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Mimicking the Microbial Oxidation of Elemental Sulfur with a Biphasic Electrochemical Cell

submitted on 03.03.2021, 17:59 and posted on 04.03.2021, 12:05 by Marco F. Suárez-Herrera, Jose Solla-Gullon, Micheal D. Scanlon

The lack of an artificial system that mimics elemental sulfur (S8) oxidation by microorganisms inhibits a deep mechanistic understanding of the sulfur cycle in the biosphere and the metabolism of sulfur-oxidizing microorganisms. In this article, we present a biphasic system that mimics biochemical sulfur oxidation under ambient conditions using a liquid|liquid (L|L) electrochemical cell and gold nanoparticles (AuNPs) as an interfacial catalyst. The interface between two solvents of very different polarity is an ideal environment to oxidise S8, overcoming the incompatible solubilities of the hydrophobic reactants (O2 and S8) and hydrophilic products (H+, SO32–, SO42–, etc.). The interfacial AuNPs provide a catalytic surface onto which O2 and S8 can adsorb. Control over the driving force for the reaction is provided by polarizing the L|L interface externally and tuning the Fermi level of the interfacial AuNPs by the adsorption of aqueous anions.


Science Foundation Ireland Grant No. 13/SIRG/2137

European Research Council Starting Grant (Agreement No. 716792)

Fundación banco de la República grant 4.562


Email Address of Submitting Author


University of Limerick



ORCID For Submitting Author


Declaration of Conflict of Interest

The authors declare no conflict of interest.

Version Notes

Currently submitted to a journal and under peer-review.