co (2+), Ni (2+), and Cu (2+). In the cases of cobalt- and nickel-assisted AB hydrolysis, amorphous powders are formed that are highly catalytically active for hydrogen generation. Annealing of these amorphous powders followed by powder X-ray diffraction measurements revealed the presence of Co(0) and Co 2B and Ni(0) and Ni 3B, respectively. On the other hand, copper-assisted AB hydrolysis was catalyzed by in situ generated H (+) and Cu(0) nanoparticles. The reduction ability of AB for the realization of coinage metal nanoparticles from the respective metal salts has also been studied. These reduction reactions were found to be facile, affording colloids of pure metal nanoparticles. Nanoparticles prepared in this manner were characterized by UV-visible spectroscopy and high-resolution electron microscopy.

Magnetic RuCo nanoparticles supported on two-dimensional titanium carbide as highly active catalysts for the hydrolysis of ammonia borane

“…Hydrogen is a next-generation fuel that is attractive because it cleanly burns and is thus environment friendly [1]. However the large-scale use of hydrogen is hindered by the difficulty of storing and transporting it in compressed or liquefied form because of its low density [1,2].…”

“…However the large-scale use of hydrogen is hindered by the difficulty of storing and transporting it in compressed or liquefied form because of its low density [1,2]. Thus, finding a safe and efficient storage material is necessary [3].…”

Chemical Synthesis of Metal Nanoparticles Using Amine–Boranes

“…[33] We found that in all the cases, the nanoparticles obtained were quite monodisperse, well separated, and crystalline in nature. Cu, Ag, and Au nanoparticles of average sizes 4.3, 4.7 and 5.1 nm, respectively, were obtained when CuSO 4 ·2 H 2 O, AgNO 3 , and HAuCl 4 ·3 H 2 O were used as metal precursors.…”

Ammonia as a Hydrogen Source for Fuel Cells: A Review

“…Various catalysts with excellent catalytic performance have been developed [52][53][54][55][56][57][58][59][60][61][62][63]. These include noble metal based catalysts such as Pt, Ru, Rh, Pd, Pt and Au supported on alumina; combinations of Pt with Ir, Ru, Co, Cu, Sn, Au and Ni supported on carbon, Rh(0) nano-clusters [52][53][54][55][56][57]; and also non-noble metal based catalysts such as Ni and Co on alumina, and Ni and Co nano-particles, Cu/Cu2O, Poly(N-vinyl-2-pyrrolidone) (PVP) stabilized Ni, NiSiO2 and Fe-Ni alloys [58][59][60][61][62][63]. Unfortunately, most of the aforementioned catalysts, except for the magnetic Fe-Ni alloy catalyst, are difficult to use repeatedly in solution because they are in a powdery form or are supported weakly on a substrate.…”