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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

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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.
The chosen potential...
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Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Pure-Water-Fed Forward-Bias Bipolar Membrane CO2 Electrolyzer.

Matthias Heßelmann1,2, Jason Keonhag Lee1, Sudong Chae1

  • 1Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.

ACS Applied Materials & Interfaces
|May 7, 2024
PubMed
Summary

This study introduces a novel zero-gap carbon dioxide (CO2) electrolyzer using asymmetrical bipolar membranes. This design overcomes CO2 crossover and salt precipitation, enabling efficient and stable CO2 reduction into carbon feedstocks.

Keywords:
asymmetricbipolar membranecell designelectrochemical CO2 reductionforward-biaswater-fed

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Electrochemical reduction of carbon dioxide (CO2) using renewable electricity is a sustainable route for chemical fuel production.
  • Reactor design and operational stability challenges, including CO2 crossover and salt precipitation, hinder widespread CO2 electrolyzer deployment.

Purpose of the Study:

  • To design and optimize a zero-gap CO2 electrolyzer that addresses CO2 crossover and salt precipitation.
  • To achieve high efficiency and stability in CO2 electroreduction for sustainable chemical feedstock production.

Main Methods:

  • Development of an asymmetrical bipolar membrane-based zero-gap CO2 electrolyzer.
  • Optimization of anion-exchange-layer thickness, cathode differential pressure, and cell temperature.
  • Investigation of catalyst and ionomer degradation mechanisms through postmortem analysis.

Main Results:

  • Achieved over 80% CO faradic efficiency and over 200 mA cm-2 partial current density at < 3.0 V.
  • Demonstrated negligible CO2 crossover and low decay rates (0.61 and 2.1 mV h-1 at 150 and 300 mA cm-2).
  • Identified catalyst structural change and ionomer degradation as key decay mechanisms.

Conclusions:

  • The asymmetrical bipolar membrane design effectively solves critical challenges in CO2 electrolyzer operation.
  • Optimized electrolyzer performance shows a promising pathway for large-scale industrial CO2 utilization.
  • Understanding decay mechanisms provides direction for future research and development of durable CO2 electrolyzers.