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<p>Reversible solid oxide cells (RSOCs) can switch between solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) based on grid demand, enabling energy storage and release to improve energy utilization. This study develops a three-dimensional electro-chemical-gas-thermal coupling model for RSOC and identifies oxygen electrode thickness, electrolyte thickness, GDL porosity, and oxygen-electrode-side interconnect rib width as dominant factors governing RSOC operational characteristics through parametric analysis. Aiming at the different requirements of gas flow characteristics of RSOC under various operating modes, this study proposes a novel interconnector design, the Tesla Valve-Shuttle Interconnector (TVSI). The TVSI features a two-segment design on the oxygen electrode side, comprising a multi-stage Tesla Valve flow channel and a rectangular straight channel, while the hydrogen electrode side is equipped with discrete staggered, shuttle-shaped platforms. Gas velocity distribution, component distribution, pressure distribution, electrical performance, and temperature of both Conventional Rectangular Interconnector (CRI) and TVSI are compared under identical operating conditions and a countercurrent flow arrangement. The conclusions indicate that the TVSI enhances gas mass transfer, improves component distribution, reduces polarization overpotentials, and increases output performance and durability in both SOFC and SOEC modes, providing valuable insights for future cell design.</p>

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Numerical modeling of reversible solid oxide cells and optimization of the interconnector structure

  • 期刊论文

  • 发表日期：

    2025年5月16日

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  • Zhaonan Song,
  • Chaoyi Xu,
  • Jiawei Liao,
  • Jingjing Ye,
  • Zhanpeng Li,
  • Weirong Hong

摘要

Reversible solid oxide cells (RSOCs) can switch between solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) based on grid demand, enabling energy storage and release to improve energy utilization. This study develops a three-dimensional electro-chemical-gas-thermal coupling model for RSOC and identifies oxygen electrode thickness, electrolyte thickness, GDL porosity, and oxygen-electrode-side interconnect rib width as dominant factors governing RSOC operational characteristics through parametric analysis. Aiming at the different requirements of gas flow characteristics of RSOC under various operating modes, this study proposes a novel interconnector design, the Tesla Valve-Shuttle Interconnector (TVSI). The TVSI features a two-segment design on the oxygen electrode side, comprising a multi-stage Tesla Valve flow channel and a rectangular straight channel, while the hydrogen electrode side is equipped with discrete staggered, shuttle-shaped platforms. Gas velocity distribution, component distribution, pressure distribution, electrical performance, and temperature of both Conventional Rectangular Interconnector (CRI) and TVSI are compared under identical operating conditions and a countercurrent flow arrangement. The conclusions indicate that the TVSI enhances gas mass transfer, improves component distribution, reduces polarization overpotentials, and increases output performance and durability in both SOFC and SOEC modes, providing valuable insights for future cell design.