In-situ growth of Ru/RuO2 nanoparticles decorated (La0.6Sr1.4)0.95Mn0.9Ru0.1O4 as a potential electrode for symmetrical solid oxide fuel cells

Junkai Wang, Jiaming Yang, Lei Fu, Zheng Zong, Jun Zhou and Kai Wu

Renewable Energy, 2022, vol. 189, issue C, 1419-1427

Abstract: The A-site deficient (La0.6Sr1.4)0.95Mn0.9Ru0.1O4 (LSMRuO4) K2NiF4-type oxide is developed as a potential electrode for symmetrical solid oxide fuel cells (SSOFCs) with Ru/RuO2 nanoparticles decorating, which exhibits enhanced electrochemical activity for both hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR). The Ru nanoparticles are introduced via in-situ exsolution and distribute uniformly on the surface of LSMRuO4 as fuel electrode. And the metallic Ru nanoparticles were converted into RuO2 nanoparticles after exposing furtherly to the conditions encountered at oxygen electrode. Decorated by Ru nanoparticles, the highest electrical conductivity of 10.07 S cm−1 and lowest polarization resistance of 0.28 Ω cm2 are obtained for LSMRuO4 in 5% H2/N2 at 750 °C. Additionally, modified by RuO2 nanoparticles, LSMRuO4 also exhibits the highest electrical conductivity of 55.23 S cm−1 and lowest polarization resistance of 0.12 Ω cm2 at 750 °C in air. With Ru nanoparticles at fuel electrode and RuO2 nanoparticles at oxygen electrode simultaneously, the LSMRuO4-SSZ|SSZ|LSMRuO4-SSZ (Sc2O3 stabilized ZrO2) single cell demonstrates the highest power output of 711 mW cm−2 at 750 °C using pure H2 as fuel. All these results indicate that Ru/RuO2 nanoparticles decorated LSMRuO4 can be a favorable electrode for SSOFCs.

Keywords: SSOFCs; Ru/RuO2 nanoparticles; In-situ growth; K2NiF4-Type oxides; Electrochemical performance (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:189:y:2022:i:c:p:1419-1427

DOI: 10.1016/j.renene.2022.03.022

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