title: Analysis of oxygen reduction and microbial community of air-diffusion biocathode in microbial fuel cells.
abstract: Microbes play irreplaceable role in oxygen reduction reaction of biocathode in microbial fuel cells (MFCs). In this study, air-diffusion biocathode MFCs were set up for accelerating oxygen reduction and microbial community analysis. Linear sweep voltammetry and Tafel curve confirmed the function of cathode biofilm to catalyze oxygen reduction. Microbial community analysis revealed higher diversity and richness of community in plankton than in biofilm. Proteobacteria was the shared predominant phylum in both biofilm and plankton (39.9% and 49.8%) followed by Planctomycetes (29.9%) and Bacteroidetes (13.3%) in biofilm, while Bacteroidetes (28.2%) in plankton. Minor fraction (534, 16.4%) of the total operational taxonomic units (3252) was overlapped demonstrating the disproportionation of bacterial distribution in biofilm and plankton. Pseudomonadales, Rhizobiales and Sphingobacteriales were exoelectrogenic orders in the present study. The research obtained deep insight of microbial community and provided more comprehensive information on uncultured rare bacteria.
authors.affiliation: Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian Province 361021, China.
authors.forename: Zejie
authors.initials: Z
authors.lastname: Wang
authors.forename: Yue
authors.initials: Y
authors.lastname: Zheng
authors.forename: Yong
authors.initials: Y
authors.lastname: Xiao
authors.forename: Song
authors.initials: S
authors.lastname: Wu
authors.forename: Yicheng
authors.initials: Y
authors.lastname: Wu
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Yang
authors.forename: Feng
authors.initials: F
authors.lastname: Zhao
mesh_terms: D000388:Air; D001419:Bacteria / Q000378:metabolism*; D044822:Biodiversity; D001674:Bioelectric Energy Sources / Q000382:microbiology*; D018441:Biofilms; D004058:Diffusion; D055664:Electrochemical Techniques; D004566:Electrodes; D010084:Oxidation-Reduction; D010100:Oxygen / Q000378:metabolism*; D010802:Phylogeny
chemical_list: D010100:Oxygen
keywords: 454-Pyrosequencing; Biocathode; Microbial community; Microbial fuel cells