Effect of gas compositions on co-electrolysis performance of solid oxide cells: Electromotive force and polarization resistance

被引：2

作者：

Kishimoto, Masashi ^{[1
]}

Nakamura, Riki ^{[1
]}

Iwai, Hiroshi ^{[1
]}

机构：

[1] Kyoto Univ, Dept Mech Engn & Sci, Nishikyo ku, Kyoto 6158540, Japan

来源：

ELECTROCHIMICA ACTA | 2025年 / 513卷

关键词：

Solid oxide electrolysis cell; Co-electrolysis; Electromotive force; Mixed potential theory; Reverse-water-gas-shift reaction; MODEL VALIDATION; CARBON-DIOXIDE; ENERGY-STORAGE; FUEL; STEAM; METHANATION; ANODE;

D O I：

10.1016/j.electacta.2024.145439

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Co-electrolysis performance of solid oxide cells is experimentally investigated with a focus on the electromotive force (EMF) and reaction resistance. Outlet gas composition is also analyzed to investigate the effect of the reverse-water-gas-shift (rWGS) reaction. The open-circuit voltage (OCV) of the cell is analyzed under various gas compositions with different reactant ratios. The mixed potential theory is employed to predict the EMF values based on the surface coverage ratio in the hydrogen electrode. The reaction resistance under co-electrolysis operation obtained from the equivalent circuit fitting analysis of the impedance spectra is compared with that under H2O and CO2 electrolysis operations. The results obtained in this study indicate that, near the OCV condition, H2O electrolysis is the main reaction under co-electrolysis operation to determine the OCVs and reaction resistance, and the main conversion pathway of CO2 into CO is the rWGS reaction.

引用

页数：9

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