Kinetics of ethanol electrooxidation at Pd electrodeposited on Ti

Pd nanoparticles dispersed well on Ti were successfully prepared by the electrodeposition method used in this study. The results show that Pd has no activity for ethanol oxidation in acid media and is a good electrocatalyst for ethanol oxidation in alkaline media when the OH− concentration is greater than 0.001 M. The pH and ethanol concentration affects the ethanol oxidation. The reaction orders for OH− and ethanol are 0.2 and 1. The anodic transfer coefficient (α) is 0.1. The diffusion coefficient (D) of ethanol is calculated as 9.3 × 10−5 cm2 s−1 (298 K) when the concentration of KOH and ethanol is both 1.0 M. The overall rate equation for ethanol oxidation on Pd/Ti electrode in alkaline media is given as j=1.4×10-4CKOH0.2Cethanol exp 0.28FRTη.