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In-situ redox cycling behaviour of Ni-BaZr0.85Y0.15O3-delta cermet anodes for Protonic Ceramic Fuel Cells

机译:Ni-BaZr0.85Y0.15O3-δ金属陶瓷阳极的质子陶瓷燃料电池原位氧化还原循环行为

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摘要

The current work investigates the redox behaviour of peak performing Ni-BaZr0.83Y0.15O3-delta (Ni-BZY) cermet anodes for protonic ceramic fuel cells (PCFCs) by electrochemical impedance measurements, scanning electron microscopy (SEM) and X-ray diffraction (XRD). Peak performing PCFC cermet anodes are documented to require much lower porosity levels than those needed in oxide-ion conducting counterparts. The polarisation behaviour of these optimised PCFC anodes is shown to be drastically impaired by redox cycling, with depletions in performance that correspond to around 80% of the original resistance values noted after the first redox cycle. The ohmic resistance (Rohmic) is also shown to be increased due to delamination at the electrode/electrolyte interface, as confirmed by postmortem microstructural analysis. In-situ measurements by environmental scanning electron microscopy (ESEM) reveal that degradation proceeds due to volume expansion of the nickel phase during the re-oxidation stage of redox cycling. The present study reveals degradation to be very fast for peak performing Ni-BZY cermets of low porosity. Hence, methods to improve redox stability can be considered to be essential before such anodes can be implemented in practical devices. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
机译:当前的工作通过电化学阻抗测量,扫描电子显微镜(SEM)和X射线衍射研究用于质子陶瓷燃料电池(PCFC)的峰值性能Ni-BaZr0.83Y0.15O3-δ(Ni-BZY)金属陶瓷阳极的氧化还原行为(XRD)。据记录,具有峰值性能的PCFC金属陶瓷阳极所需要的孔隙度要比氧化物离子导电对等体低得多。这些优化的PCFC阳极的极化行为已显示出受氧化还原循环的严重破坏,其性能下降对应于第一个氧化还原循环后记录的原始电阻值的80%左右。事后显微结构分析证实,由于电极/电解质界面处的分层,欧姆电阻(Rohmic)也增加了。通过环境扫描电子显微镜(ESEM)进行的原位测量表明,在氧化还原循环的再氧化阶段,由于镍相的体积膨胀而导致降解进行。本研究表明,对于低孔隙度的峰值性能Ni-BZY金属陶瓷,降解非常快。因此,在可以在实际装置中实现这种阳极之前,可以认为提高氧化还原稳定性的方法是必不可少的。 Hydrogen Energy Publications,LLC版权所有(C)2014。由Elsevier Ltd.出版。保留所有权利。

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