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首页> 外文期刊>Advanced Functional Materials >Proton Conduction in Dense and Porous Nanocrystalline Ceria Thin Films
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Proton Conduction in Dense and Porous Nanocrystalline Ceria Thin Films

机译：致密和多孔纳米晶二氧化铈薄膜中的质子传导

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摘要

The electrical conductivity of ceria thin films (epitaxial as well as dense and porous nanocrystalline) is investigated in dry and wet atmosphere at temperatures below 500 ℃. For the epitaxial and the fully dense nanocrystalline samples, no significant differences can be observed between dry and wet conditions. In marked contrast, the nanocrystalline porous films obtained via spin coating exhibit a considerable enhancement of the protonic conductivity below 300 C in wet atmosphere. This outcome reveals that the residual open mesoporosity plays the key role for the enhancement of the proton transport at low temperatures and not the high density of grain boundaries. The quantitative analysis of the various pathways, along which the proton transport can take place, indicates that the observed proton conduction can arise not only from bulk water adsorbed in the open pores but also from the space charge zones on the water side of the water/oxide interface.
机译：研究了二氧化铈薄膜（外延以及致密和多孔的纳米晶体）在干燥和潮湿的环境中在低于500℃的温度下的电导率。对于外延和完全致密的纳米晶体样品，在干燥和潮湿条件下均未观察到明显差异。形成鲜明对比的是，通过旋涂获得的纳米晶体多孔膜在湿气氛下低于300℃显示出质子传导率的显着提高。这一结果表明，残余的开放介孔在低温而不是高晶界密度的提高中对质子传输的增强起关键作用。进行质子传输的各种途径的定量分析表明，观察到的质子传导不仅可能来自吸附在开孔中的大量水，而且还可能来自水/水侧的空间电荷区。氧化物界面。

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  • 来源
    《Advanced Functional Materials》 |2013年第47期|5861-5867|共7页
  • 作者

    Giuliano Gregori; Mona Shirpour; Joachim Maier;

  • 作者单位

    Max Planck Institute for Solid State Research Heisenbergstr. 1, D-70569 Stuttgart, Germany;

    Max Planck Institute for Solid State Research Heisenbergstr. 1, D-70569 Stuttgart, Germany,Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA;

    Max Planck Institute for Solid State Research Heisenbergstr. 1, D-70569 Stuttgart, Germany;

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