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A Binuclear Iron-Thiolate Catalyst for Electrochemical Hydrogen Production in Aqueous Micellar Solution

Abstract : The substituted iron–thiolate complex [Fe2(μ-bdt)(CO)4{P(OMe)3}2] (bdt=benzenedithiolate) is an active catalyst for electrochemical hydrogen production in aqueous sodium dodecyl sulfate solution, with a high apparent rate constant of 4×106 M−1 s−1. The half-peak potential for catalysis of proton reduction is less negative than −0.6 V versus the standard hydrogen electrode at pH 3. Voltammetric data are consistent with the rate of electrode reaction controlled by diffusion. A mechanism that begins with the rapid protonation of the iron–thiolate catalyst is proposed. The Faradaic efficiency in diluted HCl solutions is close to 100 %, but the catalytic activity decayed after about twelve turnovers when electrolysis was carried out in the presence of acetic acid.
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https://hal.univ-brest.fr/hal-01556797
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Submitted on : Wednesday, July 5, 2017 - 3:31:14 PM
Last modification on : Wednesday, September 11, 2019 - 2:14:07 PM

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François Quentel, Guillaume Passard, Frederic Gloaguen. A Binuclear Iron-Thiolate Catalyst for Electrochemical Hydrogen Production in Aqueous Micellar Solution. Chemistry - A European Journal, Wiley-VCH Verlag, 2012, 18 (42), pp.13473 - 13479. ⟨10.1002/chem.201201884⟩. ⟨hal-01556797⟩

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