Bimetallic nanocatalysts synthesized via galvanic replacement reaction

Abstract

Bimetallic nanoparticles usually have more excellent catalytic, optical and electrical properties than that of corresponding monometallic nanoparticles. Co-reduction, successive reduction, galvanic replacement reaction, chemical vapor deposition, microemulsion and microwave assisted heating method are widely used for the preparation of bimetallic nanoparticles. Alloy, core@shell and hollow-structured bimetallic nanocatalysts with controllable structure and uniform particle size that prepared under mild conditions via galvanic reaction, usually possess highly catalytic activities. Recently development of bimetallic nanoparticles prepared by galvanic replacement reactions with structure of alloy, core@shell and hollow are introduced in present paper, and the effects of preparation condition such as the kind and composition of template nanoparticles, protective agents, reaction medium, reaction time and temperature, precursor concentration on the structure, and the catalytic activity of the as-prepared bimetallic nanoparticles are reviewed in detail. The present problems and potential development directions on bimetallic nanocatalysts with different structures synthesized by replacement reaction are also proposed.