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Microelectrode generator-collector systems for electrolytic titration: theoretical and practical considerations.

Christopher G Bell1, Parinya Seelanan, Danny O'Hare

  • 1Department of Bioengineering, Imperial College, London SW7 2BP, UK. d.hare@imperial.ac.uk.

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This study introduces a new theory for electrochemical generator-collector systems, revealing a maximum reagent flux constraint crucial for accurate sensing applications like acid-base titrations.

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Sensor Technology

Background:

  • Electrochemical generator-collector systems offer broad applications in sensing and measurement.
  • Existing theoretical models may not fully capture the behavior of specific configurations.

Purpose of the Study:

  • To develop a new theoretical description for coplanar microelectrode disc-disc generator-collector systems.
  • To analyze systems where the collector is passive and the generator operates at constant flux.
  • To model reversible reactions in solution, exemplified by acid-base titration with hydrogen ion generation.

Main Methods:

  • Developed a theoretical framework for coplanar microelectrode systems.
  • Derived a leading-order solution for systems with reversible solution reactions.
  • Utilized microfabricated devices to experimentally validate the theoretical models.

Main Results:

  • Established a novel theoretical constraint: a maximum reagent flux for these devices.
  • Demonstrated that the collector's response reflects bulk solution properties only when this flux constraint is satisfied.
  • Experimental results with microfabricated devices showed reasonable agreement with the developed theory.

Conclusions:

  • The new theory provides critical insights into the operational limits of electrochemical generator-collector sensors.
  • Understanding the maximum reagent flux is essential for accurate concentration measurements in solution.
  • The findings support the use of these systems in precise analytical measurements, particularly in titration scenarios.