Abstract
This study demonstrates a novel approach for combined energy carrier production and energy storage in a Microbial Electrosynthesis System (MES). Continuous production of high purity methane (CH4) from carbon dioxide (CO2) was achieved in a 0.65 L carbon felt - filled cathode compartment of a membraneless MES. CH4 production reached 0.72 L d−1 at an energy consumption of 26 Wh LCH4−1. Owing to the membraneless design of the MES, pH control of the electrode compartments was not required, with the cathode compartment pH remaining below 8.5. Electrochemical characterization showed a progressive increase of the MES internal capacitance from 2.1 F to 3.2 F. Bioelectrochemical conversion of CO2 to CH4 can be used for long-term energy storage (power-to-gas conversion) combined with CO2 sequestration, while the internal capacitance of electroactive biofilms can be exploited to develop bioelectrochemical supercapacitors for fast energy return to the electrical grid.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have