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Related Concept Videos

Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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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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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Geometric Catalyst Utilization in Zero-Gap CO2 Electrolyzers.

Siddhartha Subramanian1, Kailun Yang1, Mengran Li1

  • 1Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands.

ACS Energy Letters
|January 20, 2023
PubMed
Summary
This summary is machine-generated.

Maximizing catalyst utilization in electrochemical carbon dioxide reduction (CO2RR) requires effective CO2 delivery. Cathode pressure drop is key to maintaining CO2 access, especially with varied flow fields.

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Chemical Engineering

Background:

  • Electrochemical reduction of carbon dioxide (CO2RR) is crucial for sustainable chemical production.
  • Silver catalysts are effective for CO2RR but require optimal conditions for high performance.
  • Maximizing catalyst utilization is essential for efficient CO2RR processes.

Purpose of the Study:

  • To investigate time-dependent factors affecting geometric catalyst utilization in CO2RR.
  • To evaluate the impact of different flow fields on catalyst performance in a zero-gap membrane electrode assembly.
  • To identify strategies for maintaining catalyst utilization under demanding operating conditions.

Main Methods:

  • Utilized three distinct flow fields (serpentine, parallel, interdigitated) in a zero-gap membrane electrode assembly.
  • Measured cathode pressure drop and its correlation with CO2 transport and catalyst utilization.
  • Employed selectivity measurements, double-layer capacitance, and transport modeling to assess GDL flooding and CO2 distribution.

Main Results:

  • Cathode pressure drop significantly influences catalyst utilization across all time scales.
  • Higher pressure drop, achieved with the serpentine flow field, enhances in-plane CO2 transport and mitigates blockages.
  • The serpentine flow field demonstrated superior failure resistance, reaching a CO partial current density of 205 mA/cm² at 2.76 V.

Conclusions:

  • Cathode pressure drop is the most critical factor for maintaining catalyst utilization in CO2RR.
  • Flow field design directly impacts CO2 delivery and catalyst performance, with serpentine offering the best resistance to failure.
  • Optimizing gas-diffusion layer transport through pressure management is key for scalable and efficient CO2RR technologies.