Preparation of carbon-supported nanosegregated Pt alloy catalysts for the oxygen reduction reaction using a silica encapsulation process to inhibit the sintering effect during heat treatment

[摘要]：The heat treatment of alloy nanoparticles to improve their catalytic properties generally results in severe sintering. In this study, we report a new synthetic process of silica encapsulation to inhibit the sintering of Pt3Co1 alloy particles during heat treatment at high temperature. The silica layer acts as a physical barrier to prevent sintering; thus, the carbon-supported Pt3Co1 alloy nanoparticles retained their small particle size after heat treatment. The heat treatment allows the atoms to rearrange themselves, which results in a Pt-rich surface of the alloy nanoparticles. As a result, catalytic activity and stability were improved significantly.

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