Abstract
Methane is a widely available energy resource that can be obtained biologically as well as via natural gas. However, using methane as a fuel in low-temperature fuel cells has been a challenge due to the high thermodynamic stability of methane. In the current study, the feasibility of utilizing methane in a low-temperature microbial fuel cell (MFC) containing a pure culture of Methylococcus capsulatus without the addition of any supplementary electron mediators was studied. Two salt bridge fuel cell configurations were successfully operated. Electrochemical Impedance Spectroscopic studies showed that the biofilm on the anode took approximately one day to stabilize and continued to operate at full power for 7 test days. This work demonstrates the possibility of generating electricity using methane as the sole carbon source at room temperature with M. capsulatus pure culture as a direct electron-transporting MFC biocatalyst.
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