等离子喷涂制备固体氧化物燃料电池电解质涂层研究进展

Research Status of Preparation of Solid Oxide Fuel Cell Electrolyte by Plasma Spray

等离子喷涂作为一种高性价比的涂层沉积工艺,在固体氧化物燃料电池(SOFC)电解质制备方面比传统方式更灵活、高效,尤其在大面积电解质快速成形上,表现出良好的发展潜力。介绍SOFC的工作原理和研究趋势,综述电解质材料及等离子喷涂制备工艺的研究进展,指明等离子喷涂制备SOFC电解质涂层的发展方向。研究表明:氧化钇、氧化钪稳定的氧化锆是目前商业化应用最广泛的电解质材料,其他如氧化铈基及氧化铋基电解质还须解决还原气氛下价态变化问题,而镧锶镓镁氧化物和硅酸盐电解质则需解决成分和结构稳定性问题。在制备方面,传统湿化学法的高温烧结过程难以制备金属支撑型SOFC,磁控溅射和气相沉积等镀膜技术成本高、效率低,不适合电解质大规模生产。而等离子喷涂技术具有沉积效率高,对基体热输入小,可灵活调控涂层微观结构等优势。等离子喷涂SOFC电解质还存在较大探索空间,基于前期相关工作为后续中低温电解质制备及优化提供思路,随着电解质粉末成本下降及喷涂设备迭代升级,等离子喷涂技术有望在未来成为大规模高效制备SOFC电解质涂层的重要手段。

Plasma spraying has high potential for growth in solid oxide fuel cell(SOFC)electrolyte preparation as a cost-effective coating deposition procedure which is more versatile and efficient than conventional methods,notably for quick fabrication of large-scale electrolyte.This paper discusses the working principle and research trends of SOFCs,emphasizes investigate accomplishments in electrolyte materials and the plasma spraying preparation method,and points to the future development direction of SOFC electrolyte coating deposited by plasma spraying.The most widely used electrolyte materials for commercial applications are yttrium oxide and scandium oxide stabilized zirconium oxide,while other electrolytes such as cerium oxide and bismuth oxide still need to solve the problem of valence change under reducing atmosphere and lanthanum strontium gallium oxide and silicate electrolytes lack of composition and structural stability.In terms of preparation,the traditional wet chemical method of high-temperature sintering is difficult to use to make metal-supported SOFCs,and coating technologies like magnetron sputtering and vapor deposition are expensive and inefficient,making them unsuitable for mass production of electrolytes.Plasma spraying technique provides the benefits of high deposition efficiency,minimal substrate heat input,and flexible coating microstructure adjustment.With the decline in the cost of electrolyte powder and iterative upgrading of spraying equipment,plasma spraying technology is expected to become an important means of large-scale and efficient preparation of SOFC electrolyte coating in the future,based on preliminary work to provide ideas for the subsequent preparation and optimization of low and medium temperature electrolyte.With the decline in the cost of electrolyte powder and iterative upgrading of spraying equipment,plasma spraying technology is expected to become an important means of large-scale.