Electrooxidation of Ethanol on Platinum Nanocubes Supported on Multi-walled Carbon Nanotubes

doi:10.7503/cjcu20120468

Abstract

Abstract:

Platinum nanocubes deposited on glassy carbon(Pt^cube/GC) or multi-walled carbon nanotubes(MWCNTs)(Pt^cube/MWCNTs) were prepared with electrochemical deposition using linear sweep voltammetry. SEM and TEM results show that the average particle size of Pt^cube/GC is 38 nm, which is composed of small particles surrounded by the Pt(111) preferred orientation. Electrochemical investigations including cyclic voltammetry and current-time curves, show that these two kinds of Pt cubes exhibit a higher catalytic activity and better stability for the oxidation of ethanol than commercial Pt/C. It is worth to note that Pt nanocubes show an onset potential shifted negatively by 168 mV than commercial Pt/C sample. Electrochemical in-situ FTIR spectroscopy was also used to study the adsorption and oxidation behavior of ethanol oxidation in acidic media on Pt^cube/MWCNTs and commercial Pt/C. The results show that negative shift of oxidation potential and increase of catalytic activity on Pt^cube/MWCNTs are mainly due to direct oxidation of ethanol to acetic acid at low potentials. In addition, the nanocubes also exhibit stronger CO adsorption.

Key words: Multi-walled carbon nanotubes, Platinum nanocubes, Ethanol, Electro-catalysis, in-situ FTIR

CLC Number:

O646

TrendMD:

LI Yan-Yan, RAO Lu, JIANG Yan-Xia, LIU Zi-Li, HE Chun-Lan, ZHANG Bin-Wei, SUN Shi-Gang. Electrooxidation of Ethanol on Platinum Nanocubes Supported on Multi-walled Carbon Nanotubes[J]. Chem. J. Chinese Universities, 2013, 34(2): 408.

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Electrooxidation of Ethanol on Platinum Nanocubes Supported on Multi-walled Carbon Nanotubes

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