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Electricity generation and recovery of iron hydroxides using a single chamber fuel cell with iron anode and air-cathode for electrocoagulation

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  • Kim, Jung Hwan
  • Park, I Seul
  • Park, Joo Yang

Abstract

The use of a single chamber fuel cell with an iron anode and air cathode is a new and innovative concept in electrocoagulation. In this study, we investigated the predominant reactions that contribute to the production of electricity and iron hydroxides in solution. Solutions composed of 0.06M NaHCO3 and 0.05M NaCl at an initial pH of 5 were determined to be optimal for producing the maximum power density of 1997mW/m2 after 24h. Increases in the bicarbonate concentration and ionic strength of the solution induced a corresponding decrease in the anode potential and increase in the cathode potential, which resulted in an increase in the cell potential and power density. Further, increasing the NaHCO3 concentration to 0.1M and the ionic strength of the solution to 0.56M induced an increase in the maximum power densities to 2436 and 4343mW/m2, respectively. Initial pH values of 7.5 and 8.5 in solutions containing 0.06M NaHCO3 and 0.05M NaCl were employed to synthesize magnetic iron hydroxides including magnetite and maghemite. These results suggest that this fuel cell technology can be used not only for electrocoagulation with the removal of contaminants, but also for producing useful products such as electricity and magnetic iron hydroxides. Advances in waste water air-metal fuel cells will enable more efficient power generation and systems suitable for scale-up.

Suggested Citation

  • Kim, Jung Hwan & Park, I Seul & Park, Joo Yang, 2015. "Electricity generation and recovery of iron hydroxides using a single chamber fuel cell with iron anode and air-cathode for electrocoagulation," Applied Energy, Elsevier, vol. 160(C), pages 18-27.
    • Handle: RePEc:eee:appene:v:160:y:2015:i:c:p:18-27
    DOI: 10.1016/j.apenergy.2015.09.041
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    References listed on IDEAS

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    1. Mahmood, Asad & Hwan Kim, Jung & Park, Jae-Woo, 2021. "Application of metal-air fuel cell electrocoagulation for the harvesting of Nannochloropsis salina marine microalgae," Renewable Energy, Elsevier, vol. 171(C), pages 1224-1235.

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