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A galvanic replacement strategy has been successfully adopted to design Ag  x  Au 1- x  @CeO 2 core@shell nanospheres derived from Ag@CeO 2 ones. After etching using HAuCl 4 , the Ag core was in situ replaced with Ag  x  Au 1- x  alloy nanoframes, and void spaces were left under the CeO 2 shell. Among the as-prepared Ag  x  Au 1- x  @CeO 2 catalysts, Ag 0.64 Au 0.36 @CeO 2 shows the optimal catalytic performance, whose catalytic efficiency reaches even 2.5 times higher than our previously reported Pt@CeO 2 nanospheres in the catalytic reduction of 4-nitrophenol (4-NP) by ammonia borane (AB). Besides, Ag 0.64 Au 0.36 @CeO 2 also exhibits a much lower 100% conversion temperature of 120 °C for catalytic CO oxidation compared with the other samples.

chemical science

Galvanic replacement synthesis of AgxAu1−x@CeO2 (0 ≤ x ≤ 1) core@shell nanospheres with greatly enhanced catalytic performance