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Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells
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A microfluidic fuel cell with flow-through porous electrodes.

Erik Kjeang1, Raphaelle Michel, David A Harrington

  • 1Department of Mechanical Engineering, Institute for Integrated Energy Systems (IESVic), University of Victoria, 3800 Finnerty Road, Victoria, BC, V8W2Y2, Canada.

Journal of the American Chemical Society
|March 5, 2008
PubMed
Summary

This study presents a novel membraneless microfluidic fuel cell using flow-through porous electrodes. The innovative design achieves high power densities and energy efficiency, with potential for in situ regeneration.

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Area of Science:

  • Electrochemistry
  • Chemical Engineering
  • Materials Science

Background:

  • Microfluidic fuel cells offer miniaturization advantages.
  • Traditional designs face limitations in fuel utilization and transport efficiency.
  • Membraneless configurations simplify design but require efficient ion transport.

Purpose of the Study:

  • To demonstrate a novel microfluidic fuel cell architecture with flow-through porous electrodes.
  • To enhance fuel utilization and convective/diffusive transport.
  • To achieve high power densities and energy conversion efficiency in a cost-effective design.

Main Methods:

  • Fabrication of a microfluidic fuel cell using rapid prototyping.
  • Implementation of a cross-flow architecture for vanadium redox species through porous electrodes.
  • Orthogonal co-laminar flow for waste stream management in a membraneless setup.

Main Results:

  • Achieved power densities up to 131 mW cm-2 at room temperature.
  • Demonstrated high overall energy conversion efficiency with 94% fuel utilization at 0.8 V and 1 microL min-1 flow rate.
  • Prototype fuel cells cost approximately 2 USD/unit.

Conclusions:

  • The flow-through porous electrode architecture significantly improves microfluidic fuel cell performance.
  • This design offers a cost-effective and efficient solution for portable energy applications.
  • In situ fuel and oxidant regeneration is feasible by reversing the flow-through architecture.