Issue 10, 1981

Colloidal platinum catalysts for the reduction of water to hydrogen, photosensitised by reductive quenching of zinc porphyrins

Abstract

EDTA transfers an electron to the triplet excited state of ZnTMPyP4+ in aqueous solution and the one-electron reduction product of the zinc porphyrin reduces water to H2. A Pt catalyst is required to promote this latter reaction and it was found that the nature of the support used to stabilise the colloidal Pt particle against flocculation had a great effect upon the efficiency of the Pt catalyst. The most effective support was Carbowax 20M and irradiation of ZnTMPyP4+ in the presence of EDTA (0.1 mol dm–3) and Pt–Carbo (10–4 mol dm–3) resulted in formation of H2 with an optimum quantum yield (ϕ½ H2) of 0.07.

The average lifetime of the reduced zinc porphyrin was increased by binding the porphyrin to a polymer and by using a surfactant derivative of the porphyrin. In the latter case, the surfactant porphyrin was used as a support for colloidal Pt particles and upon irradiation in the presence of EDTA H2 was produced with ϕ½ H2 of ca. 0.004; this was increased significantly when methyl viologen was present in the aqueous solution.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans. 2, 1981,77, 1939-1948

Colloidal platinum catalysts for the reduction of water to hydrogen, photosensitised by reductive quenching of zinc porphyrins

A. Harriman, G. Porter and M. Richoux, J. Chem. Soc., Faraday Trans. 2, 1981, 77, 1939 DOI: 10.1039/F29817701939

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements