A Binuclear Iron–Thiolate Catalyst for Electrochemical Hydrogen Production in Aqueous Micellar Solution |
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Authors: | Dr François Quentel Guillaume Passard Dr Frederic Gloaguen |
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Institution: | UMR 6521, CNRS, Université de Bretagne Occidentale, 6 Avenue Le Gorgeu, Brest (France), Fax: (+33)?298‐017001 |
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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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Keywords: | electrocatalysis hydrides hydrogenases organometallic complexes water splitting |
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