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Electrooxidation of Acetaldehyde on Pt(111) Surface Modified by Random Defects and Tin Decoration

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Abstract

Acetaldehyde oxidation was studied on well-ordered Pt(111), stepped Pt(554), and disordered Pt(111). Random superficial defects of the {110}-type were electro-generated on well-ordered Pt(111) surface by successive potential cycling at 0.05 V s−1 between 0.05 and 1.3 V in 0.1 M HClO4 solution. In general, well-ordered Pt(111) is more active than stepped or disordered platinum surfaces for acetaldehyde oxidation. The reaction follows a dual pathways mechanism, leading each pathway to CO2 and acetic acid, respectively, as final products. The CO2 is produced via adsorbed CO and CHx reaction intermediates. Acetic acid comes from the adsorbed acetaldehyde oxidation. Additionally, acetaldehyde was also investigated on well-ordered Pt(111) and disordered Pt(111) surfaces, both modified by deposited tin submonolayers. An outstanding performance was observed when both, well-ordered and disordered Pt(111) surfaces, were modified by Sn. It was observed an extraordinary displacement of the onset potential for more negative potentials and an increased production of CO2 and acetic acid.

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Acknowledgements

This study is financially supported by FAPESP (process numbers 2019/22183-6 and 2017/09845-4), FAPEAL (process number 60030 1076/2016), CNPq, and CAPES. A. F. B. Barbosa especially thanks to FAPESP by the scholarship through process number 2016/13100-1.

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Authors and Affiliations

  1. Institute of Chemistry of São Carlos, University of São Paulo, Av. Trabalhador São Carlense, 400, São Carlos, SP, 13566-590, Brazil

    A. F. B. Barbosa, B. A. F. Previdello & G. Tremiliosi-Filho

  2. Federal Institute of Alagoas-Campus Penedo, Rod. Engenheiro Joaquim Gonçalves, s/n, Penedo, AL, 57200-000, Brazil

    A. F. B. Barbosa

  3. Department of Chemistry, Federal University of Alagoas-Campus Arapiraca, Av. Manoel Severino Barbosa s/n, Arapiraca, AL, 57309-005, Brazil

    V. Del Colle

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  1. A. F. B. Barbosa
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  2. V. Del Colle
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  3. B. A. F. Previdello
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  4. G. Tremiliosi-Filho
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Correspondence to G. Tremiliosi-Filho.

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Barbosa, A.F.B., Del Colle, V., Previdello, B.A.F. et al. Electrooxidation of Acetaldehyde on Pt(111) Surface Modified by Random Defects and Tin Decoration. Electrocatalysis 12, 36–44 (2021). https://doi.org/10.1007/s12678-020-00628-5

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