Ohmic resistance affects microbial community and electrochemical kinetics in a multi-anode microbial electrochemical cell

JOURNAL OF POWER SOURCES

卷:331

Article

Dhar, Bipro Ranjan¹  Ryu, Hodon²  Domingo, Jorge W. Santo²  Lee, Hyung-Sool¹ 

[1] Univ Waterloo, Dept Civil & Environm Engn, 200 Univ Ave West, Waterloo, ON N2L 3G1, Canada

[2] US EPA, Natl Risk Management Res Lab, 26 W Martin Luther King Dr, Cincinnati, OH 45268 USA

关键词: Anode potential;    Geobacter;    Half-saturation anode potential;    Microbial electrochemical cells;    Multi-anode;    Ohmic energy loss;   

DOI  :  10.1016/j.jpowsour.2016.09.055

来源: Elsevier

【 摘 要 】

Multi-anode microbial electrochemical cells (MxCs) are considered as one of the most promising configurations for scale-up of MxCs, but understanding of anode kinetics in multiple anodes is limited in the MxCs. In this study we assessed microbial community and electrochemical kinetic parameters for bio-films on individual anodes in a multi-anode MxC to better comprehend anode fundamentals. Microbial community analysis targeting 16S rRNA Illumina sequencing showed that Geobacter genus was abundant (87%) only on the biofilm anode closest to a reference electrode (low ohmic energy loss) in which current density was the highest among three anodes. In comparison, Geobacter populations were less than 1% for biofilms on other two anodes distant from the reference electrode (high ohmic energy loss), generating small current density. Half-saturation anode potential (E-KA) was the lowest at -0.251 to -0.242 V (vs. standard hydrogen electrode) for the closest biofilm anode to the reference electrode, while E-KA was as high as -0.134 V for the farthest anode. Our study proves that electric potential of individual anodes changed by ohmic energy loss shifts biofilm communities on individual anodes and consequently influences electron transfer kinetics on each anode in the multi-anode MxC. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free