Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 103, Issue 1-2, Pages 253-260Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2011.01.036
Keywords
Catalysis; Galvanic displacement; Nanocomposite; Silver; Platinum
Funding
- Ministry of Education, Science, and Technology [2010-0015806, 2009-0082846]
- NRF [2010-0001635]
- BK21 scholarship
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Hollow Pt/Ag composite nanospheres, which show highly enhanced catalytic properties, have been prepared through a galvanic replacement reaction of silver nanoparticles dispersed in Ptn+-added water. Ptn+, prepared in advance by the partial reduction of Pt4+ with weak reducing agents, is readily reduced galvanically to form porous Pt shells, and concomitantly produced Ag+ diffuses out to produce hollow Pt/Ag nanocomposites finally. The residual silver has been further eliminated from the composites with 0.5 M HNO3(aq) to produce hollow Pt nanospheres. Hollow Pt/Ag composite nanostructures have been found to catalyze the degradation of rhodamine B efficiently in the presence of KBH4, although their catalytic performances depend highly on the metals, sizes, and shapes of the nanostructures. (C) 2011 Elsevier B.V. All rights reserved.
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