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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Published on: November 11, 2013

Pressure-driven bipolar electrochemistry.

Ioana Dumitrescu1, Robbyn K Anand, Stephen E Fosdick

  • 1Department of Chemistry and Biochemistry, Center for Electrochemistry, Center, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas 78712-0165, USA.

Journal of the American Chemical Society
|March 17, 2011
PubMed
Summary
This summary is machine-generated.

Pressure-driven flow in microchannels can power electrochemical reactions without external electricity. This flow generates significant streaming potentials, sufficient to drive reactions at a bipolar electrode, as evidenced by silver electrodissolution.

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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
08:41

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Published on: September 7, 2018

Area of Science:

  • Electrochemistry
  • Fluid dynamics
  • Microfluidics

Background:

  • Microfluidic devices often require external power sources for electrochemical reactions.
  • Charged channel walls can influence fluid behavior and electrical phenomena.

Purpose of the Study:

  • To investigate if pressure-driven flow alone can initiate and sustain faradaic electrochemical reactions in microchannels.
  • To demonstrate the generation of streaming potentials by fluid flow and their application in electrochemistry.

Main Methods:

  • Utilizing microchannels with charged walls.
  • Employing pressure-driven fluid flow to induce streaming potentials.
  • Using a bipolar electrode (BPE) to facilitate electrochemical reactions.
  • Analyzing the electrodissolution of silver (Ag) as evidence of anodic reactions.

Main Results:

  • Solution flow in charged microchannels generates streaming potentials on the order of volts.
  • These streaming potentials are sufficient to drive faradaic electrochemical reactions at the BPE.
  • Electrodissolution of silver from the anodic end of the BPE confirms the occurrence of electrochemical reactions.

Conclusions:

  • Pressure-driven flow is a viable method to power electrochemical reactions in microfluidic systems.
  • This approach offers a potential pathway for energy-efficient electrochemical applications in microchannels.
  • Streaming potentials generated by fluid flow can be harnessed for electrochemical energy conversion.