Rauf Sajid, Zhu Bin, Yousaf Shah M A K, Tayyab Zuhra, Attique Sanam, Ali Nasir, Mushtaq Naveed, Wang Baoyuan, Yang Changping, Asghar Muhammad Imran, Lund Peter D
Hubei Collaborative Innovation Centre for Advanced Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, Hubei 430062, P. R. China.
Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, No.2 Si Pai Lou, Nanjing 210096, P. R. China.
ACS Appl Mater Interfaces. 2020 Aug 5;12(31):35071-35080. doi: 10.1021/acsami.0c10061. Epub 2020 Jul 28.
Dual-ion electrolytes with oxygen ion and proton-conducting properties are among the innovative solid oxide electrolytes, which exhibit a low Ohmic resistance at temperatures below 550 °C. BaCoFeZrYO with a perovskite-phase cathode has demonstrated efficient triple-charge conduction (H/O/e) in a high-performance low-temperature solid oxide fuel cell (LT-SOFC). Here, we designed another type of triple-charge conducting perovskite oxide based on BaSrCoFeZrYO (BSCFZY), which formed a heterostructure with ionic conductor CaCeSmO (SCDC), showing both a high ionic conductivity of 0.22 S cm and an excellent power output of 900 mW cm in a hybrid-ion LT-SOFC. In addition to demonstrating that a heterostructure BSCFZY-SCDC can be a good functional electrolyte, the existence of hybrid H/O conducting species in BSCFZY-SCDC was confirmed. The heterointerface formation between BSCFZY and SCDC can be explained by energy band alignment, which was verified through UV-vis spectroscopy and UV photoelectron spectroscopy (UPS). The interface may help in providing a pathway to enhance the ionic conductivities and to avoid short-circuiting. Various characterization techniques are used to probe the electrochemical and physical properties of the material containing dual-ion characteristics. The results indicate that the triple-charge conducting electrolyte is a potential candidate to further reduce the operating temperature of SOFC while simultaneously maintaining high performance.
具有氧离子和质子传导特性的双离子电解质是创新型固体氧化物电解质之一，在低于550℃的温度下表现出低欧姆电阻。具有钙钛矿相阴极的BaCoFeZrYO在高性能低温固体氧化物燃料电池（LT-SOFC）中已证明具有高效的三电荷传导（H/O/e）。在此，我们基于BaSrCoFeZrYO（BSCFZY）设计了另一种三电荷传导钙钛矿氧化物，它与离子导体CaCeSmO（SCDC）形成异质结构，在混合离子低温固体氧化物燃料电池中显示出0.22 S cm的高离子电导率和900 mW cm的优异功率输出。除了证明异质结构BSCFZY-SCDC可以是一种良好的功能电解质外，还证实了BSCFZY-SCDC中存在混合H/O传导物种。BSCFZY和SCDC之间的异质界面形成可以通过能带排列来解释，这通过紫外可见光谱和紫外光电子能谱（UPS）得到了验证。该界面可能有助于提供一条提高离子电导率并避免短路的途径。使用各种表征技术来探测具有双离子特性的材料的电化学和物理性质。结果表明，三电荷传导电解质是进一步降低固体氧化物燃料电池工作温度同时保持高性能的潜在候选材料。
