Hierarchical modeling of solid oxide cells and stacks producing syngas via H2O/CO2 Co-electrolysis for industrial applications

A. Banerjee, Y. Wang, J. Diercks, O. Deutschmann*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

22 Citations (Scopus)

Abstract

A hierarchical multi-physics continuum model is used to investigate syngas (H2 + CO) production in a solid oxide button cell, single repeating unit and cell stack. A novel cluster algorithm and pseudo-homogenous approach enables a computationally efficient model scale-up from 1-D button cells to 3-D stacks with minimal loss of information across the scales. The model agrees well with polarization, temperature and outlet gas composition measurements made by Fu et al. on single Ni-GDC|YSZ|LSM-YSZ cells [ECS Transactions 35, 2949–2956 (2011)]. After, the model generates 3-D contour plots to map the performance of a single repeating unit of a F-design stack from Forschungszentrum Jülich [Fuel Cells 7, 204–210 (2007)] producing output H2:CO ratios suitable for Fischer-Tropsch synthesis and hydroformylation. Over the range of conditions studied, the overall efficiency and syngas yield increases with residence time though beyond a threshold value, reactant starvation leads to a decrease in efficiency and a greater propensity for Ni coking. Increasing the operating temperature shifts peak efficiencies to lower voltages and the performance of the repeating unit is nearly identical for the two H2:CO ratios studied. On scaling up to produce a commercial quantity of syngas, shorter stacks lead to lower capital costs and smaller electrolyzer areas while running at lower velocities has the opposite effect although it minimizes temperature gradients. Stack simulation over a wide range of operating regimes, including pure H2O and CO2 electrolysis, divulges the time constants of charge, mass and heat transport.

Original languageEnglish
Pages (from-to)996-1013
Number of pages18
JournalApplied energy
Volume230
DOIs
Publication statusPublished - 15 Nov 2018
Externally publishedYes

Keywords

  • Co-electrolysis
  • Cost
  • Efficiency
  • Multi-physics model
  • Solid Oxide Electrolysis Cell (SOEC)
  • Stack dynamics

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