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Optimizing biochar and conductive carbon black composites as cathode catalysts for microbial fuel cells to improve isopropanol removal and power generation

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  • Liu, Shu-Hui
  • You, Shang-Sian
  • Lin, Chi-Wen
  • Cheng, Yu-Shen

Abstract

A cathodic metal-based catalyst in a microbial fuel cell (MFCs) is costly so alternative carbon-based materials, such as biochar, are favored. Biochar that is obtained from agricultural waste (peanut husks) was combined with high-conductivity conductive carbon black (CCB) to form a cathodic composite catalyst (biochar/CCB). The optimal ratio of biochar/CCB (70% over 30%) and its volume (4.45 cm3) were obtained by response surface methodology (RSM). A cathode catalyst with low resistance (55.1 Ω) and a high reduction peak current (7.26 μA) was developed with an overall regression model explanatory power (R2) >0.95. Following the optimal biochar/CCB modification, the removal efficiency, voltage output, power density and Coulombic efficiency of the MFC were 6.91–21.6%, 1.82, 2.47 and 2.56 times higher, respectively, than those of a carbon MFC without a catalyst. The microbial community of the anode indicates that the cathode modified by biochar/CCB can promote the growth of electrogenic and degrading bacteria to achieve improved power production and pollutant removal efficiency. This result demonstrates that the optimized biochar/CCB in this study has great potential for subsequent use in pollutant treatment and power generation systems.

Suggested Citation

  • Liu, Shu-Hui & You, Shang-Sian & Lin, Chi-Wen & Cheng, Yu-Shen, 2022. "Optimizing biochar and conductive carbon black composites as cathode catalysts for microbial fuel cells to improve isopropanol removal and power generation," Renewable Energy, Elsevier, vol. 199(C), pages 1318-1328.
    • Handle: RePEc:eee:renene:v:199:y:2022:i:c:p:1318-1328
    DOI: 10.1016/j.renene.2022.09.069
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    References listed on IDEAS

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    1. Liu, Shu-Hui & Fu, Sih-Hua & Chen, Chia-Ying & Lin, Chi-Wen, 2020. "Enhanced processing of exhaust gas and power generation by connecting mini-tubular microbial fuel cells in series with a biotrickling filter," Renewable Energy, Elsevier, vol. 156(C), pages 342-348.
    2. Zhong, Kengqiang & Li, Meng & Yang, Yue & Zhang, Hongguo & Zhang, Bopeng & Tang, Jinfeng & Yan, Jia & Su, Minhua & Yang, Zhiquan, 2019. "Nitrogen-doped biochar derived from watermelon rind as oxygen reduction catalyst in air cathode microbial fuel cells," Applied Energy, Elsevier, vol. 242(C), pages 516-525.
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    Cited by:

    1. Liu, Zhiyuan & Li, Yan & Sun, Yong & Feng, Fang & Tagawa, Kotaro, 2023. "Preparation of biochar-based photothermal superhydrophobic coating based on corn straw biogas residue and blade anti-icing performance by wind tunnel test," Renewable Energy, Elsevier, vol. 210(C), pages 618-626.

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