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Innovative Cost-Effective Nano-NiCo 2 O 4 Cathode Catalysts for Oxygen Reduction in Air–Cathode Microbial Electrochemical Systems

Author

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  • Qixing Zhou

    (MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China)

  • Ruixiang Li

    (MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China)

  • Xiaolin Zhang

    (MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China)

  • Tian Li

    (MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China)

Abstract

Microbial electrochemical systems (MESs) can harvest bioelectricity from varieties of organic matter in wastewater through electroactive microorganisms. Oxygen reduction reaction (ORR) in a cathode plays an important role in guaranteeing high power generation, which can be enhanced by cathode catalysts. Herein, the tiny crystalline grain nanocrystal NiCo 2 O 4 is prepared via the economic method and utilized as an effective catalyst in air–cathode MESs. The linear sweep voltammetry results indicate that the current density of 2% nano-NiCo 2 O 4 /AC cathode (5.05 A/m 2 ) at 0 V increases by 20% compared to the control (4.21 A/m 2 ). The cyclic voltammetries (CVs) and the electrochemical impedance spectroscopy (EIS) showed that the addition of nano-NiCo 2 O 4 (2%) is efficient in boosting the redox activity. The polarization curves showed that the MESs with 2% nano-NiCo 2 O 4 /AC achieved the highest maximum power density (1661 ± 28 mW/m 2 ), which was 1.11 and 1.22 times as much as that of AC and 5% nano-NiCo 2 O 4 . Moreover, the adulteration of nano-NiCo 2 O 4 with a content of 2% can not only enable the electrical activity of the electrode to be more stable, but also reduce the cost for the same power generation in MESs. The synthetic nano-NiCo 2 O 4 undoubtedly has great benefits for large-scale MESs in wastewater treatment.

Suggested Citation

  • Qixing Zhou & Ruixiang Li & Xiaolin Zhang & Tian Li, 2022. "Innovative Cost-Effective Nano-NiCo 2 O 4 Cathode Catalysts for Oxygen Reduction in Air–Cathode Microbial Electrochemical Systems," IJERPH, MDPI, vol. 19(18), pages 1-11, September.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:18:p:11609-:d:915399
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    References listed on IDEAS

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    1. Jayabalan, Tamilmani & Manickam, Matheswaran & Naina Mohamed, Samsudeen, 2020. "NiCo2O4-graphene nanocomposites in sugar industry wastewater fed microbial electrolysis cell for enhanced biohydrogen production," Renewable Energy, Elsevier, vol. 154(C), pages 1144-1152.
    2. Li, Tian & Zhou, Lean & Qian, Yawei & Wan, Lili & Du, Qing & Li, Nan & Wang, Xin, 2017. "Gravity settling of planktonic bacteria to anodes enhances current production of microbial fuel cells," Applied Energy, Elsevier, vol. 198(C), pages 261-266.
    3. Tajdid Khajeh, Rana & Aber, Soheil & Zarei, Mahmoud, 2020. "Comparison of NiCo2O4, CoNiAl-LDH, and CoNiAl-LDH@NiCo2O4 performances as ORR catalysts in MFC cathode," Renewable Energy, Elsevier, vol. 154(C), pages 1263-1271.
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