{"title":"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。","authors":"Hirofumi Sumi, Mizuki Momai, Yohei Tanaka","doi":"10.1002/cssc.202501182","DOIUrl":null,"url":null,"abstract":"<p><p>For solid oxide electrolysis cells (SOECs) during steam/CO<sub>2</sub> 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 H<sub>2</sub>O/CO<sub>2</sub> = 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.</p>","PeriodicalId":149,"journal":{"name":"ChemSusChem","volume":" ","pages":"e202501182"},"PeriodicalIF":6.6000,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of Gas Diffusivity in Fuel Electrode on Initial Durability for Solid Oxide Cells during Steam/CO<sub>2</sub> Coelectrolysis.\",\"authors\":\"Hirofumi Sumi, Mizuki Momai, Yohei Tanaka\",\"doi\":\"10.1002/cssc.202501182\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>For solid oxide electrolysis cells (SOECs) during steam/CO<sub>2</sub> 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 H<sub>2</sub>O/CO<sub>2</sub> = 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.</p>\",\"PeriodicalId\":149,\"journal\":{\"name\":\"ChemSusChem\",\"volume\":\" \",\"pages\":\"e202501182\"},\"PeriodicalIF\":6.6000,\"publicationDate\":\"2025-09-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ChemSusChem\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1002/cssc.202501182\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ChemSusChem","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1002/cssc.202501182","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Effect of Gas Diffusivity in Fuel Electrode on Initial Durability for Solid Oxide Cells during Steam/CO2 Coelectrolysis.
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.
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