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<p>The slow cathodic oxygen reduction rate (ORR) of microbial fuel cells (MFCs) is still one of the main bottlenecks in its industrialization. As an ORR catalyst, metal oxides are expected to significantly enhance ORR efficiency by providing active sites, regulating reaction pathways, and enhancing stability. In this paper, four bimetallic oxide catalysts, CuO/Co<sub>3</sub>O<sub>4</sub>, CuO/MnO<sub>2</sub>, CuO/NiO, and CuO/Fe<sub>2</sub>O<sub>3</sub>, were synthesized by sol–gel method, and their structural characteristics were characterized. The results showed that CuO/Co<sub>3</sub>O<sub>4</sub> exhibited the largest specific surface area and optimized pore structure, and the synergistic effect of Cu and Co significantly improved the electrochemical performance. As the cathode catalyst of MFCs, CuO/Co<sub>3</sub>O<sub>4</sub> shows high ORR catalytic activity, low charge transfer resistance, and good stability. In MFCs application, CuO/Co<sub>3</sub>O<sub>4</sub> catalyst achieved the maximum power density of 227&#xa0;mW&#xa0;m<sup>−2</sup>. In the five-cycle test, the output voltage is stable at about 240&#xa0;mV, and the COD removal rate reaches 91.9%, which shows great application potential in wastewater treatment.</p>

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Screening and optimization of Cu-based bimetallic oxide cathode catalysts and their study on the electricity generation effect in microbial fuel cells

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Hua Liu,
  • Chenxin Wang,
  • Cheng Li,
  • Xuan Yang,
  • Cong Li,
  • Zhi Song

摘要

The slow cathodic oxygen reduction rate (ORR) of microbial fuel cells (MFCs) is still one of the main bottlenecks in its industrialization. As an ORR catalyst, metal oxides are expected to significantly enhance ORR efficiency by providing active sites, regulating reaction pathways, and enhancing stability. In this paper, four bimetallic oxide catalysts, CuO/Co3O4, CuO/MnO2, CuO/NiO, and CuO/Fe2O3, were synthesized by sol–gel method, and their structural characteristics were characterized. The results showed that CuO/Co3O4 exhibited the largest specific surface area and optimized pore structure, and the synergistic effect of Cu and Co significantly improved the electrochemical performance. As the cathode catalyst of MFCs, CuO/Co3O4 shows high ORR catalytic activity, low charge transfer resistance, and good stability. In MFCs application, CuO/Co3O4 catalyst achieved the maximum power density of 227 mW m−2. In the five-cycle test, the output voltage is stable at about 240 mV, and the COD removal rate reaches 91.9%, which shows great application potential in wastewater treatment.