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Exceptionally Enhanced Electrode Activity of (Pr,Ce)O2−δ‐Based Cathodes for Thin‐Film Solid Oxide Fuel Cells
Advanced Energy Materials ( IF 27.8 ) Pub Date : 2018-03-13 , DOI: 10.1002/aenm.201703647
Han Gil Seo 1 , Yoonseok Choi 1 , WooChul Jung 1
Affiliation  

It is shown that an electrochemically‐driven oxide overcoating substantially improves the performance of metal electrodes in high‐temperature electrochemical applications. As a case study, Pt thin films are overcoated with (Pr,Ce)O2−δ (PCO) by means of a cathodic electrochemical deposition process that produces nanostructured oxide layers with a high specific surface area and uniform metal coverage and then the coated films are examined as an O2‐electrode for thin‐film‐based solid oxide fuel cells. The combination of excellent conductivity, reactivity, and durability of PCO dramatically improves the oxygen reduction reaction rate while maintaining the nanoscale architecture of PCO layers and thus the performance of the PCO‐coated Pt thin‐film electrodes at high temperatures. As a result, with an oxide coating step lasting only 5 min, the electrode resistance is successfully reduced by more than 1000 times at 500 °C in air. These observations provide a new direction for the design of high‐performance electrodes for high‐temperature electrochemical cells.

中文翻译:

(Pr,Ce)O2-δ基阴极对薄膜固体氧化物燃料电池的异常增强的电极活性

结果表明,在高温电化学应用中,电化学驱动的氧化物外涂层可以显着提高金属电极的性能。作为案例研究,铂薄膜被涂覆了一层(PR,铈)O 2- δ(PCO)由产生纳米结构的氧化层具有高的比表面积和均匀的金属覆盖,然后将经涂覆的阴极电化学沉积工艺来影片被视为O 2薄膜型固体氧化物燃料电池的电极。PCO优异的电导率,反应性和耐用性相结合,极大地提高了氧还原反应的速度,同时保持了PCO层的纳米级结构,从而在高温下具有PCO涂层的Pt薄膜电极的性能。结果,通过仅持续5分钟的氧化物涂覆步骤,在空气中于500°C时,电极电阻成功降低了1000倍以上。这些发现为高温电化学电池高性能电极的设计提供了新的方向。
更新日期:2018-03-13
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