Long Time Hydrogen Evolution from Water Using Tris (2, 2'-bipyridine) ruthenium (II)-methylviologen-platinum System as Visible-light Photocatalyst

Abstract

Photo-evolution of hydrogen from water using tris (2, 2'-bipyridine) ruthenium (II) complex, methylviologen, disodium dihydrogenethylene-N, N, N', N'- tetraacetate and colloidal platinum was examined for long time over 14h. The evolution of hydrogen terminated at about 8 h in spite of presence of reactants. When solid ethylene-N, N, N', N'-tetraacetic acid was added to the system, the evolution of hydrogen proceeded over 14 h; added solid ethylene-N, N, N', N'-tetraacetic acid remained solid and the pH of the reaction solution was below 4.5 throughout the reaction.