Journal
ELECTROCHIMICA ACTA
Volume 177, Issue -, Pages 264-269Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.03.080
Keywords
Microfluidic fuel cell; Air-breathing cathode; Cylinder anode; Acidic media; Alkaline
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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 Researching Fund [51428601]
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An air-breathing microfluidic fuel cell with a cylinder anode is fabricated and characterized in the acidic and alkaline media. The dynamic behavior of CO2 bubbles is visualized in the acidic media, and its impact on current production is discussed. The effects of electrolyte concentration, reactant flow rate and channel length on the cell performance are also evaluated in the alkaline media. The results show that most of the CO2 bubbles are trapped between the anode and spacer in the acidic media, and the corresponding chronoamperometry curve is well correlated with the bubble movement. Further analysis indicates that the gas bubble improves the internal ohmic resistance by reducing proton conduction. In the alkaline media, the fuel cell yields a much higher performance than the acidic case, and fuel transfer limitation and cathode potential reversal occur at combined low flow rate and high current density. The cell performance is found to be predominated by ohmic resistance at flow rates over 200 mu L min(-1). (C) 2015 Elsevier Ltd. All rights reserved.
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