| 초록 |
An ionic thermoplastic elastomer, poly((t-butyl-styrene)-b-(ethylene-r-propylene)-b-(styrene-r-styrene sulfonate)-b-(ethylene-r-propylene)-b-(t-butyl-styrene)) (tBS-EP-SS-EP-tBS; SSPB) pentablock copolymer, was used as a matrix for platinum deposition via a chemical plating procedure. From scanning transmission electron microscopy and electron diffraction, the reduced platinum particles were observed in the whole cross-section area of the SSPB membrane with the thickness of 200 m. Typically, conventional ionic polymer membranes such as Nafion have the platinum penetration depth of 210 μm into the membranes. It was attributed to the wide ionic channel structure, which promotes the diffusion of the reducing agent for platinum, leading to the formation of platinum particles in the whole membrane thickness. This morphology of the ionic polymer-metal nanocomposites can be utilized in the polymer fuel cells because platinum dispersed in the electrolyte as a catalyst reduces the fuel crossover and develops the self-humidifying ability. |
