Preparation of Pt-loadedon Au nanorod and its catalytic reduction of 4-nitrophenol
Gold nanorods(AuNRs)with aspect ratio of about 4 were prepared by the seed growth method,and Pt were load-ed on gold nanorods by KI etching method to prepare Pt-Au nanorods(Pt-AuNRs).A series of conventional characterizations like UV-Vis spectrophotometry,transmission electron microscopy,and X-ray photoelectron spectroscopy were used to identify the physicochemical properties of AuNRs and Pt-AuNRs.The catalytic reduction of 4-nitrophenol(4-NP)with AuNRs and Pt-AuNRs as catalysts in the presence of NaBH4 was studied.The mechanism of Pt-AuNRs catalytic reduction of 4-NP was proposed for the first time.The results show that 500-Pt-AuNRs catalyst presents the best catalytic performance,and the rate constant Kapp = 0.3836 min-1,which is 4.7 times that of AuNRs catalyst.The special heterostructure,high surface activity and stability of Pt-AuNRs contribute to the high adsorption and electron transfer of BH-4 on its surface.
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