Journal
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume 50, Issue 12, Pages 1281-1290Publisher
SPRINGER
DOI: 10.1007/s10800-020-01488-z
Keywords
Porous sponge; Microbial fuel cell; Energy storage; Renewable energy; Capacitive anode
Categories
Funding
- National Natural Science Foundation of China [21878060, 21476053]
- Research Fund of State Key Laboratory for Marine Corrosion and Protection of Luoyang Ship Material Research Institute [6142901180401]
- Special plan for young Reserve Talents of Harbin University of Commerce [2019CX30]
- Research Project Fund of Harbin University of Commerce [2019DS082]
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Enhancing anode performance is a critical step to improving the power output and energy storage of microbial fuel cells (MFCs). In this study, MFCs containing pseudocapacitive anode materials, such as polypyrrole-carboxymethyl cellulose (PPy-CMC) composite films, were used to coat the nitrogen-doped carbon nanotube (N-CNT)/sponge (S) for use in MFCs. The capacitive anode could function as a bioanode, store electrons generated from the microbial oxidation of a substrate, and release the accumulated charge as needed. Scanning electron microscopy results indicated that the composite anode had a three-dimensional macroporous structure with a large specific surface area, providing more sites for microbial attachment and growth. Experimental results showed that MFCs equipped with PPy-CMC/N-CNT/S capacitive bioanodes had a maximum power density of 4.88 W m(-3), which was 1.34 and 1.71 times as much as those of PPy/N-CNT/S and N-CNT/S bioanodes (3.65 and 2.85 W m(-3)), respectively. Moreover, the charge-discharge time of 60-90 min, the total charge Q(m) of the MFC equipped with the PPy-CMC/N-CNT/S anode was the largest (5154.08 mC cm(-2))-5.7 times higher than that of the N-CNT/S anode. The excellent performance of the MFC equipped with the PPy-CMC/N-CNT/S anode was attributable to the composite materials, which exhibited a large-pore structure, good biocompatibility, large capacitance, and high specific surface area. Therefore, this synthesized composite exhibited potential as a capacitive and biocompatible anode material in MFCs. [GRAPHICS] .
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