Cauliflower‐like polypyrrole@MnO₂ modified carbon cloth as a capacitive anode for high‐performance microbial fuel cells
Xiaohua Zhao, Tian Tian, Min Guo, Xin Liu +1
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70% confidenceA cauliflower-like polypyrrole@MnO2 composite is fabricated on a carbon cloth anode to enhance power production and storage in microbial fuel cells, achieving a power density of 2139.7 ± 17.5 mW m⁻² and an areal capacitance of 1120 ± 12.8 mF cm⁻².
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Abstract
Abstract BACKGROUND The morphology and size of MnO 2 that deposited on a carbon clothelectrode have dramatic effects on the electrochemical properties and cycling life. Currently, MnO 2 and its composite structures with zero‐dimensional (0D) nanospheres, one‐dimension (1D) nanotubes and two‐dimension (2D) nanomesh have been successfully synthesized and employed in MFC. Hence, the development of a three‐dimensional (3D) flexible, cost‐effective and high‐performance anode is of great significance for microbial energy harvesting. RESULT Herein, we have fabricated 3D cauliflower‐like polypyrrole@manganese dioxide (PPy@MnO 2 ) composites, which are successfully grown on carbon cloth (CC) anode by electrodeposition to promote the power production and storage in microbial fuel cells (MFCs). Impressively, the as‐prepared PPy@MnO 2 modified CC anode delivers a power density of 2139.7 ± 17.5 mW m −2 and produces an areal capacitance of 1120 ± 12.8 mF cm −2 , which is 3.58 and 4.84 folds higher than that with bare CC anode, benefiting from the unique cauliflower‐like 3D architecture with increased active centers that host the bacteria for more efficient charge transfer. Electrochemical analyses indicate that the PPy@MnO 2 modified CC electrode has excellent electrochemical activity, capacitive behavior and long‐term cyclabilities with smooth surface morphology and high porosity. CONCLUSION These findings not only provide a facile electrodeposition strategy for PPy@MnO 2 nanoflowers modified CC anode, but also demonstrates its potential for the production and storage of energy simultaneously in MFC application. © 2019 Society of Chemical Industry
Key findings
- The morphology and size of MnO2 deposited on a carbon cloth electrode significantly affect electrochemical properties and cycling life.
- A 3D flexible and cost-effective anode is crucial for microbial energy harvesting.
- The as-prepared PPy@MnO2 modified CC anode outperforms existing 0D, 1D, and 2D nanomaterials in MFCs.
Keywords
Identifiers
- Journal
- Journal of Chemical Technology & Biotechnology
- Year
- 2019