In-situ photoelectron microspectroscopy during the operation of a single-chamber SOFC

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• 作者：Benedetto Bozzini ; Matteo Amati ; Luca Gregoratti ; Claudio Mele ; Majid Kazemian Abyaneh ; Mauro Prasciolu ; Maya Kiskinova
• 关键词：SOFC ; Single-chamber SOFC ; Hydrocarbon-fuelled SOFC ; SPEM ; XPS ; X-ray microscopy
• 刊名：Electrochemistry Communications
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：24
• 期：Complete
• 页码：104-107
• 全文大小：631 K

文摘

This paper reports the first in-situ synchrotron-based scanning photoelectron microscopy study of an operating YSZ-supported single-chamber SOFC with Au-MnO₂ composite cathode and NiO anode, fed with 10^? 5 mbar 1:1 mixture of CH₄ fuel and O₂ at 650 ¡ãC. We employed a YSZ-supported cell with Au-MnO₂ composite cathode and NiO anode. The chemical imaging and micro-XPS results were complemented with simultaneous electrochemical measurements, open circuit potential, potentiostatic and impedance spectrometry. The cell was operated under two conditions: (i) with fully oxidized electrodes and (ii) after in-situ reductive activation of the anode. The current delivered by the cell after in-situ reduction was about one order of magnitude higher. The chemical states of Ni and Mn were affected by the in-situ reduction process but they were not modified by the fuel-cell operation. Notwithstanding the absence of chemical state transformations of the electrode materials during the prolonged fuel-cell operation, cell aging brings about morphological change, accompanied by a decrease of the extracted current.