Operando isotopic exchange on SOFC cells: oxygen transport dependency on applied potential.,ChemPhysChem

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Operando isotopic exchange on SOFC cells: oxygen transport dependency on applied potential.
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-09-10 , DOI: 10.1002/cphc.202000574
Alexandre Nau ₁ , Clément Comminges ₁ , Nicolas Bion ₁

Affiliation

The oxygen isotopic exchange technique is a powerful tool to investigate the oxygen transport kinetics in an oxide solid. In a solid oxide fuel cell, isotopic surface exchange and diffusion coefficients are classically determined by using the Isotopic Exchange Depth Profiling method followed by ex situ SIMS characterizations. Despite its relevance, the utilization of in situ or operando techniques to measure the isotopic exchange under an electrical bias remains marginal. We developed here a set‐up which enables operando monitoring of oxygen exchange in SOFC type cells under polarization. The system has been used for studying the oxygen mobility dependency upon polarization on a symmetrical Pt/YSZ/Pt cell (YSZ: yttria‐stabilized zirconia). Homomolecular and heterolytic exchange reactions were undertaken to investigate the oxygen activation step and discriminate the limiting step among the sequence of elementary steps which constitute the oxygen transport process in the SOFC system. Oxygen ions incorporation into the dense ionic conductor was identified to be the rate determining step, and its first order rate constant dependency on applied potential was established.

中文翻译：

SOFC细胞上的Operando同位素交换：氧迁移对施加电势的依赖性。

氧同位素交换技术是研究氧化物固体中氧传输动力学的强大工具。在固体氧化物燃料电池中，经典的同位素表面交换和扩散系数是通过使用同位素交换深度剖析方法，然后进行易位SIMS表征来确定的。尽管具有相关性，但是在电偏压下利用原位或操作技术来测量同位素交换仍然很少。我们在这里开发了一种装置，该装置可以对极化状态下SOFC型电池中的氧气交换进行操作监测。该系统已用于研究对称Pt / YSZ / Pt电池（YSZ：氧化钇稳定的氧化锆）上极化对氧迁移率的依赖性。进行了分子和杂合交换反应，研究了氧活化步骤，并在构成SOFC系统中氧传输过程的基本步骤序列中区分了限制步骤。将掺入致密离子导体中的氧离子确定为速率确定步骤，并确定其一阶速率常数对施加电势的依赖性。

更新日期：2020-10-19

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