Carbon dioxide conversion to acetate and methane in a microbial electrosynthesis cell employing an electrically-conductive polymer cathode modified by nickel-based coatings

Par Conseil national de recherches du Canada

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DOI	Trouver le DOI : https://doi.org/10.1016/j.ijhydene.2021.10.003
Auteur	Rechercher : Nwanebu, Emmanuel¹; Rechercher : Omanovic, Sasha; Rechercher : Hrapovic, Sabahudin²; Rechercher : Gomez Vidales, Abraham¹; Rechercher : Tartakovsky, Boris¹
Affiliation	Conseil national de recherches du Canada. Énergie, les mines et l'environnement Conseil national de recherches du Canada. Développement des cultures et des ressources aquatiques
Format	Texte, Article
Sujet	CO₂ conversion; microbial electrosynthesis; conductive polymer cathode; Ni-Fe-Mn alloy
Résumé	In this study, CO₂ conversion to acetate and CH₄ was achieved in a flow-through laboratory-scale microbial electrosynthesis (MES) cell composed of a 3D conductive polylactic acid (cPLA) lattice cathode with electrodeposited metal electrocatalyst coatings. The MES cell with a bare cPLA cathode showed the poorest performance with the lowest H₂ and CH₄ production rates and low Coulombic efficiency. This was ascribed to a poor electrocatalytic activity of cPLA towards H₂ production and high electrode resistivity. When the cPLA electrode was modified with metal coatings, the CH₄, acetate and H₂ production rate increased significantly, with the following trend: cPLA < Ni < NiFe < NiFeMn. The better performance of the metal-coated cPLA in terms of CH₄ production was attributed to the lower electrical resistance, enhanced H₂ production and enhanced electron transfer between the cathode and the biofilm. At the cell potential of 2.8 V, the best-performing NiFeMn cPLA cathode showed stable production of CH₄ (50 ± 6 mL d⁻¹), acetate (185 ± 27 mg d⁻¹), and H₂ (545 ± 175 mL d⁻¹) at close to 100% Coulombic efficiency.
Date de publication	2021-10-23
Maison d’édition	Elsevier International Association for Hydrogen Energy
Dans	International Journal of Hydrogen Energy 47, nº 1 (23 octobre 2021) : 203–215.
Langue	anglais
Publications évaluées par des pairs	Oui
Numéro du CNRC	NRC-ACRD-PDB099
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Identificateur de l’enregistrement	f6117b0a-d370-471c-9df7-3bfebbd3c926
Enregistrement créé	2022-01-21
Enregistrement modifié	2022-01-21

Date de modification :: 2024-07-04