In situ study of anode reaction in intermediate temperature solid oxide fuel cells
In situ study of anode reaction in intermediate temperature solid oxide fuel cells
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中温固体氧化物燃料电池阳极反应的原位研究
DOI：
10.1017/s1431927613004467
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发表时间：
2013
影响因子：
2.8
通讯作者：
R. E. Dunin-Borkowski
中科院分区：
文献类型：
--
作者：
A. H. Tavabi;S. Muto;T. Tanji;R. E. Dunin-Borkowski
固体氧化物燃料电池（SOFC）作为一种新型清洁能源，从大型固定装置到汽车应用电源，越来越受到人们的关注。然而，这些装置的高温运行状态被认为是 SOFC 行业的主要限制，这导致了广泛商业化的严重限制，例如寿命短、材料降解和密封成本高。 SOFC 阳极的析氧反应 (OER) 是电池运行中降低工作温度的关键部分。氧化铈基金属陶瓷是最有前途的中温固体氧化物燃料电池（IT-SOFC）阳极材料的候选者。在适当的电解质环境下，通过脉冲激光沉积（PLD）方法在不同结晶度和电解质材料中氧空位数量的Si（100）基板上制备了作为带有Ni电极和20摩尔％氧化钆掺杂二氧化铈（GDC20）电解质的SOFC阳极的体半电池和电极材料。随后，通过微采样聚焦离子束 (FIB) 技术从半电池制备 TEM 样品，并将其安装在 Mo FIB 网格上。通过X射线衍射（XRD）和纳米电子束衍射（NBD）对电解质的微观结构特征进行了表征。应用分析 TEM 方法研究了阳极反应 (OER) 期间电池的反应机理和微观结构演变。通过 JEM2100 在不同温度下获得原位电子能量损失谱 (EELS)。原始细胞和操作细胞的异位 EDS 元素图和 HRTEM 图像通过 ARM200F [JEOL] 获得。使用改进的场发射 HF-2000 [Hitachi] 进行电子全息观测。
Solid oxide fuel cells (SOFC) are attracting increasing attention as a new and clean source of energy from large-scale stationary to power supply for autos applications. However, high temperatures operation regime of these devices is considered as the main limitation in SOFCs industry, which leads to serious restrictions such as short lifetime, material degradation, and high sealing cost for widespread commercialisation. Oxygen evolution reaction (OER) at SOFCs’ anode is a critical section in the cell operation to reduce the working temperatures. Ceria-based cermets are of most promising candidates as the high performance anode materials for intermediate temperature SOFC (IT-SOFC).Bulk half cells as anodes for SOFCs with a Ni electrode and a 20 molar% gadolinia doped ceria (GDC20) electrolyte were prepared by a pulsed laser deposition (PLD) method at different levels of crystallinity and the number of oxygen vacancies in the electrolyte material on a Si (100) substrate at appropriate environments for the electrolyte and electrode materials. Subsequently, TEM specimens were prepared from the half cells by a micro-sampling focused ion beam (FIB) technique and mounted on Mo FIB grids. The microstructural features of the electrolytes were characterized by X-ray diffraction (XRD) and nano electron beam diffraction (NBD). The reaction mechanism and the microstructural evolution of the cells during the anode reaction, OER, were studied applying analytical TEM approaches. In situ electron energy loss spectra (EELS) were acquired by a JEM2100 at different temperatures. Ex situ EDS elemental maps and HRTEM images of the raw and operated cells were obtained by an ARM200F [JEOL]. Electron holography observations were conducted using a modified field emission HF-2000 [Hitachi].