Xu Dan, Yan An, Xu Shifeng, Zhou Yongjun, Yang Shu, Zhang Rongyu, Yang Xu, Lu Yuzheng
College of Science, Shenyang Aerospace University, Shenyang 110136, China.
Liaoning General Aviation Academy, Shenyang 110136, China.
Nanomaterials (Basel). 2021 Sep 11;11(9):2365. doi: 10.3390/nano11092365.
Triple (H/O/e) conducting oxides (TCOs) have been extensively investigated as the most promising cathode materials for solid oxide fuel cells (SOFCs) because of their excellent catalytic activity for oxygen reduction reaction (ORR) and fast proton transport. However, here we report a stable twin-perovskite nanocomposite Ba-Co-Ce-Y-O (BCCY) with triple conducting properties as a conducting accelerator in semiconductor ionic fuel cells (SIFCs) electrolytes. Self-assembled BCCY nanocomposite is prepared through a complexing sol-gel process. The composite consists of a cubic perovskite (Pm-3m) phase of BaCoCeYO and a rhombohedral perovskite (R-3c) phase of BaCeYO. A new semiconducting-ionic conducting composite electrolyte is prepared for SIFCs by the combination of BCCY and CeO (BCCY-CeO). The fuel cell with the prepared electrolyte (400 μm in thickness) can deliver a remarkable peak power density of 1140 mW·cm with a high open circuit voltage (OCV) of 1.15 V at 550 °C. The interface band energy alignment is employed to explain the suppression of electronic conduction in the electrolyte. The hybrid H/O ions transport along the surfaces or grain boundaries is identified as a new way of ion conduction. The comprehensive analysis of the electrochemical properties indicates that BCCY can be applied in electrolyte, and has shown tremendous potential to improve ionic conductivity and electrochemical performance.
三重（H/O/e）导电氧化物（TCOs）因其对氧还原反应（ORR）具有优异的催化活性和快速的质子传输能力，作为固体氧化物燃料电池（SOFCs）最有前景的阴极材料受到了广泛研究。然而，在此我们报道一种具有三重导电特性的稳定双钙钛矿纳米复合材料Ba-Co-Ce-Y-O（BCCY），作为半导体离子燃料电池（SIFCs）电解质中的导电促进剂。通过络合溶胶-凝胶法制备了自组装的BCCY纳米复合材料。该复合材料由BaCoCeYO的立方钙钛矿（Pm-3m）相和BaCeYO的菱面体钙钛矿（R-3c）相组成。通过将BCCY与CeO（BCCY-CeO）结合，为SIFCs制备了一种新型的半导体-离子导电复合电解质。使用制备的电解质（厚度为400μm）的燃料电池在550℃下可提供1140 mW·cm的显著峰值功率密度和1.15 V的高开路电压（OCV）。采用界面能带能量排列来解释电解质中电子传导的抑制。杂化的H/O离子沿表面或晶界的传输被确定为一种新的离子传导方式。对电化学性能的综合分析表明，BCCY可应用于电解质中，并已显示出提高离子电导率和电化学性能的巨大潜力。
