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Carbonized microcellular foam-based porous flow-through electrodes with unit coulometric efficiency

B K Davis1, S G Weber

  • 1Department of Chemistry, University of Pittsburgh, Pennsylvania 15260.

Analytical Chemistry
|April 1, 1994
PubMed
Summary

This study highlights the use of polyacrylonitrile (PAN) derived carbon foam in coulometric cells. Optimized foam electrodes demonstrate high coulometric efficiency at flow rates up to 3 mL/min.

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Area of Science:

  • Electrochemistry
  • Materials Science

Background:

  • Carbon foam derived from polyacrylonitrile (PAN) offers high specific surface area (21,000 cm²/g) and porosity (0.97).
  • These properties make it suitable for electrochemical applications, particularly coulometric cells.

Purpose of the Study:

  • To evaluate the performance of PAN-derived carbon foam as an electrode material in micro-volume coulometric cells.
  • To determine optimal electrode dimensions and operating conditions for achieving unit coulometric efficiency.

Main Methods:

  • Carbon foam pyrolyzed from PAN at 1100°C was fabricated into cylindrical segments.
  • Segments were integrated into glass tubing (1.0 mm diameter) to create micro-electrodes.
  • Coulometric efficiency was measured at varying flow rates (up to 3 mL/min).

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Main Results:

  • Micro-electrodes with electrode volumes as small as 0.4 µL achieved unit coulometric efficiency at 1.0 mL/min.
  • Higher flow rates (>1.0 mL/min) led to electrode failure due to pressure.
  • Longer electrodes sustained unit coulometric efficiency up to system limits near 3 mL/min.

Conclusions:

  • PAN-derived carbon foam is a viable material for micro-volume coulometric cells.
  • Optimized electrode design and flow rate management are crucial for high performance.
  • The material's properties enable efficient electrochemical analysis in small sample volumes.