Methods of preparing electrocatalysts for fuel cells in core-shell structure and electrocatalysts

摘要

Provided are a method of preparing an electrocatalyst for fuel cells in a core-shell structure, an electrocatalyst for fuel cells having a core-shell structure, and a fuel cell including the electrocatalyst for fuel cells. The method may be useful in forming a core and a shell layer without performing a subsequent process such as chemical treatment or heat treatment and forming a core support in which core particles having a nanosize diameter are homogeneously supported, followed by selectively forming shell layers on surfaces of the core particles in the support. Also, the electrocatalyst for fuel cells has a high catalyst-supporting amount and excellent catalyst activity and electrochemical property.

主权项

1. A method of preparing an electrocatalyst for fuel cells, the method comprising:
preparing a core support in which core particles having a nanosize diameter are supported through out a support by a reaction of the support and metal precursors for forming core particles in an ether-based solvent; and selectively forming shell layers on surfaces of the core particles by a reaction of the core support and metal precursors for forming shell layers in the presence of a Hanztsch ester-based reducing agent, wherein the Hanztsch ester-based reducing agent comprising formula (3) wherein R is an alkyl group haying 1 to 4 carbons.