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Vaibhav Trivedi1,2,3, Vikram Vishal4,5,6, Arnab Dutta2,4,5

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This summary is machine-generated.

Bioinspired flow patterns in CO2 electrolyzers improve efficiency. Designs mimicking nature, like the Victoria amazonica leaf, balance mass transport and pressure drop for better catalyst utilization and energy efficiency.

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Area of Science:

  • Electrochemistry
  • Sustainable Energy
  • Chemical Engineering

Background:

  • Electrochemical conversion of carbon dioxide (CO2) offers a sustainable pathway to valuable chemicals and fuels.
  • Industrial-scale CO2 electrolysis using membrane electrode assemblies faces challenges with mass transport limitations and pressure drop, hindering efficiency and selectivity.

Purpose of the Study:

  • To investigate bioinspired flow patterns for optimizing CO2 electrolyzer performance.
  • To identify designs that enhance CO2 concentration at the catalyst surface while minimizing pressure drop.

Main Methods:

  • Utilized 3D Multiphysics simulations (COMSOL) to model various bioinspired flow patterns (Victoria amazonica leaf, camel's turbinate, avian lung, wave flow).
  • Coupled free and porous medium flow using the Brinkman interface and solved CO2 transport via the transport of concentrated species interface under steady-state conditions.

Main Results:

  • Victoria amazonica-inspired "A1" and hybrid avian-leaf "C1" designs showed high CO2 concentration and low pressure drop, indicating balanced mass transport.
  • "D1" (wave flow-inspired) achieved the highest CO2 concentration but with a significant pressure drop.
  • A sigmoidal model confirmed "A1" and "C1" optimize gas utilization at lower flow rates compared to conventional serpentine patterns.

Conclusions:

  • Bioinspired geometries, specifically "A1" and "C1", demonstrate significant potential for improving catalyst utilization in CO2 electrolyzers.
  • These designs can minimize parasitic energy losses, leading to more energy-efficient CO2 conversion.
  • The study provides a rational design strategy for scalable and efficient CO2 electrolyzers.