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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Engineering microstructure and redox properties in the mixed conductor Ce_(0.9)Pr_(0.1)O_(2?δ) + Co 2 mol%?
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Engineering microstructure and redox properties in the mixed conductor Ce_(0.9)Pr_(0.1)O_(2?δ) + Co 2 mol%?

机译：Ce_（0.9）Pr_（0.1）O_（2δδ）+ Co 2 mol％？混合导体中的工程微观结构和氧化还原性能

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摘要

10% Praseodymium doped ceria exhibits a combination of mixed ionic and electronic conductivity, redox catalytic properties and chemical compatibility with water and carbon dioxide at high temperatures. Minor additions of cobalt oxide have been demonstrated to act as a sintering aid as well as an effective promoter of the electronic conduction. However, an excess of sintering temperature causes cobalt aggregation into the grain boundaries as inferred from FE-SEM/EDX and TEM analysis. The redox behaviour of the materials was studied by means of temperature programmed desorption (TPD) and reduction (TPR). This work shows the systematic study of sintering conditions in order to understand the evolution of the material microstructure, grain boundaries and the role of cobalt in this complex system. The final purpose of the work is to improve both electronic and oxygen ion transport properties for their potential application as oxygen-transport membranes and solid oxide fuel cell components. The sample sintered at 1000 °C exhibited the highest total conductivity at high temperatures, which is principally related to the improvement in the electronic conductivity through the grain boundary network.
机译：掺Pra 10％的二氧化铈在高温下具有混合的离子电导率，电子电导率，氧化还原催化性能以及与水和二氧化碳的化学相容性。已证明少量添加氧化钴可作为烧结助剂以及电子传导的有效促进剂。然而，如FE-SEM / EDX和TEM分析所推断的那样，过量的烧结温度导致钴聚集到晶界中。通过程序升温脱附（TPD）和还原（TPR）研究了材料的氧化还原行为。这项工作显示了对烧结条件的系统研究，以了解材料微观结构，晶界和钴在此复杂系统中的作用。这项工作的最终目的是改善电子和氧离子的传输性能，以潜在地用作氧传输膜和固体氧化物燃料电池组件。在1000°C下烧结的样品在高温下表现出最高的总电导率，这主要与通过晶界网络提高电子电导率有关。

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