Jump to main content
Jump to site search

Issue 1, 2016
Previous Article Next Article

Light driven styrene epoxidation and hydrogen generation using H2O as an oxygen source in a photoelectrosynthesis cell

Author affiliations

Abstract

A dye-sensitized photoelectrosynthesis cell (DSPEC) has been prepared for the oxidation of alkenes to epoxides and evolution of hydrogen using water as an oxygen source and sunlight. A Ru oxidation catalyst, 2,2+, is used in the homogeneous phase in the anodic compartment to oxidize a water-soluble alkene, 4-styrene sulfonic acid (4-HSS), to the corresponding epoxide that in acidic solution is hydrolyzed to the diol (4-(1,2-dihydroxyethyl)-benzenesulfonic acid). Concomitantly, protons are generated that diffuse through a proton exchange membrane to a Pt cathode where they are transformed into hydrogen. Illumination under 1.5 AMG (100 mW cm−2) together with an external bias of 0.3 V vs. NHE after 24 h leads to the generation of 1.28 Coulombs together with the formation of 6.1 μmol of H2 at the cathodic compartment that corresponds to a faradaic efficiency of 92%. In addition 0.7 mM of the 4-HSS substrate has been oxidized at the anodic compartment with a conversion yield of 7%. The rate of hydrogen evolution is limited by the oxidation of the organic substrate, and the TOF for both reactions is measured to be 0.8 ks−1.

Graphical abstract: Light driven styrene epoxidation and hydrogen generation using H2O as an oxygen source in a photoelectrosynthesis cell

Back to tab navigation

Supplementary files

Publication details

The article was received on 13 Jul 2015, accepted on 28 Sep 2015 and first published on 02 Oct 2015


Article type: Paper
DOI: 10.1039/C5GC01589H
Author version
available:
Download author version (PDF)
Green Chem., 2016,18, 255-260

  •   Request permissions

    Light driven styrene epoxidation and hydrogen generation using H2O as an oxygen source in a photoelectrosynthesis cell

    P. Farràs, C. Di Giovanni, J. N. Clifford, P. Garrido-Barros, E. Palomares and A. Llobet, Green Chem., 2016, 18, 255
    DOI: 10.1039/C5GC01589H

Search articles by author

Spotlight

Advertisements