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Electricity generation in simulated benthic microbial fuel cell with conductive polyaniline-polypyrole composite hydrogel anode

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  • Xu, Haitao
  • Du, Yanan
  • Chen, Ye
  • Wen, Qing
  • Lin, Cunguo
  • Zheng, Jiyong
  • Qiu, Zhenghui

Abstract

As a sustainable and eco-friendly technology, the benthic microbial fuel cell (BMFC) has been emerged as alternative and potential approach to recover electrical energy by microorganisms, but lower power density and poor long-term life hinder their practical application. Modification of anodic materials is an efficient strategy to solve this problem. Here, a conductive and biocompatible hydrogel electrode, polyaniline-polypyrole-CNTs-Fe3O4 (PANI-PPy-CNTs-Fe3O4) is prepared and applied as anode in a simulated BMFC. The maximum power density of the BMFC with PANI-PPy-CNTs-Fe3O4 hydrogel anode (5901.49 mW/m3) is 1.33, 2.15 and 2.06 times higher than that of PANI-PPy (4413.03 mW/m3), PANI and PPy anodes (2737.12 and 2859.53 mW/m3), respectively. The charge transfer resistance of quaternary hydrogel bioanode in BMFC (3.922 Ω) is much lower than that of the PANI (8.682 Ω), PPy (8.262 Ω) and PANI-PPy (5.772 Ω) hydrogel bioanodes. Moreover, the extracellular electron transfer ability is also enhanced on the composite hydrogel anode, which also exhibits the high biomass. High-throughput sequencing technology indicates that the synergistic effect of bacteria on the quaternary hydrogel made full use of organic matter as available fuel to enable a high electricity-generation anode. Such foregoing mainly ascribed to the composite hydrogel keep the high biocompatibility from components, while the addition of CNTs and Fe3O4 dramatically decreases the internal resistance and provides more electrochemical active surface area on basis of macroporous 3D hydrogel structure. This work explores the composite hydrogel used as anodes to construct high-performance BMFC and provides significant information for the applications of actual BMFCs in the future.

Suggested Citation

  • Xu, Haitao & Du, Yanan & Chen, Ye & Wen, Qing & Lin, Cunguo & Zheng, Jiyong & Qiu, Zhenghui, 2022. "Electricity generation in simulated benthic microbial fuel cell with conductive polyaniline-polypyrole composite hydrogel anode," Renewable Energy, Elsevier, vol. 183(C), pages 242-250.
    • Handle: RePEc:eee:renene:v:183:y:2022:i:c:p:242-250
    DOI: 10.1016/j.renene.2021.10.098
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    References listed on IDEAS

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    1. Mohamed, Hend Omar & Talas, Sawsan Abo & Sayed, Enas T. & Park, Sung-Gwan & Eisa, Tasnim & Abdelkareem, Mohammad Ali & Fadali, Olfat A. & Chae, Kyu-Jung & Castaño, Pedro, 2021. "Enhancing power generation in microbial fuel cell using tungsten carbide on reduced graphene oxide as an efficient anode catalyst material," Energy, Elsevier, vol. 229(C).
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    4. Wang, Yuyang & Zhu, Lin & An, Lijuan, 2020. "Electricity generation and storage in microbial fuel cells with porous polypyrrole-base composite modified carbon brush anodes," Renewable Energy, Elsevier, vol. 162(C), pages 2220-2226.
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