Effects of brush-anode configurations on performance and electrochemistry of microbial fuel cells

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>For practical implementation of MFC, increasing power generation is important because it is closely related with energy production rate and wastewater treatability. However, it is not known which relative arrangement of anode and cathode gives the best performance, and it is necessary to know electrochemical reference point of the brush anode for this. Five different brush-anode configurations were tested in a single-chambered cubic MFC. By merely changing a brush anode configuration, power and current densities were increased by 20% and 30%, respectively. The horizontally-positioned anode configuration (H1) with the closest anode-cathode distance produced the highest power and current. EIS showed that anode impedance and full-cell impedance were decreased by 60% and 49%, respectively. CE and EE were not significantly affected by the anode-cathode distance, but the horizontal type cells showed relatively higher CE, EE and COD removal rate and shorter batch time. The center of a titanium current collector and the center of carbon fibers of a brush-anode were found to be statistically-significant reference points for MFC electrochemistry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> By merely changing anode configuration, P<SUB>max</SUB> increased by 20%. </LI> <LI> By merely changing anode configuration, I<SUB>opt</SUB> increased by 30%. </LI> <LI> Anode impedance and full-cell impedance decreased by 60% and 49%, respectively. </LI> <LI> The horizontal anode with closest electrode distance produced the highest power and current. </LI> <LI> The center of a titanium current collector and the center of carbon fibers were statistically-significant reference points. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>