Pt@CeO₂ multicore@shell self-assembled nanospheres: Clean synthesis, structure optimization, and catalytic applications

A clean nonorganic synthetic method has been developed to fabricate the uniform pomegranate-like Pt@CeO₂ multicore@shell nanospheres in a large scale. Under the effective protection of Ar atmosphere the redox reaction just simply happened between Ce(NO₃)₃ and K ₂PtCl₄ in an alkaline aqueous solution, in which no other reducing agents or surfactants were added. The as-obtained nanospheres exhibited excellent structure stability even being calcined at 600 C for 5 h. Moreover, the as-obtained Pt@CeO₂ multicore@shell nanospheres can be further supported on reduced graphene oxide (RGO) to form heterogeneous nanocatalyst, which has been successfully applied in the chemical reduction reaction of nitrophenol (NP) by ammonia borane (NH₃BH₃, dubbed as AB) instead of hazardous H₂ or NaBH₄.