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Related Concept Videos

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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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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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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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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Ion Exchange01:17

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Electrochemical Systems01:24

Electrochemical Systems

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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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Electrodeposition01:08

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Solar-Driven Electrochemical Green Fuel Production from CO2 and Water Using Ti3C2Tx MXene-Supported CuZn and NiCo Catalysts
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Efficient Acidic CO2 Electrolysis with Suppressed Crossover in a Separator-Based Membrane Electrode Assembly.

Min Liu1, Yuke Li1, Jianan Erick Huang2

  • 1Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada.

Journal of the American Chemical Society
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This study introduces a novel zero-gap membrane electrode assembly for acidic electrochemical CO2 reduction, significantly suppressing CO2 crossover and enhancing C2+ production. The new design achieves high efficiency by carefully controlling ion transport within a specialized separator.

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science

Background:

  • Acidic electrochemical CO2 reduction (CO2R) in flow cells faces challenges with CO2 crossover and ohmic losses due to thick catholyte layers.
  • Removing catholytes leads to H2 selectivity due to excessive proton (H+) transport through cation exchange membranes (CEM).

Purpose of the Study:

  • To develop a zero-gap membrane electrode assembly (MEA) that suppresses CO2 crossover and enhances C2+ production in acidic CO2R.
  • To investigate the role of coupled ion transport (H+ and K+) in a novel separator for efficient CO2 electrolysis.

Main Methods:

  • Fabrication of a zero-gap MEA with an electrolyte-filled hydrophilic porous separator.
  • Tuning the H+ to K+ ratio and electrolyte permeance to regulate ion transport and suppress (bi)carbonate electromigration.
  • Utilizing a 7,7,8,8-tetracyanoquinodimethane-modified copper oxide catalyst for CO2 reduction.

Main Results:

  • Achieved significantly reduced CO2 crossover (0.19 sccm A-1).
  • Attained 75% multicarbon (C2+) Faradaic efficiency and 24% energy efficiency at 3.5 V (300 mA cm-2).
  • Demonstrated effective regulation of coupled H+ and K+ transport for optimized CO2R.

Conclusions:

  • The developed separator-based MEA enables efficient acidic CO2 electrolysis with suppressed crossover.
  • Controlling ion transport dynamics is crucial for high-performance CO2 reduction catalysts.
  • This approach offers a promising pathway for efficient CO2 conversion technologies.