Galvanic replacement synthesis of Ag(x)Au(1–x)@CeO(2) (0 ≤ x ≤ 1) core@shell nanospheres with greatly enhanced catalytic performance

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 t...

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Detalles Bibliográficos
Autores principales: Liu, Dapeng, Li, Wang, Feng, Xilan, Zhang, Yu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Royal Society of Chemistry 2015
Materias:
Chemistry
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5532536/
https://www.ncbi.nlm.nih.gov/pubmed/28808522
http://dx.doi.org/10.1039/c5sc02774h
Descripción
Sumario: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.

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