Preparation of a Channel Flow Double Electrode to Investigate Oxide Powder Electrodes

Abstract

A channel flow double electrode (CFDE) was fabricated in order to investigate oxygen reductions with powder type of perovskite oxides. The clay electrode, which consisted of the perovskite oxide powder, carbon powder and binder, was used as the working electrode. From the measurement of the electrochemical impedance, the resistance of the clay electrode was confirmed to be small enough to use in the electrochemical measurements. The collecting electrode current was measured and plotted against the working electrode potential, and the amount of evolved hydrogen peroxide was determined. Moreover, the average number of charge transfer was calculated from the working and collecting electrode currents. The values of were approximately 4 for LaMnO_3.15, 3 - 4 for LaMnO₃, and 2.5 - 4 for LaFeO₃. In the course of the above-mentioned experiment, the ability of the CFDE for the study of oxygen reduction catalytic activity of powder oxide has been confirmed.