By integrating redox self-assembly and redox etching processes, we report a general one-pot strategy for the synthesis of Au@multi-M O (M = Co, Ce, Fe, and Sn) yolk@shell nanospheres. Without any additional protecting molecule or reductant, the whole reaction is a clean redox process that happens among the inorganic metal salts in an alkaline aqueous solution. By using this method, Au@CoO/CeO (Au@Co-Ce), Au@CoO/FeO (Au@Co-Fe), and Au@CeO/SnO (Au@Ce-Sn) yolk@shell nanospheres with binary oxides as shells, Au@CoO/CeO/FeO (Au@Co-Ce-Fe) yolk@shell nanospheres with ternary oxides as shells and Au@CoO/CeO/FeO/SnO (Au@Co-Ce-Fe-Sn) yolk@shell nanospheres with quaternary oxides as shells can be obtained. Subsequently, the catalytic CO oxidation was selected as the catalytic model, and the Au@Co-Ce system was chosen as the catalyst. It was found that the catalytic activity of Au@Co-Ce yolk@shell nanospheres can be optimized by altering the relative proportion of Co and Ce oxides.
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| http://dx.doi.org/10.1039/c8sc01520a | DOI Listing |
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