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Size-Dependent Methanol Electro-oxidation Activity of Pt Nanoparticles with Different Shapes

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Abstract

We report a comparative electrochemical investigation of size-dependent methanol electro-oxidation activity on cubic vs. octahedral/tetrahedral Pt nanoparticles. The size range for the former was 9.5 nm to 5.6 nm to 4.5 nm and for the latter was 9.7 nm to 6.0 nm to 5.0 nm. Different trends were observed: the methanol activity increased as the nanoparticle size decreased on the cubic Pt nanoparticles but decreased on the octahedral/tetrahedral Pt nanoparticles. Although the presence of residual polyvinylpyrrolidone that was used as stabilizing ligand during the nanoparticles synthesis did complicate the mechanistic understanding of the observed trends, these observations nonetheless highlighted the fundamental and practical importance and the necessity of investigating and understanding, in a controllable fashion, the orientational sensitivity of catalytic activity at nanoscale in conjunction with size.

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Acknowledgments

The work is financially supported by grants from DOE (DE-FG02-07ER15895) and NSF (CHE-0923910).

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  1. Department of Chemistry, Georgetown University, 37th & O Streets, NW, Washington, DC, 20057, USA

    Ceren Susut & YuYe J. Tong

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  1. Ceren Susut
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  2. YuYe J. Tong
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Correspondence to YuYe J. Tong.

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Susut, C., Tong, Y.J. Size-Dependent Methanol Electro-oxidation Activity of Pt Nanoparticles with Different Shapes. Electrocatal 2, 75–81 (2011). https://doi.org/10.1007/s12678-011-0041-6

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