Hydrogen evolution in aqueous solutions containing dissolved H2S : Evidence of direct electroactive contribution of H2S

International audience This paper compares the cathodic reactions occurring on steel in an oxygen-free aqueous solution containing dissolved H 2 S or dissolved CO 2. It is well admitted that the rate of the cathodic reaction is enhanced in aqueous solutions containing dissolved CO 2 , in comparison...

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Bibliographic Details
Main Authors: Kittel, J., Ropital, Francois, Grosjean, François, Sutter, E., Tribollet, B.
Other Authors: IFP Energies nouvelles (IFPEN), Laboratoire Interfaces et Systèmes Electrochimiques (LISE), Institut de Chimie - CNRS Chimie (INC-CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Format: Conference Object
Language:English
Published: HAL CCSD 2012
Subjects:
[CHIM.MATE]Chemical Sciences/Material chemistry
Carbonic acid
Online Access:https://ifp.hal.science/hal-02475457
https://ifp.hal.science/hal-02475457/document
https://ifp.hal.science/hal-02475457/file/1124_Kittel_cathodic-contribution-H2S.pdf
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Summary:International audience This paper compares the cathodic reactions occurring on steel in an oxygen-free aqueous solution containing dissolved H 2 S or dissolved CO 2. It is well admitted that the rate of the cathodic reaction is enhanced in aqueous solutions containing dissolved CO 2 , in comparison with strong acid solutions at the same pH [1-6]. In a previous paper [7], the authors have shown that this phenomenon appears only in the mass transfer limitation region, where the transport of carbonic acid is added to the transport of proton. In the case of H 2 S containing solutions, this chemical mechanism is no more sufficient to explain the cathodic polarization curves. An additional electrochemical reaction is clearly observed, with strong links with H 2 S concentration.

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