Chemically resistant, oxidic electrocatalyst for oxygen evolution during alkaline water electrolysis

US11111587B2 · kind B2 · utility

Assignee

• Forschungszentrum Jülich GmbH · DE

Inventors

• Daniel Bick · Aachen, DE
• Ilia Valov · Aachen, DE
• Theodor Schneller · Aachen, DE
• Rainer Waser · Aachen, DE

Key dates

• Filing date: Mar 28, 2018
• Grant date: Sep 7, 2021
• Expiry date: Nov 3, 2038

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01M2004/8684
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Disclosed is a biphasic electrically conductive perovskite-based mixed oxide of the structure ABO3 with A=Ba, and B=Co, comprising additionally 5-45 at %, preferably 15 to 30 at %, particularly preferably 25 at % Co3O4 (at % Co based on the total number of Co atoms in the perovskite ABO3 and 0.5 to 0.3 at %, preferably 1 to 2.5 at %, particularly preferably 2 at % (wherein the at % are referred to the total number of B cations in the perovskite ABO3) Ti as dopant. Preferably, the mixed oxide has the stoichiometric formula BaCo1−xTixO3−δ:Co3O4 with x=0.005 to 0.03, preferably x=0.01 to 0.025, particularly preferably x=0.02, wherein δ defines the vacancies in the perovskite structure and is in the range of about 0.1 to 0.8, preferably 0.3 to 0.7, particularly preferably about 0.5 to 0.6. Further disclosed are 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 preparation of an anode for alkaline water electrolysis or metal-air batteries. Further, manufacturing processes for a precursor solution for the mixed oxide and for the inventive anode are disclosed, as well as …