RT info:eu-repo/semantics/article
T1 Charge storage capacity of electromethanogenic biocathodes
A1 Carrillo Peña, Daniela Andrea
A1 Pelaz Guerra, Guillermo
A1 Mateos González, Raúl
A1 Escapa González, Adrián
A2 Fisica Aplicada
K1 Ingeniería química
K1 Biocathodes
K1 Capacitance
K1 Charge storage
K1 Energy storage
K1 3303 Ingeniería y Tecnología Químicas
AB [EN] Methanogenic biocathodes (MB) can convert CO2 and electricity into methane. This feature, that allows them to potentially be used for long-term electrical energy storage, has aroused great interest during the past 10 years. MB can also operate as biological supercapacitors, a characteristic that can be exploited for short-term energy storage and that has received much less attention. In this study, we investigate the electrical charge storage capabilities of carbon-felt-based MB modified with graphene oxide. The charge-discharge experiments revealed that the potential of the electrode plays an important role during the discharging period: low potentials (−1.2 V vs Ag/AgCl) created an inrush of faradaic current that masked any capacitive current. At more positive potentials (−0.8 V vs Ag/AgCl), the biological electrodes were outperformed by the abiotic electrodes, and only when the potential was set at −1.0 V vs Ag/AgCl the graphene-modified biological electrode showed its superior charge storage capacity. Overall, results indicated that the graphene modification is crucial to obtain bioelectrodes with improved capacitance: untreated bioelectrodes showed a charge storage capacity inferior to that measured in the abiotic electrodes.
PB Elsevier
SN 2352-152X
LK https://hdl.handle.net/10612/17449
UL https://hdl.handle.net/10612/17449
NO Carrillo-Peña, D., Pelaz, G., Mateos, R., & Escapa, A. (2024). Charge storage capacity of electromethanogenic biocathodes. Journal of Energy Storage, 76, 109789. https://doi.org/https://doi.org/10.1016/j.est.2023.109789
DS BULERIA. Repositorio Institucional de la Universidad de León
RD 20-may-2024