Solid oxide fuel cells (SOFCs) have received continuous attention as an energy conversion device, and the development of highly electrochemically active materials is important. In this work, highly active and CO tolerant BaBiCoO@PrBaCoO heterostructure electrode materials were fabricated by a facile A-site deficiency in PrBaCoO double perovskite. A-site excess-deficient PrBaCoO (PBC80) double-perovskite oxide were prepared and designed to induce the self-assembly dissolution to form BaCoO (BCO) heterostructure through cationic high-concentration deficiency. However, the surface-dissolved alkaline earth metal (Ba) readily forms carbonates with CO, which severely limits the cathode catalytic activity and long-term stability. Thus, bismuth ion-modified PBC80 (BBCO@PBCO) was prepared to further tailor the material properties, which provides more active sites for oxygen reduction reaction (ORR) by strengthening the synergistic interaction between the heterogeneous interfaces. More importantly, BBCO@PBCO exhibits the most stable Area specific resistance (ASR) under CO atmosphere, indicating the incorporation of acidic Bi ions effectively mitigated the adsorption and reaction between the material and the acidic gas CO. These results indicate that the heterostructure induced by A-site deficiency promotes the ORR activity of PrBaCoO cathode, while further modification of Bi ions enhances both the electrochemical activity and the stability of the materials, delivering superior resistance to CO poisoning.

中文翻译：

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通过 Pr1-xBaCo2O5+δ 双钙钛矿中简单的 A 位缺陷策略设计高活性和耐 CO2 异质结构电极材料

固体氧化物燃料电池（SOFC）作为一种能量转换装置受到持续关注，高电化学活性材料的开发非常重要。在这项工作中，通过 PrBaCoO 双钙钛矿中容易的 A 位缺陷制备了高活性和耐 CO 的 BaBiCoO@PrBaCoO 异质结构电极材料。制备并设计了A位过量缺陷的PrBaCoO（PBC80）双钙钛矿氧化物，通过阳离子高浓度缺陷诱导自组装溶解形成BaCoO（BCO）异质结构。然而，表面溶解的碱土金属（Ba）很容易与CO形成碳酸盐，这严重限制了阴极催化活性和长期稳定性。因此，制备了铋离子改性的PBC80（BBCO@PBCO）以进一步调整材料性能，通过加强异质界面之间的协同相互作用，为氧还原反应（ORR）提供更多的活性位点。更重要的是，BBCO@PBCO在CO气氛下表现出最稳定的面积比电阻（ASR），表明酸性Bi离子的掺入有效减轻了材料与酸性气体CO之间的吸附和反应。这些结果表明，由A位缺陷促进了PrBaCoO阴极的ORR活性，而Bi离子的进一步修饰增强了材料的电化学活性和稳定性，从而具有优异的抗CO中毒能力。