Chemically stable, oxidic electrocatalyst for the evolution of oxygen during the alkaline water electrolysis based on BaCoO3-delta, process for its preparation and comprehensive anode and catalytically active and chemically stable reaction product thereof

摘要

A biphasic perovskite-based electrically conductive mixed oxide of the structure ABO with A = Ba, and B = Co, comprising additionally 5-45 at%, preferably 15 to 50 at%, particularly preferably 25 at% CoO (at% Co based on total number of Co-atoms in the perovskite ABO and 0.5 to 3 at%, preferably 1 to 2.5 at%, more preferably 2 at% (the at% being based on the total number of B-cations in the perovskite ABO) Ti as dopant. Preferably, the mixed oxide has the stoichiometric formula BaCoTiO: CoO with x = 0.005 to 0.03, preferably x = 0.01 to 0.025, particularly preferably x = 0.02, where δ defines the vacancies in the perovskite structure and in the range of in A range of about 0.1 to 0.8, preferably 0.3 to 0.7, more preferably about 0.5 to 0.6, further discloses a catalyst and an anode comprising the mixed oxide, the use of the catalyst in alkaline water electrolysis or in metal-air batteries, the use of the mixed oxide for the production An anode for alkaline water electrolysis or metal-air batteries. Further, manufacturing methods for a precursor solution for the composite oxide and for the anode according to the invention are disclosed, as well as an amorphous product of the composite oxide according to claim 1 or 2 with a ratio Co: Ba of about 2: 1, obtainable by using the mixed oxide according to the invention as a catalyst in the Oxygen evolution reaction of the alkaline water electrolysis, wherein the leaching of Ba produces said amorphous product.