Jump to main content
Jump to site search

Issue 8, 2014
Previous Article Next Article

A Ru–Co hybrid material based on a molecular photosensitizer and a heterogeneous catalyst for light-driven water oxidation

Author affiliations

Abstract

A novel approach to anchor a molecular photosensitizer onto a heterogeneous water oxidation catalyst via coordination bonds is presented. A photosensitizer (1) based on [Ru(bpy)3]2+ and decorated with two methylenediphosphonate (M2P) groups has been designed and synthesized for this purpose. The M2P groups in complex 1 allow for coordination of cobalt ions to afford a novel molecular–heterogeneous hybrid material P1. Scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy and X-ray photoelectron spectroscopy (XPS) were used to characterize P1 as an amorphous, non-uniform material that contains Ru and Co in a ratio of 1 : 2. A suspension of P1 in a buffered aqueous solution is active as a light-driven water oxidation catalyst in the presence of persulfate (S2O82−) as electron acceptor. The yield of oxygen is higher when P1 is prepared in situ by mixing and illuminating 1 and Co2+ in the presence of S2O82−. After oxygen evolution ceases, a second material P2 can be isolated from the reaction mixture. P2 is characterized by a lower Ru content than P1, and contains Co in a higher oxidation state. Interestingly, P2 as a freshly prepared suspension is also active for light-driven water oxidation. It is shown that 1 resides in the interior of P1 and P2, and is thus in a location where undesirable quenching pathways of the photo-excited state of 1 limit the oxygen production yields for both P1 and P2.

Graphical abstract: A Ru–Co hybrid material based on a molecular photosensitizer and a heterogeneous catalyst for light-driven water oxidation

Back to tab navigation

Supplementary files

Publication details

The article was received on 02 Dec 2013, accepted on 23 Dec 2013 and first published on 02 Jan 2014


Article type: Paper
DOI: 10.1039/C3CP54500H
Citation: Phys. Chem. Chem. Phys., 2014,16, 3661-3669
  •   Request permissions

    A Ru–Co hybrid material based on a molecular photosensitizer and a heterogeneous catalyst for light-driven water oxidation

    H. Wang, J. Liu, J. Zhu, S. Styring, S. Ott and A. Thapper, Phys. Chem. Chem. Phys., 2014, 16, 3661
    DOI: 10.1039/C3CP54500H

Search articles by author

Spotlight

Advertisements