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Achieving excellent and durable CO2 electrolysis performance on a dual-phase fuel electrode in solid oxide electrolysis cells
Journal of Power Sources ( IF 9.2 ) Pub Date : 2021-02-11 , DOI: 10.1016/j.jpowsour.2021.229599
Yihang Li , Yanpu Li , Lixiang Yu , Qicheng Hu , Qi Wang , Kristina Maliutina , Liangdong Fan

Conversion of CO2 into valuable chemicals through solid oxide electrolysis cells (SOECs) is a promising technology towards efficient utilization of CO2 and reducing its emission. However, the well-established Ni-cermet fuel electrode is not applicable for high-concentration or pure CO2 electrolysis due to the Ni oxidation and coking issues. Here, we report that a novel nominal Pr0.2Ca0.8Fe0.8Ni0.2O3-δ perovskite fuel electrode, which is self-assembled into Pr(Ca)Fe(Ni)O3-δ perovskite and Ca2Fe2O5 brownmillerite dual-phase composite during the calcination process, possesses efficient CO2 electrolysis activity. The presence of Ca2Fe2O5 with abundant oxygen vacancies significantly improves CO2 chemical adsorption and activation and Pr(Ca)Fe(Ni)O3-δ serves charge carrier matrix, and consequently leads to a high CO2 reduction reaction rate constant of 1.104 × 10−4 cm−1 at 800 °C as determined by the electrical conductivity relaxation method. The electrochemical performance of pure CO2 electrolysis is investigated in model SOECs, exhibiting an excellent current density of 0.648 Acm−2 at 1.5 V and 800 °C. Moreover, the cell shows no noticeable degradation under two constant current densities of 0.421 Acm−2 at 800 °C and 0.3 Acm−2 at 700 °C for nearly a total of 300 h. The present study reveals a novel strategy to develop dual-phase Pr(Ca)Fe(Ni)O3-δ-Ca2Fe2O5 materials as a reliable electrode for pure CO2 electrolysis.



中文翻译:

在固态氧化物电解池中的双相燃料电极上实现出色且持久的CO 2电解性能

通过固体氧化物电解池(SOEC)将CO 2转化为有价值的化学物质是一种有效利用CO 2并减少其排放的有前途的技术。然而,由于Ni的氧化和结焦问题,成熟的Ni-金属陶瓷燃料电极不适用于高浓度或纯CO 2电解。在这里,我们报道了一种新型的标称Pr 0.2 Ca 0.8 Fe 0.8 Ni 0.2 O3 钙钛矿燃料电极,它自组装成Pr(Ca)Fe(Ni)O3 钙钛矿和Ca 2 Fe 2 O 5褐铁矿双相复合材料在煅烧过程中具有有效的CO 2电解活性。具有大量氧空位的Ca 2 Fe 2 O 5的存在显着改善了CO 2的化学吸附和活化,并且Pr(Ca)Fe(Ni)O3 用作电荷载体基质,因此导致高的CO 2还原反应速率 通过电导率松弛法测定的800℃下的常数为1.104×10 -4  cm -1。纯CO 2的电化学性能在模型SOEC中研究了电解,在1.5 V和800°C下表现出0.648 Acm -2的出色电流密度。此外,该电池在两个恒定电流密度下(在800°C下为0.421 Acm -2和在700°C下为0.3 Acm -2),在几乎总计300 h内均未显示出明显的退化。本研究揭示了开发双相Pr(Ca)Fe(Ni)O3 -δ- Ca 2 Fe 2 O 5材料作为纯CO 2电解可靠电极的新策略。

更新日期:2021-02-11
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