Powering microbial electrolysis cells by capacitor circuits charged using microbial fuel cell
2012; Elsevier BV; Volume: 229; Linguagem: Inglês
10.1016/j.jpowsour.2012.12.006
ISSN1873-2755
AutoresMarta C. Hatzell, Younggy Kim, Bruce E. Logan,
Tópico(s)Electrochemical sensors and biosensors
ResumoA microbial electrolysis cell (MEC) was powered by a capacitor based energy storage circuit using energy from a microbial fuel cell (MFC) to increase MEC hydrogen production rates compared to that possible by the MFC alone. To prevent voltage reversal, MFCs charged the capacitors in a parallel configuration, and then the capacitors were discharged in series to boost the voltage that was used to power the MECs. The optimal capacitance for charging was found to be ∼0.01 F for each MFC. The use of the capacitor charging system increased energy recoveries from 9 to 13%, and hydrogen production rates increased from 0.31 to 0.72 m3 m−3-day−1, compared to coupled systems without capacitors. The circuit efficiency (the ratio of the energy that was discharged to the MEC to the energy provided to the capacitor from the MFCs) was ∼90%. These results provide an improved method for linking MFCs to MECs for renewable hydrogen gas production.
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