Molecular material based on electropolymerized cobalt macrocycle for electrocatalytic hydrogen evolution

S. Rioual 1 B. Lescop 1 Francois Quentel 2 Frederic Gloaguen 2
1 LMB - Laboratoire de magnétisme de Bretagne
2 CEMCA - Chimie, Electrochimie Moléculaires et Chimie Analytique
Abstract : An electrocatalytic material for the H2 evolution reaction (HER) in acidic aqueous solution has been prepared by electropolymerization of Co(II) dibenzotetraaza[14] annulene (CoTAA). Chemical analysis by X-ray photoelectron spectroscopy (XPS) confirms that the structural integrity of the [CoII–N4] motif is preserved in the poly-CoTAA film. In acetate buffer solution at pH 4.6, an overpotential η = −0.57 V is required to attain a catalytic current density −ik = 1 mA cmgeom−2. The faradaic efficiency of poly-CoTAA for the HER is 90% over a period of one hour of electrolysis, but there is a decrease of the apparent concentration of Co sites after prolonged H2 production, which we ascribe to partial demetallation of the poly-CoTAA film at negative potentials.
Type de document :
Article dans une revue
PCCP : Physical chemistry chemical physics, Royal Society of Chemistry, 2016
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http://hal.univ-brest.fr/hal-01322706
Contributeur : Stephane Rioual <>
Soumis le : vendredi 27 mai 2016 - 15:08:44
Dernière modification le : jeudi 11 janvier 2018 - 06:19:29

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  • HAL Id : hal-01322706, version 1

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UNIV-BREST | INC-CNRS | CEMCA-BREST

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S. Rioual, B. Lescop, Francois Quentel, Frederic Gloaguen. Molecular material based on electropolymerized cobalt macrocycle for electrocatalytic hydrogen evolution . PCCP : Physical chemistry chemical physics, Royal Society of Chemistry, 2016. 〈hal-01322706〉

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