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Energies 2015, 8(3), 2082-2096; doi:10.3390/en8032082

Fabrication and Test of an Air-Breathing Microfluidic Fuel Cell

1
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan
2
Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan
3
Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
4
Department of Mechanical Engineering, R.O.C. Military Academy, Kaohsiung 83059, Taiwan
5
Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Andrés G. Muñoz
Received: 18 January 2015 / Revised: 23 February 2015 / Accepted: 5 March 2015 / Published: 16 March 2015
View Full-Text   |   Download PDF [3094 KB, uploaded 17 March 2015]   |  

Abstract

An air-breathing direct formic acid microfluidic fuel cell, which had a self-made anode electrode of 10 mg/cm2 Pd loading and 6 mg/cm2 Nafion content, was fabricated and tested. The microfluidic fuel cell was achieved by bonding a PDMS microchannel that was fabricated by a soft-lithography process and a PMMA sheet that was machined by a CO2 laser for obtaining 50 through holes of 0.5 mm in diameter. Formic acid of 0.3 M, 0.5 M, and 1.0 M, mixed with 0.5-M H2SO4, was supplied at a flow rate ranging from 0.1 to 0.7 mL/min as fuel. The maximum power density of the fuel cell fed with 0.5-M HCOOH was approximately 31, 32.16, and 31 mW/cm2 at 0.5, 0.6, and 0.7 mL/min, respectively. The simultaneous recording of the flow in the microchannel and the current density of the fuel cell at 0.2 V, within a 100-s duration, showed that the period and amplitude of each unsteady current oscillation were associated with the bubble resident time and bubble dimension, respectively. The effect of bubble dimension included the longitudinal and transverse bubble dimension, and the distance between two in-line bubbles as well. View Full-Text
Keywords: air-breathing; fuel cell; formic acid; bubble resident time air-breathing; fuel cell; formic acid; bubble resident time
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Shyu, J.-C.; Wang, P.-Y.; Lee, C.-L.; Chang, S.-C.; Sheu, T.-S.; Kuo, C.-H.; Huang, K.-L.; Yang, Z.-Y. Fabrication and Test of an Air-Breathing Microfluidic Fuel Cell. Energies 2015, 8, 2082-2096.

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