Bifunctional oxygen electrocatalyst, preparation method and use thereof

A method for preparing a bifunctional oxygen electrocatalyst, the bifunctional oxygen electrocatalyst being represented by A1-x-yBxCyO2, wherein;

• element A is one selected from the group consisting of Pt, Ir, Ru, and Pd;
• each of element B and element C is selected from the group consisting of Mo, Mn, Fe, Co, Ni, Cu, and Zn;
• the bifunctional oxygen electrocatalyst is a three-dimensional porous foam sheet catalyst;
• and
• x and y represent atomic percentages of the element B and the element C, respectively, and a sum of atomic percentages of the element A, the element B and the element C in the catalyst is 100 at. %;
• optionally, the element B is the same as the element C;
• the method comprising;
• 1) mixing a metal salt of the element A, a metal salt of the element B, a metal salt of the element C with a carbohydrate and a gas generating compound uniformly in water to form a precursor solution;
• and
• 2) pre-sintering the precursor solution, and calcining the product obtained after pre-sintering to obtain the bifunctional oxygen electrocatalyst.