Abstract
Hollow metallic nickel spheres with an average diameter of 1.8 μm have been successfully synthesized via a decomposition and reduction route by using hollow nickel hydroxide spheres as precursor. Microsized hollow bimetallic (Ni/Au, Ni/Ag, Ni/Pt, and Ni/Pd) and noble metal (Pt and Pd) spheres have also been selectively synthesized by adjusting the amount of reactants of replacement reaction in which corresponding noble metal compound and hollow metallic nickel spheres were used as starting materials. The magnetic properties of hollow metallic nickel spheres have been investigated. It is found that the coercivity of hollow Ni spheres is much enhanced compared with their bulk counterparts. The study on catalytic activities of the as-prepared hollow noble metal spheres for hydrogen generation reveals that Ni/Pt hollow bimetallic spheres exhibit favorable catalytic activities which have potential applications in portable hydrogen generation systems.
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