Abstract
The gold/platinum bimetallic systems stabilized by polymer and micelle were obtained by alcohol- and photo-reduction of the corresponding metal ions in the presence of water-soluble polymers and non-ionic surfactant-micelles, respectively. The UV-Vis spectra and the transmission electron micrographs suggest that the polymer-protected gold/platinum bimetallic systems are composed of bimetallic alloy clusters, but the micelle-protected ones are mostly composed of the mixtures of the monometallic gold and platinum clusters. The in-situ UV-Vis spectra during the reductions can elucidate the formation processes of the bimetallic dispersions which are different from each other depending on the protective reagent. The gold/platinum bimetallic systems can be used as the catalyst for visible light-induced hydrogen evolution. The bimetallic system stabilized by the polymer at a molar ratio of Au/Pt = 2 3 is the most active catalyst.
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