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Improving oxygen incorporation rate on (La0.6Sr0.4)0.98FeO3-δ via Pr2Ni1-xCuxO4+δ surface decoration
Journal of Power Sources ( IF 8.1 ) Pub Date : 2020-03-20 , DOI: 10.1016/j.jpowsour.2020.228035
Mohamad Khoshkalam , Ðorđije Tripković , Xiaofeng Tong , Mohammad Ali Faghihi-Sani , Ming Chen , Peter Vang Hendriksen

Insufficient electrocatalytic activity for oxygen reduction/evolution in lanthanum strontium ferrite (LSF) perovskites at temperatures below 700 °C, limits the utilization of these Co-free oxides as oxygen electrodes for intermediate-temperature solid oxide fuel/electrolysis cells (SOFC/SOEC). Marked performance improvement is here reported by decorating the surface with Pr2Ni1-xCuxO4 catalyst particles. Infiltrating porous LSF electrodes with aqueous nitrates solutions containing Pr, Ni and Cu, targeting the compositions Pr2Ni0.7Cu0.3O4 and Pr2Ni0.6Cu0.4O4, significantly reduces the polarization resistance at 650 °C from 0.98 Ω cm2 to 0.16 Ω cm2 and 0.13 Ω cm2 respectively. Electrical Conductivity Relaxation (ECR) measurements reveal that surface exchange rates, expressed by (kchem), are much more stable in week long aging experiments for Pr2Ni0.7Cu0.3O4 surface decorated LSF bars compared to the bare LSF. This shows that a Pr2Ni1-xCuxO4 infiltrated porous LSF backbone can be an efficient Co-free oxygen electrode for intermediate-temperature SOFC/SOEC.



中文翻译:

通过Pr 2 Ni 1-x Cu x O 4 +δ表面修饰提高(La 0.6 Sr 0.40.98 FeO3 -δ的氧结合率

在低于700°C的温度下,不足以实现铁酸镧锶铁氧体(LSF)钙钛矿中氧的还原/释放的电催化活性不足,限制了这些无钴氧化物作为中温固体氧化物燃料/电解电池(SOFC / SOEC)的氧电极的利用。在此报道了通过用Pr 2 Ni 1-x Cu x O 4催化剂颗粒装饰表面来显着改善性能。用包含Pr,Ni和Cu的硝酸盐水溶液渗透多孔LSF电极,其目标成分为Pr 2 Ni 0.7 Cu 0.3 O 4和Pr 2 Ni 0.6 Cu 0.4Ò 4,显著降低在650℃下的极化电阻从0.98Ω厘米2至0.16Ω厘米2和0.13Ω厘米2分别。电导率弛豫(ECR)测量表明,用(k Chem)表示的表面交换速率在长达一周的Pr 2 Ni 0.7 Cu 0.3 O 4表面装饰LSF棒老化试验中比裸LSF更稳定。这表明,Pr 2 Ni 1-x Cu x O 4渗透的多孔LSF主链可以是用于中温SOFC / SOEC的高效无钴氧电极。

更新日期:2020-03-20
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