Ni_1-xPt_x (x = 0−0.12) Hollow Spheres as Catalysts for Hydrogen Generation from Ammonia Borane

Abstract

In this paper, nest-like Ni1-xPtx (x = 0, 0.03, 0.06, 0.09, and 0.12) hollow spheres of submicrometer sizes have been prepared through a template-replacement route and investigated as catalysts for generating hydrogen from ammonia borane (NH3BH3). Experimental investigations have demonstrated that the obtained Ni1-xPtx alloy hollow spheres exhibit favorable catalytic activities for both the hydrolysis and the thermolysis of NH3BH3. It was found that, in the presence of the Ni0.88Pt0.12 catalyst, the hydrolysis of NH3BH3 causes a quick release of H2, while the thermal decomposition of NH3BH3 occurs at lowered temperatures with increased mass loss. The present results indicate that NH3BH3 along with Ni1-xPtx alloy hollow spheres may find some applications for small-scale on-board hydrogen storage and supply.

Hollow Micro‐/Nanostructures: Synthesis and Applications

“…[46] Chen and co-workers prepared Ni 1-x Pt x alloy hollow spheres by chemical reduction of Ni 2þ adsorbed on the surface of poly(styrene-co-methacrylic acid) (PSA) templates and subsequent alloying with Pt via replacement reaction. [47] Mesoporous Fe 3 O 4 hollow spheres have been prepared by chemical adsorption/precipitation of Fe 2þ on carboxyl-functionalized PS templates at 80 8C in the presence of ethylene glycol (EG). [48] In other syntheses, precursor metal cations are first precipitated on the template surface in the form of hydroxide or other intermediate phases through controlled hydrolysis under basic conditions.…”

Carbon-Supported Pt-Based Alloy Electrocatalysts for the Oxygen Reduction Reaction in Polymer Electrolyte Membrane Fuel Cells: Particle Size, Shape, and Composition Manipulation and Their Impact to Activity

“…However, this method was relatively complex, allowing no further electrochemical investigation to evaluate the catalyst's structure and performance. Cheng et al 335 prepared nest-like Ni 1−x Pt x spheres of submicrometer sizes through a template-replacement route in which poly(styrene-co-methacrylic acid) (PSA) was employed as a soft template. The replacement reaction between K 2 PtCl 6 and Ni led to the formation of Ni 1−x Pt x , which was directly deposited onto the surface of the PSA.…”

Hydrogen Releasing of Lithium Amidoborane-LiNH<SUB>2</SUB>BH<SUB>3</SUB>

“…Interestingly, LiAB displays a starting hydrogen-release temperature at 70. 9 C, and a two-step dehydrogenation with peaks centered at 90.5 C and 148.0 C, respectively. In the thermal decomposition process of LiAB, there was no signal of borazine or diborane observed.…”

“…Furthermore, AB has shown a slow thermal kinetics below 100 C and the volatile byproducts such as borazine (HNBH) 3 . 8,9) To solve these problems, recent studies have focused on the alkali and alkaline earth metal amidoboranes (MABs), which are synthesized by the interaction of metal hydride and ammonia borane. MABs can be formed in the solid state reaction of AB with metal hydrides by ball milling [10][11][12][13] or through a wet-chemical route using tetrahydrofuran (THF) as a solvent.…”