Abstract
The reversible solid oxide cell (RSOC) is an attractive technology to mutually convert power and chemicals at elevated temperatures. However, its development has been hindered mainly due to the absence of a highly active and durable fuel electrode. Here, we report a phase-transformed CoFe-Sr3Fe1.25Mo0.75O7−δ (CoFe-SFM) fuel electrode consisting of CoFe nanoparticles and Ruddlesden-Popper-layered Sr3Fe1.25Mo0.75O7−δ (SFM) from a Sr2Fe7/6Mo0.5Co1/3O6−δ (SFMCo) perovskite oxide after annealing in hydrogen and apply it to reversible CO/CO2 conversion in RSOC. The CoFe-SFM fuel electrode shows improved catalytic activity by accelerating oxygen diffusion and surface kinetics towards the CO/CO2 conversion as demonstrated by the distribution of relaxation time (DRT) study and equivalent circuit model fitting analysis. Furthermore, an electrolyte-supported single cell is evaluated in the 2:1 CO-CO2 atmosphere at 800°C, which shows a peak power density of 259 mW cm−2 for CO oxidation and a current density of −0.453 A cm−2 at 1.3 V for CO2 reduction, which correspond to 3.079 and 3.155 mL min−1 cm−2 for the CO and CO2 conversion rates, respectively. More importantly, the reversible conversion is successfully demonstrated over 20 cyclic electrolysis and fuel cell switching test modes at 1.3 and 0.6 V. This work provides a useful guideline for designing a fuel electrode through a surface/interface exsolution process for RSOC towards efficient CO-CO2 reversible conversion.
摘要
固体氧化物电池可实现CO/CO2的可逆转化, 在电能和化学能相互转化过程中显示出巨大潜力. 然而, 其商业化进展一直受到燃料极抗积碳性能差的限制. 本工作中, 我们发展了一种CoFe合金纳米颗粒和Ruddlesden-Popper层状结构Sr3Fe1.25Mo0.75O7−δ复合新型燃料电极(CoFe-SFM), 其可以通过钙钛矿Sr2Fe7/6Mo0.5Co1/3O6−δ在还原气氛中退火发生相变得到. 电化学阻抗谱和弛豫时间分步法分析可知CoFe-SFM电极通过改善体相氧化学扩散能力和表面氧交换过程来增强CO氧化和CO2还原动力学. 在固体氧化物燃料电池模式下, 800°C的最大功率达到259 mW cm−2; 在固体氧化物电解电池模式下, 1.3 V工作电压下单电池的电解电流密度为−0.453 A cm−2, 都远超对比电极材料. 在20次SOFC-SOEC循环操作条件下, CoFe-SFM燃料极依然保持稳定的微结构和抗积碳性能,电池性能保持良好. 该工作可为CO2转化、抗积碳电极材料设计和提升电极表界面反应动力学提供一定的指导作用.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation (52002249, 51402093 and 21706162), Guangdong Basic and Applied Basic Research Foundation (2019A1515110025 and 2017A 030313289), the Research Grant for Scientific Platform and Project of Guangdong Provincial Education Office (2019KTSCX151), China Postdoctoral Science Foundation (2020M682872) and Shenzhen Government’s Plan of Science and Technology (JCYJ201803005125247308) Technical support from the Instrumental Analysis Center of Shenzhen University (Xili Campus) is also appreciated.
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Fan L and Li Y conceived the idea, designed the experiments, analyzed the data and wrote the manuscript. Singh M and Zhuang Z performed the material microstructure characterization. Jing Y and Maliutina K participated in device optimization and data analysis. Li Y drafted the manuscript. He C and Fan L contributed to the final version of the manuscript. All authors contributed to the general discussion and reviewed the manuscript.
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The XPS O 1s spectra, SEM images of typical cells, the temperature dependence of RSOC electrochemical performance, EIS fitting and DRT deconvolution results are available in the online version of the paper.
Yihang Li received his PhD in materials science from the University of Science and Technology of China (USTC) in 2019. In 2019, he joined Dr. Fan’s group as a postdoc at Shenzhen University. His main research focuses on rational design and fabrication of novel perovskite materials as electrodes for solid oxide fuel/electrolysis cells.
Liangdong Fan received his PhD one in energy technology from the Royal Institute of Technology (KTH, Sweden) in 2014 and another in chemical technology from Tianjin University in 2012. In 2015, Dr. Fan joined Shenzhen University as a Lecturer/Research Associate Professor (Principal Investigator). His current research interests are developing inorganic functional materials such as perovskite oxides for high-temperature fuel cells and low-temperature electrocatalysis applications.
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Li, Y., Singh, M., Zhuang, Z. et al. Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode. Sci. China Mater. 64, 1114–1126 (2021). https://doi.org/10.1007/s40843-020-1531-7
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DOI: https://doi.org/10.1007/s40843-020-1531-7