Abstract
Platinum-porous carbon composite was prepared using a microreactor which could rapidly mix liquids. A 0.8 wt% aqueous solution of alginate acid as a raw carbon material and aqueous solutions of 0.01 M cis-PtCl2(NH3)2 and H2PtCl6 as a raw platinum material were used. These solutions were well mixed through the microreactor without stirring operation. The white yellow solid precipitated by centrifuging was carbonized in a stream of N2. Thus, the platinum-porous carbon composite material was prepared.
The specific surface area of the composite was greater with increasing of heat treatment temperature. The specific surface area was 460∼550 m2/g. In addition, the specific surface area was independent on the flow rate of the feed solutions. It was confirmed by XRD analysis that platinum in the composite was in metallic state. By EDX analysis, platinum metal was confirmed to be well dispersed highly in the porous carbon. About the content of platinum in the composite, cis-PtCl2(NH3) was significantly greater than H2PtCl6. The composite which included the 5 nm platinum particle in diameter was prepared from H2PtCl6 by heat treatment temperature at 500°C.
