Perovskites decorated with catalytically active nanoparticles show promising potential in power generation and energy conversion. Here, with the aim of developing symmetrical solid oxide fuel cells (SSOFCs) possessing high performance, an ingenious approach of in situ exsolution of metallic Ru nanoparticles under SSOFC operating condition is proposed. In this study, a novel perovskite oxide with A-site deficiency Sm_0.70Sr_0.20Fe_0.80Ti_0·15Ru_0·05O_3−δ (SSFTR7020) is meticulously designed and successfully synthesized. At 800 °C, the polarization resistance (R_p) of SSFTR7020 cathode is only 0.13 Ω cm², since the adidtionally formed oxygen vacancies contribute to the oxygen reduction reaction. Moreover, it is found that numerous metallic Ru nanoparticles are exsolved from SSFTR7020 perovskite support upon reduction, while no partilcle can be observed for stoichiometric SSFTR perovskite. This is because the artificially introduced deficiency can make exsolutsion become more dynamic. The maximum power output of symmetrical cell SSFTR7020|Sm_0.2Ce_0·8O_1.9 (SDC)|SSFTR7020 reaches 476 mW cm⁻² after operation ~96 h at 800 °C in humidified hydrogen.

用催化活性纳米粒子装饰的钙钛矿在发电和能量转换方面显示出广阔的潜力。在此，为了开发具有高性能的对称固体氧化物燃料电池（SSOFC），提出了一种在SSOFC工作条件下原位析出金属Ru纳米粒子的巧妙方法。在这项研究中，精心设计并成功合成了一种新的具有A位缺陷Sm _0.70 Sr _0.20 Fe _0.80 Ti _{0 · 15} Ru _{0 · 05} O _{3− δ的}钙钛矿氧化物。在800°C时的极化电阻（R _pSSFTR7020阴极的阴极电离仅为0.13Ωcm ²，因为附加形成的氧空位有助于氧还原反应。此外，发现还原后，从SSFTR7020钙钛矿载体中可溶解出许多金属Ru纳米粒子，而化学计量的SSFTR钙钛矿则未观察到颗粒。这是因为人为引入的缺陷可以使排解变得更加动态。对称电池SSFTR7020 | Sm _0.2 Ce _{0 · 8} O _1.9（SDC）| SSFTR7020的最大功率输出在加湿氢气中在800°C下运行约96 h后达到476 mW cm ^-2。