Microbially catalyzed enhanced bioelectrochemical performance using covalent organic framework‐modified anode in a microbial fuel cell

Summary Electrode modification is crucial in improving the power density and bioelectrochemical performance of a microbial fuel cell (MFC). The conventional carbon felt (CF) surface was modified as an anode in this study to examine an emerging class of materials known as covalent organic framework (...

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Published in:International journal of energy research 2022-10, Vol.46 (12), p.17003-17014
Main Authors: Tahir, Khurram, Hussain, Muzammil, Maile, Nagesh, Ghani, Ahsan Abdul, Kim, Bolam, Lee, Dae Sung
Format: Article
Language:English
Subjects:
Analytical methods
anode modification
Anodes
Biochemical fuel cells
covalent organic framework
Electrochemistry
Electrode materials
Electrodes
Fuel cells
Fuel technology
microbial fuel cell
Microorganisms
power density
Spectroscopy
Substrates
TpPa‐1
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Summary:Summary Electrode modification is crucial in improving the power density and bioelectrochemical performance of a microbial fuel cell (MFC). The conventional carbon felt (CF) surface was modified as an anode in this study to examine an emerging class of materials known as covalent organic framework (COF). In a three‐electrode system, the performance of the modified anode (TpPa‐1@CF) was evaluated using various physical and bioelectrochemical techniques, demonstrating superior bioelectrochemical activity (cyclic voltammetry), reduced electrode resistance (electrochemical spectroscopy), and excellent electrode stability (chronoamperometry). With a 4.3 and 12.7‐fold improvement in power (1069 mW/m2) and current (1954 mA/m2) density and steady MFC performance as compared to the uncoated electrode throughout five MFC cycles, TpPa‐1@CF demonstrated better bioelectrochemical activity. Furthermore, the rough electrode surface area and numerous catalytically active sites of TpPa‐1@CF promoted the microbial growth/adhesion along with substrate fluxes yielding the selective enrichment of Proteobacteria and Bacteroidetes (electricity‐producing phyla). These results indicated that TpPa‐1@CF is a promising anode material for several bioelectrochemical applications. A stable TpPa‐1@CF anode was fabricated using a solvothermal and drop‐casting method. TpPa‐1@CF considerably improved both the electrochemical activity and cell performance. The TpPa‐1@CF anode generated 4.3 times the power density than that of the uncoated electrode. Stable and improved current density was observed for all five MFC cycles. Biofilm was enriched with electroactive microorganisms of Proteobacteria and Bacteroidetes.
ISSN:0363-907X
1099-114X
DOI:10.1002/er.8364