Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 40, Issue 35, Pages 11983-11988Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.04.144
Keywords
Microfluidic; Miniature microbial fuel cells; Laminar flow; Microchannel geometry; Biofilm distribution
Categories
Funding
- National Natural Science Foundation of China [51376203, 51276208]
- National Natural Science Funds for Distinguished Young Scholar [51325602]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20120191110010]
- Fundamental Research Funds for the Central Universities [CDJZR14145502]
- Overseas, Hong Kong & Macao Scholars Collaborated Research Fund [51428601]
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Laminar-flow controlled microfluidic microbial fuel cells (MMFCs) with three different microchannel geometries, including the converging channel, the straight channel and the diverging channel, are presented and investigated. The biofilm distribution along the microchannel is visualized and compared. The effects of microchannel geometry on the start-up process and cell performance are also evaluated. The results show that the MMFC with the diverging channel (MMFC-D) begins to generate current in the shortest time compared with MFCs with the converging channel (MMFC-C) and the straight channel (MMFC-S). Moreover, the maximum power density (2447.7 +/- 38.9 mW m(-2)) of MMFC-D is 429% and 24% higher than that of MMFC-C (462.7 +/- 17.5 mW m(-2)) and MMFC-S (1980.1 +/- 27.5 mW m(-2)), respectively. The high performance of MMFC-D can be explained by the combined effect of the good and uniform attached biofilm and the low anode resistance, which significantly depends on the microchannel geometry. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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