▎ 摘　　要

NOVELTY - Preparing three-dimensional graphene comprises (i) mixing first chloride salt and second chloride salt in a certain mass ratio to obtain mixed salt, (ii) adding water into egg white and stirring to mix well, (iii) adding egg white into mixed salt, and mixing mixed salt and egg white, (iv) drying mixture of mixed salt and egg white, and then carbonizing, eluting with water, and acid cleaning to obtain final product. USE - The three-dimensional graphene is useful as cathodic oxygen reduction catalyst for fuel cells (claimed). ADVANTAGE - The method is simple and the product has large specific surface and large total pore volume. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for three-dimensional graphene obtained by above method.