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The interaction between microbes and electrodes decorated with bio‐reduced graphene oxide— from an electrochemical point of view
Author(s) -
Zhu Weihuang,
Gao Haoxiang,
li Peng,
Li Yaqi,
Zhang Jianfeng,
Bai Huiling
Publication year - 2021
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6524
Subject(s) - electrode , graphene , anode , electrochemistry , electron acceptor , oxide , microbial fuel cell , materials science , standard hydrogen electrode , electron transfer , chemical engineering , chemistry , nanotechnology , reference electrode , inorganic chemistry , photochemistry , metallurgy , engineering
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 unmodified CF electrode and microbes. The promoted biological current production and cyclic voltammetric (CV) current response indicated the considerable electro‐activity of the GO‐br‐ CF electrode. diffusion resistance (R dif ) of the GO‐br‐ CF electrode decreased significantly by 97.3% from 2.76 × 10 5 ± 7644 Ω at the initial incubation stage to 7341 ± 1322 Ω after 58 h of incubation time for GO‐br decoration. We also noticed that the GO‐br‐ CF electrode intermittently poised at +0.1 V ( vs Ag/AgCl/KCl sat.) was favorable for EET. The GO‐br‐ CF electrode, 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 of CF electrode 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‐ CF electrode.