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Related Experiment Videos

Characterization of a membrane-based, electrochemically driven pumping system using aqueous electrolyte solutions.

Mya A Norman1, Christine E Evans, Anthony R Fuoco

  • 1Department of Chemistry and Biochemistry (215 UCB), University of Colorado at Boulder, Boulder, Colorado 80309, USA.

Analytical Chemistry
|October 1, 2005
PubMed
Summary
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This study details an electrochemically driven pump using porous carbon, iodide/triiodide, and Nafion membranes. The pump

Area of Science:

  • Electrochemistry
  • Fluid Dynamics
  • Materials Science

Background:

  • Electrokinetic flow offers versatile fluid pumping solutions.
  • Electrochemical pumps require efficient electrode and electrolyte systems.

Purpose of the Study:

  • To design and characterize an electrochemically driven pump.
  • To investigate the factors influencing fluid flow rate and reversibility.

Main Methods:

  • Utilized porous carbon electrodes, iodide/triiodide redox electrolytes, and Nafion membranes.
  • Employed chronopotentiometry to analyze pumping behavior.
  • Varied electrolyte concentration and cation type.

Main Results:

  • Fluid pumping was reversible and controlled by cell current.

Related Experiment Videos

  • Pumping capacity correlated with electrolyte concentration and current.
  • Flow rates were influenced by cation type and Nafion membrane properties.
  • Observed pumping rates of 1-14 microL/min at 10-30 mA/cm2.
  • Water migration dominated volumetric flow.

    • Conclusions:

    • The developed electrochemical pump is effective and controllable.
    • Electrolyte concentration, current, cation, and membrane properties dictate performance.
    • Migration-induced water flow is the primary driver of volumetric pumping.