التفاصيل البيبلوغرافية
| العنوان: |
Mimicking the microbial oxidation of elemental sulfur with a biphasic electrochemical cell. |
| المؤلفون: |
Suárez-Herrera, Marco F.1,2 (AUTHOR) mfsuarezh@unal.edu.co, Gamero-Quijano, Alonso1,3 (AUTHOR), Solla-Gullón, José4 (AUTHOR), Scanlon, Micheál D.1,3 (AUTHOR) micheal.scanlon@ul.ie |
| المصدر: |
Electrochimica Acta. Jan2022, Vol. 401, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*ELECTRIC batteries, *OXIDATION-reduction reaction, *SULFUR, *GOLD catalysts, *GOLD nanoparticles, *SULFUR cycle |
| مستخلص: |
The lack of an artificial system that mimics elemental sulfur (S 8) oxidation by microorganisms inhibits a deep mechanistic understanding of the sulfur cycle in the biosphere and the metabolism of sulfur-oxidising 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 S 8 , overcoming the incompatible solubilities of the hydrophobic reactants (O 2 and S 8) and hydrophilic products (H +, SO 3 2–, SO 4 2–, etc.). Furthermore, the interfacial AuNPs provide a catalytic surface onto which O 2 and S 8 can adsorb. Control over the driving force for the reaction is provided by polarising the L|L interface externally and tuning the Fermi level of the interfacial AuNPs by the adsorption of aqueous anions. Comparison of electrochemical measurements using a 4-electrode closed bipolar electrochemical cell and a L|L electrochemical cell confirmed that electron transfer reactions are possible between O 2 , gold and S 8 in biphasic systems. The homogeneous oxidation of elemental sulfur at low temperatures is unlikely in a homogeneous phase as the reactants, intermediates and products have different solubility properties. A biphasic system overcomes these solubility limitations, while simultaneously providing an electrochemically controlled catalytic surface when the liquid|liquid interface is functionalised by a film of gold nanoparticles. [Display omitted] [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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