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首页> 外文会议>International conference and exposition on advanced ceramics and composites >HIGH-TEMPERATURE LONG-TERM STABLE ORDERED MESOPOROUS ELECTRODES FOR IT-SOFC
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HIGH-TEMPERATURE LONG-TERM STABLE ORDERED MESOPOROUS ELECTRODES FOR IT-SOFC

机译：用于IT-SOFC的高温长期稳定有序介孔电极

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Ordered mesoporous metal oxides were prepared from a silica hard template. Two stabilization approaches for preparing high temperature ordered mesoporous structures were presented and their functionality as electrodes for intermediate temperature solid oxide fuel cells (IT-SOFCs) was proven. Firstly, nickel based mesoporous cermets were synthesized and characterized by using a scaffolding approach. A compact unit is synthesized by a multi-impregnation step. The nano-structure is kept stable up to 1200 °C (electrode-electrolyte attachment temperature) due to the intimate connection between the ceramic and the metal networks. Moreover, virtually no degradation of the microstructure and the electrochemical performance was demonstrated for the cermet after 200 h of test at 800 °C in a humidified Ar-5 % H_2 atmosphere. A second thermal stabilization approach was performed for open 3D mesoporous structures, by the partial crystallization of the mesoporous oxide inside the template, reaching the so-called self-limited grain growth regime. The self-supported replicas maintain the periodic mesoporous structure and a high surface area up to 1000 °C. SDC scaffolds for symmetrical cells were fabricated. Long-term impedance measurements performed with SSC-infiltrated on the SDC scaffolds as symmetrical cells revealed an area specific resistance (ASR) improvement by ～ 45 %, up to an ASR value of 0.07 Ω cm~2 during the first 200 hours. The proposed methodologies represent a step forward towards the implementation of mesostructures in applications where high thermal stability is required such as solid oxide fuel/electrolysis cells, gas separation membranes or high temperature catalysis.
机译：由二氧化硅硬模板制备有序的介孔金属氧化物。提出了两种制备高温有序介孔结构的稳定方法，并证明了中间温度固体氧化物燃料电池（IT-SOFC）的电极的功能。首先，通过使用脚手架方法合成镍的介孔金属晶体，其特征在于。通过多浸渍步骤合成紧凑的单元。由于陶瓷和金属网络之间的紧密连接，纳米结构保持稳定至1200℃（电极电解质连接温度）。此外，在800℃下在加湿的Ar-5％H_2气氛中，几乎没有显微化和电化学性能的降解，在800℃下试验到800℃下的金属陶瓷。通过模板内部结晶的介孔氧化物的部分结晶来进行第二热稳定方法，通过模板内的部分结晶，达到所谓的自限粒生长状态。自支持的复制品维持周期性介孔结构，高达1000℃的高表面积。制造用于对称电池的SDC支架。 SSC浸润在SSC支架上进行的长期阻抗测量，因为对称电池显示出面积的特异性电阻（ASR）改善〜45％，在前200小时内为0.07Ωcm〜2的ASR值。所提出的方法代表了在需要高热稳定性的应用中实现型腹腔结构的前进，例如固体氧化物燃料/电解细胞，气体分离膜或高温催化。

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