I  U  P  A  C






News & Notices

Organizations & People

Standing Committees

Divisions

Projects

Reports

Publications
..CI
..PAC
..Macro. Symp.

..Books
..Solubility Data

Symposia

AMP

Links of Interest

Search the Site

Home Page

 

Pure Appl. Chem. Vol. 72, Nos. 1-2, pp. 317-325, 2000

Special Topic Issue on the Theme of
Nanostructured Systems

 

Core/shell-structured bimetallic nanocluster catalysts for visible-light-induced electron transfer

Naoki Toshima

Department of Materials Science and Engineering, Science University of Tokyo in Yamaguchi, Onoda-shi, Yamaguchi 756-0884, Japan

Abstract: It has been found that the bimetallic nanoclusters often have so-called core/shell structure if they are prepared by alcohol-reduction of two kinds of noble metal ions in the presence of a water-soluble polymer like poly(N-vinyl-2-pyrolidone)(PVP), and that the core/ shell structured bimetallic nanoclusters have much higher catalytic activity than the corresponding monometallic nanoclusters. Here, several kinds of monometallic and bimetallic nanoclusters are synthesized by the similar method, and the catalyses are measured. Thus, the colloidal dispersions of Au, Pt, Pd, Rh, and Ru monometallic, and Au/Pt, Au/Pd, Au/Rh, and Pt/Ru bimetallic nanoclusters were synthesized and applied as the catalysts for visible-light- induced hydrogen generation. The core/shell structures are analyzed mainly by UVÆvis spectra. The rate of electron transfer from the methyl viologen cation radical to the metal nanoclusters is proportional to the hydrogen generation rate at the steady state. All the electrons accepted by the metal nanoclusters are used for the hydrogen generation. Both electron transfer and hydrogen generation rates increase when the bimetallic nanoclusters are used in place of the corresponding monometallic nanoclusters. The most active catalysts were Au/Rh and Pt/Ru bimetallic nanoclusters.

Back to Contents for access to full text


Page last modified 5 May 2000.
Copyright ©2000 International Union of Pure and Applied Chemistry.
Questions or comments about IUPAC, please contact, the Secretariat.
Questions regarding the website, please contact web manager.

õ