This work investigates the transient performance and stability of CO_(2)/H_(2)O co-electrolysis in an air-free environment using a flat-tube solid oxide electrolysis cell(SOEC)stack.The results showed that the transie...This work investigates the transient performance and stability of CO_(2)/H_(2)O co-electrolysis in an air-free environment using a flat-tube solid oxide electrolysis cell(SOEC)stack.The results showed that the transient behavior of the stack with and without blowing gas into the air electrode is almost the same.With a current density of 0.67 A·cm^(-2)@750℃,the stack operated for over 200 h under co-electrolysis conditions without air blowing,and the voltage drop rate of the stack was approximately 0.203%/100 hours.Microstructure analysis revealed a significant loss of nickel particles and an apparent for-mation of an insulating phase strontium chromate(SrCrO4)on the surface of the current collection layer of the air electrode,which are identified as key factors contributing to the performance degradation of the stack.This study provides a reference for development of efficient fuel preparation technology based on SOEC stack in airless environments.展开更多
This study employs the method of embedding voltage leads within three cells of an electrolysis stack to investigate the quantitative impact of the electrolysis cells and their interfaces on overall stack performance.A...This study employs the method of embedding voltage leads within three cells of an electrolysis stack to investigate the quantitative impact of the electrolysis cells and their interfaces on overall stack performance.A 900-h stability test was conducted at a constant temperature of 750℃with a current density of 500 mA/cm_(2)and 60 vol.%(volume fraction)water steam content.The results indicate the electrolysis voltage of the stack increased by 0.213 V,while the voltage across the three cells increased by 0.268 V.Post-mortem analysis reveals changes in the three-phase boundary(TPB)and porosity of the Ni-YSZ electrodes across different cells.These structural changes explain the variations in both ohmic resistance and polarization resistance.In contrast,the voltage drop across the current-collecting interface between the interconnect and the cell decreases by 0.055 V,accounting for 25.82%of the total stack degradation.Improved interface contact helps inhibit stack degradation.Future work will further investigate the stability of stack components and their interfaces,aiming to optimize stack design.展开更多
基金co-supported by the National Key R&D Program of China(No.2022YFB4002203)Baima Lake Laboratory Joint Funds of the Zhejiang Provincial Natural Science Foundation of China(No.LBMHY24B060003)Ningbo Key R&D Project(No.2023Z155).
文摘This work investigates the transient performance and stability of CO_(2)/H_(2)O co-electrolysis in an air-free environment using a flat-tube solid oxide electrolysis cell(SOEC)stack.The results showed that the transient behavior of the stack with and without blowing gas into the air electrode is almost the same.With a current density of 0.67 A·cm^(-2)@750℃,the stack operated for over 200 h under co-electrolysis conditions without air blowing,and the voltage drop rate of the stack was approximately 0.203%/100 hours.Microstructure analysis revealed a significant loss of nickel particles and an apparent for-mation of an insulating phase strontium chromate(SrCrO4)on the surface of the current collection layer of the air electrode,which are identified as key factors contributing to the performance degradation of the stack.This study provides a reference for development of efficient fuel preparation technology based on SOEC stack in airless environments.
基金supported by the National Key R&D Program of China(Grant No.2022YFB4002203).
文摘This study employs the method of embedding voltage leads within three cells of an electrolysis stack to investigate the quantitative impact of the electrolysis cells and their interfaces on overall stack performance.A 900-h stability test was conducted at a constant temperature of 750℃with a current density of 500 mA/cm_(2)and 60 vol.%(volume fraction)water steam content.The results indicate the electrolysis voltage of the stack increased by 0.213 V,while the voltage across the three cells increased by 0.268 V.Post-mortem analysis reveals changes in the three-phase boundary(TPB)and porosity of the Ni-YSZ electrodes across different cells.These structural changes explain the variations in both ohmic resistance and polarization resistance.In contrast,the voltage drop across the current-collecting interface between the interconnect and the cell decreases by 0.055 V,accounting for 25.82%of the total stack degradation.Improved interface contact helps inhibit stack degradation.Future work will further investigate the stability of stack components and their interfaces,aiming to optimize stack design.
