(Digital Presentation) Oxygen Evolution Reaction on Non-Precious Metal Oxide-Based Electrocatalysts With and Without Low Potential Scan in Acidic Solution

Abstract

In order to develop non-platinum group metals anode electrocatalyst for the proton exchange membrane water electrolysis, the catalytic activity of Mn added Ta and Mo oxide-based electrocatalyst with and without low potential scan for the oxygen evolution reaction (OER) have been investigated. Both Mn added Ta and Mo oxide-based electrocatalyst without low potential scan (Mn-TaOx (E low = 1.2 V) and Mn-MoOx (E low = 1.2 V)) had much higher OER activity than that with low potential scan ((Mn-TaOx (E low = 0.05 V) and Mn-MoOx (E low = 0.05 V)) because the charge transfer resistance of both Mn-TaOx and Mn-MoOx (E low = 1.2 V) were drastically smaller than that of Mn-TaOx and Mn-MoOx (E low = 0.05 V). From SEM and XPS spectra, containing amount of Mn has maintained after electrochemical measurement in both bulk and surface of Mn-TaOx and Mn-MoOx without low potential scan (E low = 1.2 V) while containing amount of Mn was reduced after electrochemical measurement in both bulk and surface of Mn-TaOx and Mn-MoOx with low potential scan (E low = 0.05 V).