甲烷辅助固体氧化物电解池 (SOEC) 是实现高温电解水蒸气高效制氢并联产合成气的核心部件。传统SOEC阳极极化高，长期运行稳定性不足是制约其实用化的瓶颈。开发低极化、高稳定性的电极材料，设计高连通性的阳极成为本领域的关键问题。本项目提出将高电导高稳定性的新型电子导体Ti4O7与氧离子导体Gd0.2Ce0.8O1.9-δ (GDC) 结合，构建具有多级孔隙结构的双相复合SOEC阳极。拟研究和发展Ti4O7/GDC双相多孔中空微球的盐助喷雾热解结合原位碳热还原制备方法。该方法制得的微球中空且球壳多孔，具有独特的两级孔隙结构，连通性高，可有效降低极化。以微观形貌结构观察和SOEC性能测试为基础，探索制备条件工艺—微球组分结构—电极性能之间的关系，发展低极化、高稳定性的阳极材料和结构，研究Ti4O7/GDC复合氧化物阳极电极过程机理，为甲烷辅助的SOEC技术发展提供科学基础和技术支持。

Methane-assisted solid oxide electrolysis cell (SOEC) is the key component of high temperature steam electrolysis (HTSE) technology for highly efficient hydrogen and syngas co-production. However, the traditional anode suffers from two major disadvantages: high polarization and long-term performance degradation. Exploiting low polarization, long-life anode materials and designing highly connective anode structure become the important issues in this field. In this project, we propose a novel methane-assisted SOEC anode of Ti4O7/ GDC dual-phase composite oxide with hierarchical pore structure. This project is intended to investigate the salt-assisted spray pyrolysis companied with in-situ carbothermal reduction process for Ti4O7/ GDC dual-phase hollow microsphere preparation. This process creates a unique graded structure of with porous shell which lead in high connectivity, and thus reduces the concentration and activation polarization. This project will exploit new material and anode structure, and study the effect of pore structures to SOEC anode polarizations based on morphology observation and SOEC performance measurement, investigate the correlations between preparing-process parameters, microstructure and the electrolysis cell performances, and to develop SOEC anode with low polarization and high stability. Hopefully, the knowledge and techniques developed by this project will provide scientific basis and technical support for the development of methane-assisted SOEC technology.