Investigation on microstructures of NiO–YSZ composite and Ni–YSZ cermet for SOFCs
Investigation on microstructures of NiO–YSZ composite and Ni–YSZ cermet for SOFCs
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DOI：
10.1016/j.ijhydene.2010.04.156
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发表时间：
2010-09
影响因子：
7.2
通讯作者：
Tahereh Talebi;M. Sarrafi;M. Haji;B. Raissi;A. Maghsoudipour
中科院分区：
文献类型：
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作者：
Tahereh Talebi;M. Sarrafi;M. Haji;B. Raissi;A. Maghsoudipour
NiO-YSZ复合材料和Ni-YSZ陶瓷成功应用于固体氧化物燃料电池。这些复合材料必须有足够的孔隙度和适当的微观结构来传递燃料气体。在本研究中，球磨是一种简单、经济的混合原料的方法。利用SEM的Map模式对NiO-YSZ复合材料的均匀性进行了检测。在可控气氛下对NiO-YSZ复合材料进行高温还原制备Ni-YSZ陶瓷。用XRD研究了阳极相的变化，用SEM观察了复合材料的微观结构和孔隙率。研究了温度和成孔量等有效参数对NiO-YSZ复合材料和Ni-YSZ陶瓷的开孔率、容重、电导率和电化学阻抗的影响。采用EPD在不同开孔量的NiO-YSZ复合材料上沉积一层YSZ薄膜作为电解液，通过电化学阻抗研究其对半电池性能的影响。
NiO–YSZ composites and Ni–YSZ cermets were successfully performed for solid oxide fuel cell applications. These composites must have enough porosity and appropriate microstructure for transferring the fuel gases. In this study, ball-milling was used as a simple, cost-effective method for the purpose of mixing the raw materials. The homogeneity of NiO–YSZ composites was examined by Map mode of SEM. NiO–YSZ composites were reduced at the high temperature under the controlled atmosphere to fabricate Ni–YSZ cermet. Variations in the anode phases were investigated by XRD and microstructure and porosity of composites were observed by SEM. Effective parameters like temperatures and the amount of pore former were investigated on open porosity, bulk density, electrical conductivity as well as electrochemical impedance of NiO–YSZ composites and Ni–YSZ cermet. A thin layer of YSZ was deposited by EPD as an electrolyte on NiO–YSZ composites which had various amount of open porosity, to study its effect on the performance of semi-cells by electrochemical impedance.