Embodiments provide a nanoparticle and a method for preparing the nanoparticle, as well as a membrane that includes the nanoparticle and a fuel cell that includes the membrane. The method comprises a thermal treatment method that provides from a nanoparticle comprising a structurally disordered material the nanoparticle comprising: (1) a structurally ordered core comprising a first material; and (2) a shell surrounding and further structurally aligned with the structurally ordered core and comprising a second material different from the first material. Particularly desirable is a nanoparticle comprising a Pt.sub.3Co@Pt/C structurally ordered core-shell composition supported upon a carbon support.
STATEMENT OF GOVERNMENT INTEREST
 The research undertaken in support of the embodiments as disclosed herein, and the invention as claimed herein, was funded by the United States Department of Energy through grant number DE-FG02-87ER45298 and award number DE-SC0001086. The United States Government has rights in the invention as claimed herein.