Effect of Gas Diffusivity in Fuel Electrode on Initial Durability for Solid Oxide Cells during Steam/CO2 Coelectrolysis.

IF 6.6 2区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
ChemSusChem Pub Date : 2025-09-30 DOI:10.1002/cssc.202501182
Hirofumi Sumi, Mizuki Momai, Yohei Tanaka
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引用次数: 0

Abstract

For solid oxide electrolysis cells (SOECs) during steam/CO2 coelectrolysis, the slopes of current density-voltage curves frequently increase at high current densities due to an increase in gas diffusion overpotential. The gas diffusivity strongly affects the initial performance for coelectrolysis SOECs. The durabilities of SOECs during coelectrolysis are generally lower compared to those of SOECs during steam-only electrolysis and solid oxide fuel cells during power generation. The present work investigates the effect of gas diffusivity in the fuel electrode on the initial durability during coelectrolysis at H2O/CO2 = 2 and 700 °C for fuel electrode-supported microtubular SOECs with varying geometries and using different fuel electrode materials. Upon varying the geometries and materials, high initial performances are observed for cells with low polarization resistances associated with the gas-related processes in the fuel electrode. However, the initial deterioration during coelectrolysis remains unchanged for cells using the same fuel electrode materials with different geometries. Material variations lead to changes in the fuel electrode microstructure, such as the pore size and the pore distribution, which in turn affect the gas diffusivity in the fuel electrode substrate. Additionally, it is found that microstructural variations in the fuel electrode significantly influence the initial durability of coelectrolysis SOECs.

蒸汽/CO2共电解过程中燃料电极气体扩散率对固体氧化物电池初始耐久性的影响。
对于蒸汽/CO2共电解过程中的固体氧化物电解槽(soec),由于气体扩散过电位的增加,电流密度-电压曲线的斜率在高电流密度下经常增加。气体扩散率对共电解soec的初始性能有很大影响。与纯蒸汽电解和固体氧化物燃料电池相比,共电解过程中soec的耐用性通常较低。本研究研究了燃料电极中气体扩散率对不同几何形状和不同燃料电极材料的燃料电极支持的微管soec在H2O/CO2 = 2和700℃共电解过程中初始耐久性的影响。在改变几何形状和材料后,观察到与燃料电极中气体相关过程相关的低极化电阻的电池具有较高的初始性能。然而,对于使用不同几何形状的相同燃料电极材料的电池,共电解过程中的初始劣化保持不变。材料的变化导致燃料电极微观结构的变化,如孔隙大小和孔隙分布,从而影响燃料电极衬底中的气体扩散率。此外,还发现燃料电极的微观结构变化对共电解soec的初始耐久性有显著影响。
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
ChemSusChem
ChemSusChem 化学-化学综合
CiteScore
15.80
自引率
4.80%
发文量
555
审稿时长
1.8 months
期刊介绍: ChemSusChem Impact Factor (2016): 7.226 Scope: Interdisciplinary journal Focuses on research at the interface of chemistry and sustainability Features the best research on sustainability and energy Areas Covered: Chemistry Materials Science Chemical Engineering Biotechnology
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