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首页> 外文期刊>Advanced materials for optics and electronics >Surface-Modified Low-Temperature Solid Oxide Fuel Cell
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Surface-Modified Low-Temperature Solid Oxide Fuel Cell

机译：表面改性的低温固体氧化物燃料电池

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摘要

This paper reports both experimental and theoretical results of the role of surface modification on the oxygen reduction reaction in low-temperature solid oxide fuel cells (LT-SOFC). Epitaxial ultrathin films of yttria-doped ceria (YDC) cathode interlayers (<10-130 nm) are grown by pulsed laser deposition (PLD) on single-crystalline YSZ(100). Fuel cell current-voltage measurements and electrochemical impedance spectroscopy are performed in the temperature range of 350°C ≈ 450 °C. Quantum mechanical simulations of oxygen incorporation energetics support the experimental results and indicate a low activation energy of only 0.07 eV for YDC, while the incorporation reaction on YSZ is activated by a significantly higher energy barrier of 0.38 eV. Due to enhanced oxygen incorporation at the modified Pt/YDC interface, the cathodic interface resistance is reduced by two-fold, while fuel cell performance shows more than a two-fold enhancement with the addition of an ultrathin YDC interlayer at the cathode side of an SOFC element. The results of this study open up opportunities for improving cell performance, particularly of LT-SOFCs by adopting surface modification of YSZ surface with catalytically superior, ultrathin cathodic interlayers.
机译：本文报道了表面改性对低温固体氧化物燃料电池（LT-SOFC）中的氧还原反应的作用的实验和理论结果。通过脉冲激光沉积（PLD）在单晶YSZ（100）上生长掺杂氧化钇的二氧化铈（YDC）阴极中间层（<10-130 nm）的外延超薄膜。燃料电池电流-电压测量和电化学阻抗谱在350°C≈450°C的温度范围内进行。氧结合能的量子力学模拟支持了实验结果，并表明YDC的活化能仅为0.07 eV，而YSZ上的结合反应却被0.38 eV的更高的能垒激活。由于改进的Pt / YDC界面处的氧结合增加，阴极界面电阻降低了两倍，而燃料电池的性能显示出超过两倍的增强，而在阴极的阴极侧增加了超薄的YDC中间层。 SOFC元素。这项研究的结果为通过采用具有优异催化作用的超薄阴极夹层对YSZ表面进行表面改性，为改善电池性能（尤其是LT-SOFC）提供了机会。

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  • 来源
    《Advanced materials for optics and electronics》 |2011年第24期|p.4684-4690|共7页
  • 作者

    Young Beom Kim; Timothy P. Holme; Turgut M. Gur; Fritz B. Prinz;

  • 作者单位

    Department of Mechanical Engineering Stanford University Stanford, CA 94305, USA;

    Department of Mechanical Engineering Stanford University Stanford, CA 94305, USA;

    Department of Materials Science and Engineering Stanford University Stanford, CA 94305, USA;

    Department of Materials Science and Engineering Stanford University Stanford, CA 94305, USA;

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