Planar and three-dimensional microfluidic fuel cell architectures based on graphite rod electrodes |
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Authors: | Erik Kjeang Jonathan McKechnieDavid Sinton Ned Djilali |
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Affiliation: | Department of Mechanical Engineering, and Institute for Integrated Energy Systems (IESVic), University of Victoria, P.O. Box 3055 STN CSC, Victoria, BC V8W 3P6, Canada |
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Abstract: | We propose new membraneless microfluidic fuel cell architectures employing graphite rod electrodes. Commonly employed as mechanical pencil refills, graphite rods are inexpensive and serve effectively as both electrode and current collector for combined all-vanadium fuel/oxidant systems. In contrast to film-deposited electrodes, the geometry and mechanical properties of graphite rods enable unique three-dimensional microfluidic fuel cell architectures. Planar microfluidic fuel cells employing graphite rod electrodes are presented here first. The planar geometry is typical of microfluidic fuel cells presented to date, and permits fuel cell performance comparisons and the evaluation of graphite rods as electrodes. The planar cells produce a peak power density of 35 mW cm−2 at 0.8 V using 2 M vanadium solutions, and provide steady operation at flow rates spanning four orders of magnitude. Numerical simulations and empirical scaling laws are developed to provide insight into the measured performance and graphite rods as fuel cell electrodes. |
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Keywords: | Microfluidic fuel cell Membraneless fuel cell Laminar flow-based fuel cell Vanadium redox couple Graphite rod Array architecture fuel cell |
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