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Impact of Surface Chemistry on the Electrochemical Performance of Perovskite Cathodes

机译：表面化学对钙钛矿阴极电化学性能的影响

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摘要

Surface chemistry and reactivity of electrodes in electrochemical devices play a key role for electrochemical performance and cell durability. In this work, we use spatially resolved scanning photoelectron microscopy and electrochemical measurements to study in situ the surface chemistry of perovskite catalysts in SOFC cathode model cells during high temperature operation at 500-550℃ in oxygen containing environment (10~(-6)mbar) at OCV or under oxygen flux. Oxygen ion flux and electric field cause dynamic changes of catalyst and electrolyte surface chemistry, including redox reaction, surface segregation and long range surface diffusion. In (La,Sr)Mn_(1+x)O_(3-δ)(LSM) cathodes, oxidizing environment was found to promote transition metal-rich cathode surface termination with high surface oxygen content and a variety of oxygen surface species, while reducing environment produced surface segregation of strontium and low level of surface oxygen. The electrochemical response provided the rate-determining reaction steps of the operating model cell and could directly be compared to the spectroscopic observations.
机译：电化学装置中电极的表面化学和反应性对于电化学性能和电池耐久性起着关键作用。在这项工作中，我们使用空间分辨扫描光电子显微镜和电化学测量方法来研究含氧环境（10〜（-6）mbar）中在500-550℃高温运行期间SOFC阴极模型电池中钙钛矿催化剂的表面化学性质。 ）在OCV或氧气通量下。氧离子通量和电场引起催化剂和电解质表面化学性质的动态变化，包括氧化还原反应，表面偏析和远距离表面扩散。在（La，Sr）Mn_（1 + x）O_（3-δ）（LSM）阴极中，发现氧化环境可促进富含过渡金属的阴极表面终止，具有高表面氧含量和多种氧表面物种，而还原环境会导致锶的表面偏析和表面氧含量低。电化学反应提供了操作模型电池的决定速率的反应步骤，可以直接与光谱观察结果进行比较。

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  • 会议地点 Orlando FL(US)
  • 作者

    M. Backhaus-Ricoult; K. Work; K. Adib; L. Gregoratti; M. Amati;

  • 作者单位

    Department of Crystalline Materials Research, Corning Incorporated, Corning, New York 14831, USA;

    Department of Crystalline Materials Research, Corning Incorporated, Corning, New York 14831, USA;

    Department of Crystalline Materials Research, Corning Incorporated, Corning, New York 14831, USA;

    Synchrotrone ELETTRA, Basovizza, Italy;

    Synchrotrone ELETTRA, Basovizza, Italy;

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