4.6 Article

Step-feed strategy enhances performance of unbuffered air-cathode microbial fuel cells

期刊

RSC ADVANCES
卷 7, 期 54, 页码 33961-33966

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra03769d

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资金

  1. National Science Foundation for Young Scientists of China [51606022]
  2. National Natural Science Funds for Distinguished Young Scholar [51325602]
  3. National Natural Science Funds for Outstanding Young Scholar [51622602]
  4. Fundamental Research Funds for the Central Universities [106112016CDJXY145504]
  5. U.S. Army Research Office [W911NF-11-1-0531]

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Step-feed anolyte recirculation is compared with single-inlet recirculation feed in a single-chamber aircathode microbial fuel cell (MFC) under buffer-less conditions, to examine the effects of distributing the organic load and cathodically increased electrolyte pH across the anode. The step-feed effects on proton transfer, maximum power output, and chemical oxygen demand removal are investigated. The results show that better proton transfer could be induced by using a step-feed configuration with uniform flow distribution across four anode sections of MFCs. Thus, the maximal power density is increased from 3.5 W m(-3) to 4.12 W m(-3), indicating a 17.7% increase in the maximum power density. A slight increase (9.9%) is obtained in coulombic efficiency (CE, 11.1%). Additional 5.1% increases in power (4.33 W m(-3)) and 15% increases in CE (approximately 12.5%) are observed after increasing the flow distribution toward the anode section closest to the cathode. This study demonstrates that step-feed could be a beneficial operational strategy for future MFC designs.

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