Amperometric hydrogen peroxide sensor using carbon electrode loaded with perovskite-type oxide

Amperometric sensing properties to H2O2 of the carbon electrodes loaded with various perovskite-type oxides have been investigated. It was found that the carbon electrodes loaded with perovskite-type oxides showed high activity to anodic reaction including H2O2. A limiting current was observed at the electrode potential between 0.7 and 1.0 V vs. SCE. and the current at a fixed potential increased with increasing H2O2 concentration between 10 and 1000 muM (M = mol dm(-3)). H2O2 responses of the elements loaded with La0.6Ca0.4BO3 (B = Fe and Cr) were hardly affected by dissolved oxygen. All solid-state H2O2 sensor element based on solid polymer electrolyte and La0.6Ca0.4FeO3-based electrodes also responded well to H2O2 at the concentration between 50 and 200 muM, with the 90% response time of as short as 20 s.