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

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2024-11-29 DOI:10.1016/j.electacta.2024.145439

Masashi Kishimoto, Riki Nakamura, Hiroshi Iwai

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Abstract

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.

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气体成分对固体氧化物电池共电解性能的影响：电动势和极化电阻

实验研究了固体氧化物电池的共电解性能，重点研究了电动势（EMF）和反应电阻。分析了出口气体组成，探讨了反水-气移位（rWGS）反应的影响。分析了不同气体成分、不同反应物配比下电池的开路电压（OCV）。根据氢电极的表面覆盖率，采用混合电位理论预测电动势值。通过阻抗谱的等效电路拟合分析得到了共电解工况下的反应电阻，并与H2O和CO2电解工况下的反应电阻进行了比较。本研究结果表明，在OCV条件下，共电解操作以H2O电解为主要反应，以确定OCV和反应阻力，CO2转化为CO的主要途径是rWGS反应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.