Loading patent…
AssigneeCeramatec, Inc.
InventorsJohn Gordon, Hachiya Toshinori, Shekar Balagopal, Sai Bhavaraju
Estimating the term…
An improved gas diffusion electrode composed of a perovskite-type oxide dispersed in a mixture of carbon black and a hydrophobic binder polymer. An improved catalyst for use in the electrochemical reduction of oxygen comprising a perovskite-type compound having alpha and beta sites, and having a greater molar ratio of cations at the beta site. A particularly good reduction catalyst is a neodymium calcium manganite. An improved method of dispersing the catalysts with carbon in a reaction layer of the electrode improves performance of the electrode and the oxygen reduction process. This is provided by adding carbon black to an aqueous solution of metal salts before it is heated to a gel and then to a char and then calcined. Optionally, a quantity of the desired oxide catalyst can be premixed with a portion the carbon before adding the carbon to an aqueous solution of the metal salts to be heated. The amount of premixed metal oxide is chosen in conjunction with the amount of metal salts to provide the desired molar ratio after heating and calcining of the aqueous solution.
A catalyst for use in the electrochemical reduction of oxygen comprising:
A catalyst for use in the electrochemical reduction of oxygen having a composition represented by the formula
A method for diffusing a catalyst with carbon for use in a gas diffusion electrode reaction layer, the method comprising the steps of:
The method of 18 wherein the catalyst has the formula A1-xA′x(B1-yB′y)zO3+δ the metal is selected from the group consisting essentially of La, Pr and Nd;
A gas diffusion electrode for electrochemical reduction of oxygen comprising:
A gas diffusion electrode for electrochemical reduction of oxygen comprising:
Dependencies are inferred from the claim text.