OPEN ACCESS
The aim of this work was to design and characterize a novel, multiface parallelepiped MFC in the perspective of decreasing the internal resistance (Rint) and increasing the volumetric power (Pv) output. The cell was fitted with a ‘sandwich’ cathode-membrane-anode assemblage in five of its faces, and possessed a ratio electrode surface area-to-volume ξ (csi) of 19 m-1 . When the 5 faces of the MFC-P were connected in series, the Rint was 601 Ω with a voltage of 0.52 V. Characterization of the cell with the 5 faces connected in parallel gave a Rint of 62 Ω with a voltage of 0.5 V that corresponded to external resistance of 56 k Ω in the polarization procedure. This result was ascribed to both the changes in cell architecture and decrease of the inter-electrode distance as well as the parallel connection. The Pv of the new MFC-P achieved values of 62 and 570 mW/m3 for series and parallel connection, respectively. Molecular ecological techniques were used to analyze the bacterial diversity of biocatalyst used in new design MFC-P. They showed a low species richness and low-to-moderate evenness. The community consisted primarily of δ-Proteobacteria and Firmicutes, bacteria that are recognized to be capable of exocellular electron transfer.
internal resistance, microbial fuel cell, parallel. parallepiped, series
The authors wish to thank the Editors and Referees of JNMES, as well as the Chair and Referees of the Publications Committee of the SMH, for their careful reading of our MS and their insightful comments. CINVESTAV-IPN and ICYTDF, Mexico provided financial support to this reserch. Areli del C. Ortega-Martinez re-ceived a graduate scholarship from CONACYT, Mexico. The ex-cellent technical help with molecular biology analysis of Ms Ana Lilia Tirado-Chamú (BSBiochemEng) from IBT-UNAM, and personnel of Environmental of Biotechnology and Renewable En-ergy R&D Group CINVESTAV-IPN is appreciated. Dr. Gerardo Vazquez-Huerta from the Fuel Cell and Hydrogen Group assisted with the EIS determinations.
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