Effect of Acetic Acid on Carbon Monoxide Electrooxidation over Tin Oxide and Rhodium-Modified Platinum Electrode Materials

详细信息    查看全文

• 作者：Layciane A. Soares ; Fabiana L. S. Purgato ; Claudia Morais…
• 关键词：Pt ; based nanoparticles ; Tin oxide ; Rhodium oxide ; CO oxidation ; Acetic acid
• 刊名：Electrocatalysis
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：8
• 期：1
• 页码：11-15
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Electrochemistry; Physical Chemistry; Catalysis; Energy Technology;
• 出版者：Springer US
• ISSN：1868-5994
• 卷排序：8

文摘

The ethanol-to-CO₂ conversion in a direct ethanol fuel cell application, which should theoretically exchange 12 electrons/molecule, leads mainly to acetic acid and, in a small amount, to carbon monoxide (CO) at the surface of Sn and Rh oxide-modified anode materials. According to the amount of these intermediate products, the reaction mechanism was found to be thoroughly modified. Therefore, investigations with cyclic voltammetric CO stripping combined with in situ infrared spectroscopy have aided to assess how the amount of produced acetic acid influenced CO electrooxidation using Pt/C, Pt₈₀Rh₂₀/C, Pt–SnO₂/C, or Pt₈₀Rh₂₀–SnO₂/C as electrode material. Based on the results, the adsorption of CO was hindered when the acetic acid concentration increased and the potential of the CO oxidation process shifted toward higher values.