Highly stable platinum alloy catalyst for methanol electrooxidation

摘要

A catalyst for use in at the anode of direct methanol fuel cells is made from nanoparticles having a core-shell structure. The core is an alloy of platinum and gold. The core is surrounded by a first shell of ruthenium and a second shell containing a ternary alloy of platinum, gold, and ruthenium. The catalyst can be made by a reverse-micelle method or by a single-phase scalable method. The catalyst is highly stable under conditions of use and resists dissolution of ruthenium or platinum.

主权项

1. A platinum alloy nanoparticulate catalyst for a fuel cell, comprising a plurality of core-shell nanoparticles attached to a plurality of carbon support particles, wherein the nanoparticles comprise:
a core structure comprising an alloy of Pt and Au atoms; a first shell structure surrounding the core structure, wherein the first shell structure consists essentially of Ru atoms; and a second shell structure surrounding the first shell structure, wherein the second shell structure comprises an alloy of Pt, Ru, and Au atoms,wherein Au in the core structure and the second shell has an amorphous, non-crystalline structure.