Reduced graphene oxide improves the performance of a methanogenic biocathode

Autor: Carrillo-Peña, D., Mateos González, Raúl, Morán Palao, Antonio, Escapa González, Adrián
Přispěvatelé: Ingenieria Electrica, Escuela de Ingenierias Industrial, Informática y Aeroespacial, Escuela de Ingenierias Industrial e Informatica
Rok vydání: 2022
Předmět:
Zdroj: BULERIA. Repositorio Institucional de la Universidad de León
instname
ISSN: 0016-2361
DOI: 10.1016/j.fuel.2022.123957
Popis: Microbial electrosynthesis (MES), a sub-branch of bioelectrochemical processes, takes advantage of a certain type of electroactive microorganism to produce added value products (such as methane) from carbon dioxide (CO2). The aim of this study is to quantify the benefits of using a carbon felt electrode modified with reduced graphene-oxide (rgoCF) as a methanogenic biocathode. The current density generated by the rgoCF was almost 30% higher than in the control carbon felt electrode (CF). In addition, charge transfer and ohmic resistances were, on average, 50% lower in the rgoCF electrode. These improvements were accompanied by a larger presence of bacteria (31% larger) and archaea (18% larger) in the rgoCF electrode. The microbial communities were dominated by hydrogenotrophic methanogenic archaea (Methanobacterium) and, to a lesser extent, by a low-diversity group of bacteria in both biocathodes. Finally, it was estimated that for a CO2 feeding rate in the range 15–30 g CO2 per m2 of electrode per day, it is possible to produce a high-quality biogas (>95% methane concentration SI
Databáze: OpenAIRE
Externí odkaz: