Abstract
Co-B catalysts are promising candidates for hydrogen evolution via hydrolysis of alkaline sodium borohydride (NaBH4) solutions. In the present paper, a sonochemical approach was investigated for synthesis of Co-B catalysts and hydrolysis of alkaline NaBH4solutions. Sonochemical application on synthesizing process improved the intrinsic and extrinsic properties of Co-B catalysts such as crystal, spectral, surface area, pore volume, pore diameter, and particle size. Co-B catalysts prepared by sonochemical approach possessed smaller particle size, higher surface area, and higher pore volume than the Co-B catalysts prepared by coprecipitation synthesis. The effects of sonochemical process on hydrolysis of alkaline NaBH4solutions were investigated by Arrhenius theory. It was clearly demonstrated that the advantages of alkaline NaBH4solution sonohydrolysis provide superficial effects on hydrogen evolution kinetic as maximum H2generation rate (HGR) and minimum activation energy (Ea).
Highlights
NaBH4 as a solid state hydrogen storage material for on-board hydrogen generation systems has drawn much attention due to its superficial properties as it is non-flable, nontoxic, selective, environmentally friendly, and one of the light weight complex hydrides with high hydrogen capacity (11 wt.%) [1,2,3].NaBH4 is self-decomposable in aqueous solutions and can be stabilized by alkalization [2, 4]
cobalt-boron alloy (Co-B) catalysts were synthesized via two different systems (Figure 1(a))
The CoB-1 catalyst was synthesized with sonochemical approach and CoB-2, which used as control sample, was synthesized by magnetic stirring system
Summary
NaBH4 as a solid state hydrogen storage material for on-board hydrogen generation systems has drawn much attention due to its superficial properties as it is non-flable, nontoxic, selective, environmentally friendly, and one of the light weight complex hydrides with high hydrogen capacity (11 wt.%) [1,2,3].NaBH4 is self-decomposable in aqueous solutions and can be stabilized by alkalization [2, 4]. NaBH4 as a solid state hydrogen storage material for on-board hydrogen generation systems has drawn much attention due to its superficial properties as it is non-flable, nontoxic, selective, environmentally friendly, and one of the light weight complex hydrides with high hydrogen capacity (11 wt.%) [1,2,3]. Hydrogen generation from NaBH4 is supplied for fuel cells by means of alkaline solution hydrolysis in contact with certain catalysts. Nonnoble metals have attracted significant attention in turns of both reactivity and costs. Among different nonnoble catalysts such as Co, Ni, Cu, and Fe catalysts could be used for hydrolysis reactions of alkaline NaBH4 solutions from the view point of low cost, stability, crystallinity, and high activity [4,5,6,7,8]
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