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Size Effects in Monolayer Catalysis—Model Study: Pt Submonolayers on Au(111)

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Abstract

The two-dimensional Pt submonolayers on Au(111) were used as model catalyst system to study kinetics of hydrogen oxidation reaction (HOR). The morphology of different Pt submonolayers was characterized by ex situ scanning tunneling microscopy combined with statistical image analysis. The HOR kinetics data were analyzed using Levich–Koutecky formalism and presented as a function of the mean size of Pt clusters for each Pt submonolayer. The Pt submonolayers with smaller Pt clusters were found less active for HOR. This trend is well correlated with the continuum elasticity analysis of the average active strain in Pt clusters indicating that smaller clusters have less tensile strain. The density functional theory calculations were found in agreement with our results demonstrating that the size-dependent strain in Pt clusters has significant effect on the energy of the d-band center, i.e., the Pt clusters’ activity.

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Acknowledgment

The authors would like to thank Prof. P. Sharma from University of Houston for the useful discussions regarding strain calculations. DFT calculations are carried out at the Center for Functional Nanomaterials, Brookhaven National Laboratory, which is supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886. This material is based upon the work supported by the National Science Foundation under the contract CHE-0955922.

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Author notes

  1. Sang-Eun Bae

    Present address: KAERI, Daejeon, South Korea

Authors and Affiliations

  1. Cullen College of Engineering, University of Houston, N308, Eng. Bldg. 1, Houston, TX, 77204-4005, USA

    Sang-Eun Bae, Dincer Gokcen, Parnia Mohammadi & Stanko R. Brankovic

  2. Center for Functional Nanomaterials, Brookhaven National Lab, Upton, NY, 11973, USA

    Ping Liu

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  1. Sang-Eun Bae
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  2. Dincer Gokcen
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  5. Stanko R. Brankovic
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Correspondence to Stanko R. Brankovic.

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Bae, SE., Gokcen, D., Liu, P. et al. Size Effects in Monolayer Catalysis—Model Study: Pt Submonolayers on Au(111). Electrocatalysis 3, 203–210 (2012). https://doi.org/10.1007/s12678-012-0082-5

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