Electrochemical characteristics of microbe reduced graphene modified carbon felt electrodes
ZHENG Fei1,2, ZHU Wei-huang1,2, GAO Hao-xiang1,2
1. Key Laboratory of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055;
2. Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055
In the current study, electrochemical characteristics of interaction between Shewanella putrefaciens ATCC 8071 and self-assembled 3D bio-reduced GO (3D-br-GO) modified carbon felt electrodes driven by biological respiration were investigated, and the effect of +0.1V (vs. Ag/AgCl) potential applied to the bioelectrode on the interaction was further explored. X-ray diffraction showed that GO was reduced to br-GO driven by microbial respiration. SEM images showed a large number of br-GO/bacteria composites shaped on the GO-modified electrode surface, which indicated that the br-GO had good biocompatibility, and the self-assembled 3D-br-GO modified electrode could increase its specific surface area and bacterial loading capacity. By monitoring of electricity production during biofilm growth, and testing of cyclic voltammetry, the results showed that the modification of GO was beneficial for the bacteria to attach onto the electrode in order to form active biofilm and enhanced the electron transfer between microbe and electrode. Whereas, the applied potential of +0.1V (vs. Ag/AgCl) on the GO modified electrode resulted in only a small quantity of bacteria colonized on the electrode, and no formed active biofilm. The electron transfer behavior between the microbe and the electrode was significantly reduced, indicating that the applied potential of +0.1V (vs. Ag/AgCl) may inhibit the growth of microorganisms on the electrode surface.
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