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Ionomigration of Neutral Phases in Ionic Conductors

机译：离子导体中性相的电离化

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摘要

Without sensing any physical force, a neutral object in an ion conducting solid can move in a uniform electrochemical field by coupling a global ion wind with localized counterion diffusion at the interface. This happens to pores and gas bubbles at 840 °C in a fast O2− conductor, yttria-stabilized zirconia (YSZ), despite having cations that are essentially frozen with lattice diffusivities 1012 times slower than the O2− diffusivity. Through-thickness migration and massive electro-sintering in thin YSZ ceramics are observed at voltages similar to those in YSZ fuel cells and electrolysis cells. This effect should apply to any electrochemically-loaded multiphase ionic conducting solid, with or without an electric field, and can lead to electrolyte sintering, phase accumulation and electrode debonding, resulting in unexpected benefit or damage in electrochemical devices. As the velocity obeys a pseudo Stokes-Einstein equation, inversely proportional to the object size, an especially enhanced size effect is expected in nanocomposites.
机译：在不感测任何物理力的情况下，通过将整体离子风与界面处的局部抗衡离子扩散耦合，离子导电固体中的中性物体可以在均匀的电化学场中移动。这种情况发生在快速的O2-导体，氧化钇稳定的氧化锆（YSZ）中的840°C的孔和气泡中，尽管阳离子的晶格扩散率比O2-扩散率慢1012倍。在与YSZ燃料电池和电解池相似的电压下，可以观察到薄YSZ陶瓷中的厚度迁移和大量电烧结。该效应应适用于任何带有或不带有电场的电化学负载的多相离子导电固体，并且可能导致电解质烧结，相聚和电极剥离，从而导致电化学装置意外受益或损坏。由于速度服从与物体尺寸成反比的伪Stokes-Einstein方程，因此在纳米复合材料中有望获得特别增强的尺寸效果。

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  • 来源
    《Advanced energy materials》 |2012年第11期|1-7|共7页
  • 作者

    I.-Wei Chen; Seung-Wan Kim; Ju Li; Suk-Joong L. Kang; Fuqiang Huang;

  • 作者单位

    Department of Materials Science and Engineering University of Pennsylvania Philadelphia PA 19104-6272 USA;

    Department of Materials Science and Engineering University of Pennsylvania Philadelphia PA 19104-6272 USA;

    Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology Daejeon 305-701 Korea;

    Department of Materials Science and Engineering University of Pennsylvania Philadelphia PA 19104-6272 USA;

    Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology Daejeon 305-701 Korea;

    State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China;

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  • 正文语种 eng
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  • 关键词

    ionomigration; solid oxide fuel cells; electrolysis cells; yttria-stabilized zirconia; ionic conductors;

    机译：离子迁移;固体氧化物燃料电池;电解池;氧化钇稳定的氧化锆;离子导体;

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