HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Molecular material based on electropolymerized cobalt macrocycle for electrocatalytic hydrogen evolution

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.
Complete list of metadata

https://hal.univ-brest.fr/hal-01322706
Contributor : Stephane Rioual Connect in order to contact the contributor
Submitted on : Friday, May 27, 2016 - 3:08:44 PM
Last modification on : Wednesday, November 3, 2021 - 7:11:49 AM

Identifiers

  • HAL Id : hal-01322706, version 1

Collections

Citation

Stéphane Rioual, Benoit Lescop, Francois Quentel, Frederic Gloaguen. Molecular material based on electropolymerized cobalt macrocycle for electrocatalytic hydrogen evolution . Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2016. ⟨hal-01322706⟩

Share

Metrics

Record views

55