Micro- and Mesopore Size-Dependent Alcohol Electrooxidation Kinetics on Porous Platinum Electrode

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Abstract
Morphological engineering of platinum-based electrocatalysts has been widely explored to enhance anodic alcohol oxidation in direct alcohol fuel cells. Recently, three-dimensional structures incorporating micro- and mesopores have been developed as promising anode electrocatalyst structures for direct alcohol fuel cells. However, the influence of their pore size on the catalytic activity and stability remains unclear. In this study, platinum model electrodes with cylindrical pores of 1.3, 1.8, and 3.0 nm were used to systematically evaluate the influence of platinum micro- and mesopore size on the electrooxidation of ethylene glycol, methanol, and ethanol in 1.0 mol dm –3 KOH aqueous solution. The oxidation kinetics were evaluated using voltammograms, Tafel plots, and chronoamperograms with current densities normalized to electrochemical surface area. The observed relationship between the platinum pore size and alcohol oxidation activity as well as durability is discussed based on the d-band center downshift associated with a decrease in pore size, providing fundamental insights into catalyst nanostructure–reaction performance relationships.
Funding Information
  • Japan Society for the Promotion of Science (23KJ0894)
  • Japan Society for the Promotion of Science (JPJSJRP20221602)

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