کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
680138 | 1459964 | 2015 | 9 صفحه PDF | دانلود رایگان |
• Anolyte recirculation was tested in air-cathode MFCs to enhance proton transfer.
• Identical reactors were operated either with or without phosphate buffer.
• The bufferless MFC had 10% lower maximum power and 64% higher Coulombic efficiency.
• Higher recirculation flow rates enhanced proton transfer in the bufferless MFC.
• A high flow rate decreased overall performance due to excess oxygen in the anode.
Two identical microbial fuel cells (MFCs) with a floating air-cathode were operated under either buffered (MFC-B) or bufferless (MFC-BL) conditions to investigate anolyte recirculation effects on enhancing proton transfer. With an external resistance of 50 Ω and recirculation rate of 1.0 ml/min, MFC-BL had a 27% lower voltage (9.7% lower maximal power density) but a 64% higher Coulombic efficiency (CE) than MFC-B. MFC-B had a decreased voltage output, batch time, and CE with increasing recirculation rate resulting from more oxygen transfer into the anode. However, increasing the recirculation rate within a low range significantly enhanced proton transfer in MFC-BL, resulting in a higher voltage output, a longer batch time, and a higher CE. A further increase in recirculation rate decreased the batch time and CE of MFC-BL due to excess oxygen transfer into anode outweighing the proton-transfer benefits. The unbuffered MFC had an optimal recirculation rate of 0.35 ml/min.
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Journal: Bioresource Technology - Volume 179, March 2015, Pages 26–34