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Ethanol Electro-oxidation on Pt/C Electrocatalysts: An “In Situ” Raman Spectroelectrochemical Study

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Abstract

This work presents an “in situ” spectroelectrochemical study of the ethanol oxidation reaction on Pt/C electrocatalysts prepared by the polymeric precursor method. Characterization of the electrocatalysts was performed with X-ray diffraction, Raman spectroscopy, and cyclic voltammetry measurements. The average crystallite size was estimated as 7 nm, in agreement with the value reported in the literature for these types of electrocatalysts. The cyclic voltammetry characterization in an acidic medium presented the expected voltammetric behavior for polycrystalline Pt/C. The ethanol oxidation process was successfully employed “in situ”, making use of an optical probe for excitation and collection of the Raman scattering signal. In this configuration it was possible to track the formation of the main products—CO, CO2 indirectly, acetaldehyde, and acetic acid—and to measure the decay of the ethanol concentration. The results indicate that the optical probe-based Raman spectroscopy technique is a very effective tool for studying “in situ” electrochemical oxidation reactions of ethanol. It might also be a very promising characterization technique for studies of the “in situ” electrochemical oxidation of small organic molecules.

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Acknowledgements

The authors wish to thank the Brazilian Funding Institutions (CNPq 474742-32/2008-8), CAPES, and FAPESP (Processes Numbers: 05/59992-6, 301018/2006-5, 09/09145-6) and UFABC for their financial support. In addition, the authors thank Prof. Vera R.L. Constantino from IQ-USP for the use of the XRD instrument; Dr. Ângela A. Teixeira Neto for assistance with XRD analysis; and Prof. Dr. Airton A. Martin from UniVap for the use of the Raman instrumentation.

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Authors and Affiliations

  1. LEMN—Laboratório de Eletroquímica e Materiais Nanoestruturados—CCNH—Centro de Ciências Naturais e Humanas, UFABC—Universidade Federal do ABC, Rua Santa Adélia 166, Bairro Bangu, 09.210-170, Santo André, São Paulo, Brazil

    Rodrigo F. B. De Souza, Érico Teixeira Neto & Mauro Coelho dos Santos

  2. GMAV—Grupo de Materiais e Métodos Avançados—CCNH—Centro de Ciências Naturais e Humanas, UFABC—Universidade Federal do ABC, Rua Santa Adélia 166, Bairro Bangu, 09.210-170, Santo André, São Paulo, Brazil

    Herculano S. Martinho

  3. Grupo de Materiais Eletroquímicos e Métodos Eletroanalíticos—Instituto de Química de São Carlos, Universidade de São Paulo, Caixa Postal 780, 13566-590, São Carlos, São Paulo, Brazil

    Marcelo L. Calegaro

  4. IP&D—Universidade do Vale do Paraíba, Avenida Shishima Hifumi, 2911, Urbanova, São José dos Campos, São Paulo, Brazil

    E. A. Santos

Authors
  1. Rodrigo F. B. De Souza
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  2. Érico Teixeira Neto
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  5. Herculano S. Martinho
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  6. Mauro Coelho dos Santos
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Correspondence to Mauro Coelho dos Santos.

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De Souza, R.F.B., Neto, É.T., Calegaro, M.L. et al. Ethanol Electro-oxidation on Pt/C Electrocatalysts: An “In Situ” Raman Spectroelectrochemical Study. Electrocatal 2, 28–34 (2011). https://doi.org/10.1007/s12678-010-0031-0

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