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An analysis of X-ray absorption spectra in the XANES region of platinum-based electrocatalysts for low-temperature fuel cells

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Abstract

The knowledge of the electronic state of Pt-based electrocatalysts used in low temperature fuel cells is very important for the understanding of the activity of the material. Near-edge X-ray absorption spectroscopy (XANES), a particular region of the X-ray absorption spectra (XAS), can provide the desired information, but the analysis is not straightforward, particularly for the non-specialist. Mansour et al. (J. Phys. Chem., 88:2330, 1984) and Shukla et al. (J. Electroanal. Chem., 563:181, 2004) presented methods to obtain information on electronic states from XANES spectra. In this work, procedures to implement the two methods are presented in detail and applied to XANES results for Pt2Sn1/C and Pt/C electrocatalysts prepared in this laboratory. The scope and limitations of the two methods are also discussed. The results show that the presence of Sn in the Pt2Sn1/C material promotes a partial filling of the Pt 5d band, in comparison to Pt/C, which contributes to explain the better activity of the bimetallic material.

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Acknowledgment

The authors thank Fundação de Amparo à Pesquisa do Estado de São Paulo, Conselho Nacional de Desenvolvimento Científico e Tecnológico, and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior for financial support and the Brazilian Synchrotron Light Laboratory (LNLS) for assisting with the XAS experiments.

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Authors and Affiliations

  1. Instituto de Química de São Carlos (IQSC), Universidade de São Paulo (USP), Av. Trabalhador Sãocarlense, 400, C.P. 780, 13560-970, São Carlos, SP, Brazil

    Ruy Sousa Jr., Flávio Colmati, Eduardo Gonçalves Ciapina & Ernesto Rafael Gonzalez

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  1. Ruy Sousa Jr.
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  2. Flávio Colmati
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  3. Eduardo Gonçalves Ciapina
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  4. Ernesto Rafael Gonzalez
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Corresponding author

Correspondence to Ernesto Rafael Gonzalez.

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This paper is dedicated to Prof. Francisco Nart, in memoriam.

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Sousa, R., Colmati, F., Ciapina, E. et al. An analysis of X-ray absorption spectra in the XANES region of platinum-based electrocatalysts for low-temperature fuel cells. J Solid State Electrochem 11, 1549–1557 (2007). https://doi.org/10.1007/s10008-007-0354-9

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  • DOI: https://doi.org/10.1007/s10008-007-0354-9

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