▎ 摘　　要

BACKGROUND The extracellular electron transfer (EET) between microbes and electrodes modified by graphene-based functional material has attracted increasing attention. EET is an important process through which the anode can act as the acceptor for the electrons produced via microbial respiration, and it also plays a key role in organic matter degradation and nutrient cycling in the environment. RESULTS Our results showed that the interaction between microbes and carbon felt (CF) electrodes decorated with bio-reduced graphene oxide (GO-br) was significantly enhanced compared to that between the unmodifiedCFelectrode and microbes. The promoted biological current production and cyclic voltammetric (CV) current response indicated the considerable electro-activity of the GO-br-CFelectrode. diffusion resistance (R-dif) of the GO-br-CFelectrode decreased significantly by 97.3% from 2.76 x 10(5) +/- 7644 omega at the initial incubation stage to 7341 +/- 1322 omega after 58 h of incubation time for GO-br decoration. We also noticed that the GO-br-CFelectrode intermittently poised at +0.1 V (vsAg/AgCl/KCl sat.) was favorable for EET. The GO-br-CFelectrode, which enhanced MFC performance significantly, was further used as the anode in a microbial fuel cell (MFC). CONCLUSION Overall, the results of this study indicated the decoration ofCFelectrode with GO-br could regulate the electrochemical activity of the electrode and the EET process between the microbes and electrode. The elevated electrochemical activity and EET were attributed to the rapid decrease in the diffusion resistance (R-dif) of the GO-br-CFelectrode.