Insights on the electrooxidation of ethanol with Pd-based catalysts in alkaline electrolyte |
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| Affiliation: | 1. Grupo de Energía y Química Sostenibles, Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, 28049, Madrid, Spain;2. Departamento de Química Física Aplicada, Universidad Autónoma de Madrid, C/Francisco Tomás y Valiente 7, 28049, Madrid, Spain;3. Fundación ARAID, Gobierno de Aragón, Spain;4. LIFTEC, CSIC-Universidad de Zaragoza, C/María de Luna 10, 50018, Zaragoza, Spain;1. LAPEC/PPGE3M, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, 91501-970, Porto Alegre, RS, Brazil;2. Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN, Avenida Prof. Lineu Prestes, 2242, São Paulo, SP, 05508000, Brazil;3. Instituto de Química, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, 91501-970, Porto Alegre, RS, Brazil;1. Department of Chemical and Biomolecular Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;2. Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China;3. Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center for Energy Materials, Department of Chemistry, Fudan University, Shanghai 200433, PR China;4. Department of Chemistry, State University of New York at Binghamton, Binghamton 13902, NY, USA;1. Department of Applied Chemistry, University of Sistan and Baluchestan, P.O. Box 98135-674, Zahedan, Iran;2. Department of Chemistry, Organic and Polymer Research Laboratory, University of Sistan and Baluchestan, Zahedan, Iran;3. Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada;1. College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, Hebei, 050024, China;2. Institute of Nuclear & New Energy Technology, Beijing Key Lab of Fine Ceramics, College of Chemistry and Materials Science, Tsinghua University, Beijing, 100084, China |
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| Abstract: | In this work, we report a facile method of synthesis of carbon supported Pd, PdRu, and PdNi nanoparticles, and a comparative study of their catalytic behavior for the electrooxidation of ethanol in alkaline media. The addition of metals such as Ru or Ni increases the oxophilicity of the Pd surface, as observed from the shifting of the Pd oxide reduction peaks. As a consequence, the onset potential for the electrooxidation of ethanol shifts to less positive values on the bimetallic catalysts. The nature and evolution of the species formed during the electrooxidation of ethanol over the catalysts under study has been monitored using in situ infrared spectroscopy. In order to assess properly the evolution of the species formed during the electrooxidation of ethanol, infrared spectra have been recorded in both H2O and D2O electrolytes. The results presented in this work demonstrate that the scission of the C–C bond of ethanol takes place at the surface of Pd/C and PdM/C (M = Ni and Ru) at potentials as low as 30 mV. However, at potentials above E ≥ 400 mV, acetates are the main species formed during the electrooxidation of ethanol. |
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| Keywords: | Ethanol Electrooxidation Infrared Pd Alkaline DEFC |
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