LI Yongyong 1, MA Zheng 1, LENG Zhizhong 1, CHEN Xing 1, ZHOU Juan 1, WANG Shaorong 2
(1. Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China; 2. China University of Mining and Technology, Xuzhou 221116, Jiangsu, China)
Abstract: Solid oxide electrolysis cell (SOEC) can be used to directly convert electricity in the form of renewable energy into fuel gases in large scale with high energy efficiency. Its structure is similar to that of solid oxide fuel cell (SOFC), which mainly includes two electrodes and electrolyte. As the area where oxygen is precipitated, oxygen electrode plays an important role in determining the electrochemical performance, stability and life-span of SOEC. Therefore, the development of oxygen electrodes is of great significance in promoting the industrialization of SOEC. At present, the common oxygen electrode materials include perovskite and perovskite-like materials. In this article, the progress in oxygen electrode materials of SOEC was reviewed, covering strategies of electrode stability, development of new oxygen electrode materials and optimization of the material systems. At the same time, the ways to optimize the electrochemical performance and improve the stability of oxygen electrodes were summarized. Finally, the future development of oxygen electrodes was prospected.
Key words: solid oxide electrolysis cell; oxygen electrode; electrochemical performance; stability