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Numerical Investigation on the Performance of IT-SOEC with Double-Layer Composite Electrode

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Listed:
  • Yan Shao

    (College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)

  • Yongwei Li

    (College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)

  • Zaiguo Fu

    (College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
    Shanghai Non-Carbon Energy Conversion and Utilization Institute, Shanghai 200240, China)

  • Jingfa Li

    (School of Mechanical Engineering & Hydrogen Energy Research Centre, Beijing Institute of Petrochemical Technology, Beijing 102617, China)

  • Qunzhi Zhu

    (College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)

Abstract

The double-layer composite electrode has attracted increasing attention in the field of intermediate-temperature solid oxide electrolysis cells (IT-SOEC). To investigate the effects of the cathode diffusion layer (CDL) and cathode functional layer (CFL) structure on performance, a three-dimensional multi-scale IT-SOEC unit model is developed. The model comprehensively considers the detailed mass transfer, electrochemical reaction and heat transfer processes. Meanwhile, percolation theory is adopted to preserve the structural characteristics and material properties of the composite electrode. The mesostructure model and the macroscopic model are coupled in the solution. The effects of the porosity of the CDL, the electrode particle size and the composition of the composite electrode in the CFL on the mass transport process and electrolysis performance of the IT-SOEC unit are analyzed. The results show that the appropriate mass flux and energy consumption in the electrode are obtained with a CDL porosity in the range of 0.3–0.5. The decrease in the electrode particle size is conducive to the improvement of the electrolysis reaction rate. The maximum reaction rate in the CFL increases by 32.64% when the radius of the electrode particle is reduced from 0.5 μm to 0.3 μm. The excellent performance can be obtained when the volume fractions of the electrode phase and electrolyte phase in the CFL tend to be uniform. This study will provide guidance for the performance optimization of IT-SOEC and further promote the development of IT-SOEC hydrogen production technology in engineering applications.

Suggested Citation

  • Yan Shao & Yongwei Li & Zaiguo Fu & Jingfa Li & Qunzhi Zhu, 2023. "Numerical Investigation on the Performance of IT-SOEC with Double-Layer Composite Electrode," Energies, MDPI, vol. 16(6), pages 1-20, March.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:6:p:2525-:d:1090105
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    References listed on IDEAS

    as
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